Progressive striking type high-frequency compaction assembly line

Abstract

The utility model relates to a progressive striking type high-frequency compaction assembly line. The progressive striking type high-frequency compaction assembly line comprises operation equipment and a bearing component, the operation equipment comprises a preheating part, a high-frequency hot-pressing part and a water-cooling cold-pressing wood striking part; the high-frequency hot-pressing part comprises a plurality of high-frequency hot-pressing machines, a moving roller way of each high-frequency hot-pressing machine extends from an internal hot-pressing station to inlets and outlets in the two sides to be exposed, and the adjacent exposed moving roller ways are in butt joint; the water-cooling cold-pressing wood striking part comprises a plurality of water-cooling cold-pressing machines, a movable roller way of each water-cooling cold-pressing machine extends and is exposed towards inlets and outlets in the two sides from an internal pressing station, and the adjacent exposed movable roller ways are in butt joint; the bearing component is a tray which is arranged below the wood board and used for bearing the wood board. According to the production line, the high-frequency hot-pressing part, the water-cooling cold-pressing wood striking part and the bearing component are used, on the premise that the thickness of a wood board is allowed to rebound, the technical problems that in the prior art, due to the fact that an upper pressing plate and a lower pressing plate are needed for clamping and pressure maintaining, operation is complex, and process step adjustment is limited in the production line circulation process are solved, and the rebound problem is solved.

Description

[0001] Claims 1-10 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 1-10 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 utility model relates to the field of wood board compaction technology, specifically to a progressive wood-beating high-frequency compaction production line. 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 utility model proposes to simplify existing load-bearing components by reducing the number of pressure plates, thereby simplifying the equipment and process flow and expanding the equipment's applicability. However, given the simplification of the load-bearing components, the key challenge lies in how to maintain the compacted mechanical properties of the wood board and prevent springback through the equipment and processes used. Utility Model Content

[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 compression production line with progressive compression technology.

[0007] This utility model 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 member includes a tray and a wooden board supported by the tray. The surface of the tray facing the wooden board has a shallow groove whose shape is adapted to the shape of the wooden board. When the supporting member is supported and moved by the second moving roller or the third moving roller, 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 device further includes a feeding section and a saturated water-cooled pressing section; 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 a first straight line.

[0014] Preferably, the operating device further includes a first conveying section, a second conveying section, and an air-cooled roller conveyor section, a curing roller conveyor section, and a discharge section arranged in reverse order on a second straight line. The first straight line and the second straight line are two parallel lines of the same length. 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.

[0015] Preferably, 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.

[0016] 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 of the air-cooled roller section.

[0017] Preferably, 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 above the moving roller of the curing roller section near the downstream side; 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 second conveying section is arranged longitudinally and one side is respectively connected to the downstream end of the curing roller conveyor and the side of the feeding section away from the preheating section; a mechanical pusher is provided at the connection point between the second section and the side of the feeding section to push the pallet onto the moving roller conveyor platform of the feeding section.

[0019] 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.

[0020] Preferably, the high-frequency hot press of the high-frequency hot pressing section is a device with a working pressure of 2300T; the water-cooled cold press of the water-cooled cold pressing section is a device with a working pressure of 2300T; and the press of the saturated water-cooled pressing section is a device with a working pressure of 60T.

[0021] Compared with the prior art, the beneficial effects of this utility model include:

[0022] 1. This utility model of a progressive wood-pressing high-frequency compaction production line is a fully automated and efficient production line. Its unique progressive compression equipment—a high-frequency hot pressing section and a water-cooled cold pressing section—combined with simple load-bearing components, allows for the rebound of wood thickness. It overcomes the technical difficulties of existing technologies that require upper and lower pressure plates to clamp and maintain pressure, resulting in complex operation and limited process adjustments during production line flow. This significantly improves production efficiency and truly realizes large-scale, highly automated, lights-out factory production.

[0023] 2. This utility model production line can be used for compaction of both logs and non-logs, with good versatility. Furthermore, the timing and method of heating and pressurizing in the high-frequency hot press equipment in this production line are more flexible, greatly improving the practicality of the production line.

[0024] 3. The "progressive" technology of this utility model's progressive high-frequency compaction production line 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's density and hardness while reducing its 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.

[0025] 4. In this utility model, the load-bearing component (i.e., the raw wooden board placed inside the hot press plate) flows on the production line, 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 utility model, 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

[0026] Figure 1 This is a schematic diagram of the overall structure of the progressive high-frequency compaction production line of this utility model.

[0027] Figure 2 This is a schematic diagram of the feeding section of this utility model;

[0028] Figure 3 This is a schematic diagram of the preheating section of this utility model;

[0029] Figure 4 This is a schematic diagram of the high-frequency hot pressing part of this utility model;

[0030] Figure 5 This is a schematic diagram of the water-cooled cold-pressing part of the present invention;

[0031] Figure 6 This is a schematic diagram of the saturated water-cooled pressing part of this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of the first conveying section of this utility model;

[0033] Figure 8 This is a schematic diagram of the unloading part of this utility model;

[0034] Figure 9 This is a schematic diagram of the moisture content detection unit of this utility model;

[0035] Figure 10 This is a structural schematic diagram of the load-bearing component of this utility model. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings:

[0037] This utility model of a progressive high-frequency compaction production line includes operating equipment and load-bearing components.

