Progressive wake-up high-frequency pressure compacting pipeline and pressure compacting method thereof

Abstract

The present application relates to a kind of progressive wood type high frequency compaction assembly line, including operating equipment and bearing component.The operating equipment includes preheating unit, high-frequency hot pressing unit and water-cooled cold pressing wood unit;High-frequency hot pressing unit includes several high-frequency hot presses, and the moving roller of each high-frequency hot press extends from the inside hot pressing station to the import and export of both sides and is exposed, and the adjacent exposed moving roller is butt joint;Water-cooled cold pressing wood unit includes several water-cooled cold presses, and the moving roller of each water-cooled cold press extends from the inside pressing station to the import and export of both sides and is exposed, and the adjacent exposed moving roller is butt joint;Bearing component is the tray that is placed under the wood board and supports wood board.The assembly line is used by high-frequency hot pressing unit and water-cooled cold pressing wood unit, bearing component, changes the technical problem that prior art needs to press plate clamping pressure retention in the process of production line circulation due to up and down, under the premise of allowing wood board thickness rebound, and process step adjustment is limited, and solve rebound problem.

Description

[0001] Claims 1-7 of this application claim domestic priority to Chinese patent application No. 2024223456747, entitled "A Progressive High-Frequency Compactor Production Line," filed on September 25, 2024. This is based on the fact that the technical solutions of claims 1-7 of this application are clearly described in claims 1-10 of patent application 2024223456747 (September 25, 2024) and in paragraphs [0005-0063] of the specification. Technical Field

[0002] This invention relates to the field of wood board compaction technology, specifically to a progressive high-frequency compaction production line and its compaction method. Background Technology

[0003] High-frequency technology is widely used in wood compaction, offering ideal softening results with short processing times and low energy consumption. However, the high-frequency compression process requires intense pressure on the wood within an extremely short time, leading to significant springback once the pressure is released. Patent application number 201910181348.8, filed on March 11, 2019, describes a high-frequency wood compaction production line. This line employs a "sandwich-style flow structure"—a tightly integrated auxiliary high-frequency softening section, main high-frequency pressing section, and cooling section, along with upper and lower pressure plates—to maintain high pressure throughout the heating and cooling stages, preventing severe springback due to pressure release. Furthermore, the porous upper and lower pressure plates reduce the moisture content of the compacted wood, thus addressing the springback issue. The device for evenly discharging compressed water vapor from the surface of compacted wood, with patent application number 202010100409.6 and application date of February 18, 2020, also discloses a "sandwich-type flow structure" that uses an upper and lower pressure plate to hold the wood board to maintain pressure (thickness), and adds a perforated plate to reduce the moisture content of the compacted wood, thereby solving the problem of springback.

[0004] Furthermore, the technical solutions in patent applications 202010100409.6 (application date: February 18, 2020), 201811573895.2 (application date: December 21, 2018), and 201910181346.9 (application date: March 11, 2019) all employ a "sandwich-type transfer structure." This structure maintains pressure on the wood during processing to address the issue of wood springback. While these solutions address wood springback to some extent, the "sandwich-type transfer structure" used in these devices requires cumbersome operations during pressurization and heating processes to maintain constant pressure on the wood. For example, during high-frequency heating, electrodes within the upper and lower pressure plates need to be energized separately; during cooling, cooling media needs to be connected to both pressure plates; and when gripping the template, the upper pressure plate must be gripped first. This cumbersome loading and unloading process negatively impacts production efficiency and hinders efficient industrial production.

[0005] Based on the aforementioned technical problems, the applicant is committed to developing simpler auxiliary equipment and processes to address the issue of wood board springback and maintain its excellent physical properties. This invention proposes simplifying existing load-bearing components by reducing the number of pressure plates, thereby simplifying equipment and processes and expanding the equipment's applicability. However, given the simplification of load-bearing components, the crucial challenge lies in maintaining the compacted mechanical properties of the wood board and preventing springback through the equipment and processes used. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art. This invention provides a simplified load-bearing component and a progressive high-frequency compaction production line with progressive compression technology.

[0007] This invention is achieved through the following technical solution:

[0008] A progressive high-frequency compaction production line for wood-warming, wherein the operating equipment includes a preheating section, a high-frequency hot pressing section, and a water-cooled cold pressing section connected in sequence.

[0009] The high-frequency hot pressing section includes several high-frequency hot presses. The second moving roller of each high-frequency hot press extends from the internal hot pressing station toward the inlet and outlet on both sides and is exposed. The exposed second moving rollers of adjacent high-frequency hot presses are connected.

[0010] The water-cooled cold pressing section includes several water-cooled cold presses. The third moving roller of each water-cooled cold press extends from the internal pressing station toward the inlet and outlet on both sides and is exposed. The exposed third moving rollers of adjacent water-cooled cold presses are connected.

[0011] The supporting component includes a pallet and a wooden board it supports. When the supporting component is moved by a moving roller conveyor, the thickness direction of the wooden board is not restricted by the operating equipment.

[0012] Preferably, the preheating section includes several preheaters, and the first moving roller of each preheater extends from the internal preheating station toward the inlet and outlet on both sides and is exposed, and the exposed first moving rollers of adjacent preheaters are connected.

[0013] Preferably, the operating equipment further includes a feeding section, a saturated water-cooled pressing section, a first conveying section, a second conveying section, an air-cooled roller conveyor section, a curing roller conveyor section, and a discharging section;

[0014] The feeding section, preheating section, high-frequency hot pressing section, water-cooled cold pressing section, and saturated water-cooled pressing section are arranged sequentially in the forward direction on a first straight line; the air-cooled roller conveyor section, curing roller conveyor section, and unloading section are arranged sequentially in the reverse direction on a second straight line. One side of the first conveying section is located downstream of the saturated water-cooled pressing section, and the other side is located upstream of the air-cooled roller conveyor section; one side of the second conveying section is located downstream of the unloading section, and the other side is located upstream of the feeding section.

[0015] Preferably, the loading section includes a wooden board loading platform, a moving roller conveyor platform, and a wooden board picking mechanism;

[0016] The plank loading platform is connected to the moving roller conveyor platform on one side. The plank loading platform is a translational roller conveyor used to transport planks to the side of the moving roller conveyor platform. The plank picking mechanism is located on the top of the moving roller conveyor platform and extends upstream of the moving roller conveyor platform to the top of the docking side of the plank loading platform. The plank picking mechanism uses a suction cylinder and an air nozzle.

[0017] The unloading section includes an unloading moving roller platform and an unloading pickup mechanism; the unloading pickup mechanism is located at the top of the unloading moving roller platform and extends from the upstream side of the moving roller platform to the upper part of the curing roller section near the downstream side of the moving roller; the downstream end of the curing roller section is connected to the second conveying section; the unloading pickup mechanism uses a suction cylinder and an air nozzle.

