Method for manufacturing pulp molded products and wet blank secondary transfer type pulp molding machine

Abstract

The present invention relates to a method and device for making plant fiber products including pulp by molding. The method and device enable both sides of the plant fiber molded product to obtain good effects. The technical scheme is: a method for making pulp molded products, which is carried out according to the following steps: after the wet blank is made in the suction filtration molding mold, it is transferred to a hot pressing and shaping device for hot pressing, drying and shaping to make a pulp molded product, characterized in that: the transfer is to transfer the wet blank from the suction filtration molding mold to the hot pressing and shaping device by using a first wet blank transfer device and a second wet blank transfer device; wherein the first wet blank transfer device extracts the wet blank from the suction filtration molding mold and transfers it to the second wet blank transfer device, and the second wet blank transfer device then transfers the wet blank to the hot pressing and shaping device; the hot pressing and shaping device can be one or more, wherein the multiple hot pressing and shaping devices include a left hot pressing and shaping device and a right hot pressing and shaping device.

Description

Technical Field

[0001] The present invention relates to a method and device for manufacturing plant fiber (referred to as pulp; the same below) products including pulp by molding; the method and device are suitable for manufacturing disposable plant fiber molded products, especially for manufacturing disposable non-planar paper products; such as pulp molded exquisite packaging products, plant fiber (pulp) molded tableware, plant fiber (pulp) molded trays, plant fiber (pulp) molded industrial product shockproof pads, packaging boxes and packaging trays, disposable non-planar plant fiber (pulp) molded decorative three-dimensional wall panels (or plant fiber three-dimensional wallpapers or pulp molded three-dimensional wallpapers) and all disposable plant fiber (pulp) molded products. The fully automatic plant fiber molding machine includes a fully automatic pulp molding machine. Background Art

[0002] The manufacturing process of plant fiber molded products is as follows: the plant fiber is first subjected to suction filtration molding in the suction filtration molding device to form a wet blank of the product, and the wet blank is sent to the hot pressing mold of the hot pressing and shaping device, and the hot pressing mold is closed and the wet blank is hot pressed, dried and shaped to form plant fiber molded products of various shapes. The wet blank is sent from the suction filtration molding mold to the hot pressing mold, and the wet blank is sucked up from the suction filtration molding mold by the wet blank transfer mold in the wet blank transfer device, and directly sent to the hot pressing mold of the hot pressing and shaping device.

[0003] Since the thickness of the wet blank is thicker than the thickness of the product after hot pressing, the wet blank is easily scratched or wrinkled when entering the hot pressing mold, affecting the quality and qualified rate of the product.

[0004] The hot pressing mold is divided into the hot pressing upper mold and the hot pressing lower mold. For exhaust needs, the mold surface of the hot pressing upper mold or the hot pressing lower mold is covered with a metal wire mesh (usually a stainless steel wire mesh). Therefore, when the hot pressing mold is closed from top to bottom, one side of the hot pressing upper mold or the hot pressing lower mold must be covered with a metal wire mesh, which is called the "mesh surface of the hot pressing mold", and the other side has no metal wire mesh, which is called the "smooth surface of the hot pressing mold". Since the metal wire mesh of the hot pressing lower mold is easy to install and the vacuum suction of steam is convenient for the hot pressing lower mold, the metal wire mesh of the hot pressing mold is generally placed on the hot pressing lower mold. The "mesh surface of the hot pressing mold" is suitable for installation on the lower mold of the hot pressing mold.

[0005] The surface of the plant fiber molded product is pressed by the "net surface of the hot pressing mold" and the "glossy surface of the hot pressing mold". Therefore, the side of the plant fiber molded product that contacts the "net surface of the hot pressing mold" is meshed, while the other side is non-mesh. They are called "the net surface of the product" and "the glossy surface of the product" respectively. If the "net surface of the hot pressing mold" is in the lower mold of the hot pressing mold, the products produced will also have the "net surface of the product" facing down and the "glossy surface of the product" facing up.

[0006] The wet blank is formed by vacuum suction on a suction filter forming mold with one or more layers of wire mesh (usually stainless steel wire mesh) on the surface. During suction filter forming, the side that contacts the suction filter is called the "wet blank mesh surface". During the suction filter forming process, as the thickness of the wet blank increases, the suction force on the slurry gradually decreases, the material of the wet blank becomes looser and irregular peaks and valleys appear, so the side far from the suction filter (the back of the "wet blank mesh surface") is called the "wet blank rough surface".

[0007] Usually, the working surface of the suction filter forming mold with a stainless steel wire mesh as the suction filter is facing upwards in the slurry tank for slurry absorption. Therefore, the "wet blank mesh surface" is below the wet blank (the wet blank mesh surface faces downwards), and the "wet blank rough surface" faces upwards; even for the flip-type suction filter forming mold, the mold surface faces downwards in the slurry tank for slurry absorption, and after the slurry absorption is completed, the mold surface is flipped upwards, and then the wet blank is transferred. Therefore, the wet blank produced is also "the wet blank mesh surface" faces downwards, and the "wet blank rough surface" faces upwards.

[0008] The movement of the wet blank is all translation, that is, the direction of the wet blank will not change from the time it is formed in the suction filtration molding die to the time it is sent to the hot pressing mold of the hot pressing shaping device. The wet blank is sucked up from the suction filtration molding die and transferred to the hot pressing mold for hot pressing shaping. The result is that the "rough surface of the wet blank" corresponds to the "glossy surface of the product", and the "net surface of the wet blank" corresponds to the "net surface of the product".

[0009] So far, the "glossy surface" of plant fiber molded products is not smooth, which has become a global problem in the production of plant fiber molded products. The "glossy surface" of the product is not "glossy" mainly because the "wet blank rough surface" is wrinkled and flaky. It is difficult for the "glossy surface of the hot press mold" to calender the "wet blank rough surface".

[0010] The wall thickness of the wet blank is thicker than that of the finished product, and it is easy to be scratched and wrinkled when entering the hot pressing die. There is currently no effective solution to this problem;

[0011] The existing common solution to overcome the problem of "the smooth surface of the product" is to increase the clamping force of the hot pressing mold and adjust the mold gap according to the surface effect of the product. If the product cannot be smooth, the mold gap will be reduced. As a result, even if the clamping force of the hot pressing mold is increased to a large extent, some parts of the product will be pressed black while some parts are still not "smooth", and the surface quality of the product will not be significantly changed. What is even more difficult is that: (1) adjusting the mold gap according to the surface effect of the product is very blind, and it is often difficult to achieve the purpose; (2) the cost of adjusting the mold gap is very high. To adjust the mold gap, the machine must be stopped, the mold must be disassembled, and the mold must be reprocessed. The mold must be cooled down from about 200°C to room temperature, which takes a long time, resulting in a large loss of heat energy and a long time, which is inefficient.

[0012] Therefore, a method should be invented to solve the problem that the hot pressing mold easily cracks the product and it is difficult to calender the surface of the product during hot pressing drying and shaping.

[0013] In addition, in the production process of plant fiber molded products, if a concave mold is used to absorb slurry, the bottom wall thickness of the formed wet blank will be thicker than the upper part. The deeper the product, the more uneven the wall thickness of the wet blank, and the wet blank is easily cracked. Finally, the wall thickness of the product produced is very uneven and it is easy to form cracked waste products. If a convex mold is used to absorb slurry, the wall thickness of the wet blank of deep products can be made uniform, but when the wet blank is moved to the hot pressing molding device, the hot pressing lower mold must also correspond to the convex mold. When producing deeper products, if the hot pressing lower mold is a convex mold, the product is not easy to demold.

[0014] In this industry, it is a dilemma to have a uniform wall thickness and easy demoulding. Therefore, a method should be invented to solve this problem. Summary of the invention

[0015] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a method for manufacturing pulp molded products and a wet blank secondary transfer pulp molding machine, so that both sides of the plant fiber molded products can obtain better effects.

[0016] After years of research and practice, the inventors have found that (1) the defects of the above-mentioned background technology can be significantly improved by performing secondary pre-pressing and shaping on the wet blank; (2) during hot pressing and shaping, the "mesh surface of the wet blank" can be easily calendered by the "glossy surface of the hot pressing mold", and the "glossy surface of the product" is very smooth; and the "rough surface of the wet blank" can also be easily pressed into a mesh pattern by the "mesh surface of the hot pressing mold", and both sides are ideal.