[0038] This utility model features a unique progressive compression device for production line design. This device breaks down a high-frequency heating step that would otherwise be completed in one go into multiple high-frequency heating sub-steps that are gradually completed at certain time intervals. It also breaks down a compression and densification step that would otherwise be completed in one go into multiple compression and densification sub-steps that are gradually completed at certain time intervals. Alternatively, it breaks down a rapid cooling step that would otherwise be completed in one go into multiple rapid cooling steps that are gradually completed at certain time intervals.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The supporting member includes a tray and the wooden board it supports. When the supporting member is supported and 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.

[0043] In another complete pipeline example, refer to Figure 1 As 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 to form a complete production line.

[0044] Figure 1In 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.

[0045] 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 utility model does not limit the type of material.

[0046] The following is a detailed description of each operating device according to the flow direction of the production line.

[0047] 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.

[0048] 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.

[0049] To improve the production efficiency of wood board compaction, the production line described in this utility model 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The key feature of this progressive technology is that, in existing technologies, each equipment unit is tightly connected, and upper and lower positioning rollers are used to maintain pressure on the wooden board during movement. In contrast, this invention features exposed connecting roller tracks between equipment units, eliminating the need for positioning rollers at intervals. After the previous unit stops pressurizing, the wood fibers within the board undergo a moderate amount of rebound before the next pressurization. Through repeated progressive pressurization and depressurization operations in the high-frequency hot-press section, the wood fiber structure within the template is repeatedly disrupted, thereby reducing its resilience (i.e., springback).

[0054] 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.

[0055] On the other hand, the progressive compression technology of this invention uses a series of high-frequency hot presses with intermittently connected high-frequency hot pressing sections to progressively compress the wood panels. The compression ratio of the wood panels increases gradually, thereby progressively raising 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. 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.

[0056] 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.

[0057] 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.

[0058] 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).

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] All moving roller conveyors on the entire production line use conveyor rollers for transport.

[0065] Based on the aforementioned production line equipment, each high-frequency preheater in the preheating section is connected by exposed roller conveyors, ensuring a 5-10 second interval between each preheating of the wood board. Each machine unit in the high-frequency hot pressing section and the water-cooled cold pressing section is connected by a 20-30 second interval between each corresponding processing step. The high-frequency hot pressing section includes three high-frequency hot presses, each with an equal hot pressing interval. Both the temperature and the compression rate of the wood board are progressively increased. This invention does not specify the exact range of this progressive increase in temperature and compression rate; for example, the compression rate may increase by 30% each time. Through this equipment, the compression ratio is gradually increased during the wood board 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.

[0066] 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 of 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, through the progressive compaction process of this invention, the load-bearing component, combined with the "progressive" compaction technology, achieves or even surpasses the technical effects of existing "sandwich-style flow structures" (wooden boards 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.

[0067] Furthermore, since the "hot press plate circulation structure" of this utility model is not limited by the upper pressure plate, 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.

[0068] This utility model's progressive compaction technology strictly limits the compression rate of the wood board at each stage. 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 9As 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.

[0069] 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 sections.

[0070] 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.

[0071] 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.

[0072] The compression rate mentioned in this invention refers to the percentage of logs 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.

[0073] The above technical solution is only one implementation of this utility model. For those skilled in the art, based on the principles disclosed in this utility model, it is easy to make various types of improvements or modifications, and not limited to the technical solutions described in the above specific embodiments of this utility model. Therefore, the foregoing description is only a preferred option and does not have a limiting meaning.

Claims

1. A progressive high-frequency compaction production line, comprising operating equipment and load-bearing components, characterized in that, The operating equipment includes a preheating section, a high-frequency hot pressing section, and a water-cooled cold pressing section connected in sequence. 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. 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. The supporting member includes a tray and a wooden board supported by the tray. The surface of the tray facing the wooden board has a shallow groove whose shape is adapted to the shape of the wooden board. When the supporting member is supported and moved by the second moving roller or the third moving roller, the thickness direction of the wooden board is not restricted by the operating equipment.

2. The progressive high-frequency compaction production line as described in claim 1, characterized in that, 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 progressive high-frequency compaction production line as described in claim 1, characterized in that, The operating equipment also includes a feeding section and a saturated water-cooled pressing section; 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 a first straight line.

4. The progressive high-frequency compaction production line as described in claim 3, characterized in that, The operating equipment also includes a first conveying section, a second conveying section, and an air-cooled roller conveyor section, a curing roller conveyor section, and a discharge section arranged in reverse order on a second straight line. The first straight line and the second straight line are two parallel lines of the same length. 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.

5. The progressive high-frequency compaction production line as described in claim 3, characterized in that, 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 on 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.

6. The progressive high-frequency compaction production line as described in claim 4, characterized in that, The first conveying section is longitudinally arranged on the downstream side 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, 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 of the air-cooled roller section.

7. The progressive high-frequency compaction production line as described in claim 4, characterized in that, 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.

8. The progressive high-frequency compaction production line as described in claim 4, characterized in that, 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.

9. The progressive high-frequency compaction production line as described in claim 4, characterized in that, 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.

10. The progressive high-frequency compaction production line as described in claim 3, characterized in that, The high-frequency hot press of the high-frequency hot pressing section is a device with a working pressure of 2300T; the water-cooled cold press of the water-cooled cold pressing section is a device with a working pressure of 2300T; and the press of the saturated water-cooled pressing section is a device with a working pressure of 60T.

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