[0018] Preferably, the first conveying section is longitudinally arranged on the downstream side of the saturated water-cooled pressing section of the multiple lines, and at the other end of the saturated water-cooled pressing section, it is connected to the upstream roller of the air-cooled roller section, and a mechanical pusher is provided at this end to push the wooden board to the air-cooled roller section; the first conveying section is a longitudinal moving platform used to move the water-cooled wooden board longitudinally to the end connected to the air-cooled roller section.

[0019] The second conveying section is arranged longitudinally and one side is respectively connected to the downstream end of the curing roller section and the side of the feeding section away from the preheating section; a mechanical pusher is provided at the connection point with the side of the feeding section to push the pallet onto the moving roller platform of the feeding section.

[0020] Preferably, a plurality of parallel first straight lines may be provided between the feeding section and the first conveying section, and the preheating section, the high-frequency hot pressing section, the water-cooled cold pressing section and the saturated water-cooled pressing section are sequentially arranged on each first straight line.

[0021] Preferably, the tray has a shallow groove on the side facing the wooden board that matches the shape of the wooden board, and the tray has a water channel along the horizontal and / or vertical direction on the side facing the wooden board, and a water hole that runs through the entire tray is provided at the position of the water channel.

[0022] A second aspect of the present invention discloses a compaction method using the aforementioned progressive high-frequency compaction production line, the method comprising at least the following steps:

[0023] High-frequency hot pressing treatment: The preheated load-bearing components are sequentially put into several hot presses for multiple hot pressings. The compression rate of the wood board increases step by step after each hot press according to the hot pressing sequence. The second time from the end of the hot pressing of the previous hot press to the start of the hot pressing of the next hot press is 20-30 seconds.

[0024] Water-cooled cold-pressing of wood: After hot pressing, the load-bearing components are sequentially fed into several water-cooled cold presses for multiple water-cooled cold pressings. The temperature of the wood decreases step by step after each water-cooled cold press, and the compression rate increases step by step after each water-cooled cold press. The interval between the end of the cold pressing of one water-cooled cold press and the start of the cold pressing of the next water-cooled cold press is 20-30 seconds.

[0025] Preferably, the high-frequency hot pressing step is preceded by a preheating process: the load-bearing component is sequentially preheated in several preheaters, and the first time from the end of preheating in one preheater to the start of preheating in the next preheater is 5 to 20 seconds.

[0026] Compared with the prior art, the beneficial effects of the present invention include:

[0027] 1. The progressive high-frequency compression production line of this invention is a fully automated and efficient production line. Its unique progressive compression equipment—the high-frequency hot pressing section and the water-cooled cold pressing section—combined with simple load-bearing components, allows the wood board thickness to rebound. It changes the technical problem of existing technology, which requires upper and lower pressure plates to hold and maintain pressure, resulting in complicated operation and limited process adjustment during production line flow. It greatly improves production efficiency and truly realizes large-scale, highly automated, lights-out factory production.

[0028] 2. The production line of this invention can be used for compaction of logs and non-logs, with good versatility. Furthermore, the timing and method of heating and pressurizing of the high-frequency hot press equipment in this production line are more flexible, greatly improving the practicality of the production line.

[0029] 3. The "progressive" technology of the progressive high-frequency compaction production line of this invention is as follows: High-frequency hot presses connected in a series at intervals in the high-frequency hot pressing section progressively compress the wood panels. The compression ratio of the wood panels increases gradually at each stage, thereby progressively increasing the temperature and compression rate of the wood. This maximizes the evaporation and removal of moisture from the wood cell walls, increasing the wood density and hardness while reducing the resilience. After high-frequency hot pressing, the wood panels enter a water-cooled cold pressing section where high-pressure water chillers are connected in a series at intervals for gradual pressurization and water cooling. There is no need to maintain pressure between the high-pressure water chillers, making the processing method more flexible.

[0030] 4. In this invention, the material flowing on the production line is a load-bearing component (i.e., the raw wood board placed inside the hot press plate) without an upper pressure plate. This structure facilitates loading and unloading, simplifies the structural complexity of the pressure plate, and eliminates the step of connecting the upper metal pressure plate with the heating or cooling unit of the press, thereby simplifying the operating equipment and process steps. Furthermore, regarding the prevention of rebound, the wood compacted by the progressive equipment of this invention, combined with the load-bearing component and the "progressive" technology, can achieve or even surpass the technical effects of the existing "sandwich-style flow structure" and "traditional high-frequency conditions." Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the progressive high-frequency compaction production line of the present invention.

[0032] Figure 2 This is a schematic diagram of the feeding section of the present invention;

[0033] Figure 3 This is a schematic diagram of the preheating section of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the high-frequency hot-pressing section of the present invention;

[0035] Figure 5 This is a schematic diagram of the water-cooled cold-pressed wood-pressing part of the present invention;

[0036] Figure 6 This is a schematic diagram of the saturated water-cooled pressing section of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the first conveying section of the present invention;

[0038] Figure 8 This is a schematic diagram of the unloading section of the present invention;

[0039] Figure 9 This is a schematic diagram of the moisture content detection unit of the present invention;

[0040] Figure 10 This is a schematic diagram of the structure of the load-bearing component of the present invention. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings:

[0042] The present invention relates to a progressive high-frequency compaction production line, which includes operating equipment and load-bearing components.

[0043] The present invention relates to a progressive compression device unique to the production line design. This device breaks down a high-frequency heating step that should be completed in one go into multiple high-frequency heating sub-steps that are gradually completed at certain time intervals; breaks down a compression and densification step that should be completed in one go into multiple compression and densification sub-steps that are gradually completed at certain time intervals; or breaks down a rapid cooling step that should be completed in one go into multiple rapid cooling steps that are gradually completed at certain time intervals.

[0044] In one specific example, the operating device includes a preheating section, a high-frequency hot pressing section, and a water-cooled cold pressing section connected in sequence.

[0045] The high-frequency hot pressing section includes several high-frequency hot presses. The second moving roller of each high-frequency hot press extends from the internal hot pressing station toward the inlet and outlet on both sides and is exposed. The exposed second moving rollers of adjacent high-frequency hot presses are connected.

[0046] The water-cooled cold pressing section includes several water-cooled cold presses. The third moving roller of each water-cooled cold press extends from the internal pressing station toward the inlet and outlet on both sides and is exposed. The exposed third moving rollers of adjacent water-cooled cold presses are connected.

[0047] The supporting component includes a tray and the wooden board it supports. When the supporting component is moved by the moving roller conveyor, the thickness direction of the wooden board is not constrained by the operating equipment. This means that, compared to existing technologies where the wooden board needs to be clamped by upper and lower pressure plates to maintain its thickness under compression, no upper pressure plate is added during the transfer process, and there is no need to maintain constant compression in the thickness direction.

[0048] In another complete pipeline example, refer to Figure 1As shown, the operating equipment includes a feeding section 1, a preheating section 2, a high-frequency hot pressing section 3, a water-cooled cold pressing section 4, a saturated water-cooled pressing section 5, a first conveying section 6, an air-cooled roller conveyor section 7, a curing roller conveyor section 8, a unloading section 9, and a second conveying section 10, which are installed in sequence according to the wood board pressing steps of the present invention to form a complete production line.