[0017] The specific ideas of the invention are as follows:

[0018] 1. In the prior art, there is only one wet blank transfer device, while the present invention uses two wet blank transfer devices, namely a first wet blank transfer device and a second wet blank transfer device. When transferring the wet blank, two wet blank transfer devices are used, so that the wet blank can be pre-shaped twice;

[0019] 2. Turn the wet blank 180 degrees, let the "glossy surface of the hot pressing mold" press the "mesh surface of the wet blank", and let the "mesh surface of the hot pressing mold" which is a little flexible and easy to press the overall surface of the wet blank press the "rough surface of the wet blank", which can easily achieve a smooth surface of the product. First, move the wet blank out of the suction filtration molding mold, and after the wet blank leaves the suction filtration molding mold and before it is sent to the hot pressing molding mold, turn the wet blank 180 degrees, and then send it into the hot pressing mold for hot pressing, drying and shaping;

[0020] 3. Only by using two wet blank transfer mold devices and exchanging the wet blanks between the two wet blank transfer mold devices can we truly achieve the "glossy surface of the hot pressing mold" pressing the "net surface of the wet blank" after turning the wet blank 180 degrees.

[0021] The technical solution provided by the present invention is:

[0022] The method for manufacturing pulp molded products is carried out according to the following steps:

[0023] After the wet blank is made in the suction and filtration forming mold, it is transferred to a hot pressing and shaping device for hot pressing, drying and shaping to form a pulp molded product, characterized in that: the transfer is to transfer the wet blank from the suction and filtration forming mold to the hot pressing and shaping device using a first wet blank transfer device and a second wet blank transfer device; wherein the first wet blank transfer device extracts the wet blank from the suction and filtration forming mold and transfers it to the second wet blank transfer device, and the second wet blank transfer device then transfers the wet blank to the hot pressing and shaping device;

[0024] The hot pressing and shaping device may be one or more, wherein the multiple hot pressing and shaping devices include a left hot pressing and shaping device and a right hot pressing and shaping device.

[0025] The second wet blank transfer device moves horizontally along the left and right translation tracks between the hot pressing upper die and the hot pressing lower die, and the hot pressing lower die that can move up and down moves up to extract the wet blank from the second wet blank transfer die; or, the hot pressing upper die that can move up and down moves down to the second wet blank transfer die to extract the wet blank;

[0026] The hot pressing lower mold can be one or more, wherein the multiple hot pressing lower molds include a left hot pressing lower mold and a right hot pressing lower mold; the hot pressing upper mold can be one or more, wherein the multiple hot pressing upper molds include a left hot pressing upper mold and a right hot pressing upper mold; the left hot pressing lower mold corresponds to the left hot pressing upper mold, and the right hot pressing lower mold corresponds to the right hot pressing upper mold.

[0027] The second wet blank transfer mold moves horizontally along the left and right translation tracks to below the first wet blank transfer mold, and the first wet blank transfer mold moves downward to transfer the wet blank extracted from the suction filter molding mold to the second wet blank transfer mold.

[0028] After the first wet blank transfer device transfers the wet blank to the second wet blank transfer device, the second wet blank transfer device turns the wet blank upside down 180 degrees and then transfers it to the hot pressing and shaping device.

[0029] The second wet blank transfer device is driven to move horizontally by the second wet blank transfer device horizontal driver; the second wet blank transfer device horizontal driver adopts a rack and pinion drive mode, and the second wet blank transfer device horizontal driver contains a rack fixed on the upper frame or the lower frame, and a gear power head fixed on the second wet blank transfer device, the gear power head contains a gear and a servo motor that drives the gear to rotate, the gear of the gear power head is meshed with the rack, and the servo motor drives the gear to rotate, thereby driving the second wet blank transfer device to move horizontally left and right; or, the second wet blank transfer device is driven to move horizontally by a linear motor, the mover of the linear motor is fixed on the second wet blank transfer device, and the stator of the linear motor is fixed on the upper frame or the lower frame; or, the second wet blank transfer device is driven to move horizontally by a screw nut sub-mechanism.

[0030] A wet blank secondary transfer type pulp molding machine comprises a suction filtration molding device, a hot pressing shaping device, and also comprises a first wet blank transfer device and a second wet blank transfer device;

[0031] The hot pressing and shaping device may be one or more, wherein the multiple hot pressing and shaping devices include a left hot pressing and shaping device and a right hot pressing and shaping device.

[0032] The first wet blank transfer device contains a first wet blank transfer mold which can move up and down, and the first wet blank transfer mold can extract the wet blank from the suction filtration molding mold. The second wet blank transfer device can move horizontally along the left and right translation tracks to receive the wet blank transferred from the first wet blank transfer mold, and then transfer the wet blank to the hot pressing and shaping device; the left and right translation tracks are fixedly arranged along the left and right directions of the upper frame or the lower frame.

[0033] The hot pressing shaping device comprises a hot pressing lower die that can move up and down, and the left and right translation tracks for the second wet blank transfer die to move horizontally extend to both sides of the hot pressing shaping device, so that the second wet blank transfer die can move above the hot pressing lower die, so as to facilitate the hot pressing lower die to extract the wet blank from the second wet blank transfer die;

[0034] The hot pressing lower mold may be one or more, wherein the multiple hot pressing lower molds include a left hot pressing lower mold and a right hot pressing lower mold.

[0035] The hot pressing shaping device comprises a hot pressing upper die that can move up and down, and the left and right translation tracks for the second wet blank transfer die to move horizontally extend to both sides of the hot pressing shaping device, so that the second wet blank transfer die can move below the hot pressing upper die, so as to facilitate the hot pressing upper die to extract the wet blank from the second wet blank transfer die;

[0036] The hot pressing upper mold may be one or more, wherein the multiple hot pressing upper molds include a left hot pressing upper mold and a right hot pressing upper mold.

[0037] The second wet blank transfer device is equipped with a second wet blank transfer mold that can be turned 180 degrees to turn the wet blank from the first wet blank transfer mold upside down 180 degrees.

[0038] The second wet blank transfer device contains a second wet blank transfer mold that can be flipped 180 degrees up and down around a rotating axis and moved horizontally along a left and right translation track to receive the wet blank transferred from the first wet blank transfer mold, and then flip the wet blank up and down 180 degrees and transfer it to the top of the hot pressing lower mold. The hot pressing lower mold that can move up and down extracts the wet blank that has been flipped from the second wet blank transfer mold.

[0039] The second wet blank transfer device is driven to move horizontally by the second wet blank transfer device horizontal driver, which adopts a rack and pinion drive structure. The second wet blank transfer device horizontal driver contains a rack fixed on the upper frame or the lower frame, and a gear power head fixed on the second wet blank transfer device. The gear power head contains a gear and a servo motor that drives the gear to rotate. The gear of the gear power head is meshed with the rack, and the servo motor drives the gear to rotate, thereby driving the second wet blank transfer device to move horizontally left and right; or, the second wet blank transfer device is driven to move horizontally by a linear motor, the mover of the linear motor is fixed on the second wet blank transfer device, and the stator of the linear motor is fixed on the upper frame or the lower frame; or, the second wet blank transfer device is driven to move horizontally by a screw nut sub-mechanism.

[0040] The working principle of the present invention is as follows: when transferring the wet blank, two wet blank transfer mold devices are used, which greatly increases the flexibility of wet blank processing and realizes secondary pre-shaping of the wet blank; by fine-adjusting the wet blank, the wet blank is more adapted to the cavity gap of the hot pressing mold, thereby reducing the probability of the product being cracked or wrinkled; and only by exchanging the wet blanks between the two wet blank transfer mold devices can the "smooth surface of the hot pressing mold" be pressed against the "net surface of the wet blank" after the wet blank is turned 180 degrees.

[0041] The wet blank after leaving the suction filter forming mold is turned upside down 180 degrees and sent to the hot pressing and shaping device for hot pressing, drying and shaping. The "glossy surface of the hot pressing mold" presses the "net surface of the wet blank" with dense, flat and high-quality materials, while the "net surface of the hot pressing mold" which is a little flexible and easy to press on the overall surface of the wet blank presses the "rough surface of the wet blank". The glossy surface of the hot pressing mold can press the product very smoothly, while the rough surface of the wet blank can easily be pressed into a dense mesh by the net surface of the hot pressing mold. Therefore, both sides of the product can obtain good processing effects, realizing double-sided optimization.

