Full-automatic high-quality paper pulp molding microwave drying forming equipment

Abstract

The invention provides full-automatic high-quality paper pulp molding microwave drying forming equipment which comprises a microwave drying forming part, a suction filtration forming part and a cooling circulation system. The full-automatic high-quality paper pulp molding microwave drying forming equipment has the following beneficial effects that a wave heat source can be turned on and turned off according to actual requirements; in a traditional electric heating mode, a heat source needs to be started all the time to ensure that a mold is in a high-temperature state, and the heat conduction direction is opposite to the water vapor transmission direction, so that the outer part of a paper-plastic product is dried firstly, and internal moisture diffuses to the surface and then is dried under the humidity and temperature gradient, the drying speed is slower, and places with high moisture content are dried slowly. The heat conduction direction of microwave drying is the same as the transfer direction of water vapor, the temperature is increased inside and outside at the same time, and based on the drying characteristic that microwaves can polarize water molecules, the higher the water content is, the higher the temperature is, the higher the drying rate is, the material can be heated more uniformly, and the production period can be greatly shortened.

Description

Technical Field

[0001] The invention discloses a fully automatic high-quality paper pulp molding microwave drying and forming device, belonging to the technical field of paper pulp molding microwave drying. Background Art

[0002] Chinese patent CN205000197U discloses a microwave drying and forming device for a wet pulp molding process, which includes an upper fixed mold, a lower fixed mold, an upper mold, a lower mold, a microwave generator, and a wet blank. The wet blank is located between the upper mold and the lower mold, and the microwave generator is disposed in the upper mold and / or the lower mold to emit microwaves to the interior of the upper mold and the lower mold, so that the water molecules contained in the wet blank vibrate and generate heat through friction, thereby drying and forming the wet blank to obtain a wet pulp molded product, and experiments have proved that microwave drying technology can effectively improve the efficiency of pulp molding production. However, there is still a certain distance between the microwave drying and forming device for the wet pulp molding process described in the above technical solution and the actual application of microwave drying technology in pulp molding production;

[0003] The drying process of pulp molded products can be considered as a continuous dehydration process, which mainly consists of two parts: suction dehydration and hot pressing dehydration. Among them, the hot pressing dehydration process is the core part of the entire pulp molded product process. It applies appropriate temperature and pressure to the pulp molded product through the thermoforming mold, so that the water in the pulp is removed by evaporation and a three-dimensional pulp molded product is obtained. The traditional thermoforming mold uses the heat generated by the heating rod in the heating plate under the mold when it is powered on, and transfers the heat to the heating plate, the mold base, the mold core in turn by heat conduction, and finally reaches the upper surface of the mold for drying the pulp molded product. However, traditional thermoforming molds have problems such as slow mold heating rate due to the long heat transfer distance (at least 45mm), uneven heat transfer distance resulting in uneven temperature distribution on the mold surface, and heat loss caused by heat conduction, convection, radiation and other factors between the mold heating system and the air and base, which seriously affect the production energy consumption and efficiency of pulp molded products. Therefore, it is very necessary to seek more efficient pulp molding heating methods and equipment for the development and improvement of the pulp molding industry. Therefore, there is an urgent need for a fully automatic high-quality pulp molding microwave drying and molding equipment to solve the above problems. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a fully automatic high-quality pulp molding microwave drying and forming equipment, comprising: a microwave drying and forming part, a suction and filtration forming part, a pulp molding transfer part and a cooling circulation system, wherein the microwave drying and forming part, the suction and filtration forming part, the pulp molding transfer part and the slide are arranged between the upper shell and the lower shell;

[0005] The lower end of the microwave drying forming part is provided with a slide for providing movable support to the lower end thereof, the upper end of the pulp microwave drying forming part is provided with a microwave drying end hydraulic system for providing hydraulic pressure to the interior thereof and is arranged at the center of the upper shell, and the cooling circulation system is arranged around the hydraulic system of the transfer part and has a direct cooling relationship with the microwave drying forming part;

[0006] The microwave drying forming part includes, from bottom to top according to the installation method, a hot pressing lower mold base, a hot pressing lower mold fixing plate, a microwave hot pressing lower mold, a microwave hot pressing upper mold, a waveguide plate, a microwave heating system, a lifting fixing plate and a microwave drying end hydraulic system.

[0007] Compared with the traditional technology, the present invention has the following beneficial effects: the microwave heat source can be turned on and off according to actual needs, while the traditional electric heating method needs to keep the heat source on to ensure that the mold is in a high temperature state. The heat conduction direction is opposite to the water vapor transfer direction, which causes the outside of the paper plastic product to dry first. Under the humidity and temperature gradient, the internal moisture diffuses to the surface and then dries, so the drying speed is slower, and the places with high moisture content dry slower. The heat conduction direction of microwave drying is the same as the water vapor transfer direction, and the inside and outside are heated together. Based on the drying characteristics of microwaves that can polarize water molecules, this will cause the temperature to be higher in places with higher moisture content, and the drying rate will be faster, so the material can be heated more evenly and the production cycle can be greatly shortened.

[0008] As a preferred embodiment, the suction filter forming part includes a slurry tank, an air blower, a vacuum rotating triangular bracket, a slurry suction mold fixing plate, a slurry suction mold, a rotating motor, a lifting plate, a vacuum water filter pipe, an extrusion mold and a suction filter end hydraulic system from bottom to top according to the installation method. A partition is provided in the slurry tank, and they are connected to the bottom of the tank by welding. The slurry tank is divided into two cavities, a slurry tank and a reflux tank. The reflux tank in the slurry tank 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 is provided with a reflux valve and an external reflux pipe leading to the slurry tank;

[0009] The slurry pool in the slurry tank is used to provide the raw material pulp required for the production of fully automatic fine pulp molding microwave drying and forming equipment. The side wall of the slurry pool is provided with a slurry inlet valve and a drain valve for providing and removing slurry, and the two are connected to the external pipeline. A large number of small holes with a diameter of mm are opened on the horizontal surface of the air blast pipe and are evenly distributed on the surface of the external pipeline. The size is smaller than the bottom area of ​​the slurry pool and is fixed to the bottom of the pool by U-shaped screws. The vacuum rotating triangular bracket is a regular triangular prism frame structure. One side of the regular triangular prism structure is the working surface, and the other two sides are regarded as the supporting surfaces of the working surface. The front center of the working surface of the vacuum rotating triangular bracket sinks inward by 10mm in a positive drafting manner and is connected to a semi-cylindrical hollow cavity provided on the back of the working surface. A cylindrical header is provided at the top of the vertical line diagonally opposite the working surface of the vacuum rotating triangular bracket. The side of the cylindrical header is tangent to the two supporting surfaces, and the angle is rounded at the same time. The rounding radius is the radius of the cylindrical header plus the thickness of the supporting surface.

[0010] The semi-cylindrical hollow cavity on the back of the working surface of the vacuum rotating triangle bracket is connected to the cylindrical header tangent to the supporting surface through steel pipes distributed at equal intervals. The axis of the cylindrical header on both sides of the vacuum rotating triangle bracket extends outward with a certain distance of hollow shafts, which are connected to the bearings in the bearing brackets at both ends of the lifting plate. The left end of the hollow shaft is connected to the vacuum tank through a vacuum water filter pipe to form a vacuum suction filter molding part, and the right end of the hollow shaft is connected to the rotating motor through a coupling to realize the flipping of the vacuum rotating triangle bracket.

[0011] The rotating motor is fixed to the extension plate of the lifting plate by screws, the extrusion mold in the suction filter molding part is fixed to the back of the upper shell by screws, and is located in the center of the hydraulic cylinder in the hydraulic system of the molding part. The slurry suction mold, the slurry suction mold fixing plate and the vacuum rotating triangular bracket in the suction filter molding part are connected from top to bottom in sequence by screws and sealing rings, and finally connected to the vacuum water filter pipe.

[0012] A guide column is provided at the lower end of the suction filter end hydraulic system and is located between the upper shell and the lower shell. The suction filter end hydraulic system is composed of a hydraulic cylinder group and is fixed to the left end of the upper shell by fastening screws. The lifting plate is a rectangular steel plate. Both ends of the steel plate are provided with round holes with a diameter smaller than the diameter of the piston rod, and a bearing bracket is provided at the center. The hydraulic cylinder group of the suction filter end hydraulic system extends a piston rod toward the lower shell, and the piston rod is connected to an independent lifting plate by a threaded flange and fastening screws.