[0049] Figure 1 In the example, while ensuring the automation of the process operation, a more reasonable technical solution for setting up each operating device is as follows: the feeding section 1, preheating section 2, high-frequency hot pressing section 3, water-cooled cold pressing section 4, and saturated water-cooled pressing section 5 are arranged sequentially in a forward direction on a first straight line; the air-cooled roller conveyor section 7, curing roller conveyor section 8, and unloading section 9 are arranged in a reverse direction on a second straight line on one side of the first straight line. The first and second straight lines are two parallel lines of the same length. The first conveying section 6 serves as a guiding and turning device, with one side located downstream of the saturated water-cooled pressing section 5 and the other side located upstream of the air-cooled roller conveyor section 7. The second conveying section 10 serves as another guiding and turning device, with one side located downstream of the unloading section 9 and the other side located upstream of the feeding section 1.

[0050] The supporting component is a tray 100 placed under the wooden board to support the wooden board. Figure 10 As shown, structurally, the tray 100 has a shallow groove 113 on the side facing the wooden board. The shape of the shallow groove 113 is adapted to the shape of the wooden board, which can limit the wooden board and prevent it from shifting to a certain extent. A water channel 110 is provided on the surface of the shallow groove 113 along the transverse and / or longitudinal direction, and a water inlet 114 penetrating the entire tray 100 is provided at the position of the water channel 110. The pressure borne by the tray 100 is set according to the working pressure of the pressing machine on the production line; in one example, the pressure borne by the tray 100 is converted to: 2300T (tons) / 1.75 square meters, i.e., kg / cm². 2 The material can be converted based on this, such as stainless steel or alloy steel; this invention does not limit the type of material.

[0051] The following is a detailed description of each operating device according to the flow direction of the production line.

[0052] Figure 2 As shown, the loading section 1 includes a wooden board loading platform 12, a moving roller conveyor platform 11, and a wooden board picking mechanism 13. One side of the wooden board loading platform 12 is connected to the moving roller conveyor platform 11. The wooden board loading platform 12 is a translational roller conveyor used to transport wooden boards to the side of the moving roller conveyor platform 11. The wooden board picking mechanism 13 is located on the top of the moving roller conveyor platform 11 and extends upstream of the moving roller conveyor platform 11 to above the connecting side of the wooden board loading platform 12.

[0053] It should be noted that the wood board picking mechanism 13 can be a robotic arm or a suction mechanism; preferably, a suction mechanism is used. The suction mechanism includes a suction cylinder and a suction nozzle located at the output end of the suction cylinder. During operation, the suction cylinder controls the suction nozzle to suction and release the wood board. The moving roller platform 10 is a translational roller conveyor, on which a tray 100 is placed. After the wood board picking mechanism 13 grabs the wood board, it moves above the tray 100 and releases the wood board onto the tray 100. The wood board and the tray 100 form a load-bearing component. One side of the moving roller platform 10 is connected to the preheating section 2, and a mechanical pusher is provided to push the load-bearing component to the preheating section 2 for preheating. In an improved example, to make the height of the wood board adaptable to the suction mechanism, a lifting platform is also provided under the loading station of the wood board loading platform 10, which is used to raise the wood board to be picked up to a suitable height for picking.

[0054] To improve the production efficiency of wood board compaction, the production line of this invention adopts multiple lines set up in parallel. Figure 1 As shown, multiple lines are arranged in parallel from the moving roller conveyor platform 10 of the feeding section 1 on their upstream sides. Each line is respectively equipped with a preheating section 2, a high-frequency hot pressing section 3, a water-cooled cold pressing section 4, and a saturated water-cooled pressing section 5.

[0055] The preheating section 2 on each line employs several preheaters connected in series. The preheaters can be existing thermal oil preheaters, steam preheaters, or high-frequency preheaters, with high-frequency preheaters being preferred. In an improved embodiment, the first moving roller conveyor of the preheater extends from the internal preheating station towards the inlet and outlet on both sides and is exposed, with the exposed first moving roller conveyors of adjacent preheaters docking; the exposed first moving roller conveyors provide intermittent pressure relief channels for the load-bearing components during the flow process, better realizing pressure relief of the load-bearing components between the current pressurization equipment and the next pressurization equipment.

[0056] Figure 3 A specific example is shown, where the preheating unit 2 includes two high-frequency preheaters 201 and 202 connected in series. The two high-frequency preheaters 201 and 202 sequentially apply a first pressure to the bearing member and preheat the wooden board in the bearing member using high frequency before conveying it to the high-frequency hot pressing unit 3. The bearing member is released from the first pressure within a first time period after either high-frequency preheater 201 or 202 stops pressurizing. The first time period is defined as the start point of the current preheating unit's stop pressurization (providing a compression ratio) and the end point of the next unit's start pressurization (providing a compression ratio). Preferably, the first time period is 5-20 seconds.

[0057] Each high-frequency hot pressing section 3 on each line employs several high-frequency hot presses connected in series. The second moving roller conveyor of each high-frequency hot press extends from its internal hot pressing station towards the inlet and outlet on both sides and is exposed. The exposed second moving roller conveyors of adjacent high-frequency hot presses are connected. The heating temperature and working pressure parameters within each high-frequency hot press are determined based on the compression rate achieved by the wood board within that press, and the wood board compression rate achieved by the high-frequency hot presses from upstream to downstream increases progressively. The number of high-frequency hot presses is set according to actual conditions. In one example, Figure 4 As shown, preferably, three high-frequency hot presses 301, 302, and 303 are used, with their operating temperatures (the heating temperature applied to the wood board during operation) increasing progressively from the upstream side to the downstream side. The operating pressures of the three high-frequency hot presses 301, 302, and 303 are the same. The three high-frequency hot presses 301, 302, and 303 sequentially apply a second pressure to the supporting component and heat the wood board in the supporting component using high frequency before conveying it to the water-cooled cold-pressed wood section 4. The second pressure is released from the supporting component within a second time period after any one of the high-frequency hot presses 301, 302, or 303 stops pressurizing. The first time period is the starting point of the current hot pressing unit's stop pressurization (providing a compression ratio) and the ending point of the next unit's start pressurization (providing a compression ratio). Preferably, the second time period is 10-30 seconds. The first high-frequency hot press 301 operates at a temperature of 200℃, the second high-frequency hot press 302 operates at a temperature of 250℃, and the third high-frequency hot press 303 operates at a temperature of 300℃. The operating pressure of the three high-frequency hot presses 301, 302, and 303 is 2300T (tons). By setting the operating parameters of each high-frequency hot press, the gradual compression of the wood board is achieved.

[0058] The key feature of this progressive technology is that, unlike existing technologies where each equipment unit is tightly connected and requires upper and lower positioning rollers to maintain pressure during the movement of the wooden board, this invention features exposed connecting roller tracks between equipment units. Furthermore, positioning rollers are not needed at intervals. After the previous equipment stops applying pressure, the wood fibers within the wooden board undergo a suitable amount of rebound before the next pressurization. Through repeated progressive pressure application and release in the high-frequency hot-pressing section, the wood fiber structure within the template is repeatedly disrupted, thereby reducing its resilience (i.e., springback).

