A wood board steam preheating and hot pressing integrated device and a use method thereof

Abstract

The present application relates to the technical field of artificial board manufacturing process research and experimental equipment, and particularly discloses a wood board steam preheating and hot pressing integrated device and a use method thereof, which comprises a hot press, a preheating assembly, a sealing support, a sealing frame and a conveying assembly. The hot press comprises a lower hot pressing plate and an upper hot pressing plate which are oppositely arranged and can be independently lifted respectively, and a hot pressing station for placing a board blank is formed between the lower hot pressing plate and the upper hot pressing plate. The preheating assembly comprises a steam spraying plate and a negative pressure plate. The steam spraying plate and the negative pressure plate can be independently lifted respectively. The steam spraying plate and the negative pressure plate are oppositely arranged, and a preheating station for placing a board blank is formed between the steam spraying plate and the negative pressure plate. The steam spraying plate is communicated with a steam generator. When the two U-shaped sealing parts clamp the sealing support, the shaking, pulling or relative displacement of the board blank during the steam preheating, negative pressure suction and transfer process can be reduced, and the stability and continuity of the detection data output of the internal temperature and moisture content of the board blank can be improved.

Description

Technical Field

[0001] This invention relates to the field of research and experimental equipment technology for engineered wood products manufacturing processes, specifically to an integrated steam preheating and hot pressing device for wood-based panels and its usage method. Background Technology

[0002] With the continuous improvement of environmental standards in the engineered wood products industry, low-formaldehyde-emission or even formaldehyde-free engineered wood products have become an important development direction. To meet high environmental protection requirements such as ENF level, environmentally friendly adhesives such as isocyanate adhesives are gradually being used in production. However, these adhesives usually have problems such as slow curing speed, delayed core layer heating, and long hot-pressing cycles. Traditional processes that rely solely on heat transfer through hot press plates cannot balance curing efficiency, energy consumption, and board performance.

[0003] Steam preheating combined with hot pressing technology can preheat the slab with steam spray before hot pressing, rapidly raising the temperature of the core layer and utilizing the moisture carried by the steam to promote the pre-curing of the adhesive, thereby shortening the hot pressing time and improving the bonding performance within the slab. However, most existing small-scale laboratory hot pressing equipment only has heating and pressurization functions, making it difficult to simultaneously achieve steam preheating, negative pressure suction, hot pressing, and process data acquisition. Researchers often need to rely on industrial production lines for pilot-scale verification, which suffers from high testing costs, long cycles, inconvenient parameter adjustment, and insufficient data acquisition.

[0004] Furthermore, during steam preheating, if the slab perimeter lacks effective sealing, steam can easily leak from the slab edge or form a bypass airflow, causing the steam to fail to penetrate stably along the slab thickness direction, affecting preheating uniformity and the reliability of experimental results. Simultaneously, to study changes in internal temperature and moisture content of the slab, sensors are typically embedded inside. However, the sensor leads are prone to displacement, pulling, or sealing failure during slab preheating, transfer, and hot-pressing, resulting in unstable data output. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated steam preheating and hot pressing device for wood-based panels and its usage method, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an integrated steam preheating and hot pressing device for wood-based panels, comprising a hot press, a preheating component, a sealing bracket, a sealing frame, and a conveying component; The hot press includes a lower hot press plate and an upper hot press plate that are arranged opposite to each other and can be raised and lowered independently. A hot press station for placing slabs is formed between the lower hot press plate and the upper hot press plate. The preheating assembly includes a steam spray plate and a negative pressure plate; the steam spray plate and the negative pressure plate can be raised and lowered independently; the steam spray plate and the negative pressure plate are arranged opposite each other, and a preheating station for placing the slab is formed between them; the steam spray plate is connected to a steam generator, and the negative pressure plate is connected to a negative pressure device, so that steam penetrates the slab along the thickness direction of the slab located in the preheating station under the action of negative pressure suction. The preheating station is located on one side of the hot pressing station; The sealing bracket is positioned at the center of one side edge of the slab along the transverse direction. The sensor embedded inside the slab is led out from the center of one side edge of the slab along the transverse direction via a lead wire, and is sealed through the sealing bracket before being electrically connected to the controller. The sealing frame includes two U-shaped sealing parts with opposite openings. The two U-shaped sealing parts approach each other laterally under the action of the elastic element. While clamping the sealing bracket to limit the position of the lead wire relative to the slab, they cooperate with the sealing bracket to form a frame-shaped sealing structure around the periphery of the slab, so as to constrain and seal the periphery of the slab. The conveying assembly is used to transport the sealing frame and the slab constrained therein from the preheating station to the hot pressing station.

[0007] Preferably, two diagonal bars are provided on both longitudinal sides of the upper hot press plate. One end of the diagonal bar is rotatably connected to the upper hot press plate through a pin, and the other end of the diagonal bar is fixed with a push rod. Limiting blocks are fixed on both sides of the upper hot press plate to keep the diagonal bar at a predetermined tilt angle when it is in a free state. As the upper hot press plate moves toward the lower hot press plate, the push rod can push the two U-shaped sealing parts to gradually move away from each other laterally, so as to release the seal of the sealing frame on the periphery of the slab.