[0042] The beneficial effects of the present invention are:

[0043] 1. The secondary pre-pressing of the wet blank reduces the probability of the product being cracked or wrinkled;

[0044] 2. After turning over 180 degrees, send the wet blank to the hot pressing and shaping device for hot pressing, drying and shaping. Let the "glossy surface of the hot pressing mold" press the "net surface of the wet blank" with dense, flat and high-quality materials, and let the "net surface of the hot pressing mold" with certain flexibility and easy to press the overall surface of the wet blank press the "rough surface of the wet blank", so that both sides of the product can achieve good processing effects and realize double-sided optimization.

[0045] 3. The suction filtration forming mold can use the convex mold to absorb the slurry, while the concave mold of the hot pressing shaping device is under the hot pressing mold. The wet wall thickness of the deep product is uniform, and it is easy to demold by hot pressing. The ideal process effect of uniform wall thickness of the product, easy demolding, and no cracks in the product is achieved;

[0046] 4. The double wet blank transfer device reduces the production difficulty of pulp molded products, especially high-quality exquisite industrial packaging products. It greatly improves the quality of products and the stability of machine operation, and the production cost can be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the lower frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a and the working surface 5M of the second wet blank transfer mold is facing upward).

[0048] Figure 1.1 yes Figure 1 AA section view of the structure.

[0049] Figure 1.2 It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the upper frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a and the working surface 5M of the second wet blank transfer mold is facing upward).

[0050] Figure 1.3 yes Figure 1.2 BB section structure schematic diagram.

[0051] Figure 1.4 It is a partially enlarged schematic diagram of the second wet blank transfer device 5 and the second wet blank transfer device horizontal driver 6 of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the upper frame.

[0052] Figure 2It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the lower frame (the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a, and the second wet blank transfer mold 5a is flipped).

[0053] Figure 2.1 It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the upper frame (the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a, and the second wet blank transfer mold 5a is flipped).

[0054] Figure 3 It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the lower frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a and the working surface 5M of the second wet blank transfer mold is facing downward).

[0055] Figure 3.1 It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the upper frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a and the working surface 5M of the second wet blank transfer mold is facing downward).

[0056] Figure 4 It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the lower frame (a schematic diagram of the state when the second wet blank transfer device 5 with the second wet blank transfer mold working surface 5M facing downward is moved to the top of the left hot pressing lower mold 3Lc).

[0057] Figure 4.1 It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the upper frame (a schematic diagram of the state when the second wet blank transfer device 5 with the second wet blank transfer mold working surface 5M facing downward is moved to the top of the left hot pressing lower mold 3Lc).

[0058] Figure 5 The figure is a schematic diagram of the main structure of the "wet blank secondary transfer pulp molding machine" embodiment 1 of the present invention, in which the left and right translation rails 8 are fixed to the lower frame. The figure expresses the horizontal movement driving mode of the second wet blank transfer device 5, and the servo motor drives the gear rack to drive the second wet blank transfer device 5 to move horizontally.

[0059] Figure 6It is a schematic diagram of the main structure of Example 1 of the "wet blank secondary transfer type pulp molding machine" of the present invention, and the structure of the upper frame 1b changes according to the height change of the hot pressing and shaping device and the first wet blank transfer device.

[0060] Figure 7 It is a schematic diagram of the main structure of Example 2 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 are fixed to the lower frame as described in the present invention (a schematic diagram of the state of the second wet blank transfer device 5 being located below the first wet blank transfer mold 7a, and the second wet blank transfer mold 5a being flipped).

[0061] Figure 7.1 A schematic diagram of the main structure of Example 2 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the upper frame (a schematic diagram of the state in which the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a, and the second wet blank transfer mold 5a is flipped).

[0062] Figure 8 It is a schematic diagram of the main structure of Example 3 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the lower frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a).

[0063] Fig. 9 yes Figure 8 Schematic diagram of the CC section structure.

[0064] Fig.10 It is a schematic diagram of the main structure of Example 3 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the lower frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the left hot pressing upper mold 3La).

[0065] Fig.11 It is a schematic diagram of the main structure of Example 3 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the upper frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a).

[0066] Fig.12 yes Fig.11 DD section structure schematic diagram.

[0067] Fig.13 It is a schematic diagram of the main structure of Example 4 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 of the present invention are fixed to the lower frame (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a).

[0068] Fig.14A schematic diagram of the main structure of Example 4 of the "wet blank secondary transfer pulp molding machine" in which the left and right translation rails 8 are fixed to the upper frame of the present invention (a schematic diagram of the state when the second wet blank transfer device 5 is located below the first wet blank transfer mold 7a).

[0069] Description of the numbers in the figure:

[0070] 1-frame; 1a-lower frame; 1b-upper frame; 1c-pull rod; 2-suction filter forming device; 2a-suction filter forming mold; 2b-suction filter forming slurry tank; 3-hot pressing and shaping device (hot pressing and mold closing device); 3L-left hot pressing and shaping device (left hot pressing and mold closing device); 3R-right hot pressing and shaping device (right hot pressing and mold closing device); 3.1-hot pressing station; 3L.1-left hot pressing station; 3R.1-right hot pressing station; 3a-hot pressing upper mold; 3La-left hot pressing upper mold; 3Ra-right hot pressing upper mold; 3f-hot pressing lower mold driving device; 3Lf-left hot pressing lower mold driving device; 3Rf-right hot pressing lower mold driving device; 3c-hot pressing Lower mold; 3Lc-left hot pressing lower mold; 3Rc-right hot pressing lower mold; 3b-hot pressing upper mold driving device; 3Lb-left hot pressing upper mold driving device; 3Rb-right hot pressing upper mold driving device; 5-second wet blank transfer device; 5.1-rotating shaft; 5a-second wet blank transfer mold; 5b-wet blank turning driver; 5c-second wet blank moving frame; 5M-second wet blank transfer mold working surface; 6-second wet blank transfer device horizontal driver; 6a-gear power head; 6b-rack; 7-first wet blank transfer device; 7a-first wet blank transfer mold; 7b-first wet blank transfer device driver; 8-left and right translation rails; 9-left and right translation rail sliders;

[0071] The hot pressing and shaping device 3 can be one or more (including a left hot pressing and shaping device 3L and a right hot pressing and shaping device 3R), the hot pressing lower mold 3c can be one or more (including a left hot pressing lower mold 3Lc and a right hot pressing lower mold 3Rc), and the hot pressing upper mold 3a can be one or more (including a left hot pressing upper mold 3La and a right hot pressing upper mold 3Ra). DETAILED DESCRIPTION

[0072] The wet blank secondary transfer type pulp molding machine comprises a frame, a suction filtration molding device, a hot pressing shaping device, a first wet blank transfer device, a second wet blank transfer device, a control system (which can use the existing technology), etc. The wet blank is made in the suction filtration molding device, and the made wet blank is transferred to the first wet blank transfer device which can be moved up and down, and then the first wet blank transfer device transfers the wet blank to the second wet blank transfer device which can be moved horizontally, and the second wet blank transfer device transfers the wet blank to the hot pressing and shaping device, and the hot pressing lower mold which can be moved up and down moves up to extract the wet blank from the second wet blank transfer mold 5a; or, the hot pressing upper mold 3a which can be moved up and down moves down to the second wet blank transfer mold 5a to extract the wet blank; after the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left and right translation rails 8, the hot pressing upper mold 3a (including the left hot pressing upper mold 3La and the right hot pressing upper mold 3Ra) and the hot pressing lower mold 3c (including the left hot pressing lower mold 3Lc and the right hot pressing lower mold 3Rc) are combined to perform hot pressing, drying and shaping on the wet blank, and the pulp molded product after hot pressing, drying and shaping is promptly sent out of the pulp molding machine at an appropriate time. In the whole production process of pulp molded products, the wet blank made by the suction filter molding mold 2a in the suction filter molding device is taken away by the first wet blank transfer mold 7a in the first wet blank transfer device and sent to the second wet blank transfer mold 5a in the second wet blank transfer device. The transfer between the first wet blank transfer mold 7a and the second wet blank transfer mold 5a can pre-shape the wet blank. The hot pressing shaping device (including the left hot pressing shaping device and the right hot pressing shaping device) extracts the wet blank from the second wet blank transfer mold 5a, and can pre-shape the wet blank again, thereby reducing the probability of the wet blank being crushed and wrinkled during hot pressing and mold closing; and improving the finished product rate of the product;

[0073] The second wet blank transfer mold in the second wet blank transfer device can have a flipping function. The second wet blank transfer mold can absorb the wet blank and flip it up and down 180 degrees. After the second wet blank transfer mold flips the wet blank up and down 180 degrees with the wet blank, the wet blank is turned upside down so that the mesh surface of the wet blank faces upward. The wet blank with the mesh surface facing upward is transferred to the hot pressing and shaping device for hot pressing, drying and shaping. The hot pressing upper mold as the smooth surface ("the smooth surface of the hot pressing mold") presses the wet blank with the mesh surface facing upward (the "mesh surface of the wet blank") to make a pulp molded product after drying and shaping. Both sides of the product can achieve good processing effects.