[0013] As a preferred embodiment, the microwave drying forming part includes, from bottom to top, a hot pressing lower mold base, a hot pressing lower mold fixing plate, a microwave hot pressing lower mold, a microwave hot pressing upper mold, a waveguide plate, a microwave heating system, a lifting fixing plate and a microwave drying end hydraulic system according to the installation method. The microwave heating system consists of a protective isolation cover and a microwave emission system. The protective isolation cover is a cast iron frame, and the frame is provided with isolation plates welded horizontally and vertically to evenly divide the entire protective isolation cover into areas for independent and distributed installation of the microwave emission system.

[0014] The isolation plate can provide protective support when the protective isolation cover is under pressure, and a number of groups of rectangular holes of the same size and specification are evenly distributed on the isolation plate for interconnection between various areas, and provide channels for the later microwave emission system circuit, pipeline heat exchanger cold water pipe and heat exchanger hot water pipe. The top cover surface of the protective isolation cover is evenly distributed with a circular microwave emission port for accommodating the antenna;

[0015] The microwave transmitting system is composed of six parts, namely, a heat exchanger cold water pipe, a heat exchanger hot water pipe, a heat exchanger, a filter power supply, a magnetron and an antenna. The magnetron 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 is converted into microwave energy. The heat exchanger is used to absorb the heat generated during the operation of the magnetron. The heat exchanger cold water pipe and the heat exchanger hot water pipe provided on the side of the heat exchanger are used to realize the circulation of the cooling medium in the heat exchanger.

[0016] The waveguide plate is a rectangular aluminum plate, the front side of which contacts the cover surface of the protective isolation cover, and the back side contacts the bottom surface of the microwave hot pressing upper mold. A group of waveguide channels are arranged inside the waveguide plate for conducting microwaves, that is, microwaves generated by the microwave transmitting system are introduced into the microwave hot pressing upper mold according to a certain route. A rectangular microwave receiving hole is evenly distributed on the contact surface between the waveguide plate and the protective isolation cover;

[0017] A rectangular microwave release hole is centrally arranged at the corresponding position of the contact surface between the waveguide plate and the microwave hot pressing upper mold, and a circular microwave release hole is respectively arranged at the non-contact positions on both sides of the contact surface corresponding to the position. The total number of holes is used to connect with the microwave hot pressing upper mold. The microwave receiving holes and the microwave release holes in the waveguide plate correspond one to one through a waveguide channel, thereby realizing the effect of uniform and directional wave guiding.

[0018] As a preferred embodiment, the microwave hot pressing upper mold is composed of four parts: a front support shell, a core support shell, a rear support shell and a core, wherein the materials of the front support shell, the core support shell and the rear support shell are aluminum, and the material of the core is polytetrafluoroethylene, the front support shell and the rear support shell have the same structure and are similar to the traditional hot pressing upper mold structure, a guide column groove is provided in the center of the support shell for installing the guide column, and screw grooves are provided on both sides of the guide column groove, and the microwave hot pressing upper mold is fixed to the waveguide plate by long screws;

[0019] The sides of the front support shell and the rear support shell are evenly distributed with a group of waveguide channels and circular microwave release holes connected to the waveguide plate through the waveguide tube, and the uniformity of microwave distribution in the mold during drying is improved. The sides of the front support shell and the rear support shell are provided with a group of threaded holes, and the side wall fastening screws are arranged to realize the connection between the front support shell, the rear support shell and the core support shell;

[0020] The mold core support shell is a rectangular trough structure, that is, it is composed of a side wall and a bottom plate. The left and right side walls of the mold core support shell trough are similar to the front support shell and the rear support shell, and are used to position and fix the mold, that is, the center of the left and right side walls is provided with a guide column groove for installing the guide column, and the two sides of the guide column groove are provided with penetrating screw grooves, and the microwave hot pressing upper mold is fixed to the waveguide plate by long screws;

[0021] The front and rear side walls of the core support shell are provided with waveguide grooves and transmission windows are evenly distributed at the bottom of the waveguide grooves, and their positions correspond one-to-one to the groups of waveguide channels in the front support shell and the rear support shell. The bottom plate of the core support shell is provided with transmission windows, and their positions correspond one-to-one to the rectangular microwave release holes in the middle of the waveguide plate. The microwave drying end hydraulic system is composed of a group of hydraulic cylinders and a guide column and is fixed to the center of the upper shell by fastening screws.

[0022] The lifting and fixing plate is connected to the hydraulic cylinder piston rod and the root guide column of the microwave drying end hydraulic system through a threaded flange and fastening screws. The microwave hot pressing upper mold, waveguide plate, and microwave heating system are installed on the lifting and fixing plate in sequence through screws. The piston rod is used to realize the vertical movement of components such as the microwave hot pressing upper mold, waveguide plate, and microwave heating system, and the guide column is used to realize the horizontal positioning of components such as the microwave hot pressing upper mold, waveguide plate, and microwave heating system.

[0023] As a preferred embodiment, the hot pressing lower die base is a rectangular cast iron box with a hollow interior and a support beam provided therein for strengthening the support force of the working surface of the box. The side walls of the box are strengthened by arranging reinforcing ribs for strengthening the support force of the working surface. The bottom surface of the hot pressing lower die base is provided with a vacuum tube joint and a cooling water drain pipe. Among them, the vacuum tube joint is used to connect to the vacuum suction system and provide vacuum suction force during the operation of the microwave hot pressing die, while the cooling water drain pipe is used to connect to the sewage tank and discharge the water vapor cooled on the hot pressing lower die base under the action of the vacuum suction system during the operation of the microwave hot pressing die;

[0024] The working surface of the hot pressing lower die base is provided with vacuum holes and threaded holes, which are used to connect to the vacuum holes and threaded holes in the hot pressing lower die fixing plate and the microwave hot pressing die respectively, so as to connect the vacuum pumping system and fasten the die. The surface of the microwave hot pressing die is attached with a metal mesh with smaller pores. When the vacuum suction system and the microwave heating system are running simultaneously, the metal mesh can filter microwaves in the vacuum suction air to prevent microwave leakage.

[0025] As a preferred embodiment, the cooling circulation system includes a cold water inlet pipe, a hot water outlet pipe, a radiator, a cold water tank, a hot water tank, a water pipe and a circulation water pump in sequence from left to right according to the installation method. The cold water tank and the hot water tank are cylindrical stainless steel tanks with three feet provided at the bottom for support and fixed by screws. The top of the stainless steel tank is provided with a water inlet valve, and the bottom is provided with a water outlet valve. The cold water tank is fixed on the right side of the upper shell, close to the rear end of the transfer part hydraulic system, and the hot water tank is fixed on the right side of the upper shell, close to the front end of the transfer part hydraulic system. The cold water inlet pipe is externally connected to the water outlet valve of the cold water tank, the hot water outlet pipe is externally connected to the water inlet valve of the hot water tank, and the circulation water pump is connected in series between the two. The radiator is a water-cooled radiator, and there are a water inlet and a water outlet on the left and right sides of the top of the radiator respectively. The radiator is connected in parallel with the cold water tank and the hot water tank through water pipes, and the cold water tank and the hot water tank are connected in series through water pipes.

[0026] As a preferred embodiment, the sliding table includes a frame, rolling bearings, a ball screw shaft, a coupling, a servo motor, a guide rail, a slider, a transfer plate and a lead screw nut in sequence from left to right according to the installation method. The frame is composed of a bearing-type aluminum alloy frame profile to form a cross beam and a main beam, and is fastened to the center position of the lower shell in a "day" shape from left to right by screws and angle codes. The highest surface of the frame is at the same horizontal position as the highest surface of the lower shell. The two main beams of the frame pass through the suction filtration forming part, the microwave drying forming part and the pulp molding transfer part from left to right in sequence, and are fixed on both sides of the slurry tank by screws and angle codes;

[0027] The crossbeam at the center of the "day"-shaped frame of the frame is located at the center position of the suction filtration forming part and the microwave drying forming part, and the other two crossbeams are respectively located at the left end of the microwave drying forming part and the right end of the pulp molding transfer part. A bearing bracket is provided at the center position on the right side of the crossbeam of the frame located in the microwave drying forming part and is fixed by screws and angle codes. The rolling bearing is fixed inside the bearing bracket and the overall position is higher than the top surface of the crossbeam. A bearing bracket is also provided at the center position on the left side of the crossbeam of the frame located in the pulp molding transfer part and is fixed by screws and angle codes. The rolling bearing is fixed inside the bearing bracket and the overall position is higher than the top surface of the crossbeam.