[0059] The main chemical components of wood are cellulose, hemicellulose, and lignin (the three major elements). If cellulose, hemicellulose, and lignin form a large number of hydrogen bonds in compacted wood, the compacted wood is less prone to rebound compared to other types of wood. In the progressive high-frequency compaction production line of this invention, due to the inclusion of multiple high-frequency heating sub-steps, multiple compression compaction sub-steps, and / or multiple rapid cooling steps, cellulose molecules, hemicellulose molecules, and lignin molecules can intertwine and extend multiple times, forming a greater number of hydrogen bonds between them. In addition, the microstructure of the three major elements is more tightly interwoven, which can better lock in water molecules. This allows the high-frequency compacted wood to better resist the destruction of hydrogen bonds by moisture when it absorbs moisture, achieving the technical effect of avoiding wood rebound without the need for a pressure plate.

[0060] On the other hand, the progressive compression technology of this invention uses a series of high-frequency hot presses connected in a high-frequency hot pressing section to progressively compress the wood panels. The compression ratio of the wood panels increases step by step, thereby gradually increasing the temperature and compression rate of the wood. This maximizes the evaporation and removal of moisture from the wood cell walls, increasing the density and hardness of the wood while reducing its resilience. Simultaneously, because its load-bearing components omit the clamping constraints of the upper pressure plate, it provides conditions for flexible adjustment of the hot pressing process. For example, the high-frequency hot press can be used for high-frequency pressurization and heating simultaneously or separately, depending on the process requirements.

[0061] Both the high-frequency preheating machine of the preheating section 2 and the high-frequency hot press of the high-frequency hot pressing section 3 have a pressing mechanism and a heating mechanism. The pressing mechanism includes an upper template and a lower template disposed at the preheating station and the hot pressing station. The pressing mechanism and heating mechanism of the hot press are conventional means in the art, and therefore will not be described in detail with accompanying drawings. For specific structures, please refer to the relevant technical solutions disclosed in the applicant's prior patent application No. 201811592197.7.

[0062] Each water-cooled cold-pressing section 4 on each production line employs several water-cooled cold presses. The third moving roller conveyor of each water-cooled cold press extends from the internal pressing station towards the inlet and outlet on both sides and is exposed. The exposed third moving roller conveyors of adjacent water-cooled cold presses are joined together, allowing the wood boards to undergo intermittent pressure release on the joined exposed third moving roller conveyors. The heating temperature and working pressure parameters within each water-cooled cold press are determined based on the compression rate achieved by the wood boards within that corresponding water-cooled cold press, and the compression rate of the wood boards achieved by several water-cooled cold presses from the upstream side to the downstream side increases progressively. Low-temperature water-cooling equipment is installed at the high-frequency pressing station of each water-cooled cold press in this section to cool the load-bearing components. Figure 5The water-cooled cold-pressing section 4 shown employs four water-cooled cold presses 401, 402, 403, and 404. Each of the four water-cooled cold presses 401, 402, 403, and 404 is equipped with a low-temperature water-cooling device. The four water-cooled cold presses 401, 402, 403, and 404 operate at the same pressure, which is also the same as the operating pressure of the three high-frequency hot presses 301, 302, and 303. In a preferred embodiment, the operating pressure of the four water-cooled cold presses 401, 402, 403, and 404 is 2300 tons.

[0063] The saturated water-cooled pressing section 5 on each line uses several water-cooled pressing machines connected in series. The water-cooled pressing machines can be water-cooled machines commonly used in this field. Figure 6 In one example shown, the saturated water-cooled pressing section 5 employs eight water-cooled pressing machines connected in series. Adjacent water-cooled pressing machines are connected to the same pressing power source, and every four water-cooled pressing machines are supplied with water from the same water chiller. In a preferred embodiment, the working pressure of the eight water-cooled pressing machines is 60T (tons).

[0064] Figure 6 In the example, the saturated water-cooled pressing section 5 has a pressing mechanism and a water chiller. The technical means of the pressing mechanism and the water chiller are conventional means in the art, so they are not described in detail with accompanying drawings.

[0065] Figure 7 As shown, the first conveying section 6 is longitudinally arranged downstream of the saturated water-cooled pressing section 5 along multiple lines. Simultaneously, at the other end of the saturated water-cooled pressing section 5, it connects to the upstream roller conveyor of the air-cooled roller conveyor section 7, and a mechanical pusher is provided at this end to push the wooden board to the air-cooled roller conveyor section 7. The first conveying section 6 is a longitudinally moving platform used to longitudinally move the water-cooled wooden board to the end connected to the air-cooled roller conveyor section 7.

[0066] The air-cooled roller conveyor section 7 is composed of multiple air-cooling units connected in series on the air-cooled moving roller conveyor; preferably ten units.

[0067] Figure 8 As shown, the unloading section 9 includes an unloading moving roller platform 90 and an unloading pickup mechanism. The unloading pickup mechanism is located at the top of the unloading moving roller platform 90 and extends upstream of the moving roller platform to above the moving roller of the curing roller section 8 near the downstream side. The unloading pickup mechanism can be a robotic arm or a suction mechanism, the specific structure of which is as described above. The downstream end of the curing roller section 8 connects with the second conveying section 10 to transport the unloaded pallet to the upstream side of the production line.

[0068] The second conveying section 10 is arranged longitudinally and one side is respectively connected to the downstream end of the curing roller section 8 and the side of the feeding section 1 away from the preheating section 2; a mechanical pusher is provided at the connection point with the side of the feeding section 1 to push the pallet to the moving roller platform of the feeding section 1 for waiting for the next cycle of wood board feeding.

[0069] All moving roller conveyors on the entire production line use conveyor rollers for transport.

[0070] Based on the aforementioned production line equipment, the preheating interval between each high-frequency preheater in the preheating section is 5-10 seconds via exposed roller conveyors; the interval between each high-frequency hot press in the high-frequency hot pressing section is 20-30 seconds; and the interval between each water-cooled cold press in the water-cooled cold pressing section is also 20-30 seconds. The high-frequency hot pressing section includes three high-frequency hot presses, each with equal hot pressing intervals, and the temperature and compression rate of the wood are progressive. This invention does not specifically limit the magnitude of the gradual increase in temperature and compression rate. The water-cooled cold pressing section includes four water-cooled cold presses, each with equal cold pressing intervals, and the compression rate of the wood is progressive. Through the above equipment, the compression ratio is gradually increased during the wood compaction process, achieving a gradual increase in the temperature and compression rate of the wood. Even without the clamping of the upper pressure plate, the moisture in the wood cell walls can still be evaporated and discharged to the maximum extent, preventing springback.