[0074] The hot pressing and shaping device can be one or more (for example, a double hot pressing and shaping device including a left hot pressing and shaping device 3L and a right hot pressing and shaping device 3R); the 180-degree upside-down flipping described in the present invention refers to the flipping mold working surface 5M being converted from facing upward to facing downward, or from facing downward to facing upward.

[0075] The "extraction" mentioned above adopts negative pressure adsorption to transfer the wet blank or semi-finished product from one component to another component; this is the prior art.

[0076] According to the different numbers of hot pressing and shaping devices and the different ways of transferring the wet blank to the hot pressing and shaping devices after turning over, the pulp molded product manufacturing method and the wet blank secondary transfer pulp molding machine can have multiple implementation modes, which are specifically described as follows:

[0077] Example 1

[0078] like Figure 1 , Figure 1.2 As shown, in this embodiment, the wet blank secondary transfer type pulp molding machine comprises a frame, a suction and filtration molding device, a hot pressing and shaping device, a first wet blank transfer device, a second wet blank transfer device, a control system, etc. A suction and filtration molding device 2 is arranged in the middle of the lower frame 1a, a first wet blank transfer device 7 is arranged in the middle of the upper frame and above the suction and filtration molding device 2, and a hot pressing and shaping device 3 is arranged on the left and right sides of the frame, respectively, a left hot pressing and shaping device 3L and a right hot pressing and shaping device 3R.

[0079] like Figure 1 , Figure 1.2 As shown, the frame 1 is composed of a lower frame 1a, an upper frame 1b, and a tie rod 1c, and the tie rod 1c fixes the lower frame 1a and the upper frame 1b together. Figure 6 As shown, the structure of the upper frame 1b can be changed according to the height change of the hot pressing shaping device and the first wet blank transferring device.

[0080] The suction filter molding device 2 comprises a suction filter molding mold 2a and a suction filter molding slurry tank 2b; a mixture of plant fiber and water of appropriate concentration (referred to as slurry for short) is intermittently or continuously injected into the suction filter molding slurry tank 2b, and the suction filter molding mold 2a makes the slurry into a wet blank, which can be made in a variety of ways.

[0081] like Figure 1 , Figure 1.2 As shown, the hot pressing and shaping device 3 includes a left hot pressing and shaping device 3L and a right hot pressing and shaping device 3R, and the hot pressing and shaping device includes a hot pressing and shaping mold. The left hot pressing and shaping device 3L includes a left hot pressing lower mold 3Lc that can move up and down, a left hot pressing upper mold 3La fixed on the upper frame, and a left hot pressing lower mold driving device 3Lf. The left hot pressing lower mold 3Lc can move up and down under the drive of the left hot pressing lower mold driving device 3Lf; the right hot pressing and shaping device 3R includes a right hot pressing lower mold 3Rc that can move up and down, a right hot pressing upper mold 3Ra fixed on the upper frame, and a right hot pressing lower mold driving device 3Rf. The right hot pressing lower mold 3Rc can move up and down under the drive of the right hot pressing lower mold driving device 3Rf;

[0082] The left hot pressing lower mold 3Lc and the right hot pressing lower mold 3Rc are collectively referred to as the hot pressing lower mold 3c, and the left hot pressing upper mold 3La and the right hot pressing upper mold 3Ra are collectively referred to as the hot pressing upper mold 3a; and, the left hot pressing lower mold 3Lc only cooperates with the left hot pressing upper mold 3La, and the right hot pressing lower mold 3Rc only cooperates with the right hot pressing upper mold 3Ra.

[0083] The first wet blank transfer device 7 comprises a first wet blank transfer mold 7a and a first wet blank transfer device driver 7b. The suction filter molding mold 2a in the suction filter molding device 2 forms the fiber in the slurry into a wet blank, and the first wet blank transfer mold 7a sucks the wet blank from the suction filter molding mold 2a and raises it to a position, and then transfers the wet blank to the second wet blank transfer device 5.

[0084] like Figure 1 , Figure 1.1 , Figure 1.2 , Figure 1.3 As shown, the second wet blank transfer device 5 includes a second wet blank transfer mold 5a, a wet blank flipping driver 5b, a second wet blank moving frame 5c, and a second wet blank transfer device horizontal driver 6; the mold surface of the second wet blank transfer mold 5a used to adsorb the wet blank is the "second wet blank transfer mold working surface" 5M; the second wet blank transfer mold can flip the wet blank 180 degrees up and down under the drive of the wet blank flipping driver 5b.

[0085] like Figure 1.2 , Figure 1.3 , Figure 1.4 As shown, two (or two groups) of left and right translation rails 8 are fixed on the lower side of the upper frame from the left end to the right end, and the left and right translation rail sliders 9 that can slide along the guide rails are provided on the left and right translation rails 8. The second wet blank transfer device 5 is fixed on the left and right translation rail sliders 9. The second wet blank transfer device 5 is upside down on the lower side of the upper frame through the left and right translation rail sliders 9, and can move left and right along the left and right translation rails 8 under the drive of the second wet blank transfer device horizontal driver 6.

[0086] like Figure 1 , Figure 1.1 As shown, two (or two groups) of left and right translation rails 8 can be fixed from the left end to the right end on the lower frame, and the left and right translation rails 8 are provided with left and right translation rail sliders 9 that can slide along the guide rails. The second wet blank transfer device 5 is fixed on the left and right translation rail sliders 9 and can move left and right along the left and right translation rails 8 under the drive of the second wet blank transfer device horizontal driver 6.

[0087] like Figure 1.1 , Figure 1.3 , Figure 1.4 , Figure 4.1 , Figure 5As shown, the second wet blank transfer device 5 is driven to move horizontally by the second wet blank transfer device horizontal driver 6. As a preferred solution, the second wet blank transfer device horizontal driver 6 adopts a gear rack drive mode, and the second wet blank transfer device horizontal driver 6 contains a gear power head 6a fixed on the second wet blank transfer device 5, and a rack 6b fixed on the lower frame or the upper frame. The gear power head 6a contains a gear and a servo motor that drives the gear to rotate. The gear on the gear power head 6a is meshed with the rack 6b, and the servo motor drives the gear to rotate, thereby driving the second wet blank transfer device 5 to move horizontally left and right. Alternatively, the second wet blank transfer device 5 is driven to move horizontally by a linear motor, the mover of the linear motor is fixed on the second wet blank transfer device 5, and the stator of the linear motor is fixed on the upper frame or the lower frame; or, the second wet blank transfer device 5 is driven to move horizontally by a screw nut pair drive mode;

[0088] The left and right translation rails 8 span the left hot pressing and molding device 3L, the first wet blank transfer device 7, and the right hot pressing and molding device 3R. Driven by the horizontal driver 6 of the second wet blank transfer device, the second wet blank transfer device 5 can move along the left and right translation rails 8 between above the left hot pressing lower mold 3Lc, below the first wet blank transfer device 7, and above the right hot pressing lower mold 3Rc.

[0089] The wet blank is made in the suction filter molding device, and the first wet blank transfer mold 7a moves down to suck up the wet blank from the suction filter molding mold 2a and move it up to its place; the second wet blank transfer mold 5a enters the bottom of the first wet blank transfer mold 7a along the left and right translation tracks 8, and the second wet blank transfer mold 5a turns up and down 180 degrees, so that the working surface 5M of the second wet blank transfer mold faces upward, that is, the working surface 5M of the second wet blank transfer mold faces the first wet blank transfer mold 7a (such as Figure 1 , Figure 1.2 As shown); the first wet blank transfer mold 7a moves down and is closed with the second wet blank transfer mold 5a. After the wet blank is transferred to the second wet blank transfer mold 5a, the first wet blank transfer mold moves up and resets, and the second wet blank transfer mold 5a receives the wet blank. At this time, the working surface 5M of the second wet blank transfer mold and the wet blank face upwards; this process can pre-shape the wet blank.