[0028] There are two guide rails in total, which sequentially penetrate through the suction filtration forming part, the microwave drying forming part, and the pulp molding transfer part from left to right, and are fixed to the two main beams of the frame by screws through the threaded holes in the center of the guide rails. Each guide rail is equipped with a set of rectangular sliders, and the transfer plate is stably fixed to the set of sliders by screws to realize the movement of the transfer plate between each working station. The servo motor is fixed to the center position on the right side of the crossbeam of the pulp molding transfer part by a motor fixing bracket and screws. The axis of the servo motor is concentric with the rolling bearing inside the bearing bracket at the center position of the crossbeams of the microwave drying forming part and the pulp molding transfer part and is at the same height.

[0029] The left and right ends of the ball screw shaft near the screw part are respectively fixed inside the rolling bearings on the bearing brackets at the center positions of the crossbeams of the microwave drying forming part and the pulp molding transfer part. The ball screw shaft is connected in series with the servo motor through a coupling to realize transmission. The screw nut is of a cuboid structure, with a thread provided at the center of the cuboid, and realizes movement and rotation on the ball screw shaft. Threaded holes are provided on the rectangular plane of the screw nut, and the transfer plate is connected to the screw nut by screws.

[0030] The micro-pulp transfer part sequentially includes a transfer mold, a liftable fixed plate, and a transfer part hydraulic system from bottom to top according to the installation method. The transfer part hydraulic system is composed of a set of hydraulic cylinders and four guide columns and is fixed to the right end of the upper shell by fastening screws. The liftable fixed plate is externally connected to a vacuum system, and a large number of air holes and threaded mounting holes are left on the plate surface. The transfer mold is provided with a circle of air holes penetrating the entire mold. When the transfer mold is fixed to the liftable fixed plate by screws, the externally connected vacuum system of the liftable fixed plate is connected to the air holes penetrating the mold in the transfer mold.

[0031] When the external vacuum is negative pressure, suction force is generated on the air holes of the transfer mold; when the external vacuum is positive pressure, repulsive force is generated on the air holes of the transfer mold. The liftable fixed plate is connected to the piston rod of the hydraulic cylinder and the four guide columns of the transfer part hydraulic system through threaded flanges and fastening screws. The piston rod is used to realize the vertical movement of the transfer mold, and the guide columns are used to realize the horizontal positioning of the transfer mold.

[0032] After adopting the above technical scheme, the beneficial effects of the present invention are as follows: by turning on the microwave heating system, the microwave generated by the microwave heating system enters the microwave metal cavity formed by the microwave hot pressing lower mold and the microwave hot pressing upper mold through the waveguide plate, the waveguide channel, the waveguide tube and the transmission window, and dries and re-shapes the preliminarily shaped wet paper blank;

[0033] By using the air blowing tube to instantly inject a large amount of air and diffuse it into the slurry pool through the small holes evenly distributed on the surface of the tube, the pulp is caused to boil and the slurry is mixed evenly, thus ensuring the stability of the production of the fully automatic high-quality pulp molding microwave drying and forming equipment;

[0034] By using the hydraulic system of the suction and filtration forming part to extend the piston rod, the vacuum rotating triangular bracket and the slurry suction mold fixed on the lifting plate are driven downward so that the slurry suction mold is immersed in the pulp in the slurry tank, and the vacuum water filter pipe opens the vacuum so that the slurry suction mold starts to absorb the slurry and forms an original wet paper blank on the slurry suction mold, thus completing a water filtering process;

[0035] A microwave metal cavity is formed by a microwave hot pressing lower mold and a microwave hot pressing upper mold, and the preliminarily shaped wet paper blank is dried and reshaped. The water vapor generated during the forming process passes through the microwave hot pressing lower mold, the hot pressing lower mold fixing plate and the hot pressing lower mold base in sequence under the action of vacuum suction force, and is finally discharged through a vacuum pipe joint and a cooling water drain pipe;

[0036] The piston rod of the hydraulic cylinder in the hydraulic system of the transfer part is extended to close the transfer mold with the microwave hot pressing lower mold transferred to the pulp molding transfer part through the slide, and then the external vacuum system of the lifting and lowering fixed plate is set to negative pressure, and the air holes on the transfer mold generate suction to adsorb the microwave-dried pulp molded product on the microwave hot pressing lower mold to the transfer mold, and the piston rod of the hydraulic cylinder in the hydraulic system of the transfer part is shortened to separate the pulp molded product from the microwave hot pressing lower mold, thereby completing the workstation transfer of the product;

[0037] The servo motor is used to drive the ball screw shaft to generate positive and negative torque by rotating forward and reverse, so that the screw nut mounted on the ball screw shaft generates thrust and tension, and drives the transfer plate to move left and right on the guide rail between the suction filtration molding section, the microwave drying molding section and the pulp molding transfer section. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1This is a schematic diagram of the equipment structure of a fully automatic high-quality pulp molding microwave drying and forming equipment of the present invention;

[0040] Figure 2 This is a front view of the suction and filtration molding part of a fully automatic high-quality pulp molding microwave drying and molding equipment of the present invention;

[0041] Figure 3 This is a left view of the suction and filtration molding part of the fully automatic high-quality pulp molding microwave drying and molding equipment of the present invention;

[0042] Figure 4 This is a front view of a microwave drying and forming part in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0043] Figure 5 This is a left view of a microwave drying and forming part in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0044] Figure 6 This is a front view of a pulp molding transfer part in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0045] Figure 7 This is a schematic diagram of the cooling circulation system structure in a fully automatic high-quality pulp molding microwave drying and forming equipment of the present invention;

[0046] Figure 8 This is a schematic diagram of a radiator of a cooling circulation system in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0047] Figure 8 This is a schematic diagram of a radiator of a cooling circulation system in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0048] Fig. 9 It is a top view of a pulp molding equipment slide in a fully automatic high-quality pulp molding microwave drying and molding equipment of the present invention;

[0049] Fig.10 This is a bottom view of a pulp molding equipment slide in a fully automatic high-quality pulp molding microwave drying and molding equipment of the present invention;

[0050] Fig.11 It is an assembly diagram of a microwave hot pressing lower mold, a microwave hot pressing upper mold, a waveguide plate and a microwave heating system in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0051] Fig.12 This is a schematic diagram of the structure of a microwave heating system in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0052] Fig.13This is a schematic diagram of the structure of a microwave emission system in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0053] Fig.14 This is a schematic diagram of the structure of a waveguide plate in a fully automatic high-quality pulp molding microwave drying and forming device of the present invention;

[0054] Fig.15 It is a top view of the microwave hot pressing upper mold structure in a fully automatic high-quality pulp molding microwave drying and forming equipment of the present invention;

[0055] Fig.16 This is a front view of the microwave hot pressing upper mold structure in a fully automatic high-quality pulp molding microwave drying and forming equipment of the present invention;

[0056] Fig.17 It is a left sectional view of the microwave hot pressing upper mold structure in a fully automatic high-quality pulp molding microwave drying and forming equipment of the present invention;

[0057] Fig.18 It is a main cross-sectional view of the microwave hot pressing upper mold structure in a fully automatic high-quality pulp molding microwave drying and forming equipment of the present invention;