[0008] Preferably, the U-shaped sealing part includes a U-shaped plate and a U-shaped sealing gasket, wherein the U-shaped sealing gasket is fixedly disposed on the inner surface of the U-shaped plate; The U-shaped sealing gasket is inflatable, and each U-shaped plate has an inflatable component at one of its horizontal ends. As the upper hot press plate moves toward the lower hot press plate, the push rod first pushes the inflation assembly to absorb the air inside the U-shaped sealing gasket, causing the U-shaped sealing gasket to shrink and separate from the periphery of the blank. The push rod then pushes the two U-shaped sealing parts to gradually move away from each other laterally.

[0009] Preferably, the inflation assembly includes a plug, a piston, a fixing plate, and a support rod; One end of the plug is fixedly connected to the transverse end of the U-shaped plate, and the other end of the plug is connected to the U-shaped sealing gasket. The piston is slidably disposed inside the plug cylinder, and the periphery of the piston is sealed to the inner wall of the plug cylinder; The fixing plate is fixedly connected to the other end of the plug cylinder; One end of the support rod is fixedly connected to the piston, and the other end slides through the fixed plate; A first spring is sleeved on the support rod, and the two ends of the first spring abut against the piston and the fixed plate, respectively; A limit plate is fixed on the piston, and the position of the limit plate corresponds to that of the fixed plate, which is used to limit the maximum sliding stroke of the piston.

[0010] Preferably, a vertically arranged first baffle is fixedly connected to the other end of the support rod, and a horizontally arranged second baffle is fixedly connected to the side of the first baffle near the stopper cylinder, wherein the height of the upper surface of the second baffle does not exceed the height of the upper surface of the stopper cylinder.

[0011] Preferably, the conveying assembly includes a linear track component and a drive component; The linear track component includes a protective cover, a guide rod, and a guide sleeve. The protective cover is fixedly connected to the hot press, and the guide rod is fixedly connected inside the protective cover and extends laterally. The U-shaped sealing part is slidably connected to the guide rod through the guide sleeve; The elastic element is a second spring, and the two ends of the second spring are fixedly connected to two guide sleeves respectively.

[0012] Preferably, the drive components include a straight rod and a carriage; The carriage is arranged longitudinally and fixedly mounted on the protective cover; A straight rod is set horizontally and slides through the carriage. One end of the straight rod is fixedly connected to the U-shaped sealing part, and the other end of the straight rod is fixed with a handle. The straight rod is equipped with a first scale component and a second scale component; When the first graduated piece moves to the carriage, the sealing frame is in the preheating position; when the second graduated piece moves to the carriage, the sealing frame is in the hot pressing position.

[0013] Preferably, the sealing support includes a connecting frame, a trapezoidal block, and a flexible component; The flexible component is fixedly connected to the connecting frame via a trapezoidal block, and the end of the lead wire furthest from the sensor is led out from one end of the connecting frame. When the sealing frame seals the periphery of the slab blank, the flexible part is clamped in the middle by two U-shaped sealing pads, and the trapezoidal block is clamped in the middle by two U-shaped plates; The end of the U-shaped plate closest to the trapezoidal block is set to match the inclined surface of the trapezoidal block.

[0014] Preferably, a first micropore region and a second micropore region are respectively provided on the two plates that are close to each other, such that when the steam spray plate and the negative pressure plate press the slab, the upper and lower plates of the slab cover the first micropore region and the second micropore region respectively, so that steam enters the slab through the first micropore region and is discharged through the second micropore region under the suction of the negative pressure device.

[0015] A method of using an integrated steam preheating and hot pressing device for wood-based panels, the method comprising the following steps: S1. Constrain the slab between the two U-shaped sealing parts, and move the slab and the U-shaped sealing parts to the preheating station; S2. Use steam spray plates and negative pressure plates to press the slab tightly, and start the steam generator and negative pressure equipment to begin preheating the slab, while recording the data detected by the sensors. S3. After preheating is completed, turn off the steam generator and negative pressure equipment, and transport the sealing frame and the slab constrained inside it from the preheating station to the hot pressing station through the conveying assembly. S4. Use the lower and upper hot press plates to perform hot pressing and curing treatment on the slab, and record the data detected by the sensor at the same time.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention integrates a preheating component and a hot press, and uses a conveying component to transfer the slab between the preheating and hot pressing stations. This allows the slab to directly enter the hot pressing station for hot pressing after steam preheating, thus shortening the transfer path between preheating and hot pressing and improving the continuity and efficiency of the steam preheating and hot pressing process under laboratory conditions. The preheating component allows steam to penetrate the slab from the top surface to the bottom surface, improving the heating rate and preheating uniformity of the slab core layer. The sealing frame, in conjunction with the sealing bracket, seals the periphery of the slab, reducing steam leakage along the slab edge and the intake of external air through the slab edge. This allows steam to stably penetrate the slab along its thickness under negative pressure suction. When the two U-shaped sealing parts clamp the sealing bracket, they reduce the shaking, pulling, or relative displacement of the lead wire during steam preheating, negative pressure suction, and transfer, improving the stability and continuity of the output of detection data such as internal temperature and moisture content of the slab. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first axial view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the second axis view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the linear track component and drive component of the present invention; Figure 4 This is a side view of the diagonal bar structure of the present invention; Figure 5 This is a schematic diagram of the sealing frame and inflation assembly of the present invention; Figure 6 This is a schematic diagram of the plug tube of the present invention; Figure 7 This is a schematic diagram of the piston structure of the present invention; Figure 8 This is a schematic diagram of the sealing frame of the present invention; Figure 9 This is a schematic diagram of the structure of the sealing frame not fully clamping the slab blank according to the present invention; Figure 10 This is a schematic diagram of the sealing bracket, lead wire, and sensor structure of the present invention; Figure 11 This is a schematic diagram of the structure of the driving component of the present invention.