[0090] like Figure 2.1 , Figure 3.1 , Figure 2 , Figure 3 As shown, after the second wet blank transfer mold turns the wet blank upside down 180 degrees, the wet blank is inverted, with the working surface 5M of the second wet blank transfer mold and the wet blank facing downward (the mesh surface of the wet blank facing upward);

[0091] like Figure 4.1 , Figure 4As shown, the second wet blank transfer mold working surface 5M and the second wet blank transfer mold with the wet blank facing downward move the wet blank to the left above the left hot pressing lower mold in the hot pressing shaping device; the first wet blank transfer mold 7a moves downward again to suck up the wet blank from the suction filtration molding mold 2a and move it up to its place, while the left hot pressing lower mold 3Lc moves upward to take the wet blank from the second wet blank transfer mold 5a and then moves down to its place (this process can also pre-shape the wet blank), and the second wet blank transfer mold 5a moves right along the left and right translation tracks 8 back to the bottom of the first wet blank transfer mold 7a; the second wet blank transfer mold 5a moves right along the left and right translation tracks 8 back to the bottom of the first wet blank transfer mold 7a; The blank transfer mold 5a is turned upside down by 180 degrees, and the working surface 5M of the second wet blank transfer mold is again upwardly directed toward the first wet blank transfer mold 7a. The first wet blank transfer mold 7a moves downward, transfers the wet blank to the second wet blank transfer mold 5a, and then moves upwardly to reset. The second wet blank transfer mold 5a receives the wet blank again, and at the same time, the left hot pressing and shaping device closes the mold to perform hot pressing, drying and shaping on the wet blank. The second wet blank transfer mold turns upside down by 180 degrees with the wet blank, and then turns the wet blank upside down, with the working surface 5M of the second wet blank transfer mold and the wet blank facing downward (the mesh surface of the wet blank facing upward).

[0092] The second wet blank transfer mold working surface 5M and the second wet blank transfer mold with the wet blank facing downward move the wet blank to the right above the right hot pressing lower mold in the hot pressing shaping device; the first wet blank transfer mold 7a moves downward again to suck up the wet blank from the suction filtration molding mold 2a and move it up to its place, and the right hot pressing lower mold 3Rc moves upward to take the wet blank from the second wet blank transfer mold 5a and then moves down to its place (this process can also pre-shape the wet blank), and the second wet blank transfer mold 5a moves left along the left and right translation tracks 8 back to the bottom of the first wet blank transfer mold 7a; the second wet blank transfer mold 5a turns up and down 180 degrees, and the second wet blank transfer mold working surface 5M again moves upward toward the first wet blank transfer mold 7a, the first wet blank transfer mold 7a moves downward, and after the wet blank is transferred to the second wet blank transfer mold 5a, the first wet blank transfer mold moves upward and resets, and the second wet blank transfer mold 5a receives the wet blank, and at the same time, the right hot pressing shaping device closes the mold to perform hot pressing, drying and shaping on the wet blank;

[0093] The smooth surface of the hot pressing upper mold presses the mesh surface of the wet blank to make a pulp molded product after drying and shaping. The product is sent out of the pulp molding machine, and both sides of the product can obtain good processing effects.

[0094] like Figure 1.2 , Figure 2.1 , Figure 3.1 , Figure 4.1 , Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the second wet blank transfer device 5 is provided with a second wet blank transfer mold 5a. There are multiple ways to flip the second wet blank transfer mold 5a 180 degrees. As a preferred solution, the second wet blank transfer mold 5a can be flipped 180 degrees up and down around an axis parallel to the horizontal plane, that is, it can be flipped 180 degrees up and down around the axis to achieve the purpose of flipping the working surface 5M of the second wet blank transfer mold from upward to downward. Figure 1.1 , Figure 1.3 As shown, the wet blank turning driver 5b drives the second wet blank transfer mold 5a to turn 180 degrees. As can be seen from the figure: the rotating shaft 5.1 of the wet blank turning mold is rotatably positioned on the wet blank turning device moving frame 5c through a bearing, the seat of the wet blank turning driver 5b (such as a motor with a reducer) is fixed on one side of the wet blank turning device moving frame 5c, and the driving shaft of the wet blank turning driver 5b (such as a motor output shaft or a reducer output shaft) is coaxially connected to the rotating shaft 5.1; obviously, when the wet blank turning driver is started, the wet blank turning mold can be driven to turn 180 degrees around the rotating shaft 5.1.

[0095] The first wet blank transfer device 7 and the second wet blank transfer device 5 jointly realize the function of transferring the wet blank from the suction filtration molding mold to the hot pressing shaping mold. The coordination of the actions between the first wet blank transfer device 7 and the second wet blank transfer device 5, the upward movement of the left and right hot pressing lower molds to take the wet blank from the second wet blank transfer mold 5a and then move down to the right position can realize two pre-shaping of the wet blank; the 180-degree flipping of the wet blank achieves the purpose of using the "glossy surface of the hot pressing mold" to press the "mesh surface of the wet blank" with dense, flat and high-quality material, and allowing the "mesh surface of the hot pressing mold" with a certain flexibility and easy to press onto the overall surface of the wet blank to press the "rough surface of the wet blank", so that both sides of the product can obtain good processing effects and achieve double-sided optimization.

[0096] The complete implementation process of this embodiment is generally as follows:

[0097] (1) After the wet blank is transferred, the second wet blank transfer mold 5a moves along the left and right translation rails 8 to the bottom of the first wet blank transfer mold 7a; the second wet blank transfer mold 5a turns up and down 180 degrees, and the working surface 5M of the second wet blank transfer mold faces upward to the first wet blank transfer mold 7a. The first wet blank transfer mold 7a moves down to transfer the wet blank to the second wet blank transfer mold 5a and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank, and the second wet blank transfer mold 5a turns up and down 180 degrees with the wet blank, so that the working surface 5M of the second wet blank transfer mold and the adsorbed wet blank face downward, and the mesh surface of the wet blank faces upward.

[0098] (2) The wet blank moves leftward along the left-right translation track 8 to the top of the left hot pressing lower mold 3Lc which can move up and down along with the second wet blank transfer mold 5a; the left hot pressing lower mold 3Lc moves upward to take the wet blank from the second wet blank transfer mold 5a and then moves downward to its position. At the same time, the first wet blank transfer mold 7a moves downward to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and rise to its position.

[0099] (3) After the wet blank is transferred away, the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left-right translation track 8; the second wet blank transfer mold 5a flips up and down 180 degrees, and the working surface 5M of the second wet blank transfer mold again faces upward to the first wet blank transfer mold 7a. The first wet blank transfer mold 7a moves down again to transfer the wet blank to the second wet blank transfer mold 5a and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank again, and the second wet blank transfer mold 5a flips up and down 180 degrees with the wet blank, so that the working surface 5M of the second wet blank transfer mold and the adsorbed wet blank face downward, and the mesh surface of the wet blank faces upward.

[0100] At the same time, the left hot pressing lower mold 3Lc moves up and mates with the left hot pressing upper mold 3La to hot press and dry the wet blank. After hot pressing and drying, the left hot pressing mold opens and the pulp molded product is sent out of the pulp molding machine in time.

[0101] (4) The wet blank moves rightward along with the second wet blank transfer mold 5a to the top of the right hot pressing lower mold 3Rc which can move up and down; the right hot pressing lower mold 3Rc moves upward to take the wet blank from the second wet blank transfer mold 5a and then moves downward to its proper position. At the same time, the first wet blank transfer mold 7a moves downward to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and raise it to its proper position.

[0102] (5) After the wet blank is transferred away, the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a; the second wet blank transfer mold 5a turns up and down 180 degrees, and the working surface 5M of the second wet blank transfer mold again faces upward to the first wet blank transfer mold 7a. The first wet blank transfer mold 7a moves down again to transfer the wet blank to the second wet blank transfer mold 5a and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank again, and the second wet blank transfer mold 5a turns up and down 180 degrees with the wet blank, so that the working surface 5M of the second wet blank transfer mold and the adsorbed wet blank face downward, and the mesh surface of the wet blank faces upward.

[0103] At the same time, the right hot pressing lower mold 3Rc moves up and mates with the right hot pressing upper mold 3Ra to hot press and dry the wet blank. After hot pressing and drying, the right hot pressing mold opens and the pulp molded product is promptly sent out of the pulp molding machine at an appropriate time.