[0071] In this invention, the production line uses a load-bearing component (i.e., the raw wooden board placed in a hot-pressing tray) without an upper pressure plate. This design offers advantages in two ways: firstly, it facilitates loading and unloading; secondly, it simplifies the structural complexity of the pressure plate, eliminating the need for connection to the press's heating or cooling units. Because there is no upper pressure plate, according to conventional understanding in existing technology, it is impossible to "maintain pressure" between equipment units (the upper surface of the wooden board cannot be directly passed through the "roller group"), which would be detrimental to preventing rebound. Surprisingly, even without an upper pressure plate, the progressive compaction step of this invention, combined with the "progressive" compaction technology, achieves, or even surpasses, the technical effects of the existing "sandwich-style flow structure" (the wooden board sandwiched between upper and lower pressure plates, with the hot-pressing tray acting as the upper and lower pressure plates) and "traditional high-frequency conditions" in preventing rebound.

[0072] Furthermore, the "hot press plate flow structure" of this invention is not limited by the upper pressure plate, so its production adaptability is wider. It can be applied to logs, such as poplar, birch and other types of wood, as well as non-logs.

[0073] In this invention's progressive compaction technology, the compression rate of the wood board at each stage is strictly limited. Therefore, thickness measurement sensors are installed at various machine unit locations in the preheating section, high-frequency hot pressing section, and water-cooled cold pressing section to measure the wood board thickness. Furthermore, measuring the wood board thickness before preheating is particularly crucial. In some improved examples, such as... Figure 9 As shown, an upstream section of the feeding part of the production line is also provided with a moisture content measuring unit 80, which is equipped with a moisture content measuring instrument for testing the moisture content of the wood and a thickness measuring sensor for measuring the thickness of the template. The moisture content measuring unit 80 consists of a roller conveyor section assembly and measuring instruments mounted on the roller conveyor section assembly. The roller conveyor section assembly includes a testing section 82, a sorting section 83, an NG product output section 84, and an OK product output section 85.

[0074] The test section 82 is a longitudinal roller conveyor belt located upstream of the sorting section 83. A microwave moisture meter antenna 86, a thickness sensor 87, and a width encoder 88 are mounted on the roller side of the test section 82 via a measuring bracket. The sorting section 83 is a transverse roller conveyor belt, while the NG (Not Good) output section 84 and the OK (Good) output section 85 are both longitudinal roller conveyor belts. The downstream side of the sorting section 83 is connected to the preheating section. A length encoder 89 is installed at the upstream end of the sorting section 83 corresponding to the test section 82, used to measure the length of the passing timber. A lifting clamping roller is also provided at the upstream end of the sorting section 83 to clamp the timber from upstream of the sorting section 83 to the middle section. The NG product output section 84 is provided on the upstream side of the sorting section 83, and the OK product output section 85 is provided on the downstream side of the sorting section 83; the sorting section 83 is provided with lifting pushers at the positions corresponding to the NG product output section 84 and the OK product output section 85, which are used to push the wooden boards of the corresponding quality to the corresponding output section.

[0075] The measurement process of the moisture content measuring unit 80 includes: 1. Measuring the moisture content; 2. Measuring the thickness using a thickness measuring sensor; 3. Measuring the width using a width measuring encoder when the thickness measuring sensor is in position; 4. Measuring the length at the position of the lifting pinch roller; 5. Calculating the moisture content using the values ​​from steps 2-4; 6. Classifying the product into NG (Not Good) and OK (Good) products based on the moisture content value.

[0076] It should be added that the "high-frequency compaction method" of this invention is a wood strengthening treatment method that uses high-frequency voltage to heat the wood, compresses the wood as a whole at a certain compression rate, and rapidly cools the wood under certain low-temperature conditions. The compressed and strengthened wood is called high-frequency compacted wood. This "high-frequency compaction method" uses a high-frequency medium heating device (applying high-frequency voltage) to heat the wood, a hydraulic press (applying a compression rate) to compress the wood as a whole, and a cooling device (providing a temperature medium such as water) to rapidly cool the wood (natural cooling using air as the temperature medium is also possible). In this production line equipment structure, the heating, compaction, and cooling steps can be performed simultaneously or separately, depending on the situation. When the high-frequency heating and compression compaction steps are performed simultaneously, the same high-frequency medium hot press can be used. When the high-frequency heating and compression compaction steps are not performed simultaneously, the compression compaction step can be performed separately in a cold press. When the compression compaction and rapid cooling steps are performed simultaneously, the same water-cooled cold press can be used. When the compression compaction and rapid cooling steps are not performed simultaneously, the rapid cooling step can be performed separately by a water-cooling device. The high-frequency heating step includes softening, heating to a higher temperature, or heating to cure, depending on the specific high-frequency compaction process for the wood. Softening is usually to increase the plasticity of the wood, while curing and rapid cooling (quenching) are usually to enhance the physical properties of the high-frequency compacted wood.

[0077] Based on the above-mentioned technical solution for realizing a progressive structure through a production line, the third aspect of this invention discloses a progressive high-frequency compaction method, the method comprising at least the following steps:

[0078] High-frequency hot pressing treatment: The preheated load-bearing components are sequentially put into several hot presses for multiple hot pressings. The compression rate of the wood board increases step by step after each hot press according to the hot pressing sequence. The second time from the end of the hot pressing of the previous hot press to the start of the hot pressing of the next hot press is 20-30 seconds.

[0079] Water-cooled cold-pressing of wood: After hot pressing, the load-bearing components are sequentially fed into several water-cooled cold presses for multiple water-cooled cold pressings. The temperature of the wood decreases step by step after each water-cooled cold press, and the compression rate increases step by step after each water-cooled cold press. The interval between the end of the cold pressing of one water-cooled cold press and the start of the cold pressing of the next water-cooled cold press is 20-30 seconds.

[0080] In an improved embodiment, a preheating process is included before the high-frequency hot pressing step: the load-bearing component is sequentially preheated in several preheaters, and the first time from the end of preheating in one preheater to the start of preheating in the next preheater is 5 to 20 seconds.

[0081] In one improved scheme, after the wood boards undergo water-cooled cold pressing and warming treatment, saturated water-cooled pressing, air cooling, and curing steps are performed.

[0082] It should be noted that the compression rate mentioned in this invention refers to the percentage of the log after compression treatment, that is... In this application, the term "log" as used for compression ratio refers to logs cut before preheating treatment. The compression ratio described in this invention refers to the percentage of logs after compression treatment. In this application, the term "log" in the compression ratio refers to logs cut before preheating treatment.

[0083] Based on the above-mentioned method principle, the following examples will provide a detailed explanation of the progressive high-frequency compaction method.

[0084] Example 1

[0085] Cut logs into planks of suitable size; the log density is 0.5-0.6 g / cm³. 3 The average moisture content is controlled to be around 10%. The wooden boards are placed in the shallow groove of the tray to form a supporting component. The supporting component is then placed in the progressive high-frequency compaction production line of this invention for the following process steps:

[0086] 1) Preheating treatment: The load-bearing components are preheated in a preheating equipment to a temperature of 100-130℃ for 20-30 seconds, and the compression rate of the wood board is 15-25%.

