A sequential high-frequency consolidation flow line and method for laying wood down.

Abstract

This relates to a high-frequency consolidation flow line that sequentially lays down wood. [Solution] The operating equipment includes a preheating section, a high-frequency hot crimping section, and a water-cooled cold crimping wood laying section. The high-frequency hot crimping section includes several high-frequency hot crimping machines, the moving roller tables of each high-frequency hot crimping machine extend from the internal hot crimping work station toward the entrances on both sides and are exposed to the outside, with adjacent externally exposed moving roller tables butting against each other. The water-cooled cold crimping wood laying section includes several water-cooled cold crimping machines, the moving roller tables of each water-cooled cold crimping machine extend from the internal crimping work station toward the entrances on both sides and are exposed to the outside, with adjacent externally exposed moving roller tables butting against each other. The support members are trays placed beneath the wood boards to support them. The flow line is used for the support members by the high-frequency hot crimping section and the water-cooled cold crimping wood laying section, allowing for springback of the wood board thickness.

Description

Technical Field

[0001] The present invention relates to the field of wood board consolidation technology, and specifically to a sequential laying wood type high-frequency consolidation flow operation line and its consolidation method.

Background Art

[0002] Conventional high-frequency technology is widely applied in wood board consolidation. High-frequency softening of the consolidated wood board is ideal, with short time consumption and low power consumption. However, in the high-frequency pressing technology, it is necessary to compress the wood board at high pressure in an ultra-short time. Therefore, when the pressure is removed, the springback of the wood board is serious. Regarding the combined production line of high-frequency consolidated wood with Chinese Patent Application No. 201910181348.8 and filing date of March 11, 2019, the operating equipment of this production line adopts the "sandwich type flow structure" of close engagement between the auxiliary high-frequency softening part, the main high-frequency press part and the cooling part, and the upper pressure plate and the lower pressure plate sandwich the wood board, so as to keep the wood at high pressure during the heating and cooling stages, thereby avoiding the serious springback caused by the decompression of the wood. On the other hand, the sandwiching of the upper pressure plate and the lower pressure plate with a porous plate structure reduces the moisture content of the consolidated wood and solves the problem of springback. The equipment for evenly discharging the compressed water vapor on the surface of the consolidated wood with Chinese Patent Application No. 202010100409.6 and filing date of February 18, 2020 also adopts the "sandwich type flow structure" of sandwiching the wood board by the upper pressure plate and the lower pressure plate to maintain the pressure (thickness), and increases the sandwiching of the porous plate to reduce the moisture content of the consolidated wood, thereby solving the problem of springback.

[0003] Furthermore, the technical solutions in Chinese patent application numbers 202010100409.6 (filed on 2020.2.18), 201811573895.2 (filed on 2018.12.21), and 201910181346.9 (filed on 2019.03.11) all involve a "sandwich-type fluid structure," which maintains the pressure of the wooden boards during processing, solving the problem of the wooden boards springing back. While the above technical solutions address the issue of wood springback to some extent, the "sandwich-type flow structure" used in these devices requires the wooden board to constantly maintain pressure during operation. This makes process operations such as pressurizing and heating complicated. For example, in the high-frequency heating process, it is necessary to energize the electrodes in the upper and lower crimping plates, in the cooling step, it is necessary to cool the plates by placing a cooling medium inside them, and when grasping the template, it is necessary to grasp the upper crimping plate first. The supply and discharge steps are complicated, affecting production efficiency and making it disadvantageous to achieving industrially efficient production.

[0004] Based on the above technical problems, the applicant is focused on developing simpler auxiliary equipment and process technologies to solve the problem of wood board springback and maintain the excellent physical properties of the wood board. The present invention simplifies the equipment and process flow by simplifying conventional support members and reducing the number of compression plates, thereby expanding the practicality of the equipment. Given the simplification of support members, the technical problem of how to maintain the mechanical properties of wood board consolidation and avoid springback by the equipment and equipment process is of particular importance. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Chinese Patent Application Number 201910181348.8 [Patent Document 2] Chinese Patent Application Number 202010100409.6 [Patent Document 3] Chinese Patent Application Number 201811573895.2 [Patent Document 4] Chinese Patent Application Number 201910181346.9 [Patent Document 5] Chinese Patent Application Number 201811592197.7 [Patent Document 6] CN111421633A [Patent Document 7] CN109454721A [Patent Document 8] CN103753664A [Overview of the project] [Problems that the invention aims to solve]

[0006] The objective of the present invention is to solve the problems present in the prior art described above, and the present invention provides a simplified support member and a sequential high-frequency consolidation flow line that sequentially lays down wood using sequential compression technology. [Means for solving the problem]

[0007] This invention is realized through the following technical solutions.

[0008] A sequential high-frequency consolidation flow line for laying wood, wherein the operating equipment includes a preheating unit, a high-frequency hot-pressing unit, and a water-cooled cold-pressing wood laying unit, connected in sequence. The aforementioned high-frequency hot crimping section includes several high-frequency hot crimping machines, the second mobile roller table of each high-frequency hot crimping machine extending from the internal hot crimping work station toward the entrances on both sides and exposed to the outside, and the second mobile roller tables of adjacent high-frequency hot crimping machines that are exposed to the outside abut against each other. The water-cooled cold crimping wood laying section includes several water-cooled cold crimping machines, the third mobile roller table of each water-cooled cold crimping machine extending from the internal crimping work station toward the entrances on both sides and exposed to the outside, and the third mobile roller tables of adjacent water-cooled cold crimping machines exposed to the outside abut against each other. The support member includes a tray and a wooden board it supports, and when the support member is supported and moved by a movable roller table, the thickness direction of the wooden board is not constrained by the operating device.

[0009] Preferably, the preheating section includes several preheaters, the first movable roller table of each preheater extending from the internal preheating work station toward the doorways on both sides and exposed to the outside, and the first movable roller tables of adjacent preheaters that are exposed to the outside abut against each other.

[0010] Preferably, the operating device further includes a supply unit, a saturated water-cooled pressure welding unit, a first conveying stage, a second conveying stage, an air-cooled roller table unit, a curing roller table unit, and a discharge unit. The supply unit, preheating unit, high-frequency hot-pressing unit, water-cooled cold-pressing wood laying unit, and saturated water-cooled pressure welding unit are installed in a first straight line in the forward direction, the air-cooled roller table unit, curing roller table unit, and discharge unit are installed in a second straight line in the reverse direction, one side of the first conveying stage is installed downstream of the saturated water-cooled pressure welding unit and the other side is installed upstream of the air-cooled roller table unit, one side of the second conveying stage is installed downstream of the discharge unit and the other side is installed upstream of the supply unit.

[0011] Preferably, the supply unit includes a wooden board supply stage, a movable roller table stage, and a wooden board pickup mechanism. One side of the wooden board supply stage abuts against the movable roller table stage, the wooden board supply stage is a translational roller table used to transport wooden boards to the movable roller table stage, the wooden board pickup mechanism is installed on the top of the movable roller table stage and extends outward above the abutting side of the wooden board supply stage on the upstream side of the movable roller table stage, the wooden board pickup mechanism employs a suction cylinder and a gas nozzle, The discharge section includes a discharge moving roller table stage and a discharge pickup mechanism, the discharge pickup mechanism is installed at the top of the discharge moving roller table stage and extends outward on the upstream side of the moving roller table stage, above the moving roller table that is closer to the downstream side of the curing roller table section, the downstream end of the curing roller table section abuts against the second transport stage, and the discharge pickup mechanism employs an adsorption cylinder and a gas nozzle.