[0018] In the diagram: 1. Hot press; 2. First hydraulic cylinder; 3. Lower hot press plate; 4. Second hydraulic cylinder; 5. Upper hot press plate; 6. Third hydraulic cylinder; 7. Mounting base; 8. Steam spray plate; 9. Steam pipe; 10. Negative pressure plate; 11. Negative pressure pipe; 12. Slab; 13. Linear track component; 14. Drive component; 15. Sealing frame; 16. Connecting frame; 17. Sealing bracket; 18. Plug; 19. Piston; 20. Diagonal rod; 21. Pin; 22. Push rod; 23. Limiting block; 24. 25. Fixed plate; 26. Support rod; 27. First baffle; 28. Second baffle; 29. ​​Limiting plate; 30. First spring; 31. Guide rod; 32. Guide sleeve; 33. Second spring; 34. U-shaped plate; 35. U-shaped sealing gasket; 36. Trapezoidal block; 37. Inclined surface; 38. Lead wire; 39. Sensor; 40. Straight rod; 41. Slide carriage; 42. Handle; 43. First scale piece; 44. Second scale piece; 45. Cable drag chain; 46. Chain support plate; 47. Protective cover; 48. Flexible component. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-11 The present invention provides a technical solution: A steam preheating and hot pressing integrated device for wood-based panels includes a hot press 1, a preheating component, a sealing bracket 17, a sealing frame 15, and a conveying component; these components are described in detail below.

[0021] The hot press 1 includes a lower hot press plate 3 and an upper hot press plate 5 that are arranged opposite to each other and can be raised and lowered independently. In this technical solution, the lower hot press plate 3 can be raised and lowered independently by a first hydraulic cylinder 2, and the upper hot press plate 5 can be raised and lowered independently by a second hydraulic cylinder 4, thereby facilitating the adjustment of the distance between the lower hot press plate 3 and the upper hot press plate 5 according to the actual situation.

[0022] The lower hot platen 3 and the upper hot platen 5 can be heated by electric heating or oil heating, with a temperature range of room temperature to 250℃ and a temperature control accuracy of ±1℃.

[0023] The maximum pressure of the first hydraulic cylinder 2 and the second hydraulic cylinder 4 is 10-50 tons, the unit pressure is adjustable from 0-10MPa, and the pressure holding time accuracy is 0.1s.

[0024] In this embodiment, a hot pressing station for placing the slab 12 is formed between the lower hot pressing plate 3 and the upper hot pressing plate 5. In the actual operation, after the slab 12 is preheated, it needs to be transferred to the hot pressing station. Then, the first hydraulic cylinder 2 and the second hydraulic cylinder 4 are started to gradually reduce the distance between the lower hot pressing plate 3 and the upper hot pressing plate 5, and finally realize the hot pressing operation of the slab 12.

[0025] In this technical solution, the preheating component includes a steam spray plate 8 and a negative pressure plate 10; the steam spray plate 8 and the negative pressure plate 10 can be raised and lowered independently. In this embodiment, the steam spray plate 8 is located above the negative pressure plate 10, and the steam spray plate 8 is raised and lowered by a third hydraulic cylinder 6. The third hydraulic cylinder 6 is fixedly mounted on the hot press 1 by a mounting base 7. The specific fixing method between the mounting base 7 and the hot press 1 can be achieved by bolts or other means, which is not limited here. The negative pressure plate 10 can be fixedly connected to the lower hot press plate 3 by bolts or other means, so that the lower hot press plate 3 can raise and lower the negative pressure plate 10 together; and in this embodiment, the upper surface of the lower hot press plate 3 is flush with the upper surface of the negative pressure plate 10.

[0026] The steam spray plate 8 and the negative pressure plate 10 are arranged opposite to each other, and a preheating station for placing the slab 12 is formed between them. The preheating station is located on the transverse side of the hot pressing station. In actual use, the preheating station is used to preheat the slab 12 with steam or superheated steam.

[0027] The steam spray plate 8 is connected to the steam generator via the steam pipe 9, and the negative pressure plate 10 is connected to the negative pressure equipment via the negative pressure pipe 11, so that steam penetrates the slab 12 along its thickness direction under the negative pressure suction. The steam spray plate 8 is made of temperature- and pressure-resistant stainless steel; the size of the steam spray plate 8 matches the commonly used slab specifications in the laboratory (minimum 100mm×100mm, maximum 500mm×500mm). The steam injection modes include: continuous injection mode, pulse injection mode (pulse width adjustable from 0.2 to 5s, duty cycle adjustable from 10% to 90%), and segmented injection mode. The suction rate of the negative pressure equipment is adjustable from 0 to 50L / min, and the vacuum degree is continuously adjustable from 0 to (-0.08)MPa.