[0104] (6) The wet blank moves leftward along the left-right translation track 8 to the top of the left hot pressing lower mold 3Lc which can move up and down along with the second wet blank transfer mold 5a; the left hot pressing lower mold 3Lc moves upward to take the wet blank from the second wet blank transfer mold 5a and then moves downward to its place. At the same time, the first wet blank transfer mold 7a moves downward to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and rise to its place;

[0105] The wet blank secondary transfer pulp molding machine works cyclically according to the above steps to continuously produce pulp molded products, and the pulp molded products are sent out of the pulp molding machine in time.

[0106] During the entire production process of pulp molded products, the wet blank made by the suction filtration molding mold 2a is taken away by the first wet blank transfer mold 7a and sent to the second wet blank transfer mold 5a, and then turned upside down 180 degrees by the second wet blank transfer mold 5a (the working surface 5M of the second wet blank transfer mold and the adsorbed wet blank face downward, and the mesh surface of the wet blank faces upward) and sent to the left hot pressing and molding device or the right hot pressing and molding device for hot pressing, drying and molding.

[0107] It can realize the double shaping of the wet blank, match the "wet blank mesh surface" with the "glossy surface of the hot pressing mold", and achieve the ideal process effect of uniform wall thickness and easy demoulding. It greatly improves the stability of machine operation, the quality and qualified rate of products, and significantly reduces production costs.

[0108] Example 2

[0109] This embodiment is a simplification of embodiment 1. Figure 7.1 , Figure 7 As shown, the wet blank secondary transfer pulp molding machine of this embodiment only contains one hot pressing and shaping device. In this embodiment, the wet blank secondary transfer pulp molding machine contains a frame 1, a suction and filtration shaping device 2, a hot pressing and shaping device 3, a second wet blank transfer device 5, a first wet blank transfer device 7, a control system, etc.

[0110] Because there is only one hot pressing and shaping device, there is no distinction between a left hot pressing and shaping device and a right hot pressing and shaping device.

[0111] The suction filter forming mold 2a in the suction filter forming device 2 forms the fibers in the slurry into wet blanks, and the first wet blank transfer mold 7a sucks the wet blanks from the suction filter forming mold 2a and raises them to a position;

[0112] The complete implementation process of this embodiment is generally as follows:

[0113] (1) After the wet blank is transferred away, the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left-right translation track 8; the second wet blank transfer mold 5a turns up and down 180 degrees, and the working surface 5M of the second wet blank transfer mold faces upward to the first wet blank transfer mold 7a. The first wet blank transfer mold 7a moves down to transfer the wet blank to the second wet blank transfer mold 5a and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank, and the second wet blank transfer mold 5a turns up and down 180 degrees with the wet blank, so that the working surface 5M of the second wet blank transfer mold and the adsorbed wet blank face downward, and the mesh surface of the wet blank faces upward.

[0114] At the same time, the hot pressing lower mold 3c moves up and mates with the hot pressing upper mold 3a to hot press and dry the wet blank received last time. After hot pressing and drying, the hot pressing mold is opened and the pulp molded product is sent out of the pulp molding machine in time at an appropriate time.

[0115] (2) The second wet blank transfer mold 5a with the wet blank facing downward is moved again to the top of the hot pressing lower mold 3c which can move up and down; the hot pressing lower mold 3c moves upward to take the wet blank from the second wet blank transfer mold 5a and then moves downward to its position. At the same time, the first wet blank transfer mold 7a moves downward to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and rise to its position.

[0116] (3) After the wet blank is transferred away, the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a; the second wet blank transfer mold 5a turns up and down 180 degrees, and the working surface 5M of the second wet blank transfer mold again faces upward to the first wet blank transfer mold 7a. The first wet blank transfer mold 7a moves down again to transfer the wet blank to the second wet blank transfer mold 5a and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank again, and the second wet blank transfer mold 5a turns up and down 180 degrees with the wet blank, so that the working surface 5M of the second wet blank transfer mold and the adsorbed wet blank face downward, and the mesh surface of the wet blank faces upward.

[0117] At the same time, the hot pressing lower mold 3c moves up and mates with the hot pressing upper mold 3a to hot press and dry the wet blank. After hot pressing and drying, the hot pressing mold is opened and the pulp molded product is sent out of the pulp molding machine in time at an appropriate time.

[0118] The wet blank secondary transfer pulp molding machine works in a cycle according to the above steps to continuously produce pulp molded products. In the whole production process of pulp molded products, the wet blank made by the suction and filtration molding mold 2a is taken away by the first wet blank transfer mold 7a and sent to the second wet blank transfer mold 5a. After being turned upside down 180 degrees by the second wet blank transfer mold 5a, it is sent to the hot pressing and shaping device for hot pressing, drying and shaping.

[0119] Example 3

[0120] like Figure 8 , Fig. 9 , Fig.11 , Fig.12As shown, the wet blank secondary transfer pulp molding machine described in this embodiment includes a frame, a suction and filtration molding device, a hot pressing and shaping device, a first wet blank transfer device, a second wet blank transfer device, a control system, etc. Compared with Example 1, the second wet blank transfer mold 5a of this embodiment is fixed on the second wet blank moving frame 5c and does not perform 180-degree flipping up and down; the hot pressing upper mold 3a (left hot pressing upper mold 3La and right hot pressing upper mold 3Ra) can move up and down, and the hot pressing lower mold 3c (left hot pressing lower mold 3Lc and right hot pressing lower mold 3Rc) is fixed.

[0121] The frame 1 is composed of a lower frame 1a, an upper frame 1b, and a pull rod 1c.

[0122] The suction filter molding device 2 includes a suction filter molding mold 2a and a suction filter molding slurry tank 2b.

[0123] The hot pressing shaping device 3 comprises a hot pressing shaping mold; a hot pressing upper mold 3a which can be moved up and down and a hot pressing lower mold 3c which is fixed to the lower frame and does not move; the hot pressing upper mold 3a can be moved up and down under the drive of the hot pressing upper mold driving device 3b;

[0124] The hot pressing and shaping device 3 includes a left hot pressing and shaping device 3L and a right hot pressing and shaping device 3R.

[0125] The left hot pressing shaping device 3L comprises a left hot pressing upper die 3La which can move up and down and a left hot pressing lower die 3Lc which is fixed to the lower frame and does not move. The left hot pressing upper die 3La can move up and down under the drive of the left hot pressing upper die driving device 3Lb.

[0126] The right hot pressing molding device 3R comprises a right hot pressing upper mold 3Ra which can move up and down and a right hot pressing lower mold 3Rc which is fixed on the lower frame. The right hot pressing upper mold 3Ra can move up and down under the drive of the right hot pressing lower mold driving device 3Rb.

[0127] The left hot pressing lower mold 3Lc and the right hot pressing lower mold 3Rc are collectively referred to as the hot pressing lower mold 3c, and the left hot pressing upper mold 3La and the right hot pressing upper mold 3Ra may be the hot pressing upper mold 3a.

[0128] The first wet blank transfer device 7 comprises a first wet blank transfer mold 7a which can be moved up and down, and a first wet blank transfer device driver 7b.

[0129] The second wet blank transfer device 5 comprises a second wet blank transfer mold 5a, a second wet blank moving frame 5c, and a second wet blank transfer device horizontal driver 6. The second wet blank transfer mold 5a is fixed on the second wet blank moving frame 5c and does not need to be flipped 180 degrees up and down.

[0130] like Fig.11 , Fig.12As shown, two (or two groups) of left and right translation rails 8 are fixed on the lower side of the upper frame from the left end to the right end, and the left and right translation rail sliders 9 that can move along the guide rails are provided on the left and right translation rail sliders 9. The second wet blank transfer device 5 is fixed on the left and right translation rail sliders 9. The second wet blank transfer device 5 is upside down on the lower side of the upper frame through the left and right translation rail sliders 9, and can move left and right along the left and right translation rails 8 under the drive of the second wet blank transfer device horizontal driver 6.

[0131] like Figure 8 , Fig. 9 As shown, the left and right translation rails 8 can also be fixed on the lower frame, and two (or two groups) of left and right translation rails 8 are fixed on the lower frame from the left end to the right end. The left and right translation rails 8 are provided with left and right translation rail sliders 9 that can slide along the guide rails. The second wet blank transfer device 5 is fixed on the left and right translation rail sliders 9 and can move left and right along the left and right translation rails 8 under the drive of the second wet blank transfer device horizontal driver 6.