[0012] Preferably, the first conveying stage is installed downstream of the saturated water-cooled pressure welding section of a plurality of lines in the vertical direction, and abuts against the upstream roller table of the air-cooled roller table section at the other end of the saturated water-cooled pressure welding section, and a mechanical pusher is installed at this end to push the wooden board to the air-cooled roller table section, and the first conveying stage is a stage that moves in the vertical direction and is used to move the water-cooled wooden board vertically to abut against the air-cooled roller rail section at one end. The second transport stage is installed vertically, and one side abuts against the downstream end of the curing roller rail section and the side offset from the preheating section of the supply unit. A mechanical pusher is installed at the point where it abuts against the side of the supply unit to push the tray onto the mobile roller table stage of the supply unit.

[0013] Preferably, several parallel first straight lines may be installed between the supply unit and the first conveying stage, and the preheating unit, high-frequency hot crimping unit, water-cooled cold crimping wood laying unit, and saturated water-cooled pressure welding unit are installed in order on each of the first straight lines.

[0014] Preferably, shallow grooves are provided on the side of the tray facing the wooden board, the shape of which conforms to the shape of the wooden board, water guide grooves are provided on the side of the tray facing the wooden board along the transverse and / or longitudinal directions, and water guide holes are provided at the positions of the water guide grooves that penetrate the entire tray.

[0015] A second aspect of the present invention discloses a consolidation method that applies the above-described sequential high-frequency consolidation flow line, wherein the method comprises at least, In the high-frequency hot pressing process, the support member after preheating enters several hot presses in sequence to perform multiple hot presses. The compression rate of the wooden board after hot pressing of each hot press increases step by step according to the hot pressing sequence. The second time from the end of hot pressing of the previous hot press to the start of hot pressing of the next hot press for the support member is 20 - 30 seconds. In the water-cooled cold pressing and wood laying process, the support member after hot pressing enters several water-cooled cold presses in sequence to perform multiple water-cooled cold presses. The temperature of the wooden board after cold pressing of each water-cooled cold press decreases step by step according to the cold pressing sequence. The compression rate of the wooden board after cold pressing of each water-cooled cold press increases step by step according to the cold pressing sequence. The interval from the end of cold pressing of the previous water-cooled cold press to the start of cold pressing of the next water-cooled cold press for the support member is 20 - 30 seconds.

[0016] Preferably, the high-frequency hot pressing step further includes a preheating treatment before it. The support member enters several preheating machines in sequence to perform multiple preheatings. The first time from the end of preheating of the previous preheating machine to the start of preheating of the next preheating machine for the support member is 5 - 20 seconds.

Advantages of the Invention

[0017] Compared with the prior art, the beneficial effects of the present invention include the following.

[0018] 1. The sequential wood laying type high-frequency densification flow operation line of the present invention adopts a production mode of a fully automatic and high-efficiency flow operation line. Its unique sequential compression equipment - the high-frequency hot pressing part and the water-cooled cold pressing and wood laying part are used in combination with a simple support member. On the premise of allowing springback of the thickness of the wooden board, it changes the technical problems that the prior art requires clamping and pressure maintaining of the upper and lower pressing plates, resulting in complex operations and restricted adjustment of process steps during the flow process of the production line, greatly improving production efficiency, and truly realizing the dark factory type factory production with a high degree of scale automation.

[0019] 2. The assembly line of the present invention can be used for compacting logs and non-log materials, is highly versatile, and allows for more flexible adjustment of the heating and pressing timing and method of the high-frequency hot crimping equipment in this assembly line, significantly improving the practicality of the assembly line.

[0020] 3. The "sequential" technology of the sequential wood-laying type high-frequency consolidation flow line of the present invention is as follows: Sequential hot-pressure consolidation is performed on the wood board by a high-frequency hot-pressure presser with high-frequency hot-pressure sections connected in series at intervals, increasing the compression ratio of the wood board in stages, thereby sequentially increasing the temperature and compression rate of the wood, maximizing the evaporation and removal of moisture from the wood cell walls, increasing the density and hardness of the wood, and reducing the springback rate. After high-frequency hot-pressure consolidation, the wood board enters a high-pressure water cooler with water-cooled cold-pressure wood-laying sections connected in series at intervals for sequential pressurized water cooling, eliminating the need to maintain pressure between the high-pressure water coolers and making the processing method more flexible.

[0021] 4. In the assembly line of the present invention, what flows is not the upper crimping plate but the support member (i.e., the log board is placed in the hot crimping tray), and this structure facilitates supply and discharge, simplifies the structural complexity of the crimping plate, eliminates the step of the upper metal crimping plate and the heating or freezing unit of the crimping machine coming into contact, thereby simplifying the operating equipment and process steps. Moreover, regarding the springback prevention effect, the wood crimped by the sequential device of the present invention, through the combination of the flowing support member and the "sequential" technology of this application, can achieve technical effects similar to, and even better than, the "sandwich-type flow structure" and "conventional high-frequency conditions" of the prior art. [Brief explanation of the drawing]

[0022] [Figure 1] This is a schematic diagram of the overall structure of the sequential high-frequency consolidation flow line for laying wood according to the present invention. [Figure 2] This is a schematic diagram of the structure of the supply unit of the present invention. [Figure 3] This is a schematic diagram of the preheating section of the present invention. [Figure 4] This is a schematic diagram of the structure of the high-frequency hot crimping section of the present invention. [Figure 5] This is a schematic diagram of the structure of the water-cooled cold-crimped wood laying section of the present invention. [Figure 6] This is a schematic diagram of the structure of the saturated water-cooled pressure-welded portion of the present invention. [Figure 7] This is a schematic diagram of the structure of the first conveying stage of the present invention. [Figure 8] This is a schematic diagram of the structure of the discharge section of the present invention. [Figure 9] This is a schematic diagram of the structure of the moisture content detection unit of the present invention. [Figure 10] This is a schematic diagram of the structure of the support member of the present invention. [Modes for carrying out the invention]

[0023] The present invention will be described in more detail below with reference to the drawings.

[0024] The present invention provides a sequential high-frequency consolidation flow line for laying wood, which includes operating equipment and support members.

[0025] The present invention is designed for sequential compression equipment specific to a flow line, which divides a high-frequency heating step that can be completed in one pass into multiple high-frequency heating substeps at regular time intervals for sequential completion, divides a compression and consolidation step that can be completed in one pass into multiple compression and consolidation substeps at regular time intervals for sequential completion, or divides a rapid cooling step that can be completed in one pass into multiple rapid cooling steps that operate at regular time intervals for sequential completion.

[0026] In one specific example, the operating equipment includes, in sequence, a preheating unit, a high-frequency hot crimping unit, and a water-cooled cold crimping wood laying unit.

[0027] The high-frequency hot crimping section includes several high-frequency hot crimping machines, the second mobile roller table of each high-frequency hot crimping machine extending from the internal hot crimping work station toward the entrances on both sides and exposed to the outside, and the second mobile roller tables of adjacent high-frequency hot crimping machines that are exposed to the outside abut against each other.

[0028] The water-cooled cold crimping wood laying section includes several water-cooled cold crimping machines, the third mobile roller table of each water-cooled cold crimping machine extending from the internal crimping work station toward the entrances on both sides and exposed to the outside, and the third mobile roller tables of adjacent water-cooled cold crimping machines that are exposed to the outside abut against each other.

[0029] The support member includes a tray and a wooden board it supports, and when the support member is supported and moved by a movable roller table, the thickness direction of the wooden board is not constrained by the operating device. The fact that the thickness direction of the wooden board is not constrained by other operating devices means that, compared to the prior art technical solutions which require the wooden board to be held between upper and lower pressure plates to maintain its thickness in a compressed state, the wooden board does not require an upper pressure plate to be added during the flow process and does not need to constantly maintain pressure in the thickness direction.