[0028] The combination of the steam spray plate 8 and the negative pressure plate 10 can be used to guide steam to quickly penetrate the slab 12, so as to achieve the technical purpose of rapid preheating.

[0029] The sealing bracket 17 is correspondingly disposed in the middle of one side edge of the slab 12 along the transverse direction. The sensor 38, which is embedded inside the slab 12, is led out from the middle of one side edge of the slab 12 along the transverse direction through the lead wire 37, and is electrically connected to the controller after being sealed through the sealing bracket 17. Specifically, the sensor 38 generally includes a temperature sensor and a humidity / moisture sensor, which are used to monitor the temperature and moisture content inside the slab 12, respectively. Further, the temperature sensor can be a miniature K-type thermocouple or a fiber optic temperature sensor with a diameter of 0.5 mm; the humidity / moisture sensor can be a dielectric or resistive moisture sensor.

[0030] Temperature sensors can be embedded at different depths in the slab (e.g., surface, 1 / 4 thickness, 1 / 2 thickness, etc.) to monitor temperature changes across the slab cross-section in real time during preheating and hot pressing. Humidity / moisture sensors are used to monitor moisture content changes in the surface and core layers of the slab in real time.

[0031] In addition, this technical solution may also include: a pressure sensor, installed in the hydraulic system and steam pipeline, to monitor the test pressure and steam pressure in real time; and a flow meter, used to measure the instantaneous and cumulative steam flow.

[0032] This technical solution can use a data acquisition card to collect data with a sampling frequency of ≥10Hz. It can simultaneously acquire no less than 16 channels of signals. With the help of dedicated experimental software, it can display the temperature field and moisture content change curves in real time and automatically generate data reports after the experiment.

[0033] The entire device can be controlled by a PLC / embedded controller, which can automatically execute a sequence of actions such as steam injection, vacuum negative pressure, thermal pressure closure, pressure holding, and pressure release according to the preset experimental plan, realizing one-button automated experiment.

[0034] In this technical solution, the sealing frame 15 includes two U-shaped sealing parts with opposite openings. Under the action of an elastic element, the two U-shaped sealing parts move laterally closer to each other. While clamping the sealing bracket 17 to limit the position of the lead wire 37 relative to the slab 12, they cooperate with the sealing bracket 17 to form a frame-shaped sealing structure surrounding the periphery of the slab 12, thereby constraining and sealing the periphery of the slab 12. Specifically, the cooperation between the sealing frame 15 and the sealing bracket 17 mainly functions to seal the periphery of the slab 12, preventing steam entering the slab 12 during preheating from escaping from the periphery of the slab 12. That is, in conjunction with the steam spray plate 8 and the negative pressure plate 10, it limits the penetration path of steam inside the slab 12.

[0035] The conveying assembly is used to transport the sealing frame 15 and the slab 12 constrained therein from the preheating station to the hot pressing station.

[0036] Furthermore, in this embodiment, the height of the upper end face of the U-shaped sealing part is not higher than the height of the upper plate surface of the slab 12, and the height of the lower end face of the U-shaped sealing part is not lower than the height of the lower plate surface of the slab 12. This can prevent the U-shaped sealing part from blocking the position of the steam spray plate 8 and the negative pressure plate 10 during the preheating process, and ensure that the steam spray plate 8 and the negative pressure plate 10 can press the slab 12 tightly.

[0037] The steam spray plate 8 and the negative pressure plate 10 are respectively provided with a first micropore area and a second micropore area on their two close-to-each plate surfaces. When the steam spray plate 8 and the negative pressure plate 10 press the blank 12, the upper and lower plate surfaces of the blank 12 are respectively covered by the first micropore area and the second micropore area, so that steam enters the blank 12 through the first micropore area and is discharged through the second micropore area under the suction of the negative pressure equipment.

[0038] Compared with existing technologies, this technical solution integrates the preheating component and the hot press 1, and uses a conveying component to transfer the slab 12 between the preheating station and the hot pressing station. This allows the slab 12 to directly enter the hot pressing station for hot pressing after steam preheating, thereby shortening the transfer path of the slab 12 between preheating and hot pressing, and improving the continuity and connection efficiency of the steam preheating and hot pressing process under laboratory conditions. The steam spray plate 8 and the negative pressure plate 10 in the preheating component are arranged opposite each other. The steam spray plate 8 supplies steam to the upper surface of the slab 12, and the negative pressure plate 10 creates a negative pressure suction effect on the lower surface of the slab 12. This creates a steam flow driving force in the thickness direction of the slab 12, allowing steam to penetrate the slab 12 from the upper surface to the lower surface, improving the core layer heating rate and preheating uniformity of the slab 12. The sealing frame 15, together with the sealing bracket 17, is used to seal the periphery of the slab 12. The sealing frame 15, the steam spray plate 8, and the negative pressure plate 10 form a cooperative relationship. That is, the steam spray plate 8 provides steam, the negative pressure plate 10 provides suction pressure difference, and the sealing frame 15 and the sealing bracket 17 restrict the airflow bypass at the periphery of the slab 12, thereby reducing the leakage of steam along the edge of the slab 12 and the intake of external air through the edge of the slab 12, so that the steam can stably penetrate the slab 12 along the thickness direction under the action of negative pressure suction. Furthermore, the sealing frame 15 includes two U-shaped sealing portions with opposite openings. These two U-shaped sealing portions can clamp the sealing bracket 17 under the action of an elastic element. The sealing bracket 17 is used for the lead wire 37 embedded inside the slab 12 to pass through. Therefore, when the two U-shaped sealing portions clamp the sealing bracket 17, on the one hand, it can limit the position of the lead wire 37 relative to the slab 12, reducing the shaking, pulling, or relative displacement of the lead wire 37 during steam preheating, negative pressure suction, and transfer of the slab 12, thus improving the stability and continuity of the output of detection data such as internal temperature and moisture content of the slab 12; on the other hand, the sealing bracket 17, as part of the frame-shaped sealing structure, participates in the periphery sealing of the slab 12, preventing the lead wire 37's exit position from disrupting the sealing continuity, thereby balancing the stability of sensor data acquisition and the stability of steam directional penetration. Thus, this technical solution can achieve integrated operation of steam preheating, directional penetration, process data acquisition, slab transfer, and hot pressing under laboratory conditions, providing a stable and reliable experimental platform for optimizing preheating and hot pressing process parameters and studying the mechanisms of different environmentally friendly adhesive systems.