[0058] In the figure: upper shell, 2-hydraulic system of suction and filtration molding part, 3-hydraulic system of microwave drying molding part, 4-hydraulic system of transfer part, 5-cooling circulation system, 6-pulp molding transfer part, 7-slide, 8-lower shell, 9-microwave drying molding part, 11-suction and filtration molding part, 12-extrusion die mounting plate, 13-pillar, 14-extrusion die, 15-slurry suction die, 16-vacuum rotating triangular bracket, 17-vacuum water filter pipe, 19-slurry tank, 20-air blow pipe, 21-piston rod, 22-lifting plate, 23-rotating motor, 24-slurry suction mold fixing plate, 25-guide column, 26-coupling, 27-extension plate, 28-slurry pool, 29-reflow trough, 31-hollow shaft, 32-steel pipe, 33-liftable fixing plate, 34-microwave heating system, 35-waveguide plate, 36-microwave hot pressing upper mold, 37-guide rail, 39-slider, 40-cooling water drain pipe, 41-transfer plate, 42-mold base, 43-hot pressing lower mold fixing plate, 44-microwave hot Press down die, 45-microwave emission port, 46-heat exchanger cold water pipe, 47-heat exchanger hot water pipe, 48-transfer mold, 49-cold water inlet pipe, 50-hot water outlet pipe, 51-cold water tank, 52-hot water tank, 53-circulating water pump, 54-water pipe, 55-radiator, 56-electrical cabinet, 58-water inlet, 59-water outlet, 60-frame, 61-ball screw shaft, 62-bearing bracket, 63-servo motor, 64-rolling bearing, 65-screw nut, 66-microwave Transmitting system, 67-waveguide channel, 68-isolation plate, 69-protective isolation cover, 70-filter power supply, 71-heat exchanger, 72-magnetron, 73-antenna, 74-microwave receiving hole, 75-rectangular microwave release hole, 76-circular microwave release hole, 77-waveguide tube, 78-fastening screw, 79-core, 80-guide column groove, 81-screw groove, 82-front support shell, 83-transmission window, 84-rear support shell, 85-waveguide groove, 86-core support shell. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] See also Figure 1-Figure 18 A fully automatic high-quality pulp molding microwave drying and forming equipment, comprising: a microwave drying and forming part 9, a suction and filtration forming part 11, a pulp molding transfer part 6, a slide 7 and a cooling circulation system 5, wherein the microwave drying and forming part 9, the suction and filtration forming part 11, the pulp molding transfer part 6 and the slide 7 are arranged between an upper shell 1 and a lower shell 8;

[0061] A set of slides 7 are provided at the lower end of the microwave drying forming part 9 for providing movable support to the lower end thereof, and a set of microwave drying end hydraulic systems 3 are provided at the upper end of the pulp microwave drying forming part 9 for providing hydraulic pressure to the interior thereof and are arranged at the center of the upper shell 1, and a cooling circulation system 5 is arranged around the transfer part hydraulic system 4 and is directly in a cooling relationship with the microwave drying forming part 9;

[0062] The microwave drying and forming section 9 includes, from bottom to top according to the installation method, a hot pressing lower mold base 42, a hot pressing lower mold fixing plate 43, a microwave hot pressing lower mold 44, a microwave hot pressing upper mold 36, a waveguide plate 35, a microwave heating system 34, a lifting fixing plate 33 and a microwave drying end hydraulic system 3.

[0063] The suction and filtration forming part 11 includes a slurry tank 19, an air blower 20, a vacuum rotating triangular bracket 16, a slurry suction mold fixing plate 24, a slurry suction mold 15, a rotating motor 23, a lifting plate 22, a vacuum water filter pipe 17, an extrusion mold 14 and a suction and filtration end hydraulic system 2 in order from bottom to top according to the installation method. Four partitions are arranged in the slurry tank 19, and are connected to the bottom of the tank by welding. The slurry tank 19 is divided into two cavities, a slurry tank 28 and a reflux tank 29. The reflux tank 28 in the slurry tank 19 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 29 is provided with a reflux valve and an external reflux pipe leading to the slurry tank. The slurry tank 28 in the slurry tank 19 is used to provide the raw material pulp required for the production of the fully automatic fine pulp molding microwave drying forming equipment. The side wall of the slurry tank 28 is provided with a slurry inlet valve and a drain valve for providing and removing slurry, and the two are connected to the external pipeline;

[0064] A large number of small holes with a diameter of 2 mm are opened on the horizontal surface of the air blast pipe 20 and are evenly distributed on the surface of the external pipe. The size of the holes is smaller than the bottom area of ​​the slurry pool and is fixed to the bottom of the pool by U-shaped screws. The vacuum rotating triangular bracket 16 is a regular triangular prism frame structure. One side of the regular triangular prism structure is the working surface, and the other two sides are regarded as the supporting surfaces of the working surface. The front center of the working surface of the vacuum rotating triangular bracket 16 is sunken 10 mm inward in a positive drafting manner and is connected to a half cylindrical hollow cavity provided on the back of the working surface. A cylindrical header is provided at the top of the vertical line of the diagonal angle of the working surface of the vacuum rotating triangular bracket 16. The side of the cylindrical header is tangent to the two supporting surfaces, and the corner is rounded at the same time. The rounding radius is the radius of the cylindrical header plus the thickness of the supporting surface.

[0065] The semi-cylindrical hollow cavity on the back of the working surface of the vacuum rotating triangular bracket 16 is connected to the cylindrical header tangent to the supporting surface through steel pipes 32 distributed at equal intervals. The axis of the cylindrical header on both sides of the vacuum rotating triangular bracket 16 extends a certain distance outward from the hollow shaft 31, and is connected to the shaft in the bearing bracket at both ends of the lifting plate 22. The left end of the hollow shaft is connected to the vacuum tank through the vacuum water filter pipe 17 to form the vacuum suction filter molding part 11, and the right end of the hollow shaft is connected to the rotating motor 23 through a coupling to realize the flipping of the vacuum rotating triangular bracket 16.

[0066] The rotating motor 23 is fixed to the extension plate 27 of the lifting plate 22 by screws. The extrusion mold 14 in the suction filter molding part 11 is fixed to the back of the upper shell 1 by screws and is located at the center of the four groups of hydraulic cylinders in the hydraulic system 2 of the molding part. The slurry suction mold 15, the slurry suction mold fixing plate 24 and the vacuum rotating triangular bracket 16 in the suction filter molding part 11 are connected from top to bottom in sequence by screws and sealing rings, and are finally connected to the vacuum water filter pipe 17.

[0067] Four guide pillars 25 are provided at the lower end of the suction and filtration end hydraulic system 2 and are interposed between the upper shell 1 and the lower shell 8. The suction and filtration end hydraulic system 2 is composed of four groups of hydraulic cylinders and is fixed to the left end of the upper shell 1 by fastening screws. The lifting plate 22 is a rectangular steel plate. Both ends of the steel plate are provided with round holes with a diameter smaller than that of the piston rod 21, and a bearing bracket is provided at the center. The four groups of hydraulic cylinders of the suction and filtration end hydraulic system 2 extend four piston rods 21 toward the lower shell 8, and the piston rods 21 are connected to two independent lifting plates 22 by threaded flanges and fastening screws.

[0068] As a first embodiment of the present invention, during the actual operation of the suction and filtration forming section 11, the vacuum rotating triangle bracket 16 drives the slurry suction mold 15 to rotate the working surface to the slurry tank 19, the hydraulic system 2 of the suction and filtration forming section extends the piston rod to drive the vacuum rotating triangle bracket 16 and the slurry suction mold 15 fixed on the lifting plate 22 to move downward, so that the slurry suction mold 15 is immersed in the pulp in the slurry tank 19, the vacuum water filter pipe 17 opens the vacuum, so that the slurry suction mold starts to absorb slurry and forms an original wet paper blank on the slurry suction mold 15 and completes one water filtration, and then the vacuum rotating triangle bracket 180° is turned over. The bracket 16 causes the slurry suction mold 15 to face the extrusion mold 14, and the hydraulic system 2 of the suction and filtration molding part shortens the piston rod, causing the slurry suction mold 15 and the extrusion mold 14 to complete the mold closing and extrusion to form a shaped wet paper blank and complete the second water filtration. Then, the vacuum rotating triangular bracket 16 is turned over 180° again, causing the slurry suction mold 15 to face the slurry tank 19, and waits for the slide 7 to transfer the microwave hot pressing lower mold 44 to the suction and filtration molding part 11 to complete the station conversion of the shaped wet paper blank. During the period when the microwave hot pressing lower mold 44 arrives at the suction and filtration molding part 11, the vacuum water filtration pipe 17 is kept open to complete the third water filtration.

[0069] The microwave drying forming part 9 includes, from bottom to top, a hot pressing lower mold base 42, a hot pressing lower mold fixing plate 43, a microwave hot pressing lower mold 44, a microwave hot pressing upper mold 36, a waveguide plate 35, a microwave heating system 34, a lifting fixing plate 33 and a microwave drying end hydraulic system 3 according to the installation method. The microwave heating system 34 is composed of a protective isolation cover 69 and a microwave transmitting system 66. The protective isolation cover 69 is a cast iron frame, and the iron frame is provided with isolation plates 68 welded horizontally and vertically, and the entire protective isolation cover 69 is evenly divided into 28 areas for independent and distributed installation of the microwave transmitting system 66.