[0030] In another example of a complete assembly line, as shown in Figure 1, the operating equipment includes a supply unit 1, a preheating unit 2, a high-frequency hot crimping unit 3, a water-cooled cold crimping wood laying unit 4, a saturated water-cooled pressure welding unit 5, a first conveying stage 6, an air-cooled roller table unit 7, a curing roller table unit 8, a discharge unit 9, and a second conveying stage 10, which are installed in sequence according to the wood board compaction steps of the present invention to form a complete assembly line.

[0031] In the example shown in Figure 1, the following technical solution is provided to more rationally install each operating device in order to ensure the automation of process operations. The material supply unit 1, preheating unit 2, high-frequency hot crimping unit 3, water-cooled cold crimping wood laying unit 4, and saturated water-cooled pressure welding unit 5 are installed in order in the forward direction in a first straight line, and the air-cooled roller table unit 7, curing roller table unit 8, and discharge unit 9 are installed in order in the reverse direction in a second straight line on one side of the first straight line, and the first and second straight lines are two parallel lines of the same length. The first conveying stage 6 is installed as a guide and turning device, with one side installed downstream of the saturated water-cooled pressure welding unit 5 and the other side installed upstream of the air-cooled roller table unit 7. The second conveying stage 10 is another guide and turning device, with one side installed downstream of the discharge unit 9 and the other side installed upstream of the supply unit 1.

[0032] The support member is a tray 100 placed beneath the wooden board to support it. As shown in Figure 10, in the structure, shallow grooves 113 are provided on the surface of the tray 100 facing the wooden board. The shape of the shallow grooves 113 conforms to the shape of the wooden board, allowing for positional control of the wooden board and preventing some degree of displacement of the wooden board. Water guide grooves 110 are provided on the surface of the shallow grooves 113 along the transverse and / or longitudinal directions, and water guide holes 114 are provided at the location of the water guide grooves 110, penetrating the entire tray 100. The pressure supported by the tray 100 is set based on the operating pressure of the welding machine in the assembly line. In one example, the pressure supported by the tray 100 is converted to 2300 T (tons) / 1.75 square meters, or kg / cm². 2 The material can be calculated based on this, for example, stainless steel or alloy steel, and the present invention is not limited to these.

[0033] The following describes each operating device in detail, following the flow direction of the assembly line.

[0034] As shown in Figure 2, the supply unit 1 includes a wooden board supply stage 12, a movable roller table stage 11, and a wooden board pickup mechanism 13. One side of the wooden board supply stage 12 abuts against the movable roller table stage 11, and the wooden board supply stage 12 is a translational roller table used to transport wooden boards to the movable roller table stage 11. The wooden board pickup mechanism 13 is installed on the top of the movable roller table stage 11 and extends outward from the upstream side of the movable roller table stage 11, above the abutting side of the wooden board supply stage 12.

[0035] The wooden board pickup mechanism 13 can employ a manipulator or a suction mechanism, preferably a suction mechanism, which includes a suction cylinder and a suction nozzle installed at the output end of the suction cylinder. During operation, the suction cylinder controls the suction nozzle to pick up and release the wooden board. The movable roller table stage 10 is a translational roller table, on which a tray 100 is placed. After the wooden board pickup mechanism 13 grasps the wooden board, it moves above the tray 100 and releases the wooden board onto the tray 100, forming a support member with the wooden board and tray 100. One side of the movable roller table stage 10 abuts against the preheating section 2, and a mechanical pusher is installed to push the support member against the preheating section 2 to perform the preheating process. In one improved example, to adapt the height of the wooden board to the suction mechanism, a lifting platform is further installed below the supply work station of the wooden board supply stage 10 and used to raise the wooden board to be picked up to an appropriate height for suction.

[0036] To improve the production efficiency of wood board compaction, the production line of the present invention employs multiple lines and is installed in parallel. As shown in Figure 1, the upstream side of the multiple lines is arranged in parallel from the movable roller table stage 10 side of the supply unit 1. The preheating unit 2, high-frequency heating and pressing unit 3, water-cooled cold pressing and wood laying unit 4, and saturated water-cooled pressing unit 5 are installed in each line, respectively.

[0037] The preheating section 2 in each line uses several preheaters connected in series. The preheaters can be conventional heat transfer fluid preheaters, steam preheaters, or high-frequency preheaters, and preferably high-frequency preheaters. In one improved configuration, the first moving roller table of the preheater extends from the internal preheating work station toward the inlets on both sides and is exposed to the outside, and the first moving roller tables of adjacent preheaters that are exposed to the outside abut against each other, and the first moving roller tables that are exposed to the outside provide an intermittent depressurization passage to the support member during the flow process, so that the support member can better achieve depressurization between the current pressurizing equipment and the next pressurizing equipment.

[0038] Figure 3 shows one specific example, 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 support member, preheating the wooden board on the support member with high frequency, and then transport it to the high-frequency hot-pressure bonding unit 3. The support member is released from the first pressure within a first hour after either of the high-frequency preheaters 201 or 202 stops applying pressure. The first hour starts at the point when the current preheating equipment unit stops applying pressure (providing the compression ratio) and ends at the point when the next equipment unit starts applying pressure (providing the compression ratio). Preferably, the first hour is 5-20 seconds.

[0039] Each line employs a high-frequency hot crimping section 3 with multiple high-frequency hot crimping machines connected in series. The second mobile roller table of each high-frequency hot crimping machine extends from the internal hot crimping work station toward the entrances on both sides and is exposed to the outside, and the second mobile roller tables of adjacent high-frequency hot crimping machines that are exposed to the outside are abutted together. The heating temperature and operating pressure parameters in each high-frequency hot crimping machine are determined based on the compression ratio achieved by the wooden board in the corresponding hot crimping machine, and the compression ratio of the wooden board achieved by the multiple high-frequency hot crimping machines from upstream to downstream increases in stages. The number of high-frequency hot crimping machines is set according to the actual situation. In one example, as shown in Figure 4, there are preferably three machines, and the operating temperatures (heating temperatures applied to the wooden board during operation) of the three high-frequency hot crimping machines 301, 302, and 303 from upstream to downstream increase in stages, and the operating pressure of the three high-frequency hot crimping machines 301, 302, and 303 is the same. The three high-frequency hot crimping machines 301, 302, and 303 sequentially apply a second pressure to the support member, heating the wooden board in the support member with high frequency, and then transport it to the water-cooled cold crimping wood laying section 4. The support member is released from the second pressure within two hours after any of the high-frequency hot crimping machines 301, 302, or 303 stops applying pressure. The first hour starts at the time the current hot crimping equipment unit stops applying pressure (supplying the compression ratio) and ends at the time the next equipment unit starts applying pressure (supplying the compression ratio). Preferably, the second hour is 10-30 seconds. The operating temperature of the first high-frequency hot crimping machine 301 is 200°C, the operating temperature of the second high-frequency hot crimping machine 302 is 250°C, and the operating temperature of the third high-frequency hot crimping machine 303 is 300°C. The operating pressure of all three high-frequency hot crimping machines 301, 302, and 303 is 2300 T (tons). The operating parameters of each high-frequency hot crimping machine are set to achieve sequential compression of the wooden board.

[0040] The key points of the sequential technology of the present invention are as follows. In the prior art, each equipment unit is tightly engaged, and upper and lower positioning rollers are installed to maintain pressure and engage to connect the holding pressure during the wooden board movement process. On the other hand, in the present invention, an externally exposed butt roller table is installed between the equipment units, and there is no need to install positioning rollers at the intervals. After the previous equipment stops applying pressure, an appropriate amount of springback is allowed to occur in the wood pulp cellulose within the wooden board, and then the next application of pressure is performed. Through the sequential operation of repeating multiple pressurization and depressurization in the high-frequency hot crimping section, the wood pulp cellulose within the template is destroyed multiple times, thereby achieving the effect of weakening its recovery ability (i.e., springback).