[0039] In this technical solution, to prevent the presence of the sealing frame 15 from affecting the hot pressing process, two diagonal rods 20 are provided on both longitudinal sides of the upper hot press plate 5, and limit blocks 23 are fixed on both longitudinal sides of the upper hot press plate 5, so that the diagonal rods 20 can maintain a predetermined tilt angle in the free state; from Figure 4As can be seen, the two diagonal rods 20 on the same side are arranged in an inverted V shape. One end of the diagonal rod 20 is rotatably connected to the upper hot press plate 5 through a pin 21, and the other end of the diagonal rod 20 is fixed with a push rod 22. In actual operation, when the upper hot press plate 5 moves toward the lower hot press plate 3, the push rod 22 can push the two U-shaped sealing parts to gradually move away from each other in the transverse direction against the elastic force of the elastic element, so that the U-shaped sealing parts are completely separated from the blank 12, thereby releasing the seal of the sealing frame 15 on the periphery of the blank 12.

[0040] It is understood that the push rod 22 and the inclined rod 20 in this embodiment will not affect the transfer of the slab 12 from the preheating station to the hot pressing station.

[0041] In this technical solution, by setting up the inclined rod 20 and the push rod 22, the two U-shaped sealing parts are pushed laterally away from each other before the hot pressing operation. This allows the sealing frame 15 to promptly release the seal on the periphery of the slab 12 after the slab 12 has completed steam preheating and entered the hot pressing station. This prevents the U-shaped sealing parts from remaining on the periphery of the slab 12 and occupying the pressing space of the hot pressing plate. It ensures that the upper hot pressing plate 5 and the lower hot pressing plate 3 can directly act on the surface of the slab 12 and effectively hot press the slab 12. This structure allows the sealing frame 15 to maintain the seal on the periphery of the slab 12 during the preheating stage to ensure directional steam penetration; and during the hot pressing stage, it can release the seal on the periphery of the slab 12, avoiding interference with the hot pressing operation while ensuring that water vapor inside the slab 12 can be smoothly discharged through the periphery of the slab 12 during the hot pressing process. This is beneficial for ensuring the uniformity of pressure on the slab 12 and the quality of hot pressing.

[0042] In this technical solution, the U-shaped sealing part includes a U-shaped plate 33 and a U-shaped sealing gasket 34. The U-shaped sealing gasket 34 is made of high-temperature resistant materials, such as perfluoroether rubber, fluororubber, etc. The U-shaped sealing gasket 34 is fixedly installed on the inner surface of the U-shaped plate 33 by means of adhesive or other methods.

[0043] In this embodiment, the U-shaped sealing gasket 34 is inflatable, and each U-shaped plate 33 has an inflation component at one lateral end. The inflation component is used to inflate or depress the gas inside the U-shaped sealing gasket 34. Under normal conditions, the inflation component maintains the gas inside the U-shaped sealing gasket 34 at a predetermined pressure, ensuring that the U-shaped sealing gasket 34 is inflated.

[0044] When it is necessary to extract the gas inside the U-shaped sealing gasket 34, the solution provided in this embodiment is as follows: When the upper hot press plate 5 moves toward the lower hot press plate 3, the push rod 22 first pushes the inflation component to absorb the air inside the U-shaped sealing gasket 34, thereby causing the U-shaped sealing gasket 34 to shrink and separate from the periphery of the blank 12. The push rod 22 then pushes the two U-shaped sealing parts to gradually move away from each other in the lateral direction.

[0045] In this technical solution, the U-shaped sealing gasket 34 is configured as an inflatable type, and each U-shaped sealing gasket 34 is equipped with an inflation component. Under normal conditions, the inflation component keeps the gas inside the U-shaped sealing gasket 34 at a predetermined pressure, ensuring that the U-shaped sealing gasket 34 is in an inflatable state. When the upper hot press plate 5 moves toward the lower hot press plate 3, the push rod 22 first pushes the inflation component to absorb the air inside the U-shaped sealing gasket 34, thereby causing the U-shaped sealing gasket 34 to contract and separate from the periphery of the blank 12. The push rod 22 then pushes the two U-shaped sealing parts to gradually move away from each other laterally. The cooperation between these structures can avoid excessive friction between the U-shaped sealing parts and the blank 12 during the process of separating the U-shaped sealing parts from the blank 12, so that the separation process of the U-shaped sealing parts from the blank 12 will not cause displacement of the blank 12.