[0087] 2) High-frequency hot pressing treatment: The preheated load-bearing components are sequentially placed into three hot presses for hot pressing. The components are then sequentially heated to 140-160℃ and held for 2-4 minutes, heated to 160-180℃ and held for 2-4 minutes, and heated to 180-200℃ and held for 1.5-3 minutes. The pressure of each press is 2300T. The compression rate of the wood boards increases progressively after each hot press, with compression rates of 30-40%, 40-50%, and 50-60%, respectively. The second time interval between the end of hot pressing in one press and the start of hot pressing in the next press is 20-30 seconds.

[0088] 3) Water-cooled cold-pressing treatment of the wood: After hot pressing, the load-bearing components are placed in four water-cooled cold presses for cold pressing. Each water-cooled cold press is used for cold pressing for 3-6 minutes in sequence. The temperature of the wood boards decreases step by step after each water-cooled cold press, with the temperatures after each cold press being 160-180℃, 140-160℃, 120-140℃, and 100-120℃ respectively. The pressure of each water-cooled cold press is 2300T (tons). The compression rate of the wood boards increases step by step after each water-cooled cold press, with the compression rate increasing by 3-5% at each level. The third time interval between the end of the cold pressing of one water-cooled cold press and the start of the cold pressing of the next water-cooled cold press is 20-30 seconds.

[0089] 4) Saturated water-cooled pressing: The load-bearing components after cold pressing are put into the water-cooled pressing equipment line for cold pressing and curing. The equipment pressure is 60T, the processing time is 25-35min, and the wood board is cooled to an average temperature of 70-80℃.

[0090] Example 2

[0091] The steps are the same as in Example 1, except for the preheating treatment in step 1). The improved process steps are as follows:

[0092] 1) Preheating treatment: The load-bearing components are sequentially preheated in three preheating machines, which are respectively heated to 80-90℃ and held for 8-12s, 100-110℃ and held for 8-12s, and 120-130℃ and held for 4-6s. The compression rate of the wood board increases step by step after each preheating machine according to the hot pressing sequence. The compression rates of the wood board are 15-20%, 20-25%, and 25-30%, respectively. The first heating interval between adjacent high-frequency preheating machines is 5-20 seconds.

[0093] According to the method of Embodiment 2 above, the wood is compacted according to the specific parameter settings below. The wood temperature mentioned below refers to the temperature at which the wood is heated in the equipment to the set temperature.

[0094] Table 1. Parameters of the progressive high-frequency compaction method using log-making provided in Examples 2-1, 2-2, and 2-3.

[0095]

[0096]

[0097] Example 3

[0098] The progressive high-frequency compaction method, based on the steps of Example 2, further includes the following steps:

[0099] 5) Air cooling treatment: The wood boards after saturated water cooling and pressing are treated with air cooling technology. The surface temperature of the wood boards after air cooling is below 60℃, the air temperature is 10℃-15℃, and the wind speed is 20m / s-25m / s.

[0100] 6) Curing treatment: Transfer the air-cooled load-bearing components to the curing equipment and balance them at room temperature for 11-13 days.

[0101] Controlled Experiment Example 1

[0102] Compacted wood is prepared according to steps 1)-4) of the method described in Example 2. The difference is that the equipment for the preheating treatment, high-frequency hot pressing treatment and water-cooled cold pressing wood-awakening treatment steps is not connected in series with gaps. After each equipment is processed, it directly enters the next equipment without any space for separation. The parameters used in the equipment are the same as those described in Example 1-1.

[0103] The specific process steps 1)-4) are as follows:

[0104] 1) Preheating treatment: The load-bearing components are sequentially preheated by three high-frequency preheaters connected in series without gaps. The high-frequency heating is maintained for 20 seconds until the temperature of the wood board reaches 120-130℃, resulting in a compression rate of 30%.

[0105] 2) High-frequency hot pressing treatment: The preheated load-bearing components are sequentially put into three hot presses connected in series without gaps for hot pressing. High-frequency pressure is applied and maintained for 8 minutes, and the temperature of the wood board reaches 180-200℃. The pressure of each equipment is 2300T (tons), which makes the compression rate of the wood board 60%.

[0106] 3) Water-cooled cold-pressing treatment of wood: The load-bearing components after hot pressing are put into four water-cooled cold presses connected in series without gaps for cold pressing. The high-frequency water cooling is maintained for 8 minutes, and the temperature of the wood board reaches 100-120℃. The pressure of each equipment is 2300T (tons), which makes the compression rate of the wood board 72%.

[0107] 4) Saturated water-cooled pressing: The load-bearing components after cold pressing are put into the water-cooled pressing equipment line for cold pressing and curing. The equipment pressure is 60T, the processing time is 25-35min, and the wood board is cooled to an average temperature of 75℃.

[0108] Example 4

[0109] The method described in Example 1 of CN 111421633 A (publication date: July 17, 2020) is used to process the load-bearing member of this invention, except that steps 2) "heating and compression treatment", 3) "curing treatment", and 4) "cooling treatment" are performed in a progressive manner in the production line equipment of this invention. It should be noted that the number of high-frequency hot presses is adjusted and set on the production line according to the steps required. The specific method is as follows:

[0110] 1) Pretreatment: The wood boards with a density of ρ = 0.6 are pretreated to control the average moisture content of the wood boards to 10%. The wood boards are then placed in the shallow groove of the pallet to form a load-bearing component.

[0111] 2) Heat compression treatment: The pre-treated load-bearing components are sequentially put into three high-frequency hot presses for hot pressing, and are respectively heated at 100℃ for 2.5 min, heated at 100℃ for 2.5 min, and heated at 100℃ for 2 min, with an interval of 20 seconds between adjacent high-frequency heating sub-steps; the compression rates of the wood boards are 41%, 43%, and 45%, respectively.

[0112] 3) Curing treatment: The hot-pressed load-bearing components are sequentially put into three high-frequency hot presses for hot pressing, and are respectively subjected to high-frequency heating at 180℃ and held for 3 minutes, high-frequency heating at 180℃ and held for 3 minutes, and high-frequency heating at 180℃ and held for 2 minutes. The second time interval between adjacent high-frequency heating sub-steps is 20 seconds.

[0113] 4) Cooling treatment: The cured load-bearing components are sequentially cooled by four water-cooled cold presses until the average temperature of the wood board is 70°C. The compression rate of the wood board remains at 45% after each cold press. The third time interval between cold presses of adjacent water-cooled cold presses is 20 seconds.

[0114] 5) Curing treatment: Place the cooled wood on a horizontal, dry surface and apply a pressure of 5.5 MPa to the upper surface of the wood. After curing for 3 days, reduce the pressure by 1.2 MPa per day until the pressure is 0, and continue curing for 10 days.

[0115] Control Experiment Example 2

[0116] The bearing member of the present invention is processed using the method of Example 1 of CN 111421633 A (publication date: 2020-07-17), that is, the pre-treated wooden board is placed in the shallow groove of the pallet to form the bearing member; at the same time, the bearing member is subjected to high-frequency compaction using a non-progressive device such as a high-frequency compaction device of CN109454721A (2019.03.12).