[0041] The main chemical components of wood are cellulose, hemicellulose, and lignin (three fibrous elements). In compacted wood, if the cellulose, hemicellulose, and lignin form a large number of hydrogen bonds, the compacted wood will be less resilient than regular wood. In the sequential high-frequency compaction flow line of the present invention, which involves laying wood down sequentially, multiple high-frequency heating substeps, multiple compression compaction substeps, and / or multiple rapid cooling steps, the cellulose molecules, hemicellulose molecules, and lignin molecules can be woven and stretched multiple times, forming a larger number of hydrogen bonds with each other. Furthermore, the microstructure of the three fibrous elements is woven more tightly, allowing water molecules to be better locked in. When high-frequency compacted wood absorbs moisture, it can better resist the breakdown of hydrogen bonds caused by moisture, achieving the technical effect of avoiding the resilience problem of wood without the need for an upper compression plate.

[0042] On the other hand, the sequential compression technology of the present invention performs sequential hot compression and consolidation of a wooden board using a high-frequency hot crimping machine in which high-frequency hot crimping sections are connected in series in a spaced manner. This increases the compression ratio of the wooden board in stages, thereby sequentially increasing the temperature and compression rate of the wood, maximizing the evaporation and removal of moisture from the wood cell walls, increasing the wood density and hardness, and reducing the springback rate. Moreover, since the support members eliminate the need for clamping restrictions on the upper crimping plate, they provide conditions for flexible adjustment of the hot crimping process. For example, the high-frequency hot crimping machine may or may not be heated simultaneously with high-frequency pressure depending on the process requirements.

[0043] Both the high-frequency preheater of the preheating section 2 and the high-frequency hot crimping machine of the high-frequency hot crimping section 3 have a crimping mechanism and a heating mechanism. The crimping mechanism includes an upper template and a lower template installed at the preheating work station and the hot crimping work station. Since the crimping mechanism and heating mechanism of the hot crimping machine are conventional in this art, a detailed description of the drawings is omitted. For specific structures, refer to the relevant technical solutions disclosed in the applicant's previous patent document 5.

[0044] The water-cooled cold crimping wood laying section 4 in each line employs several water-cooled cold crimping machines, and the third mobile roller table of each water-cooled cold crimping machine extends from the internal crimping work station toward the entrances on both sides and is exposed to the outside, and the third mobile roller tables exposed to the outside of adjacent water-cooled cold crimping machines are butted together, and similarly intermittent depressurization is performed on the third mobile roller tables exposed to the outside where the wooden boards are butted together. The heating temperature and operating pressure parameters in each water-cooled cold crimping machine are determined based on the compression ratio achieved by the wooden board in the corresponding water-cooled cold crimping machine, and the compression ratio of the wooden board achieved by the multiple water-cooled cold crimping machines from upstream to downstream increases in stages. A low-temperature water-cooling device for cooling the support members is attached to the high-frequency crimping work station of each water-cooled cold crimping machine at this stage of the operation. The water-cooled cold crimping wood laying section 4 shown in Figure 5 employs four water-cooled cold crimping machines 401, 402, 403, and 404. Low-temperature water-cooling equipment is installed corresponding to each of the four water-cooled cold crimping machines 401, 402, 403, and 404. The operating pressure of the four water-cooled cold crimping machines 401, 402, 403, and 404 is the same, as is the operating pressure of the three high-frequency hot crimping machines 301, 302, and 303. In one preferred embodiment, the operating pressure of the four water-cooled cold crimping machines 401, 402, 403, and 404 is 2300 T (tons).

[0045] The saturated water-cooled pressure welding sections 5 in each line are connected in series using several water-cooled pressure welding machines, and the water-cooled pressure welding machines can be water-cooled machines commonly used in the field. Figure 6 shows one specific example in which the saturated water-cooled pressure welding sections 5 are connected in series using eight water-cooled pressure welding machines, the same crimping power supply is attached to adjacent water-cooled pressure welding machines, and each of the four water-cooled pressure welding machines is supplied with water using the same water-cooled machine. In one preferred technical solution, the operating pressure of the eight water-cooled pressure welding machines is 60 T (tons).

[0046] In the example shown in Figure 6, the saturated water-cooled pressure welding section 5 includes a welding mechanism and a water cooler. Since the technical means of the welding mechanism and water cooler are conventional in this art, a detailed explanation of the drawings is omitted.

[0047] As shown in Figure 7, the first conveying stage 6 is installed vertically downstream of the saturated water-cooled pressure welding section 5 of multiple lines, and abuts against the upstream roller table of the air-cooled roller table section 7 at the other end of the saturated water-cooled pressure welding section 5. A mechanical pusher is installed at this end to push the wooden boards against the air-cooled roller table section 7. The first conveying stage 6 is a vertical moving stage and is used to move the water-cooled wooden boards vertically to abut against the air-cooled roller rail section 7 at one end.

[0048] The air-cooled roller table section 7 consists of an air-cooling mechanism mounted in series with multiple air-cooled mobile roller tables, preferably 10 units.

[0049] As shown in Figure 8, the discharge section 9 includes a discharge moving roller table stage 90 and a discharge pickup mechanism. The discharge pickup mechanism is installed at the top of the discharge moving roller table stage 90 and extends upward on the upstream side of the moving roller table stage, above the moving roller table that is closer to the downstream side of the curing roller table section 8. The discharge pickup mechanism can employ a manipulator or a suction mechanism, and the specific structure of the suction mechanism is as described above. The downstream end of the curing roller rail section 8 abuts against the second transport stage 10 and is used to transport the discharged trays to the upstream side of the production line.

[0050] The second transport stage 10 is installed vertically, and one side abuts against the downstream end of the curing roller table section 8 and the side of the supply section 1 that is offset from the preheating section 2. A mechanical pusher is installed at the point where it abuts against the side of the supply section 1 to push the tray onto the movable roller table stage of the supply section 1, and is used to wait for the next cycle of wooden board supply.

[0051] All moving roller tables in the entire production line are transported using a conveyor roller system.

[0052] Based on the above assembly line equipment, the first time interval between preheating is 5 to 10 seconds between each high-frequency preheater in the preheating section using an externally exposed roller table, the second time interval between processing the wood board in the corresponding process between each high-frequency hot crimping machine in the high-frequency hot crimping section is 20 to 30 seconds, and the second time interval between processing the wood board in the corresponding process between each water-cooled cold crimping machine in the water-cooled cold crimping wood laying section is 20 to 30 seconds. The high-frequency hot crimping section includes three high-frequency hot crimping machines, with equal hot crimping interval times, and the temperature and compression rate of the wood board are progressive. The present invention does not specifically limit the range of the progression of temperature and compression rate. The water-cooled cold crimping wood laying section includes four water-cooled cold crimping machines, with equal cold crimping interval times, and the compression rate of the wood board is progressive. In the compaction process of the wooden boards in the above-mentioned device, the compression ratio is increased in stages, achieving a sequential increase in the temperature and compression ratio of the wood. This allows for maximum evaporation and removal of moisture from the wood cell walls without the need for an upper compression plate, thus preventing springback.

[0053] In the production line of this invention, it is the support member (i.e., the raw timber board is placed in the hot-pressing tray) rather than the upper crimping plate that flows. The advantages of this design are that it is easy to feed and discharge, simplifies the structural complexity of the crimping plate, and does not require contact with the heating or cooling unit of the crimping machine. Because there is no upper crimping plate, based on the general understanding of the prior art over many years, it is not possible to "maintain pressure" between the equipment units (the upper surface of the timber board cannot pass directly through the "conveyor group"), which is disadvantageous in preventing springback. Surprisingly, even without an upper crimping plate, the sequential equipment compaction step of this invention allows the flowing support member of this application, combined with the "sequential" compaction technique, to achieve technical effects similar to, and even better than, the "sandwich-type rotating structure" of the prior art (timber board sandwiched between upper and lower crimping plates, with the hot-pressing tray corresponding to the upper and lower crimping plates) and "conventional high-frequency conditions" in terms of preventing springback.