[0070] The isolation plate 68 can provide protective support when the protective isolation cover 69 is under pressure, and a number of rectangular holes of the same size and specification are evenly distributed on the isolation plate 68 for interconnection between various areas, and provide a channel for the later microwave emission system 66 internal circuit, pipeline heat exchanger cold water pipe 46 and heat exchanger hot water pipe 47 to connect, and 28 circular microwave emission ports 45 are evenly distributed on the top cover surface of the protective isolation cover 69 for accommodating the antenna 73;

[0071] The microwave transmitting system 66 is composed of six parts: a heat exchanger cold water pipe 46, a heat exchanger hot water pipe 47, a heat exchanger 71, a filter power supply 70, a magnetron 72 and an antenna 73. The magnetron 72 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 70 is converted into microwave energy. The heat exchanger 71 is used to absorb the heat generated by the magnetron 72 during operation. The heat exchanger cold water pipe 46 and the heat exchanger hot water pipe 47 provided on the side of the heat exchanger 71 are used to realize the circulation of the cooling medium in the heat exchanger.

[0072] The waveguide plate 35 is a rectangular aluminum plate, the front side of which contacts the cover surface of the protective isolation cover 69, and the back side of which contacts the bottom surface of the microwave hot pressing upper mold 36. The waveguide plate 35 is provided with 28 groups of waveguide channels 67 for conducting microwaves, that is, the microwaves generated by the microwave transmitting system 66 are guided into the microwave hot pressing upper mold 36 according to a certain route. The contact surface between the waveguide plate 35 and the protective isolation cover 69 is evenly distributed with 28 rectangular microwave receiving holes 74.

[0073] Twenty rectangular microwave release holes 75 are concentratedly provided at the corresponding positions of the contact surface between the waveguide plate 35 and the microwave hot pressing upper mold 36, and four circular microwave release holes 76 are respectively provided at the non-contact positions on both sides of the contact surface corresponding positions. A total of 28 holes are used to connect with the microwave hot pressing upper mold 36. The microwave receiving holes and the microwave release holes in the waveguide plate 35 correspond one to one through the waveguide channel 67, thereby realizing the effect of uniform and directional wave guiding.

[0074] The microwave hot pressing upper mold 36 is composed of four parts: a front support shell 82, a core support shell 86, a rear support shell 84 and a core 79. The front support shell 82, the core support shell 86 and the rear support shell 84 are made of aluminum 6061, and the core 79 is made of polytetrafluoroethylene. The front support shell 82 and the rear support shell 84 have the same structure and are similar to the traditional hot pressing upper mold structure. A guide column groove 80 is provided in the center of the support shell for installing the guide column, and screw grooves 81 are provided on both sides of the guide column groove 80.

[0075] The microwave hot pressing upper mold 36 is fixed to the upper end of the waveguide plate 35 by long screws. Four groups of waveguide channels 67 are evenly distributed on the sides of the front support shell 82 and the rear support shell 84, and the circular microwave release holes 76 of the waveguide plate 35 are connected through the waveguide tube 77 to improve the uniformity of microwave distribution in the mold during drying. Six groups of threaded holes are arranged on the sides of the front support shell 82 and the rear support shell 84, and the side wall fastening screws 78 are arranged to realize the connection between the front support shell 82, the rear support shell 84 and the core support shell 86. The core support shell 86 is a rectangular trough structure, that is, it is composed of four side walls and a bottom plate.

[0076] The left and right side walls of the groove body of the mold core support shell 86 are similar to the front support shell 82 and the rear support shell 84, and are used to position and fix the mold, that is, a guide column groove 80 is provided in the center of the left and right side walls for installing the guide column, and a through screw groove 81 is provided on both sides of the guide column groove 80, and the microwave hot pressing upper mold 36 is fixed to the waveguide plate 35 by long screws. The front and rear side walls of the mold core support shell 86 are provided with a waveguide groove 85 and four transmission windows 83 are evenly distributed at the bottom of the waveguide groove 85, and the position is the same as that in the front support shell 82 and the rear support shell 84. The four groups of waveguide channels 67 correspond one to one, the bottom plate of the core support shell 86 is provided with 20 transmission windows 83, and the positions of the 20 transmission windows 83 correspond one to one with the 20 rectangular microwave release holes 75 provided in the middle of the waveguide plate 35. The microwave drying end hydraulic system 3 is composed of a group of hydraulic cylinders and 4 guide pillars and is fixed to the center position of the upper shell 1 by fastening screws. The lifting and fixing plate 33 is connected with the hydraulic cylinder piston rod and 4 guide pillars of the microwave drying end hydraulic system 3 by a threaded flange and fastening screws.

[0077] The microwave hot pressing upper mold 36, the waveguide plate 35, and the microwave heating system 34 are sequentially mounted on the lifting and fixing plate 33 by screws. The piston rod is used to realize the vertical movement of the microwave hot pressing upper mold 36, the waveguide plate 35, the microwave heating system 34 and other components, and the guide column is used to realize the horizontal positioning of the microwave hot pressing upper mold 36, the waveguide plate 35, the microwave heating system 34 and other components.

[0078] The hot pressing lower die base 42 is a rectangular cast iron box, the interior of the box is hollowed out and provided with a support beam to strengthen the support force of the working surface of the box, and the side walls of the box are provided with reinforcing ribs to strengthen the support force of the working surface. The bottom surface of the hot pressing lower die base 42 is provided with two vacuum pipe joints 39 and a cooling water drainage pipe 40;

[0079] The vacuum pipe joint 39 is used to connect to the vacuum suction system and provide vacuum suction force when the microwave hot pressing lower mold 44 is in operation, and the cooling water drain pipe 40 is used to connect to the sewage tank and discharge the water vapor cooled in the hot pressing lower mold base 42 when the vacuum suction system is in use when the microwave hot pressing lower mold 44 is in operation;

[0080] The working surface of the hot pressing lower mold base 42 is provided with vacuum holes and threaded holes, which are respectively used to connect the vacuum holes and threaded holes in the hot pressing lower mold fixing plate 43 and the microwave hot pressing lower mold 44, and are also used to connect the vacuum exhaust system and tighten the microwave hot pressing lower mold 44. A metal mesh with small pores is attached to the surface of the microwave hot pressing lower mold 44. When the vacuum suction system and the microwave heating system 34 are running at the same time, the metal mesh can filter the microwaves in the vacuum suction air to prevent microwave leakage.

[0081] As a second embodiment of the present invention: before the microwave drying forming section 9 is dried, the suction and filtration forming section 11 docks with the microwave hot pressing lower mold 44 of the slurry suction mold 15 to form a fixed wet paper blank, and presses it into a block according to the microwave hot pressing lower mold 44, and transfers it to the specified position of the microwave drying forming section 9 by the slide 7. The piston rod of the hydraulic cylinder of the hydraulic system 3 of the microwave drying forming section is extended to cause the microwave hot pressing upper mold 36 fixed to the lifting fixed plate 33 to move downward, and complete the mold closing at the microwave hot pressing lower mold 44 at the specified position. During drying, the microwave heating system 34 is turned on, and the microwave generated by the microwave heating system 34 enters the microwave hot pressing mold 44 through the waveguide plate 35, the waveguide channel 67, the waveguide tube 77 and the transmission window 83. The pressing mold 44 and the microwave hot pressing upper mold 36 are formed in a microwave metal mold cavity, and the initially shaped wet paper blank is dried and secondarily shaped. The water vapor generated in the forming process passes through the microwave hot pressing lower mold 44, the hot pressing lower mold fixing plate 43 and the hot pressing lower mold base 42 in sequence under the action of vacuum suction force, and is finally discharged through the vacuum pipe joint 39 and a cooling water drain pipe 40. After drying, the microwave heating system 34 is turned off, and the piston rod of the hydraulic cylinder of the hydraulic system 3 of the microwave drying and forming part is shortened, causing the microwave hot pressing upper mold 36 to move upward and complete the mold separation with the microwave hot pressing lower mold 44. The slide 7 transfers the microwave hot pressing lower mold 44 and the pulp molded product to the pulp molding transfer part 6 to complete the station transfer.