[0046] In this embodiment, as Figure 5 and Figure 7 As shown, the inflation assembly includes a plug cylinder 18, a piston 19, a fixing plate 24, and a support rod 25; the plug cylinder 18 may be made of stainless steel.

[0047] One end of the plug cylinder 18 is fixedly connected to the transverse end of the U-shaped plate 33, and one end of the plug cylinder 18 is connected to the U-shaped sealing gasket 34; the piston 19 is slidably disposed inside the plug cylinder 18, and the periphery of the piston 19 is sealed to the inner wall surface of the plug cylinder 18; the piston 19 can change the air pressure inside the U-shaped sealing gasket 34 by sliding.

[0048] from Figure 6 As can be seen, the fixing plate 24 is fixedly connected to the other end of the plug cylinder 18; the function of the fixing plate 24 is to limit the sliding stroke of the piston 19 and prevent the piston 19 from slipping out of the inside of the plug cylinder 18.

[0049] One end of the support rod 25 is fixedly connected to the piston 19. Specifically, the piston 19 includes an outer rubber layer and an inner skeleton layer. The material of the support rod 25 can be the same as that of the skeleton layer. The support rod 25 and the skeleton layer can be fixedly connected by welding or other methods.

[0050] The other end of the support rod 25 slides through the fixing plate 24; specifically, the fixing plate 24 has a sliding hole adapted to the support rod 25, and the other end of the support rod 25 slides through the sliding hole. The fixing plate 24, in conjunction with the sliding hole, allows the support rod 25 to move only along its own axial direction.

[0051] A first spring 29 is sleeved on the support rod 25. The two ends of the first spring 29 are respectively pressed against the piston 19 and the fixed plate 24. The function of the first spring 29 is to squeeze the piston 19, so that the air inside the plug cylinder 18 is squeezed into the U-shaped sealing gasket 34 under the elastic force of the first spring 29 according to the predetermined pressure, so that the air pressure inside the U-shaped sealing gasket 34 is kept at the predetermined vertical position, ensuring the sealing effect between the U-shaped sealing gasket 34 and the periphery of the blank 12.

[0052] A limiting plate 28 is fixed on the piston 19, and the limiting plate 28 corresponds to the fixed plate 24 in position, which is used to limit the maximum sliding stroke of the piston 19. Specifically, the main function of the limiting plate 28 is to prevent the first spring 29 from being over-compressed. In actual use, the maximum stroke of the piston 19 towards the fixed plate 24 is the state in which the limiting plate 28 abuts against the corresponding fixed plate 24.

[0053] The other end of the support rod 25 is fixedly connected to a vertically arranged first baffle 26, and a horizontally arranged second baffle 27 is fixedly connected to the side of the first baffle 26 near the plug cylinder 18. The first baffle 26 and the second baffle 27 can both be made of the same material as the support rod 25, such as hard plastic or stainless steel.

[0054] The height of the upper surface of the second baffle 27 does not exceed the height of the upper surface of the plug cylinder 18. During the entire process of the push rod 22 pushing the two U-shaped sealing parts to gradually move away from each other laterally, the push rod 22 will first rest against the upper surface of the second baffle 27. Then, as the upper hot pressure plate 5 continues to move downward, the push rod 22 will finally abut against the first baffle 26, and then continue to push the first baffle 26 and the piston 19 fixedly connected to the first baffle 26 to gradually move, thereby drawing the air inside the U-shaped sealing gasket 34 back into the plug cylinder 18, realizing the contraction of the U-shaped sealing gasket 34, and separating the U-shaped sealing gasket 34 from the periphery of the blank 12. When the limiting plate 28 contacts the fixing plate 24, the downward movement of the upper hot pressure plate 5 will push the two U-shaped sealing parts to gradually move away from each other laterally until the U-shaped sealing parts are completely separated from the blank 12.

[0055] In this technical solution, the conveying assembly includes a linear track component 13 and a drive component 14; the linear track component 13 and the drive component 14 will be described in detail below.

[0056] Two linear track components 13 are provided, located on the longitudinal sides of the lower hot press plate 3 respectively. The linear track component 13 includes a protective cover 46, a guide rod 30 and a guide sleeve 31. The protective cover 46 is fixedly connected to the hot press 1 by bolts or other means. The guide rod 30 is fixedly connected inside the protective cover 46 and extends laterally.

[0057] The U-shaped sealing part is slidably connected to the guide rod 30 via the guide sleeve 31; specifically, the U-shaped plate 33 of the U-shaped sealing part is fixedly connected to the guide sleeve 31, and the fixed connection between the two can be bolted or welded.

[0058] In this embodiment, the elastic element is a second spring 32. The two ends of the second spring 32 are fixedly connected to two guide sleeves 31 located on the same side of the sealing frame 15, and the second spring 32 is sleeved on the guide rod 30.

[0059] The drive component 14 can be electrically driven, such as a ball screw combined with a servo motor. In this embodiment, for example... Figure 1 and Figure 11 As shown, the drive component 14 includes a straight rod 39 and a carriage 40; wherein the carriage 40 is arranged longitudinally and is fixedly installed on the protective cover 46 by bolts or other means.