[0054] Furthermore, since the "hot-pressed tray flow structure" of the present invention is not limited to the upper pressing plate, its production applicability is broader and it can be applied to various types of wood, such as logs, poplar, and birch, and can also be applied to non-log materials.

[0055] In the sequential compaction technology of the present invention, the compression ratio at each stage of the wood board is strictly limited, and therefore, thickness measuring sensors for measuring the thickness of the wood board are installed at the location of each equipment unit of the preheating section, high-frequency hot-pressing section, and water-cooled cold-pressing wood laying section. Measuring the thickness of the wood board before preheating is also important. In some improved examples, as shown in Figure 9, a moisture content measuring section 80 is further installed upstream of the supply section of the flow line, which is used to install a moisture content meter to perform a moisture content test on the wood and install a thickness measuring sensor to measure the thickness of the template. The moisture content testing section 80 consists of a roller conveying stage module and measuring equipment installed in the roller conveying stage module, which includes a test stage 82, a sorting stage 83, and output stages 84 for rejected products and 85 for approved products.

[0056] The test stage 82 is a vertical roller conveyor, which is installed on the upstream side of the sorting stage 83. A microwave moisture content meter antenna 86, a thickness measuring sensor 87, and a width measuring encoder 88 are attached to the roll side of the test stage 82 via measuring brackets. The sorting section 83 is a horizontal roller conveyor, and both the output stage 84 for rejected products and the output stage 85 for accepted products are vertical roller conveyors. The downstream side of the sorting stage 83 is connected to the preheating section. A length measuring encoder 89 is attached to the end of the sorting stage 83 corresponding to the upstream end of the test stage 82 and is used to measure the length of the wood that has passed through. A lifting pinch roller is further installed at the upstream end of the sorting stage 83 and is used to pinch the wood boards upstream of the sorting stage 83 to the middle. An output stage 84 for rejected products is installed on the middle side of the sorting stage 83, and an output stage 85 for accepted products is installed on the downstream side of the sorting stage 83. A lifting pusher is installed in the sorting stage 83 at positions corresponding to the output stage 84 for rejected products and the output stage 85 for accepted products, and is used to push wooden boards of the corresponding quality to the corresponding output stages.

[0057] The measurement flow of the moisture content measuring unit 80 includes: 1) measuring the moisture content; 2) measuring the thickness with a thickness measuring sensor; 3) measuring the width using a width measuring encoder as the product passes the position of the thickness measuring sensor; 4) measuring the length at the position of the lifting pinch roller; 5) calculating the moisture content using the values ​​from steps 2-4; and 6) separating the products into NG products and OK products based on the moisture content value.

[0058] As further explanation is needed, the "high-frequency compaction method" of the present invention is a wood reinforcement treatment method that involves heating wood with a high-frequency voltage, compressing and compacting the wood as a whole at a constant compression ratio, and rapidly cooling the wood under constant low-temperature conditions. The wood after compression reinforcement is called high-frequency compacted wood. This [high-frequency compaction method] involves heating the wood with a high-frequency medium heating device (applying high-frequency voltage), compressing and compacting the wood as a whole with a hydraulic press (applying a compression ratio), and rapidly cooling the wood with a cooling device (supplying a temperature medium such as water) (natural cooling using air as a temperature medium is also possible). In this assembly line equipment structure, steps such as heating, compaction, and cooling can be performed simultaneously or separately depending on the situation. When the high-frequency heating step and the compression compaction step are performed simultaneously, the same high-frequency medium hot compaction machine can be used. When the high-frequency heating step and the compression compaction step are not performed simultaneously, the compression compaction step can be performed independently in a cold compaction machine. When the compression compaction step and the rapid cooling step are performed simultaneously, the same water-cooled cold compaction machine can be used. When the compression compaction step and the rapid cooling step are not performed simultaneously, the rapid cooling step can be performed independently using a water-cooling device. Here, the high-frequency heating step includes heating and softening, heating and raising the temperature, or heating and hardening, and is determined according to the specific high-frequency compaction process of the wood. Softening is generally done to increase the plasticity of the wood, and hardening and rapid cooling (quenching) are generally done to improve the physical properties of the high-frequency compacted wood.

[0059] In a technical solution for realizing a sequential structure based on the above assembly line, a third aspect of the present invention discloses a high-frequency consolidation method in which wood is laid down sequentially, and the method comprises at least, In the high-frequency hot crimping process, the preheated support member is sequentially placed into several hot crimping machines for multiple hot crimping cycles. The compression ratio of the wooden board increases progressively after each hot crimping cycle according to the hot crimping sequence. The second time interval between the end of hot crimping in the previous hot crimping machine and the start of hot crimping in the next hot crimping machine is 20-30 seconds. In a water-cooled cold crimping wood curing process, the support members after hot crimping are sequentially placed into several water-cooled cold crimping machines for multiple water-cooled cold crimping cycles, the temperature of the wood board decreases gradually after cold crimping in each water-cooled cold crimping machine according to the cold crimping sequence, the compression ratio of the wood board increases gradually after cold crimping in each water-cooled cold crimping machine according to the cold crimping sequence, and the interval between the end of cold crimping in the previous water-cooled cold crimping machine and the start of cold crimping in the next water-cooled cold crimping machine is 20-30 seconds.

[0060] One improved method includes an additional preheating treatment before the high-frequency hot crimping step, in which the support member is sequentially entered into several preheaters for multiple preheating cycles, and the first time between the end of preheating in the previous preheater and the start of preheating in the next preheater is 5 to 20 seconds.

[0061] One improved method involves performing a water-cooled cold-pressure welding process on the wooden board, followed by saturated water-cooled pressure welding, air cooling, and curing steps.

[0062] In this invention, the compression ratio refers to the percentage after the raw timber has been compressed, i.e., compression ratio = (thickness of raw timber - thickness of compressed timber) / thickness of raw timber × 100%, and in this application, the raw timber to which the compression ratio applies is based on raw timber cut before preheating treatment. In this invention, the compression ratio refers to the percentage after the raw timber has been compressed, and the compression ratio = (thickness of raw timber - thickness of compressed timber) / thickness of raw timber, and in this application, the raw timber to which the compression ratio applies is based on raw timber cut before preheating treatment.

[0063] Based on the above method principle, the sequential high-frequency consolidation method in which wood is laid flat will be specifically described below with reference to examples. [Examples]

[0064] Cut the logs into appropriately sized planks, with a log density of 0.5-0.6 g / cm³. 3 The average moisture content was controlled to about 10%, and the wooden boards were placed in the shallow grooves of the tray to form a support member. The support member was then placed in the sequential high-frequency consolidation flow line of the present invention, and the following process steps were performed.

[0065] 1) In the preheating process, the support members were placed in a preheating device and preheated until the temperature reached 100-130°C. The preheating time was 20-30 seconds, and the compression ratio of the wooden boards was 15-25%.

[0066] 2) In the high-frequency hot crimping process, the preheated support members were sequentially placed into three hot crimping machines for hot crimping. In each machine, the high-frequency heating temperature was increased to 140-160°C and held for 2-4 minutes, then increased to 160-180°C and held for 2-4 minutes, and finally increased to 180-200°C and held for 1.5-3 minutes. The pressure of each machine was 2300 T (tons). The compression ratio of the wooden boards increased progressively after each hot crimping machine treatment according to the hot crimping sequence, with compression ratios of 30-40%, 40-50%, and 50-60%, respectively. The second time interval between the end of hot crimping in the previous hot crimping machine and the start of hot crimping in the next hot crimping machine was 20-30 seconds.