[0132] like Figure 8 , Fig. 9 , Fig.11 , Fig.12 As shown, the second wet blank transfer device horizontal driver 6 drives the second wet blank transfer device 5 to move horizontally. The gear rack drive mode is adopted, and the second wet blank transfer device horizontal driver 6 contains a gear power head 6a fixed on the second wet blank transfer device 5, and a rack 6b fixed on the lower frame or the upper frame. The gear power head 6a contains a gear and a servo motor that drives the gear to rotate. The gear on the gear power head 6a is meshed with the rack 6b, and the servo motor drives the gear to rotate, thereby driving the second wet blank transfer device 5 to move horizontally left and right. Alternatively, the second wet blank transfer device 5 is driven to move horizontally by a linear motor, the mover of the linear motor is fixed on the second wet blank transfer device 5, and the stator of the linear motor is fixed on the upper frame or the lower frame; or, the second wet blank transfer device 5 is driven to move horizontally by a lead screw nut pair drive mechanism;

[0133] The left and right translation rails 8 span the left hot pressing and molding device 3L, the first wet blank transfer device 7, and the right hot pressing and molding device 3R. Driven by the horizontal driver 6 of the second wet blank transfer device, the second wet blank transfer device 5 can move along the left and right translation rails 8 between above the left hot pressing lower mold 3Lc, below the first wet blank transfer mold 7a, and above the right hot pressing lower mold 3Rc.

[0134] The wet blank is made in the suction filter molding device, and the first wet blank transfer mold 7a moves down to suck up the wet blank from the suction filter molding mold 2a and move it up to the position; Figure 8 , Fig.11As shown, the second wet blank transfer mold 5a enters the bottom of the first wet blank transfer mold 7a along the left and right translation track 8, the first wet blank transfer mold 7a moves down and is molded with the second wet blank transfer mold 5a. After the wet blank is transferred to the second wet blank transfer mold 5a, the first wet blank transfer mold moves up and resets. When the first wet blank transfer mold 7a moves down and is molded with the second wet blank transfer mold 5a, the wet blank can be pre-shaped.

[0135] The second wet blank transfer mold 5a receives the wet blank, such as Fig.10 As shown, the second wet blank transfer mold 5a moves with the wet blank to the bottom of the left hot pressing upper mold 3La of the left hot pressing shaping device; at this time, the first wet blank transfer mold 7a moves down again to suck up the wet blank from the suction filtration molding mold 2a and move up to its place, at the same time, the left hot pressing upper mold 3La moves down to take the wet blank from the second wet blank transfer mold 5a and then moves up to its place; the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left and right translation tracks 8; the first wet blank transfer mold 7a moves down again and closes with the second wet blank transfer mold 5a, and after transferring the wet blank to the second wet blank transfer mold 5a, the first wet blank transfer mold moves up and resets, at the same time, the left hot pressing upper mold 3La moves down and closes with the left hot pressing lower mold 3Lc to perform hot pressing drying and shaping on the wet blank; after drying and shaping, the left hot pressing mold is opened, and the pulp molded product is sent out of the pulp molding machine at an appropriate time. When the first wet blank transfer mold 7a moves down and is molded together with the second wet blank transfer mold 5a, the wet blank can be pre-shaped.

[0136] The second wet blank transfer mold 5a receives the wet blank again, and the second wet blank transfer mold 5a moves with the wet blank to the bottom of the left hot pressing upper mold 3Ra of the right hot pressing molding device; at this time, the first wet blank transfer mold 7a moves down again to suck the wet blank from the suction filtration molding mold 2a and move it up to its place, and at the same time, the right hot pressing upper mold 3Ra moves down to take the wet blank from the second wet blank transfer mold 5a and then moves up to its place; the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left and right translation tracks 8; the first wet blank transfer mold 7a moves down again and closes the mold with the second wet blank transfer mold 5a, and after the wet blank is transferred to the second wet blank transfer mold 5a, the first wet blank transfer mold moves up and resets, and at the same time, the right hot pressing upper mold 3Ra moves down and closes the mold with the right hot pressing lower mold 3Rc to perform hot pressing, drying and molding on the wet blank; after drying and molding, the right hot pressing mold opens, and the pulp molded product is sent out of the pulp molding machine at an appropriate time.

[0137] The complete implementation process of this embodiment is generally as follows:

[0138] (1) The second wet blank transfer mold 5a moves along the left and right translation tracks 8 to the bottom of the first wet blank transfer mold 7a, the first wet blank transfer mold 7a moves down to mate with the second wet blank transfer mold 5a, transfers the wet blank to the second wet blank transfer mold 5a, and then moves up to reset;

[0139] (2) The second wet blank transfer mold 5a that receives the wet blank moves leftward along the left and right translation tracks 8 to the bottom of the left hot pressing upper mold 3La that can move up and down; the left hot pressing upper mold 3La moves downward to take the wet blank from the second wet blank transfer mold 5a and then moves upward to its proper position. At the same time, the first wet blank transfer mold 7a moves downward to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and raise it to its proper position.

[0140] (3) The second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left and right translation tracks 8; the first wet blank transfer mold 7a moves down again and mates with the second wet blank transfer mold 5a, transfers the wet blank to the second wet blank transfer mold 5a, and then moves up to reset. At the same time, the left hot pressing upper mold 3La moves down and mates with the left hot pressing lower mold 3Lc to perform hot pressing, drying and shaping on the wet blank. After hot pressing, drying and shaping, the left hot pressing mold is opened, and the pulp molded product is promptly sent out of the pulp molding machine at an appropriate time.

[0141] (4) The wet blank moves rightward along with the second wet blank transfer mold 5a to the bottom of the right hot pressing upper mold 3Ra which can move up and down; the right hot pressing upper mold 3Ra moves downward to take the wet blank from the second wet blank transfer mold 5a and then moves upward to its position. At the same time, the first wet blank transfer mold 7a moves downward to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and rise to its position.

[0142] (5) After the wet blank is transferred away, the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a; the first wet blank transfer mold 7a moves down to transfer the wet blank to the second wet blank transfer mold 5a and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank. At the same time, the right hot pressing upper mold 3Ra moves down and combines with the right hot pressing lower mold 3Rc to perform hot pressing, drying and shaping on the wet blank. After hot pressing, drying and shaping, the right hot pressing mold opens, and the pulp molded product is promptly sent out of the pulp molding machine at an appropriate time.

[0143] The wet blank secondary transfer pulp molding machine operates in a cycle from (2) to (5) according to the above steps, continuously producing pulp molded products, and the pulp molded products are promptly sent out of the pulp molding machine.

[0144] In the whole production process of pulp molded products, the wet blank made by the suction and filtration molding mold 2a is taken away by the first wet blank transfer mold 7a and sent to the second wet blank transfer mold 5a, and the wet blank is pre-shaped by the first wet blank transfer mold 7a and the second wet blank transfer mold 5a, and then the wet blank is sent to the left hot pressing shaping device or the right hot pressing shaping device, and the left hot pressing upper mold 3La or the right hot pressing upper mold 3Ra moves down and closes with the second wet blank transfer mold 5a, and the wet blank can be pre-shaped again, and the left hot pressing upper mold 3La or the right hot pressing upper mold 3Ra moves up and sucks up the wet blank, and when the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a, the left hot pressing upper mold 3La or the right hot pressing upper mold 3Ra moves down with the wet blank and closes with the left hot pressing lower mold 3Lc or the right hot pressing lower mold 3Rc, and the wet blank is hot pressed, dried and shaped. The stability of machine operation, the quality and qualified rate of products are improved, and the effect of reducing production costs is achieved.

[0145] Example 4

[0146] This embodiment is a simplified version of Embodiment 3. Fig.13 , Fig.14 As shown, the wet blank secondary transfer type pulp molding machine of this embodiment only contains one hot pressing and shaping device. Because there is only one hot pressing and shaping device, there is no distinction between the left hot pressing and shaping device and the right hot pressing and shaping device.

[0147] In this embodiment, the wet blank secondary transfer type pulp molding machine comprises a frame 1, a suction filtration molding device 2, a hot pressing and shaping device 3, a first wet blank transfer device 7, a second wet blank transfer device 5, a control system, etc.

[0148] The left and right translation rails 8 span the hot pressing shaping device 3 and the first wet blank transfer device 7. Driven by the horizontal driver 6 of the second wet blank transfer device, the second wet blank transfer device 5 can move along the left and right translation rails 8 between above the hot pressing lower mold 3c and below the first wet blank transfer mold 7a.