[0117] Example 5

[0118] The method described in Example 1 of CN 103753664A (2014.4.30) is used to process the bearing member of this invention, except that steps 2) to 5) are set as a progressive process in the production line equipment of this invention. It should be noted that the number of high-frequency hot presses is adjusted on the production line as required by the steps. The specific method is as follows:

[0119] 1) Pretreatment: The wood boards with a density ρ = 0.6 are pretreated to control the average moisture content of the boards at 18%. The boards are then placed in the shallow groove of the tray to form a load-bearing component. The load-bearing component is preheated on a high-frequency hot press at a temperature of 180°C for 2 seconds.

[0120] 2) The preheated load-bearing components are subjected to the first high-frequency hot pressing treatment. The load-bearing components are sequentially put into three hot presses for hot pressing, and are sequentially heated to 100℃ and held for 2 minutes, heated to 100℃ and held for 2 minutes, and heated to 100℃ and held for 1 minute respectively; the interval between adjacent high-frequency heating sub-steps is 20 seconds.

[0121] 3) After heating, the load-bearing components are sequentially fed into three high-frequency hot presses for hot pressing. The high-frequency heating temperatures are 140℃ and held for 2 minutes, 160℃ and held for 2 minutes, and 180℃ and held for 2 minutes, respectively, with a 20-second interval between adjacent high-frequency heating sub-steps. The compression rates of the wood panels are 40%, 45%, and 50%, respectively. 。

[0122] 4) The compressed load-bearing components are subjected to a second high-frequency hot pressing treatment. The load-bearing components are sequentially put into three hot presses for hot pressing, and are sequentially heated to 180°C and held for 8 minutes, heated to 180°C and held for 7 minutes, and heated to 180°C and held for 7 minutes respectively. The interval between adjacent high-frequency heating sub-steps is 20 seconds.

[0123] 5) The load-bearing components are sequentially cooled by four water-cooled cold presses until the average temperature of the wood board is 60°C. The compression rate of the wood board remains at 50% after each cold press. The third time interval between cold presses of adjacent water-cooled cold presses is 20 seconds.

[0124] Controlled Experiment Example 3

[0125] The bearing member of this invention is processed using the method of Example 1 in CN 103753664A (2014.4.30), which involves placing the pre-treated wooden board into a shallow groove in a tray to form the bearing member; simultaneously, a non-progressive device, such as a high-frequency compaction device as described in CN109454721A (2019.03.12), is used to perform high-frequency compaction on the bearing member. In comparison, the non-progressive device described in this embodiment is different from the present invention's technical solution, which uses docking tracks between multiple heating and compaction devices; in this case, there are no docking tracks between the devices.

[0126] Experimental comparison results

[0127] 1. Comparison of anti-rebound measures between the progressive high-frequency compaction method and known high-frequency compaction methods

[0128] Referring to GB / T 1934.1-2009 "Method for Determination of Water Absorption of Wood", the average water absorption rate (%), water absorption rate difference (%), and water absorption thickness swelling rate (%) of the provided compacted wood boards after 6 hours were measured in Examples 1, 2-1, 2-2, 2-1 and Control Example 1, Example 4 and Control Example 2, and Example 5 and Control Example 2. The test results are shown in Table 3. The average water absorption rate is the average of the water absorption rates measured on the upper and lower surfaces of the compacted wood boards at thicknesses of 2cm, 4cm, 5cm, 6cm, and 8cm (when measuring the water absorption rate of a specific thickness, it can be processed by cutting or drilling before measurement); the water absorption rate difference is the difference between the maximum and minimum values ​​of the measured water absorption rates; the water absorption thickness swelling rate (%) = (thickness before soaking - thickness after soaking) / thickness before soaking.

[0129] Table 3 shows the water absorption test results of the compacted wood boards prepared by the above methods.

[0130]

[0131]

[0132] The average water absorption rate (%) of the high-frequency compacted wood in Examples 1, 2-1, 2-2, 2-1 and Control Example 1 over 6 hours was less than 0.70%, and the water absorption rate difference (%) and the water absorption thickness expansion rate (%) were significantly better than those of Control Example 1.

[0133] The high-frequency compacted wood of Example 4 exhibited an average water absorption rate (%) of 0.70% over 6 hours, a water absorption difference (%) of 0.23%, and a water absorption thickness expansion rate (%) of 0.47%, which are superior to the indicators of Example 1 in CN 111421633 A (July 17, 2020). The water absorption thickness expansion rate (%) was reduced by approximately half. The indicators of Control Example 2 were inferior to those of Example 4, demonstrating that the progressive method steps are more effective in addressing the springback problem when using the load-bearing components of this invention.

[0134] The average water absorption rate (%), water absorption difference (%), and water absorption thickness expansion rate (%) of the high-frequency compacted wood in Example 5 over 6 hours are all significantly better than those of the control test Example 3, which also demonstrates that the progressive compaction method is suitable for the load-bearing components of the present invention.

[0135] The main chemical components of wood are cellulose, hemicellulose, and lignin (the three major elements). If cellulose, hemicellulose, and lignin form a large number of hydrogen bonds in compacted wood, the compacted wood is less prone to rebound compared to other types of wood. The progressive high-frequency compaction method of this invention, due to its multiple high-frequency heating sub-steps, multiple compression compaction sub-steps, and / or multiple rapid cooling steps, allows cellulose, hemicellulose, and lignin molecules to intertwine and extend multiple times, forming a greater number of hydrogen bonds. Furthermore, the microstructure of the three major elements is more tightly interwoven, which better locks in water molecules, allowing the high-frequency compacted wood to better resist the disruption of hydrogen bonds by moisture when it absorbs moisture. This is the principle of the wood-reinforcing process of this invention.

[0136] 2. Comparison of production efficiency between the progressive high-frequency compaction method and known high-frequency compaction methods

[0137] The static working point of an assembly line refers to the working position in each work unit of the assembly line where the load-bearing component needs to stay and be processed instead of being moved around. For example, when wood is heated by a high-frequency medium heating device or when wood is compressed and compacted by a hydraulic press, the load-bearing component needs to stay at the working position to be processed and cannot continue to move around.

[0138] The dynamic working point of an assembly line refers to the working position in each work unit of the assembly line that does not require a load-bearing component to stay and be processed in that work unit and can be transferred through, such as the air-cooled roller conveyor section and the curing roller conveyor section.

[0139] Comparing the method of the embodiments of the present invention with the process of CN 111421633 A (2020, 07, 17), it can be seen that since the embodiments of the present invention break down the "high-frequency heating step" into multiple high-frequency heating sub-steps and the "compression and compaction step" into multiple compression and compaction sub-steps, and since the production line is a cyclic operation, and both the "high-frequency heating step" and the "compression and compaction step" are static working points of the production line, the progressive high-frequency compaction method of the embodiments improves the production efficiency by more than 3 times compared with the existing high-frequency compaction method.