[0067] 3) In the water-cooled cold-pressing wood curing process, the support members after hot-pressing are placed in four water-cooled cold-pressing machines for cold-pressing. Each machine is used sequentially for 3-6 minutes of cold-pressing, and the temperature of the wood boards decreases in stages according to the cold-pressing sequence. The temperatures of the wood boards after cold-pressing in each machine are 160-180°C, 140-160°C, and 120-140°C respectively. The temperature was 100-120°C, and the pressure of all water-cooled cold crimping machines was 2300 T (tons). The compression ratio of the wooden board increased stepwise after cold crimping in each water-cooled cold crimping machine according to the water-cooled cold crimping sequence, with the compression ratio of the wooden board increasing by 3-5% at each stage. The third time between the end of cold crimping in the previous water-cooled cold crimping machine and the start of cold crimping in the next water-cooled cold crimping machine for the support member was 20-30 seconds.

[0068] 4) In saturated water-cooled pressure welding, the support members after cold-pressing treatment entered the production line of the water-cooled pressure welding equipment for cold-pressing and hardening. The equipment pressure was 60T, the processing time was 25-35 min, and the wood boards were cooled until the average temperature reached 70-80°C. [Examples]

[0069] The steps were the same as in Example 1, the only difference being the preheating treatment in step 1). The steps of the improved process are as follows:

[0070] 1) In the preheating process, the support members were sequentially placed in three preheaters for preheating. Each preheater was sequentially heated to a high-frequency temperature of 80-90°C for 8-12 seconds, then to 100-110°C for 8-12 seconds, and finally to 120-130°C for 4-6 seconds. The compression ratio of the wooden boards increased in stages after each preheater treatment according to the hot-pressing sequence, with the compression ratios being 15-20%, 20-25%, and 25-30%, respectively. The first heating interval between adjacent high-frequency preheaters was 5-20 seconds.

[0071] Based on the method of Example 2 described above, wood compaction is performed according to the following specific parameter settings, and the wood board temperature below refers to the temperature at which the wood board is heated in the equipment to the set temperature.

[0072] [Table 1] TIFF2026058960000003.tif85166 [Examples]

[0073] The sequential high-frequency consolidation method for laying wood down includes the following steps in addition to the steps of Example 2.

[0074] In the air cooling process, the wooden boards were treated using air cooling technology after saturated water-cooled pressure welding. The surface temperature of the wooden boards after air cooling was lower than 60°C, the air temperature was 10°C-15°C, and the wind speed was 20m / s-25m / s.

[0075] During the curing process, the support members, after air cooling, were circulated within a curing machine and allowed to equilibrium at room temperature for 11-13 days.

[0076] Controlled Study Example 1 In Example 2, compacted wood was manufactured based on steps 1)-4) of the method described above, with the following differences: The equipment for the preheating treatment, high-frequency hot crimping treatment, and water-cooled cold crimping wood curing treatment steps was connected in series without any gaps between them, and after processing in each piece of equipment, the wood went directly to the next piece of equipment without any breaks, and the equipment parameters adopted were the same as those described in Example 1-1.

[0077] Steps 1)-4) of the aforementioned process are specifically as follows:

[0078] 1) In the preheating process, the support members were sequentially placed into three high-frequency preheaters connected in series without any gaps to perform preheating. High-frequency heating was performed and held for 20 seconds, causing the temperature of the wooden boards to reach 120-130°C and the compression ratio of the wooden boards to 30%.

[0079] 2) In the high-frequency hot crimping process, the preheated support members were placed sequentially into three hot crimping machines connected in series without any gaps, and hot crimping was performed. High-frequency pressure was applied and held for 8 minutes, the temperature of the wooden boards reached 180-200°C, the pressure of each machine was 2300 T (tons), and the compression ratio of the wooden boards was reduced to 60%.

[0080] 3) In the water-cooled cold crimping wood laying process, the support members after the hot crimping process were placed in four water-cooled cold crimping machines connected in series without any gaps for cold crimping, and then high-frequency water cooling was performed and held for 8 minutes. The wood board temperature reached 100-120°C, and the pressure of each machine was 2300 T (tons), resulting in a compression ratio of 72% for the wood board.

[0081] 4) In saturated water-cooled pressure welding, the support members after cold-pressing treatment entered the production line of the water-cooled pressure welding equipment to be cold-pressed and hardened. The equipment pressure was 60T, the processing time was 25-35 min, and the wood boards were cooled until the average temperature reached 75°C. [Examples]

[0082] Patent Document 6 (published on July 17, 2020) describes the method of Example 1 for processing the support member of the present invention, but differs in the following ways: Step 2) "heat compression treatment", Step 3) "hardening treatment", and Step 4) "cooling treatment" are set as sequential processes in the assembly line equipment of the present invention. The number of high-frequency hot crimping equipment was adjusted and installed in the assembly line according to the requirements of the steps. The specific method is as follows.

[0083] 1) In the pretreatment process, wooden boards with a density ρ=0.6 were pretreated to control the average moisture content of the wooden boards to 10%, and the wooden boards were placed in the shallow grooves of the tray to form the support members.

[0084] 2) In the heat compression process, the pre-treated support members were sequentially placed into three high-frequency hot crimping machines for hot crimping. Each machine was sequentially heated to a high-frequency temperature of 100°C and held for 2.5 minutes, then heated to 100°C and held for 2.5 minutes, and heated to 100°C and held for 2 minutes. Adjacent high-frequency heating substeps were spaced 20 seconds apart, and the compression rates of the wooden boards were 41%, 43%, and 45%, respectively.

[0085] 3) In the curing process, the support members after hot-pressing were sequentially placed into three high-frequency hot-pressing machines for hot-pressing. Each machine was sequentially heated to a high-frequency temperature of 180°C and held for 3 minutes, then heated to 180°C and held for 3 minutes, then heated to 180°C and held for 2 minutes, with a second interval of 20 seconds between adjacent high-frequency heating substeps.

[0086] 4) In the cooling process, the hardened support members were sequentially placed into four water-cooled cold crimping machines to cool until the average temperature of the wooden boards reached 70°C. The compression ratio of the wooden boards remained at 45% after cold crimping in each machine, and the third time between cold crimping in adjacent water-cooled cold crimping machines was 20 seconds.

[0087] 5) In the curing process, the cooled wood was placed on a horizontal, dry surface, and a pressure of 5.5 MPa was applied to the top surface of the wood for 3 days. Then, the pressure was reduced by 1.2 MPa per day and curing continued for 10 days until the pressure became 0.

[0088] Controlled study example 2 The support member of the present invention was processed by the method of Example 1 in Patent Document 6 (published on July 17, 2020), that is, the pre-treated wooden board was placed in the shallow groove of the tray to form the support member, and high-frequency consolidation was performed on the support member using a non-sequential device, such as the high-frequency consolidation device of Patent Document 7 (March 12, 2019). [Examples]

[0089] The support member of the present invention is processed using the method of Example 1 of Patent Document 8 (2014.4.30), with the following differences: Steps 2) to 5) are set to be processed sequentially using the assembly line equipment of the present invention. The number of high-frequency hot crimping equipment is adjusted and installed on the assembly line according to the requirements of each step. The specific method is as follows.

[0090] 1) In the pretreatment, wooden boards with a density ρ=0.6 were pretreated to control the average moisture content of the wooden boards to 18%, and the wooden boards were placed in the shallow grooves of a tray to form a support member. The support member was placed in a high-frequency hot crimping machine and preheated to a preheating temperature of 180°C for a preheating time of 2 seconds.