[0082] The cooling circulation system 5, in the order from left to right according to the installation method, includes a cold water inlet pipe 49, a hot water outlet pipe 50, a radiator 55, a cold water tank 51, a hot water tank 52, a water pipe 54, and a circulation water pump 53. The cold water tank 51 and the hot water tank 52 are cylindrical stainless steel tanks. There are three feet at the bottom of the tank for support and they are fixed by screws. There is a water inlet valve at the top of the stainless steel tank and a water outlet valve at the bottom. The cold water tank 51 is fixed on the right side of the upper shell 1, near the rear end of the transfer part hydraulic system 4;

[0083] The hot water tank 52 is fixed on the right side of the upper shell 1, near the front end of the transfer part hydraulic system 4. The cold water inlet pipe 49 is externally connected to the water outlet valve of the cold water tank 51, the hot water outlet pipe 50 is externally connected to the water inlet valve of the hot water tank 52, and the circulation water pump 53 is connected in series between the two. The radiator 55 is a water-cooled radiator. There are a water inlet 58 and a water outlet 59 on the left and right sides at the top of the radiator respectively. The radiator 55 is connected in parallel with the cold water tank 51 and the hot water tank 52 through the water pipe 54, and the cold water tank 51 and the hot water tank 52 are connected in series through the water pipe 54.

[0084] As the third embodiment of the present invention: The heat generated by the transformer 72 and the magnetron 73 in the microwave heating system 34 in the heat dissipation system 5 is absorbed by the cooling water in the heat exchanger 71. Subsequently, under the action of the circulation water pump 53, the cooling water in the heat exchanger 71 reaches the radiator 55 via the heat exchanger hot water pipe 47, the hot water outlet pipe 50, and the hot water tank 52 for cooling, and then under the action of the circulation water pump 53, the cooling water reaches the heat exchanger 71 via the cold water tank 51, the cold water inlet pipe 49, and the heat exchanger cold water pipe 46 to complete the heat dissipation cycle.

[0085] The sliding table 7, in the order from left to right according to the installation method, includes a frame 60, rolling bearings 64, a ball screw shaft 61, a coupling 26, a servo motor 63, a guide rail 37, a slider 39, a transfer plate 41, and a lead screw nut 65. The frame 60 is composed of 5 load-bearing aluminum alloy frame profiles to form 3 cross beams and 2 main beams, in a "day" shape, and is fastened to the center position of the lower shell 8 from left to right by screws and angle codes, and the highest surface of the frame 60 is at the same horizontal position as the highest surface of the lower shell 8;

[0086] The two main beams of the frame 60 penetrate through the suction filtration forming part 11, the microwave drying forming part 9, and the pulp molding transfer part 6 from left to right in sequence, and are fixed to the front and rear sides of the slurry tank 19 by screws and angle codes. The cross beam at the center of the "day" - shaped frame of the frame 60 is at the center position between the suction filtration forming part 11 and the microwave drying forming part 9, and the other two cross beams are respectively at the left end of the microwave drying forming part 9 and the right end of the pulp molding transfer part 6;

[0087] The frame 60 is located at the center position of the right side of the beam of the microwave drying and forming section 9 and is provided with a bearing bracket, which is fixed by screws and angle codes. The rolling bearing 64 is fixed in the bearing bracket and its overall position is higher than the top surface of the beam. The frame 60 is located at the center position of the left side of the beam of the pulp molding transfer section 6 and is also provided with a bearing bracket, which is fixed by screws and angle codes. The rolling bearing 64 is fixed in the bearing bracket and its overall position is higher than the top surface of the beam.

[0088] There are two guide rails 37, which pass through the suction filter forming part 11, the microwave drying forming part 9 and the pulp molding transfer part 6 from left to right, and are fixed to the two main beams of the frame 60 by screws through the threaded hole 3 in the center of the guide rail 37. Each guide rail 37 is equipped with three groups of rectangular sliders 39, and the transfer plate 41 is stably fixed to the six groups of sliders 39 by screws to realize the movement of the transfer plate 41 between various stations;

[0089] The servo motor 63 is fixed to the right center of the beam of the pulp molding transfer part 6 by means of a motor fixing bracket and screws. The axis of the servo motor 63 is concentric with the rolling bearing 64 in the bearing bracket at the center of the beam of the microwave drying molding part 9 and the pulp molding transfer part 6, and is at the same height. The left and right ends of the ball screw shaft 61 are respectively fixed to the rolling bearing 64 on the bearing bracket at the center of the beam of the microwave drying molding part 9 and the pulp molding transfer part 6 near the screw part.

[0090] The ball screw shaft 61 and the servo motor 63 are connected in series through the coupling 26 to achieve transmission. The screw nut 65 is a rectangular structure with a thread in the center of the rectangle to achieve movement and rotation on the ball screw shaft 61. The rectangular plane of the screw nut 65 is provided with a threaded hole, and the transfer plate 41 is connected to the screw nut 65 by screws.

[0091] As the fourth embodiment of the present invention: during the actual operation of the slide 7, the servo motor 63 drives the ball screw shaft 61 to generate positive and negative torques in the forward and reverse directions, so that the screw nut 65 mounted on the ball screw shaft 61 generates thrust and tension, and drives the transfer plate 41 to move left and right on the guide rail 37 between the suction filtration molding section 11, the microwave drying molding section 9 and the pulp molding transfer section 6.

[0092] The micro pulp transfer part 6 includes a transfer mold 48, a liftable fixed plate 33 and a transfer part hydraulic system 4 in order from bottom to top according to the installation method. The transfer part hydraulic system 4 is composed of a group of hydraulic cylinders and 4 guide pillars and is fixed to the right end of the upper shell 1 by fastening screws. The liftable fixed plate 33 is externally connected to a vacuum system, and a large number of air holes and threaded mounting holes are left on the plate surface. The transfer mold 48 is provided with a circle of air holes that penetrate the entire mold. When the transfer mold 48 is fixed to the liftable fixed plate 33 by screws, the external vacuum system of the liftable fixed plate 33 is connected to the air holes that penetrate the mold in the transfer mold 48. When the external vacuum is negative pressure, the air holes on the transfer mold 48 generate suction; when the external vacuum is positive pressure, the air holes on the transfer mold 48 generate repulsion. The liftable fixed plate 33 is connected to the hydraulic cylinder piston rod and 4 guide pillars of the transfer part hydraulic system 4 through a threaded flange and fastening screws. The piston rod is used to realize the vertical movement of the transfer mold 48, and the guide pillar is used to realize the horizontal positioning of the transfer mold 48.

[0093] As the fifth embodiment of the present invention: during the actual operation of the pulp molding transfer part 6, the piston rod of the hydraulic cylinder in the hydraulic system 4 of the transfer part is extended, so that the transfer mold 48 and the microwave hot pressing lower mold 44 transferred to the pulp molding transfer part 6 through the slide 7 are molded together, and then the external vacuum system of the liftable fixed plate 33 is set to negative pressure, and the air holes on the transfer mold 48 generate suction, so that the pulp molded product that has been microwave-dried on the microwave hot pressing lower mold 44 is adsorbed on the transfer mold 48, and the piston rod of the hydraulic cylinder in the hydraulic system 4 of the transfer part is shortened, so that the pulp molded product is separated from the microwave hot pressing lower mold 44, thereby completing the work station transfer of the product, and finally, the external robotic arm carries the tray and moves to the bottom of the transfer mold 48, and the external vacuum system of the liftable fixed plate 33 is set to positive pressure. Under the repulsive force of the transfer mold 48, the pulp molded product is separated from the tray and transferred by the robotic arm.

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully automatic high-quality pulp molding microwave drying and forming equipment, comprising: A microwave drying and forming section (9), a suction and filtration forming section (11), a pulp molding transfer section (6), a slide table (7) and a cooling circulation system (5), characterized in that the microwave drying and forming section (9), the suction and filtration forming section (11), the pulp molding transfer section (6) and the slide table (7) are arranged between an upper shell (1) and a lower shell (8); The lower end of the microwave drying forming section (9) is provided with a slide table (7) for providing movable support to the lower end thereof, the upper end of the pulp microwave drying forming section (9) is provided with a microwave drying end hydraulic system (3) for providing hydraulic pressure to the interior thereof and is arranged at the center of the upper shell (1), and the cooling circulation system (5) is arranged around the transfer section hydraulic system (4) and is in direct cooling relationship with the microwave drying forming section (9); The microwave drying forming section (9) comprises, from bottom to top according to the installation method, a hot pressing lower mold base (42), a hot pressing lower mold fixing plate (43), a microwave hot pressing lower mold (44), a microwave hot pressing upper mold (36), a waveguide plate (35), a microwave heating system (34), a lifting fixing plate (33) and a microwave drying end hydraulic system (3).

2. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 1 is characterized by: The suction filter forming part (11) comprises, from bottom to top, a slurry tank (19), an air blowing pipe (20), a vacuum rotating triangular bracket (16), a slurry suction mold fixing plate (24), a slurry suction mold (15), a rotating motor (23), a lifting plate (22), a vacuum water filter pipe (17), an extrusion mold (14) and a suction filter end hydraulic system (2), according to the installation method. The slurry tank (19) is provided with four partitions, which are connected to the tank bottom by welding. The slurry tank (19) is divided into a slurry pool (28) and a reflux tank ( 29) two cavities, the reflux groove (28) in the slurry groove (19) 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 groove (29) is provided with a reflux valve and an external reflux pipe leading to the slurry tank, the slurry pool (28) in the slurry groove (19) is used to provide the raw material pulp required for the production of the fully automatic fine pulp molding microwave drying and forming equipment, and the side wall of the slurry pool (28) is provided with a slurry inlet valve and a drain valve for providing and removing slurry, and the two are connected to the external pipeline; A large number of small holes with a diameter of 2 mm are opened on the horizontal surface of the air blowing pipe (20) and are evenly distributed on the surface of the external pipe. The size of the small holes is smaller than the bottom area of ​​the slurry pool and is fixed to the bottom of the pool by U-shaped screws. The vacuum rotating triangular bracket (16) is a regular triangular prism frame structure. One side of the regular triangular prism structure is the working surface, and the other two side surfaces are regarded as the supporting surfaces of the working surface. The front center of the working surface of the vacuum rotating triangular bracket (16) is sunken inward by 10 mm in a positive drafting manner and is connected to a semi-cylindrical hollow cavity provided on the back of the working surface. A cylindrical header is provided at the top of the vertical line of the working surface of the vacuum rotating triangular bracket (16) at the diagonal angle. The side of the cylindrical header is tangent to the two supporting surfaces, and the corner is rounded (the rounding radius is the radius of the cylindrical header plus the thickness of the supporting surface); The semi-cylindrical hollow cavity on the back of the working surface of the vacuum rotating triangular bracket (16) is connected to the cylindrical header tangent to the supporting surface through steel pipes (32) distributed at equal intervals. The axis of the cylindrical header on both sides of the vacuum rotating triangular bracket (16) extends outwards with a certain distance of hollow shafts (31) respectively, and is connected to the bearings in the bearing brackets at both ends of the lifting plate (22). The left end of the hollow shaft is connected to the vacuum tank through the vacuum water filter pipe (17) to form a vacuum suction filter molding part (11), and the right end of the hollow shaft is connected to the rotating motor (23) through a coupling to realize the flipping of the vacuum rotating triangular bracket (16); The rotating motor (23) is fixed to the extension plate (27) of the lifting plate (22) by screws. The extrusion die (14) in the suction filter forming part (11) is fixed to the back of the upper shell (1) by screws and is located at the center of four groups of hydraulic cylinders in the hydraulic system (2) of the forming part. The slurry suction die (15), the slurry suction die fixing plate (24) and the vacuum rotating triangular bracket (16) in the suction filter forming part (11) are connected from top to bottom in sequence by screws and sealing rings, and are finally connected to the vacuum water filter pipe (17).

3. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 2 is characterized by: The suction filter end hydraulic system (2) is provided with four guide pillars (25) at the lower end and is interposed between the upper shell (1) and the lower shell (8). The suction filter end hydraulic system (2) is composed of four groups of hydraulic cylinders and is fixed to the left end of the upper shell (1) by fastening screws. The lifting plate (22) is a rectangular steel plate. Both ends of the steel plate are provided with round holes with a diameter smaller than that of the piston rod (21), and a bearing bracket is provided at the center. The four groups of hydraulic cylinders of the suction filter end hydraulic system (2) extend four piston rods (21) toward the lower shell (8), and the piston rods (21) are connected to two independent lifting plates (22) by threaded flanges and fastening screws.

4. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 1 is characterized by: The microwave heating system (34) is composed of a protective isolation cover (69) and a microwave emission system (66). The protective isolation cover (69) is a cast iron frame, and a horizontally and vertically welded isolation plate (68) is arranged inside the iron frame. The entire protective isolation cover (69) is evenly divided into 28 areas for independent and distributed installation of the microwave emission system (66). The isolation plate (68) is evenly distributed with a plurality of groups of rectangular holes of the same size and specification for interconnecting various areas, and provides a channel for connecting the circuits and pipes (heat exchanger cold water pipe (46) and heat exchanger hot water pipe (47)) in the later microwave emission system (66). The top cover surface of the protective isolation cover (69) is evenly distributed with 28 circular microwave emission ports (45) for accommodating antennas (73); The microwave transmitting system (66) is composed of six parts, namely, a heat exchanger cold water pipe (46), a heat exchanger hot water pipe (47), a heat exchanger (71), a filter power supply (70), a magnetron (72) and an antenna (73). The magnetron (72) is an electric vacuum device for generating microwave energy. Under the control of mutually perpendicular constant magnetic fields and constant electric fields, electrons in the tube interact with a high-frequency electromagnetic field, and the energy in the constant electric field provided by the filter power supply (70) is converted into microwave energy. The heat exchanger (71) is used to absorb the heat generated by the magnetron (72) during operation. The heat exchanger cold water pipe (46) and the heat exchanger hot water pipe (47) provided on the side of the heat exchanger (71) are used to realize the circulation of the cooling medium in the heat exchanger. The waveguide plate (35) is a rectangular aluminum plate, the front side of which contacts the cover surface of the protective isolation cover (69), and the back side of which contacts the bottom surface of the microwave hot pressing upper mold (36). The waveguide plate (35) is provided with 28 groups of waveguide channels (67) for conducting microwaves, that is, the microwaves generated by the microwave emission system (66) are introduced into the microwave hot pressing upper mold (36) according to a certain route. 28 rectangular microwave receiving holes (74) are evenly distributed on the contact surface between the waveguide plate (35) and the protective isolation cover (69). 20 rectangular microwave release holes (75) are concentratedly provided at the corresponding positions of the contact surface between the waveguide plate (35) and the microwave hot pressing upper mold (36), and 4 circular microwave release holes (76) are respectively provided at the non-contact positions on both sides of the corresponding positions of the contact surface. A total of 28 holes are used for docking with the microwave hot pressing upper mold (36). The microwave receiving holes and the microwave release holes in the waveguide plate (35) correspond to each other through the waveguide channels (67), thereby achieving a uniform and directional wave guiding effect.

5. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 4 is characterized by: The microwave hot pressing upper mold (36) is composed of four parts: a front support shell (82), a core support shell (86), a rear support shell (84) and a core (79), wherein the materials of the front support shell (82), the core support shell (86) and the rear support shell (84) are aluminum 6061, and the material of the core (79) is polytetrafluoroethylene. The front support shell (82) and the rear support shell (84) have the same structure and are similar to the traditional hot pressing upper mold structure. A guide column groove (80) is provided in the center of the support shell for installing the guide column, and screw grooves (81) are provided on both sides of the guide column groove (80); The microwave hot pressing upper mold (36) is fixed to the upper end of the waveguide plate (35) by long screws. Four groups of waveguide channels (67) are evenly distributed on the sides of the front support shell (82) and the rear support shell (84), and are connected to the circular microwave release hole (76) of the waveguide plate (35) through the waveguide tube (77), and the uniformity of microwave distribution in the mold during drying is improved. Six groups of threaded holes are provided on the sides of the front support shell (82) and the rear support shell (84), and side wall fastening screws (78) are arranged to realize the connection between the front support shell (82), the rear support shell (84) and the core support shell (86). The core support shell (86) is a rectangular trough structure, that is, it is composed of four side walls and a bottom plate. The left and right side walls of the groove body of the core support shell (86) are similar to those of the front support shell (82) and the rear support shell (84) and are used to position and fix the mold, that is, a guide column groove (80) is provided in the center of the left and right side walls for installing the guide column, and screw grooves (81) are provided on both sides of the guide column groove (80) to fix the microwave hot pressing upper mold (36) to the waveguide plate (35) by long screws. The front and rear side walls of the core support shell (86) are provided with waveguide grooves (85) and four transmission windows (83) are evenly distributed at the bottom of the waveguide grooves (85), and the positions are similar to those of the front support shell (82) and the rear support shell (84). ) in a one-to-one correspondence with the four groups of waveguide channels (67) in the mold core support shell (86), the bottom plate of the mold core support shell (86) is provided with 20 transmission windows (83), the positions of the 20 transmission windows (83) correspond one-to-one with the 20 rectangular microwave release holes (75) provided in the middle of the waveguide plate (35), the microwave drying end hydraulic system (3) is composed of a group of hydraulic cylinders and four guide pillars and is fixed to the center position of the upper shell (1) by fastening screws, and the lifting and fixing plate (33) is connected to the hydraulic cylinder piston rod and the four guide pillars of the microwave drying end hydraulic system (3) by a threaded flange and fastening screws; The microwave hot pressing upper mold (36), the waveguide plate (35), and the microwave heating system (34) are sequentially mounted on the lifting and fixing plate (33) by means of screws; the piston rod is used to realize vertical movement of the microwave hot pressing upper mold (36), the waveguide plate (35), the microwave heating system (34), and other components; and the guide column is used to realize horizontal positioning of the microwave hot pressing upper mold (36), the waveguide plate (35), the microwave heating system (34), and other components.

6. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 4 is characterized by: The hot pressing lower die base (42) is a rectangular cast iron box, the interior of the box is hollowed out and provided with a support beam for strengthening the supporting force of the working surface of the box, and the side walls of the box are provided with reinforcing ribs for strengthening the supporting force of the working surface. The bottom surface of the hot pressing lower die base (42) is provided with two vacuum pipe joints (39) and a cooling water drainage pipe (40); The vacuum pipe joint (39) is used to connect to the vacuum suction system and provide vacuum suction force when the microwave hot pressing lower mold (44) is in operation, while the cooling water drain pipe (40) is used to connect to the sewage tank and discharge the water vapor cooled by the hot pressing lower mold base (42) when the vacuum suction system is in use when the microwave hot pressing lower mold (44) is in operation; The working surface of the hot pressing lower die base (42) is provided with vacuum holes and threaded holes, which are used to connect the vacuum holes and threaded holes in the hot pressing lower die fixing plate (43) and the microwave hot pressing lower die (44) respectively, and are also used for the connection of the vacuum pumping system and the fastening of the microwave hot pressing lower die (44). The surface of the microwave hot pressing lower die (44) is attached with a metal mesh with smaller pores. When the vacuum pumping system and the microwave heating system (34) are running simultaneously, the metal mesh can filter microwaves in the vacuum pumped air to prevent microwave leakage.

7. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 1 is characterized by: The cooling circulation system (5) includes a cold water inlet pipe (49), a hot water outlet pipe (50), a radiator (55), a cold water tank (51), a hot water tank (52), a water pipe (54) and a circulation water pump (53) in sequence from left to right according to the installation method. The cold water tank (51) and the hot water tank (52) are cylindrical stainless steel tanks. The bottom of the tank is provided with three feet for support and is fixed by screws. The top of the stainless steel tank is provided with a water inlet valve, and the bottom is provided with a water outlet valve. The cold water tank (51) is fixed on the right side of the upper shell (1), near the rear end of the transfer part hydraulic system (4); The hot water tank (52) is fixed on the right side of the upper shell (1), near the front end of the transfer part hydraulic system (4). The cold water inlet pipe (49) is externally connected to the water outlet valve of the cold water tank (51), the hot water outlet pipe (50) is externally connected to the water inlet valve of the hot water tank (52), and the circulation water pump (53) is connected in series between the two. The radiator (55) is a water-cooled radiator. There are a water inlet (58) and a water outlet (59) on the left and right sides of the top of the radiator respectively. The radiator (55) is connected in parallel with the cold water tank (51) and the hot water tank (52) through the water pipe (54), and the cold water tank (51) and the hot water tank (52) are connected in series through the water pipe (54).

8. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 1, characterized in that: The sliding table (7) includes a frame (60), a rolling bearing (64), a ball screw shaft (61), a coupling (26), a servo motor (63), a guide rail (37), a slider (39), a transfer plate (41) and a screw nut (65) in sequence from left to right according to the installation method. The frame (60) is composed of 5 load-bearing aluminum alloy frame profiles (3 cross beams and 2 main beams), and is fastened to the center position of the lower shell (8) from left to right in a "day" shape by screws and angle codes. The highest surface of the frame (60) is at the same horizontal position as the highest surface of the lower shell (8); The two main beams of the frame (60) pass through the suction filtration forming part (11), the microwave drying and forming part (9) and the pulp molding transfer part (6) from left to right in sequence, and are fixed to the front and rear sides of the slurry tank (19) by screws and angle codes. The cross beam at the center of the "day" - shaped frame of the frame (60) is at the center position of the suction filtration forming part (11) and the microwave drying and forming part (9), and the other two cross beams are respectively at the left end of the microwave drying and forming part (9) and the right end of the pulp molding transfer part (6); The frame (60) is provided with a bearing bracket at the center position of the right side of the beam of the microwave drying and forming part (9), and is fixed by screws and angle brackets. The rolling bearing (64) is fixed in the bearing bracket and its overall position is higher than the top surface of the beam. The frame (60) is also provided with a bearing bracket at the center position of the left side of the beam of the pulp molding transfer part (6), and is fixed by screws and angle brackets. The rolling bearing (64) is fixed in the bearing bracket and its overall position is higher than the top surface of the beam.

9. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 8, characterized in that: There are two guide rails (37) which pass through the suction filter forming section (11), the microwave drying forming section (9) and the pulp molding transfer section (6) from left to right in sequence, and are fixed to the two main beams of the frame (60) by screws through the threaded holes (3) in the center of the guide rails (37). Each of the guide rails (37) is equipped with three groups of rectangular sliders (39), and the transfer plate (41) is stably fixed to the six groups of sliders (39) by screws, so as to realize the movement of the transfer plate (41) between various workstations. The servo motor (63) is fixed to the right center of the beam of the pulp molding transfer part (6) through a motor fixing bracket and screws. The axis of the servo motor (63) is concentric with the rolling bearing (64) in the bearing bracket at the center of the beam of the microwave drying molding part (9) and the pulp molding transfer part (6), and is at the same height. The left and right ends of the ball screw shaft (61) are respectively fixed in the rolling bearing (64) on the bearing bracket at the center of the beam of the microwave drying molding part (9) and the pulp molding transfer part (6) near the screw part. The ball screw shaft (61) and the servo motor (63) are connected in series via a coupling (26) to achieve transmission. The screw nut (65) is a rectangular parallelepiped structure with a thread at the center thereof to achieve movement and rotation on the ball screw shaft (61). The rectangular plane of the screw nut (65) is provided with a threaded hole, and the transfer plate (41) and the screw nut (65) are connected via screws.

10. The fully automatic high-quality pulp molding microwave drying and forming equipment according to claim 1, characterized in that: The micro pulp transfer part (6) includes a transfer mold (48), a liftable fixed plate (33) and a transfer part hydraulic system (4) in order from bottom to top according to the installation method. The transfer part hydraulic system (4) is composed of a group of hydraulic cylinders and four guide pillars and is fixed to the right end of the upper shell (1) by fastening screws. The liftable fixed plate (33) is externally connected to a vacuum system, and a large number of air holes and threaded mounting holes are left on the plate surface. The transfer mold (48) is provided with a circle of air holes that runs through the entire mold. When the transfer mold (48) is fixed to the liftable fixed plate (33) by screws, the liftable fixed plate (33) can be lifted and lowered. The external vacuum system of the lowering fixed plate (33) is connected to the air holes that penetrate the transfer mold (48). When the external vacuum is negative pressure, the air holes on the transfer mold (48) generate suction; when the external vacuum is positive pressure, the air holes on the transfer mold (48) generate repulsion. The liftable fixed plate (33) is connected to the hydraulic cylinder piston rod and four guide pillars of the hydraulic system (4) of the transfer part through a threaded flange and fastening screws. The piston rod is used to realize the vertical movement of the transfer mold (48), and the guide pillars are used to realize the horizontal positioning of the transfer mold (48).

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