[0060] The straight rod 39 is arranged laterally and slides through the carriage 40, that is, the straight rod 39 can slide on the carriage 40 along its own axis.

[0061] One end of the straight rod 39 is fixedly connected to the U-shaped sealing part. Specifically, one end of the straight rod 39 is fixedly connected to the fixing plate 24, and the other end of the straight rod 39 is fixed with a handle 41. The handle 41 makes it convenient for the operator to push and pull the straight rod 39, thereby adjusting the position of the sealing frame 15 and the blank 12 constrained inside it.

[0062] The straight rod 39 is equipped with a first scale element 42 and a second scale element 43. The function of the first scale element 42 and the second scale element 43 is to facilitate the identification of the position of the sealing frame 15. Specifically: when the first scale element 42 moves to the slide 40, the sealing frame 15 is located in the preheating position; when the second scale element 43 moves to the slide 40, the sealing frame 15 is located in the hot pressing position. The first scale element 42 and the second scale element 43 can be coated with a different color than the straight rod 39. For example, the first scale element 42 and the second scale element 43 can be coated with yellow and red coatings, respectively, so as to facilitate quick identification of the position information of the sealing frame 15.

[0063] In this technical solution, the sealing bracket 17 includes a connecting frame 16, a trapezoidal block 35, and a flexible component 47; the material of the flexible component 47 can be consistent with the material of the U-shaped sealing gasket 34, and the materials of the connecting frame 16 and the trapezoidal block 35 can be consistent with the material of the U-shaped plate 33.

[0064] The flexible component 47 is fixedly connected to the connecting frame 16 via the trapezoidal block 35, and the end of the lead wire 37 away from the sensor 38 is led out from one end of the connecting frame 16. In this embodiment, a drag chain 44 and a chain support plate 45 are also provided inside the protective cover 46. The chain support plate 45 is used to support the drag chain 44, and the drag chain 44 is used to arrange the lead wire 37 to ensure that the lead wire 37 can smoothly transmit the signal to the controller.

[0065] When the sealing frame 15 seals the periphery of the blank 12, the flexible element 47 is clamped in the middle by two U-shaped sealing gaskets 34, and the trapezoidal block 35 is clamped in the middle by two U-shaped plates 33. The end of the U-shaped plate 33 near the trapezoidal block 35 is matched with the inclined surface 36 of the trapezoidal block 35. The presence of the inclined surface 36 means that when the two U-shaped plates 33 clamp the trapezoidal block 35, the clamping force of the two U-shaped plates 33 on the inclined surface 36 of the trapezoidal block 35 will push the trapezoidal block 35 to squeeze the flexible element 47, thus ensuring the sealing effect between the flexible element 47 and the periphery of the blank 12.

[0066] A method of using an integrated steam preheating and hot pressing device for wood-based panels, the method comprising the following steps: S1. Constrain the slab 12 between the two U-shaped sealing parts, and move the slab 12 and the U-shaped sealing parts to the preheating station; S2. Use the steam spray plate 8 and the negative pressure plate 10 to press the slab 12 tightly, and start the steam generator and negative pressure equipment to start preheating the slab 12, while recording the data detected by the sensor 38. S3. After preheating is completed, turn off the steam generator and negative pressure equipment, and transport the sealing frame 15 and the slab 12 constrained inside it from the preheating station to the hot pressing station through the conveying assembly. S4. The blank 12 is hot-pressed and cured using the lower hot press plate 3 and the upper hot press plate 5, while the data detected by the sensor 38 is recorded.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steam preheating and hot pressing integrated device for wood-based panels, characterized in that, Includes a hot press, preheating assembly, sealing bracket, sealing frame, and conveying assembly; The hot press includes a lower hot press plate and an upper hot press plate that are arranged opposite to each other and can be raised and lowered independently. A hot press station for placing slabs is formed between the lower hot press plate and the upper hot press plate. The preheating assembly includes a steam spray plate and a negative pressure plate; the steam spray plate and the negative pressure plate can be raised and lowered independently; the steam spray plate and the negative pressure plate are arranged opposite each other, and a preheating station for placing the slab is formed between them; the steam spray plate is connected to a steam generator, and the negative pressure plate is connected to a negative pressure device, so that steam penetrates the slab along the thickness direction of the slab located in the preheating station under the action of negative pressure suction. The preheating station is located on one side of the hot pressing station; The sealing bracket is positioned at the center of one side edge of the slab along the transverse direction. The sensor embedded inside the slab is led out from the center of one side edge of the slab along the transverse direction via a lead wire, and is sealed through the sealing bracket before being electrically connected to the controller. The sealing frame includes two U-shaped sealing parts with opposite openings. The two U-shaped sealing parts approach each other laterally under the action of the elastic element. While clamping the sealing bracket to limit the position of the lead wire relative to the slab, they cooperate with the sealing bracket to form a frame-shaped sealing structure around the periphery of the slab, so as to constrain and seal the periphery of the slab. The conveying assembly is used to transport the sealing frame and the slab constrained therein from the preheating station to the hot pressing station.