[0149] The complete implementation process of this embodiment is generally as follows:

[0150] (1) After the wet blank is transferred away, the second wet blank transfer mold 5a moves along the left and right translation tracks 8 to the bottom of the first wet blank transfer mold 7a, the first wet blank transfer mold 7a moves down to mate with the second wet blank transfer mold 5a, transfers the wet blank to the second wet blank transfer mold 5a, and then moves up to reset, and the second wet blank transfer mold 5a receives the wet blank;

[0151] (2) The second wet blank transfer mold 5a that receives the wet blank moves along the left and right translation rails 8 to the bottom of the hot pressing upper mold 3a that can move up and down; the hot pressing upper mold 3a moves down to take the wet blank from the second wet blank transfer mold 5a and then moves up to its position. At the same time, the first wet blank transfer mold 7a moves down to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and rise to its position.

[0152] (3) After the wet blank is transferred away, the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left and right translation track 8; the first wet blank transfer mold 7a moves down again and mates with the second wet blank transfer mold 5a, transfers the wet blank to the second wet blank transfer mold 5a, and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank again. At the same time, the hot pressing upper mold 3a moves down and mates with the hot pressing lower mold 3c to perform hot pressing, drying and shaping on the wet blank; after hot pressing, drying and shaping, the hot pressing mold is opened, and the pulp molded product is promptly sent out of the pulp molding machine at an appropriate time.

[0153] (4) The wet blank is moved to the bottom of the hot pressing upper mold 3a which can move up and down along with the second wet blank transfer mold 5a; the hot pressing upper mold 3a moves down to take the wet blank from the second wet blank transfer mold 5a and then moves up to its position. At the same time, the first wet blank transfer mold 7a moves down to the suction filter molding device 2 to suck up the wet blank from the suction filter molding mold 2a and rise to its position.

[0154] (5) After the wet blank is transferred away, the second wet blank transfer mold 5a returns to the bottom of the first wet blank transfer mold 7a along the left and right translation track 8; the first wet blank transfer mold 7a moves down again to transfer the wet blank to the second wet blank transfer mold 5a and then moves up to reset. The second wet blank transfer mold 5a receives the wet blank. At the same time, the hot pressing upper mold 3a moves down and combines with the hot pressing lower mold 3c to perform hot pressing, drying and shaping on the wet blank; after hot pressing, drying and shaping, the hot pressing mold is opened, and the pulp molded product is promptly sent out of the pulp molding machine at an appropriate time.

[0155] The wet blank secondary transfer pulp molding machine operates in a cycle from (3) to (4) according to the above steps, continuously producing pulp molded products, and the pulp molded products are promptly sent out of the pulp molding machine.

Claims

1. The method for manufacturing pulp molded products is carried out according to the following steps: After the wet blank is made in the suction filter forming mold, it is transferred to the hot pressing and shaping device for hot pressing, drying and shaping to form a pulp molded product, which is characterized by: The transfer is to transfer the wet blank from the suction filtration forming mold (2a) to the hot pressing and shaping device using a first wet blank transfer device (7) and a second wet blank transfer device (5); wherein the first wet blank transfer device extracts the wet blank from the suction filtration forming mold (2a) and transfers it to the second wet blank transfer device, and the second wet blank transfer device then transfers the wet blank to the hot pressing and shaping device; The number of the hot pressing and shaping devices is one or more, wherein the multiple hot pressing and shaping devices include a left hot pressing and shaping device (3L) and a right hot pressing and shaping device (3R); The second wet blank transfer device (5) moves horizontally along the left and right translation tracks (8) to between the hot pressing upper die and the hot pressing lower die, and the hot pressing lower die (3c) that can move up and down moves up to extract the wet blank from the second wet blank transfer die (5a); or, the hot pressing upper die that can move up and down moves down to the second wet blank transfer die to extract the wet blank; The hot pressing lower mold is one or more, wherein the multiple hot pressing lower molds include a left hot pressing lower mold (3Lc) and a right hot pressing lower mold (3Rc); the hot pressing upper mold (3a) is one or more, wherein the multiple hot pressing upper molds include a left hot pressing upper mold (3La) and a right hot pressing upper mold (3Ra); the left hot pressing lower mold (3Lc) corresponds to the left hot pressing upper mold (3La), and the right hot pressing lower mold (3Rc) corresponds to the right hot pressing upper mold (3Ra); The second wet blank transfer mold (5a) moves horizontally along the left and right translation tracks (8) to below the first wet blank transfer mold (7a), and the first wet blank transfer mold (7a) moves downward to transfer the wet blank extracted from the suction filter molding mold (2a) to the second wet blank transfer mold (5a); After the first wet blank transfer device (7) transfers the wet blank to the second wet blank transfer device (5), the second wet blank transfer device turns the wet blank upside down by 180 degrees and then transfers it to the hot pressing shaping device; The second wet blank transfer device is driven to move horizontally by the second wet blank transfer device horizontal driver (6); the second wet blank transfer device horizontal driver adopts a rack and pinion drive mode, and the second wet blank transfer device horizontal driver contains a rack (6b) fixed on the upper frame or the lower frame, and a gear power head (6a) fixed on the second wet blank transfer device, the gear power head contains a gear and a servo motor that drives the gear to rotate, the gear of the gear power head is meshed with the rack (6b), and the servo motor drives the gear to rotate, thereby driving the second wet blank transfer device to move horizontally left and right; or, the second wet blank transfer device is driven to move horizontally by a linear motor, the mover of the linear motor is fixed on the second wet blank transfer device, and the stator of the linear motor is fixed on the upper frame or the lower frame; or, the second wet blank transfer device is driven to move horizontally by a screw nut sub-mechanism.

2. A wet-batch secondary transfer pulp molding machine, comprising a suction filtration molding device (2) and a hot pressing molding device (3), characterized in that: It also comprises a first wet dough transfer device (7) and a second wet dough transfer device (5); The number of the hot pressing and shaping devices is one or more, wherein the multiple hot pressing and shaping devices include a left hot pressing and shaping device (3L) and a right hot pressing and shaping device (3R); The first wet blank transfer device comprises a first wet blank transfer mold (7a) which can be moved up and down, and the first wet blank transfer mold can extract the wet blank from the suction filter molding mold (2a); the second wet blank transfer device (5) can be horizontally moved along the left and right translation rails (8) to receive the wet blank transferred from the first wet blank transfer mold, and then transfer the wet blank to the hot pressing shaping device; the left and right translation rails (8) are fixedly arranged along the left and right directions of the upper frame or the lower frame; The hot pressing shaping device comprises a hot pressing lower die that can move up and down, and left and right translation tracks (8) for the second wet blank transfer die to move horizontally extend to both sides of the hot pressing shaping device, so that the second wet blank transfer die can move above the hot pressing lower die, so as to facilitate the hot pressing lower die to extract the wet blank from the second wet blank transfer die (5a); The hot pressing lower mold is one or more, wherein the multiple hot pressing lower molds include a left hot pressing lower mold (3Lc) and a right hot pressing lower mold (3Rc); The second wet blank transfer device is provided with a second wet blank transfer mold (5a) capable of 180-degree flipping, so as to flip the wet blank from the first wet blank transfer mold (7a) upside down 180 degrees; The second wet blank transfer device (5) comprises a second wet blank transfer mold (5a) which can be turned upside down 180 degrees around a rotation axis (5.1) and can be moved horizontally along a left-right translation track (8) to receive the wet blank transferred from the first wet blank transfer mold, turn the wet blank upside down 180 degrees and then transfer it to the top of the hot pressing lower mold, and the hot pressing lower mold which can move upside down extracts the turned wet blank from the second wet blank transfer mold; The second wet blank transfer device is driven to move horizontally by the second wet blank transfer device horizontal driver (6), which adopts a gear rack drive structure. The second wet blank transfer device horizontal driver contains a rack (6b) fixed on the upper frame or the lower frame, and a gear power head (6a) fixed on the second wet blank transfer device. The gear power head contains a gear and a servo motor that drives the gear to rotate. The gear of the gear power head is meshed with the rack (6b), and the servo motor drives the gear to rotate, thereby driving the second wet blank transfer device to move horizontally left and right; or, the second wet blank transfer device is driven to move horizontally by a linear motor, the mover of the linear motor is fixed on the second wet blank transfer device, and the stator of the linear motor is fixed on the upper frame or the lower frame; or, the second wet blank transfer device is driven to move horizontally by a screw nut sub-mechanism.

Images