[0091] 2) The support members were subjected to a first high-frequency hot-pressing process after preheating. The support members were then placed in three hot-pressing machines in sequence for hot-pressing. Each machine was sequentially heated to a high-frequency temperature of 100°C and held for 2 minutes, then heated to 100°C and held for 2 minutes, and then heated to 100°C and held for 1 minute, with a 20-second interval between adjacent high-frequency heating substeps.

[0092] 3) After heating, the support members were sequentially placed into three high-frequency hot crimping machines for hot crimping. Each machine was sequentially heated to a high-frequency temperature of 140°C and held for 2 minutes, then heated to 160°C and held for 2 minutes, and finally heated to 180°C and held for 2 minutes. Adjacent high-frequency heating substeps were spaced 20 seconds apart, and the compression ratios of the wooden boards were 40%, 45%, and 50%, respectively.

[0093] 4) A second high-frequency hot-pressure treatment was performed on the compressed support members. The support members were sequentially placed into three hot-pressure machines for hot-pressure, with the high-frequency heating temperature raised to 180°C and held for 8 minutes, then raised to 180°C and held for 7 minutes, and so on, with a 20-second interval between adjacent high-frequency heating substeps.

[0094] 5) The support members were sequentially placed into four water-cooled cold crimping machines to cool until the average temperature of the wooden boards reached 60°C. The compression ratio of the wooden boards remained at 50% after cold crimping in each machine, and the third time between cold crimping in adjacent water-cooled cold crimping machines was 20 seconds.

[0095] Controlled study example 3 The support member of the present invention was processed by the method of Example 1 of Patent Document 8 (2014.4.30), that is, the pre-treated wooden board was placed on the support member formed by the shallow groove of the tray, and high-frequency consolidation was performed on the support member using a non-sequential device, such as the high-frequency consolidation device of Patent Document 7 (2019.03.12). The non-sequential device in this example did not have butt-moving rails between the devices, unlike the technical solution of the present invention which involves installing butt-moving rails between multiple heating and consolidation devices.

[0096] Test comparison results 1. Comparison of a sequential wood-laying high-frequency compaction method and the prevention of springback in known high-frequency compaction methods. Referring to GB / T1934.1-2009 "Method for Measuring Wood Water Absorption," the water absorption rates (%), water absorption difference (%), and water absorption thickness expansion rate (%) of the provided compressed wood boards were measured. The detection results are shown in Table 2. The average water absorption rate (%), water absorption rate difference (%), and water absorption thickness expansion rate (%) were measured for 6 hours. The average water absorption rate was the average value of the water absorption rates measured on the upper and lower surfaces of the compressed wood board, with thicknesses of 2 cm, 4 cm, 5 cm, 6 cm, and 8 cm, respectively (when measuring the water absorption rate of a specific thickness, processing by methods such as cutting or drilling can be used, followed by measurement). The water absorption rate difference was the difference between the maximum and minimum values ​​of the measured water absorption rates. The water absorption thickness expansion rate (%) was calculated as (thickness before immersion - thickness after immersion) / thickness before immersion.

[0097] [Table 2]

[0098] The average water absorption rate (%) of the high-frequency compressed wood in Examples 1, 2-1, 2-2, 2-1, and Control Test Example 1 at 6h was less than 0.70%, and both the water absorption rate difference (%) and the water absorption thickness expansion rate (%) were significantly better than the indicators in Control Test Example 1.

[0099] The average water absorption rate (%) of the high-frequency compressed lumber in Example 4 after 6 hours was 0.70%, the water absorption difference (%) was 0.23%, and the water absorption thickness expansion rate (%) was 0.47%, all of which are superior to the indicators in Example 1 of CN111421633A (2020, 07, 17), where the water absorption thickness expansion rate (%) decreases by approximately 1x. The indicators in Control Test Example 2 lag behind those in Example 4, indicating that when using the support member of the present invention, the sequential method steps can better solve the problem of springback.

[0100] The average water absorption rate (%), water absorption rate difference (%), and water absorption thickness expansion rate (%) of the high-frequency-consolidated wood in Example 5 were all significantly better than the indicators in Control Test Example 3, similarly demonstrating that the support member of the present invention is suitable for sequential consolidation methods.

[0101] The main chemical components of wood are cellulose, hemicellulose, and lignin (three cellulose fibers). If the cellulose, hemicellulose, and lignin in compressed wood form a large number of hydrogen bonds, the compressed wood will be less resilient than regular wood. In the sequential high-frequency compaction method of the present invention, which involves laying wood down, multiple high-frequency heating substeps, multiple compression compaction substeps, and / or multiple rapid cooling steps are included, so that cellulose molecules, hemicellulose molecules, and lignin molecules can be woven and stretched multiple times, and a larger number of hydrogen bonds can be formed between them. In addition, the microstructure of the three cellulose fibers is woven more tightly, so that water molecules can be better locked in, and when high-frequency compacted wood absorbs moisture, it can better resist the breakdown of hydrogen bonds by moisture. The above describes the principle of laying wood down in the present invention.

[0102] 2. Comparison of the production efficiency of a sequential wood-laying high-frequency compaction method and known high-frequency compaction methods. A static operating point in an assembly line is an operating position in each work unit of the assembly line where a support member must stop and be processed rather than continuing to move through the work unit. For example, when heating wood with a high-frequency heating device or when compressing wood entirely with a hydraulic press, the support members must stop and be processed at these operating positions and cannot continue to move through the line.

[0103] A dynamic operating point in an assembly line is an operating position in each work unit of the assembly line where a support member can move and pass through the work unit without stopping to process it. Examples include the air-cooled roller table section and the curing roller table section.

[0104] As can be seen by comparing the method of the embodiment of the present invention with the process of Patent Document 6 (2020, 07, 17), the embodiment of the present invention divides the "high-frequency heating step" into multiple high-frequency heating substeps and the "compression and compaction step" into multiple compression and compaction substeps, the production line is a cyclical operation, and both the "high-frequency heating step" and the "compression and compaction step" are static operating points in the flow line. Therefore, the sequential high-frequency compaction method of the embodiment, in which the wood is laid down, improves production efficiency by more than three times compared to conventional high-frequency compaction methods.

[0105] The "sequential wood laying high-frequency consolidation method" of the present invention divides a high-frequency heating step that can be completed in one step into multiple high-frequency heating substeps that are completed sequentially at regular time intervals, divides a compression consolidation step that can be completed in one step into multiple compression consolidation substeps that are completed sequentially at regular time intervals, and divides a rapid cooling step that can be completed in one step into multiple rapid cooling steps that operate at regular time intervals and completes sequentially. Within the "regular time intervals," the processes applied to the wood in the corresponding steps, such as heating, pressurizing, and water cooling, are released. The "sequential wood laying high-frequency consolidation method" of the present invention is very suitable for placement in the "sequential wood laying high-frequency consolidation apparatus" of the present invention, which, assuming a simplification of support members, can maintain the mechanical performance of wood board consolidation and avoid springback through the apparatus and the process of the apparatus.

[0106] The above-described technical solution is merely one embodiment of the present invention, and those skilled in the art can easily make various improvements or modifications after the disclosure of the principle of the present invention. The present invention is not limited to the technical solution described in the above-described specific embodiment, and therefore the previously described examples are preferred and not limiting.

Claims

1. The operating equipment includes operating devices and support members, and the operating equipment includes a preheating section, a high-frequency hot crimping section, and a water-cooled cold crimping wood laying section, which are connected in order. The aforementioned high-frequency hot crimping section includes several high-frequency hot crimping machines, the second mobile roller table of each high-frequency hot crimping machine extending from the internal hot crimping work station toward the entrances on both sides and exposed to the outside, and the second mobile roller tables of adjacent high-frequency hot crimping machines that are exposed to the outside abut against each other. The water-cooled cold crimping wood laying section includes several water-cooled cold crimping machines, the third mobile roller table of each water-cooled cold crimping machine extending from the internal crimping work station toward the entrances on both sides and exposed to the outside, and the third mobile roller tables of adjacent water-cooled cold crimping machines exposed to the outside abut against each other. The support member includes a tray and a wooden board it supports, and when the support member is supported and moved by a movable roller table, the thickness direction of the wooden board is not constrained by the operating device. A high-frequency consolidation flow line characterized by a sequential laying method for wood.