[0140] The "Progressive Wood-Impregnating High-Frequency Compaction Method" of this invention is based on the "High-Frequency Compaction Method." It breaks down a high-frequency heating step that would normally be completed in one step into multiple high-frequency heating sub-steps performed at intervals, or a compression and compaction step that would normally be completed in one step into multiple compression and compaction sub-steps performed at intervals, or a rapid cooling step that would normally be completed in one step into multiple rapid cooling steps performed at intervals. During the "intervals," the processes applied to the wood in the corresponding steps, such as heating, pressurization, and water cooling, are removed. This "Progressive Wood-Impregnating High-Frequency Compaction Method" is highly suitable for use with the "Progressive Wood-Impregnating High-Frequency Compaction Equipment" of this invention. This "Progressive Wood-Impregnating High-Frequency Compaction Equipment" can maintain the mechanical properties of the compacted wood board and prevent springback while simplifying the load-bearing components through the equipment and its processes.

[0141] The above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the specific embodiments of the present invention. Therefore, the foregoing description is only preferred and not restrictive.

Claims

1. A compaction method for a progressive high-frequency compaction production line, characterized in that, The production line includes operating equipment and supporting components. The operating equipment includes a feeding section, a preheating section, a high-frequency hot pressing section, a water-cooled cold pressing section, and a saturated water-cooled pressing section arranged sequentially in a first straight line. The high-frequency hot pressing section includes several high-frequency hot presses. The second moving roller conveyor of each high-frequency hot press extends from the internal hot pressing station toward the inlet and outlet on both sides and is exposed. The exposed second moving roller conveyors of adjacent high-frequency hot presses are connected. The water-cooled cold pressing section includes several water-cooled cold presses. The third moving roller conveyor of each water-cooled cold press extends from the internal pressing station toward the inlet and outlet on both sides and is exposed. The exposed third moving roller conveyors of adjacent water-cooled cold presses are connected. The supporting component includes a tray and the wooden board it supports. When the supporting component is moved by the moving roller conveyor, the thickness direction of the wooden board is not restricted by the operating equipment. The method includes the following steps: 1) Preheating treatment: The supporting component enters three preheating machines in sequence for preheating. The high-frequency heating temperature is 80-90℃ and held for 8-12s, 100-110℃ and held for 8-12s, and 120-130℃ and held for 4-6s, respectively. The compression rate of the wooden board increases step by step after each preheating machine according to the hot pressing sequence. The compression rates of the wooden board are 15-20%, 20-25%, and 25-30%, respectively. The first time interval between adjacent high-frequency preheating machines is 5-20 seconds. 2) High-frequency hot pressing treatment: After preheating, the load-bearing components are sequentially placed into three hot presses for hot pressing. The components are then sequentially heated to 140-160℃ and held for 2-4 minutes, heated to 160-180℃ and held for 2-4 minutes, and heated to 180-200℃ and held for 1.5-3 minutes. The compression rate of the wood boards increases progressively after each hot press, with compression rates of 30-40%, 40-50%, and 50-60%, respectively. The second time interval between the end of hot pressing in one hot press and the start of hot pressing in the next hot press is 20-30 seconds. 3) Water-cooled cold pressing treatment: After hot pressing, the load-bearing components are placed in four water-cooled cold presses for cold pressing. Each water-cooled cold press is used sequentially for 3-6 minutes. The temperature of the wood boards decreases step by step after each water-cooled cold press, with the temperatures after each cold press being 160-180℃, 140-160℃, 120-140℃, and 100-120℃ respectively. The compression rate of the wood boards increases step by step after each water-cooled cold press, with an increase of 3-5% at each level. The third time interval between the end of the cold pressing of one water-cooled cold press and the start of the cold pressing of the next water-cooled cold press is 20-30 seconds. 4) Saturated water-cooled pressing: The load-bearing components after cold pressing are put into the water-cooled pressing equipment line for cold pressing and curing. The equipment pressure is 60T, the processing time is 25-35min, and the wood board is cooled to an average temperature of 70-80℃.

2. The method of claim 1, wherein the method further comprises: The preheating section includes several preheaters. The first moving roller of each preheater extends from the internal preheating station toward the inlet and outlet on both sides and is exposed. The exposed first moving rollers of adjacent preheaters are connected.

3. The method of claim 1, wherein the method further comprises: The operating equipment further includes a first conveying section, a second conveying section, an air-cooled roller conveyor section, a curing roller conveyor section, and a discharge section; the air-cooled roller conveyor section, the curing roller conveyor section, and the discharge section are arranged in reverse order on a second straight line, one side of the first conveying section is located downstream of the saturated water-cooled pressing section, and the other side is located upstream of the air-cooled roller conveyor section; one side of the second conveying section is located downstream of the discharge section, and the other side is located upstream of the loading section.

4. The method of claim 3, wherein the method further comprises: The loading section includes a wooden board loading platform, a moving roller conveyor platform, and a wooden board picking mechanism. One side of the wooden board loading platform is connected to the moving roller conveyor platform. The wooden board loading platform is a translational roller conveyor used to transport wooden boards to the side of the moving roller conveyor platform. The wooden board picking mechanism is located at the top of the moving roller conveyor platform and extends upstream of the moving roller conveyor platform to above the docking side of the wooden board loading platform. The wooden board picking mechanism uses a suction cylinder and an air nozzle. The unloading section includes an unloading moving roller conveyor platform and an unloading picking mechanism. The unloading picking mechanism is located at the top of the unloading moving roller conveyor platform and extends upstream of the moving roller conveyor platform to above the moving roller conveyor near the downstream side of the curing roller conveyor section. The downstream end of the curing roller conveyor section is connected to the second conveying section. The unloading picking mechanism uses a suction cylinder and an air nozzle.

5. The method of claim 3, wherein the method further comprises: The first conveying section is longitudinally arranged downstream of the saturated water-cooled pressing section of multiple lines, and at the other end of the saturated water-cooled pressing section, it is connected to the upstream roller of the air-cooled roller section. A mechanical pusher is provided at this end to push the wooden board to the air-cooled roller section. The first conveying section is a longitudinal moving platform used to move the water-cooled wooden board longitudinally to the end connected to the air-cooled roller section. The second conveying section is longitudinally arranged and has one side connected to the downstream end of the curing roller section and the side of the feeding section away from the preheating section. The pallet is connected to the side of the loading section by a mechanical pusher that pushes the pallet onto the moving roller conveyor platform of the loading section.

6. The method of claim 3, wherein the method further comprises: Several parallel first straight lines can be arranged between the feeding section and the first conveying section. The preheating section, the high-frequency hot pressing section, the water-cooled cold pressing section and the saturated water-cooled pressing section are arranged sequentially on each first straight line.

7. The method of claim 1, wherein the method further comprises: The tray has shallow grooves on the side facing the wooden board, the shape of which is adapted to the shape of the wooden board. The tray has water channels along the horizontal and / or vertical directions on the side facing the wooden board, and water channels have water holes that run through the entire tray.

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