2. The integrated steam preheating and hot pressing device for wood-based panels according to claim 1, characterized in that, Two diagonal bars are provided on both longitudinal sides of the upper hot press plate. One end of the diagonal bar is rotatably connected to the upper hot press plate through a pin, and the other end of the diagonal bar is fixed with a push rod. Limiting blocks are fixed on both sides of the upper hot press plate to keep the diagonal bar at a predetermined tilt angle when it is in a free state. As the upper hot press plate moves toward the lower hot press plate, the push rod can push the two U-shaped sealing parts to gradually move away from each other laterally, so as to release the seal of the sealing frame on the periphery of the slab.

3. The integrated steam preheating and hot pressing device for wood-based panels according to claim 2, characterized in that, The U-shaped sealing part includes a U-shaped plate and a U-shaped sealing gasket, with the U-shaped sealing gasket fixedly installed on the inner surface of the U-shaped plate; The U-shaped sealing gasket is inflatable, and each U-shaped plate has an inflatable component at one of its horizontal ends. As the upper hot press plate moves toward the lower hot press plate, the push rod first pushes the inflation assembly to absorb the air inside the U-shaped sealing gasket, causing the U-shaped sealing gasket to shrink and separate from the periphery of the blank. The push rod then pushes the two U-shaped sealing parts to gradually move away from each other laterally.

4. The integrated steam preheating and hot pressing device for wood-based panels according to claim 3, characterized in that, The inflation assembly includes a plug, piston, fixed plate, and support rod; One end of the plug is fixedly connected to the transverse end of the U-shaped plate, and the other end of the plug is connected to the U-shaped sealing gasket. The piston is slidably disposed inside the plug cylinder, and the periphery of the piston is sealed to the inner wall of the plug cylinder; The fixing plate is fixedly connected to the other end of the plug cylinder; One end of the support rod is fixedly connected to the piston, and the other end slides through the fixed plate; A first spring is sleeved on the support rod, and the two ends of the first spring abut against the piston and the fixed plate, respectively; A limit plate is fixed on the piston, and the position of the limit plate corresponds to that of the fixed plate, which is used to limit the maximum sliding stroke of the piston.

5. The integrated steam preheating and hot pressing device for wood-based panels according to claim 4, characterized in that, The other end of the support rod is fixedly connected to a vertically arranged first baffle. A horizontally arranged second baffle is fixedly connected to the side of the first baffle near the stopper cylinder. The height of the upper surface of the second baffle does not exceed the height of the upper surface of the stopper cylinder.

6. The integrated steam preheating and hot pressing device for wood-based panels according to claim 1, characterized in that, The conveying assembly includes a linear track component and a drive component; The linear track component includes a protective cover, a guide rod, and a guide sleeve. The protective cover is fixedly connected to the hot press, and the guide rod is fixedly connected inside the protective cover and extends laterally. The U-shaped sealing part is slidably connected to the guide rod through the guide sleeve; The elastic element is a second spring, and the two ends of the second spring are fixedly connected to two guide sleeves respectively.

7. The integrated steam preheating and hot pressing device for wood-based panels according to claim 6, characterized in that, The drive components include a straight rod and a carriage; The carriage is arranged longitudinally and fixedly mounted on the protective cover; A straight rod is set horizontally and slides through the carriage. One end of the straight rod is fixedly connected to the U-shaped sealing part, and the other end of the straight rod is fixed with a handle. The straight rod is equipped with a first scale component and a second scale component; When the first graduated piece moves to the carriage, the sealing frame is in the preheating position; when the second graduated piece moves to the carriage, the sealing frame is in the hot pressing position.

8. The integrated steam preheating and hot pressing device for wood-based panels according to claim 3, characterized in that, The sealing support includes a connecting frame, a trapezoidal block, and a flexible component; The flexible component is fixedly connected to the connecting frame via a trapezoidal block, and the end of the lead wire furthest from the sensor is led out from one end of the connecting frame. When the sealing frame seals the periphery of the slab blank, the flexible part is clamped in the middle by two U-shaped sealing pads, and the trapezoidal block is clamped in the middle by two U-shaped plates; The end of the U-shaped plate closest to the trapezoidal block is set to match the inclined surface of the trapezoidal block.

9. The integrated steam preheating and hot pressing device for wood-based panels according to claim 1, characterized in that, The steam spray plate and the negative pressure plate are respectively provided with a first micropore area and a second micropore area on their two close-to-each plate surfaces. When the steam spray plate and the negative pressure plate press the slab, the upper and lower plates of the slab cover the first micropore area and the second micropore area respectively, so that steam enters the slab through the first micropore area and is discharged through the second micropore area under the suction of the negative pressure equipment.

10. A method of using an integrated steam preheating and hot pressing device for wood-based panels, characterized in that, The method of use is based on the integrated steam preheating and hot pressing device for wood-based panels as described in any one of claims 1-9, and includes the following steps: S1. Constrain the slab between the two U-shaped sealing parts, and move the slab and the U-shaped sealing parts to the preheating station; S2. Use steam spray plates and negative pressure plates to press the slab tightly, and start the steam generator and negative pressure equipment to begin preheating the slab, while recording the data detected by the sensors. S3. After preheating is completed, turn off the steam generator and negative pressure equipment, and transport the sealing frame and the slab constrained inside it from the preheating station to the hot pressing station through the conveying assembly. S4. Use the lower and upper hot press plates to perform hot pressing and curing treatment on the slab, and record the data detected by the sensor at the same time.

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