2. The preheating section includes several preheaters, the first mobile roller table of each preheater extends from the internal preheating work station toward the entrances on both sides and is exposed to the outside, and the first mobile roller tables of adjacent preheaters that are exposed to the outside are butted together, characterized in that the sequential high-frequency consolidation flow work line for laying wood is as described in claim 1.

3. The aforementioned operating device further includes a supply unit, a saturated water-cooled pressure welding unit, a first conveying stage, a second conveying stage, an air-cooled roller table unit, a curing roller table unit, and a discharge unit. The supply unit, preheating unit, high-frequency hot-pressing unit, water-cooled cold-pressing wood laying unit, and saturated water-cooled pressure welding unit are installed in a first straight line in the forward direction, the air-cooled roller table unit, curing roller table unit, and discharge unit are installed in a second straight line in the reverse direction, one side of the first conveying stage is installed downstream of the saturated water-cooled pressure welding unit and the other side is installed upstream of the air-cooled roller table unit, one side of the second conveying stage is installed downstream of the discharge unit and the other side is installed upstream of the supply unit. The high-frequency consolidation flow line for sequentially laying down wood, as described in feature 1.

4. The supply unit includes a wooden board supply stage, a movable roller table stage, and a wooden board pickup mechanism. One side of the wooden board supply stage abuts against the movable roller table stage, the wooden board supply stage is a translational roller table used to transport wooden boards to the movable roller table stage, the wooden board pickup mechanism is installed on the top of the movable roller table stage and extends outward above the abutting side of the wooden board supply stage on the upstream side of the movable roller table stage, the wooden board pickup mechanism employs a suction cylinder and a gas nozzle, The discharge section includes a discharge moving roller table stage and a discharge pickup mechanism, the discharge pickup mechanism is installed on the top of the discharge moving roller table stage and extends outward on the upstream side of the moving roller table stage above the moving roller table that is closer to the downstream side of the curing roller table section, the downstream end of the curing roller table section abuts against the second transport stage, and the discharge pickup mechanism employs an adsorption cylinder and a gas nozzle, characterized in that the sequential high-frequency consolidation flow work line for laying wood down is as described in claim 3.

5. The first conveying stage is installed vertically downstream of the saturated water-cooled pressure welding section of multiple lines, and abuts against the upstream roller table of the air-cooled roller table section at the other end of the saturated water-cooled pressure welding section. A mechanical pusher is installed at this end to push the wooden board to the air-cooled roller table section. The first conveying stage is a vertically moving stage and is used to move the water-cooled wooden board vertically to the air-cooled roller rail section at one end. The second transport stage is installed in the vertical direction, and one side abuts against the downstream end of the curing roller rail section and the side offset from the preheating section of the supply section, respectively, and a mechanical pusher is installed at the point where it abuts against the side of the supply section to push the tray onto the movable roller table stage of the supply section, characterized in that a sequential high-frequency consolidation flow line for laying wood is described in claim 3.

6. The sequential high-frequency consolidation flow line for laying wood, according to claim 3, is characterized in that several parallel-arranged first straight lines are installed between the supply unit and the first conveying stage, and the preheating unit, high-frequency hot-pressing unit, water-cooled cold-pressing wood laying unit and saturated water-cooled pressure welding unit are installed in order on each of the first straight lines.

7. A shallow groove is provided on the side of the tray facing the wooden board, the shape of which conforms to the shape of the wooden board, a water guide groove is provided on the side of the tray facing the wooden board along the transverse and / or longitudinal directions, and a water guide hole is provided at the position of the water guide groove that penetrates the entire tray. The high-frequency consolidation flow line for sequentially laying down wood, as described in feature 1.

8. In the high-frequency hot crimping process, the preheated support member is sequentially placed into several hot crimping machines for multiple hot crimping cycles. The compression ratio of the wooden board increases progressively after each hot crimping cycle according to the hot crimping sequence. The second time interval between the end of hot crimping in the previous hot crimping machine and the start of hot crimping in the next hot crimping machine is 20-30 seconds. In a water-cooled cold-pressing wood curing process, the support members, after hot-pressing, are sequentially placed in several water-cooled cold-pressing machines for multiple water-cooled cold-pressing cycles, the temperature of the wood board decreases gradually after cold-pressing in each water-cooled cold-pressing machine according to the cold-pressing sequence, the compression ratio of the wood board increases gradually after cold-pressing in each water-cooled cold-pressing machine according to the cold-pressing sequence, and the interval between the end of cold-pressing in the previous water-cooled cold-pressing machine and the start of cold-pressing in the next water-cooled cold-pressing machine is 20-30 seconds, and this process includes at least the following steps: A consolidation method that applies the sequential high-frequency consolidation flow line described in feature 1, wherein the wood is laid down in sequence.

9. The sequential high-frequency consolidation flow line for laying wood, according to claim 8, further includes a preheating treatment before the high-frequency hot-pressing step, wherein the support member enters several preheating machines in sequence to undergo multiple preheating cycles, and the first time from the end of preheating in the previous preheating machine to the start of preheating in the next preheating machine for the support member is 5 to 20 seconds.

10. 1) In the preheating process, the support members are sequentially placed in three preheaters for preheating, with each being sequentially heated to a high-frequency heating temperature of 80-90°C for 8-12 seconds, then to 100-110°C for 8-12 seconds, and finally to 120-130°C for 4-6 seconds. The compression ratio of the wooden boards increases stepwise after each preheater treatment according to the hot-pressing sequence, with the compression ratios being 15-20%, 20-25%, and 25-30%, respectively. The first heating interval between adjacent high-frequency preheaters is 5-20 seconds. 2) In the high-frequency hot crimping process, the preheated support members are sequentially placed into three hot crimping machines for hot crimping, with the high-frequency heating temperature raised to 140-160°C and held for 2-4 mins, then to 160-180°C and held for 2-4 mins, and finally to 180-200°C and held for 1.5-3 mins. The compression ratio of the wooden boards increases stepwise after each hot crimping machine treatment according to the hot crimping sequence, with the compression ratios being 30-40%, 40-50%, and 50-60%, respectively. The second time between the end of hot crimping in the previous hot crimping machine and the start of hot crimping in the next hot crimping machine is 20-30 seconds. 3) In the water-cooled cold-pressing wood curing process, the support members after hot-pressing are placed in four water-cooled cold-pressing machines for cold-pressing, with each machine performing cold-pressing for 3-6 minutes in sequence. The temperature of the wood boards decreases in stages after cold-pressing in each machine according to the cold-pressing sequence, with the temperatures of the wood boards after cold-pressing being 160-180°C, 140-160°C, 120-140°C, and 100-120°C respectively. The compression ratio of the wood boards increases in stages after cold-pressing in each machine according to the water-cooled cold-pressing sequence, with the compression ratio increasing by 3-5% at each stage. The third time interval between the end of cold-pressing in the previous water-cooled cold-pressing machine and the start of cold-pressing in the next water-cooled cold-pressing machine for the support members is 20-30 seconds. 4) In saturated water-cooled pressure welding, the support member after cold-pressing treatment enters the production line of the water-cooled pressure welding equipment to be cold-pressed and cured, the pressure of the equipment is 60T, the processing time is 25-35 min, and the process includes the step of cooling until the average temperature of the wooden board reaches 70-80°C. A consolidation method that applies the sequential high-frequency consolidation flow line described in feature 1, wherein the wood is laid down in sequence.

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