Method and device for modifying black peach color of liquidambar formosana by soaking

Abstract

The invention discloses a method and device for modifying the black peach color of liquidambar formosana by soaking, and relates to the technical field of wood modification, the method comprises the following steps: wood pretreatment, preparation of a black peach color modification liquid, segmented pressurized soaking and post-treatment.The segmented pressurized soaking comprises the following steps: placing pretreated liquidambar formosana in the modification liquid, soaking for 3-5 h at the temperature of 40-50 DEG C under normal pressure, and then soaking for 3-5 h at the temperature of 40-50 DEG C; the pressure is increased to 0.3-0.6 MPa, the temperature is increased to 60-75 DEG C, soaking is conducted for 8-16 h, stirring is kept in the soaking process, the natural black walnut wood extract is extract obtained by conducting ethanol ultrasonic extraction and vacuum concentration on black walnut heartwood, the penetrating agent is iso-tridecanol polyoxyethylene ether, the color fixing agent is a polyamine compound, and the curing agent is a polyamine compound. The problems that a single dye and a normal pressure soaking mode are mostly adopted in a traditional soaking method, the black walnut wood color is deep, the dyeing efficiency is low, the color fixing effect is poor, wood performance improvement is limited, key parameters such as temperature and pressure in the soaking process cannot be accurately controlled, and the stability of the modification effect is affected are solved.

Description

Technical Field

[0001] This invention relates to the field of wood modification technology, specifically to a method and apparatus for modifying the color of black walnut from maple wood by soaking. Background Technology

[0002] Sweetgum is a common broad-leaved tree species widely used in furniture manufacturing and interior decoration. However, the natural color of sweetgum is relatively light and uniform, mostly pale yellow or light brown, which is difficult to meet the market's demand for high-end wood colors. Black walnut, due to its calm and dignified visual effect, is highly favored in the field of high-end furniture and decoration. However, black walnut resources are scarce and expensive, which limits its large-scale application. Therefore, processing methods for modifying sweetgum to resemble black walnut have emerged, such as soaking treatment.

[0003] However, traditional soaking methods often use a single dye and atmospheric pressure soaking, which results in low dyeing efficiency, poor color fixation, and limited improvement in wood properties due to the dark color of black walnut wood. It is also impossible to accurately control key parameters such as temperature and pressure during the soaking process, thus affecting the stability of the modification effect. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for modifying the color of black walnut wood by soaking, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for modifying the color of black walnut wood by soaking, comprising the following steps:

[0006] Wood pretreatment: Select defect-free maple wood boards, dry them to a moisture content of 12-18%, polish the surface, and then soak them in a degreasing agent for 1-3 hours to remove grease, thus obtaining pretreated maple wood;

[0007] Preparation of black walnut color modification solution: Mix 8-15 parts of natural black walnut wood extract, 4-9 parts of environmentally friendly vat dye, 3-6 parts of penetrant, 2-5 parts of fixing agent, 1-3 parts of antioxidant and 60-80 parts of deionized water, stir and dissolve at 50-70℃ for 30-50 min, filter through a 1-5μm filter membrane to obtain the modification solution;

[0008] Segmented pressure soaking: Place the pretreated maple wood in the modified solution, first soak it at normal pressure and 40-50℃ for 3-5 hours, then pressurize it to 0.3-0.6MPa and heat it to 60-75℃ for 8-16 hours, keeping it stirred during the soaking process;

[0009] Post-treatment: Remove the soaked maple wood, wash off the residual liquid on the surface with deionized water, dry it at 45-60℃ and 35-55% relative humidity until the moisture content is 9-13%, and finally undergo surface curing treatment to obtain black walnut-colored modified maple wood.

[0010] Preferably, the degreasing agent is a propylene glycol solution with a mass fraction of 50-65%, the soaking temperature is 30-40℃, and the drying treatment adopts a stepped heating method, gradually increasing from 30℃ to 55℃.

[0011] Preferably, the natural black walnut wood extract is an extract obtained by ultrasonic extraction of black walnut heartwood with ethanol and concentration under reduced pressure, the penetrant is isotridecyl alcohol polyoxyethylene ether, the color-fixing agent is a polyamine compound, and the antioxidant is di-tert-butyl-p-cresol.

[0012] Preferably, the surface curing treatment is performed by heat curing at a temperature of 70-85℃ for 2-4 hours, and the curing agent is a water-based polyurethane emulsion, with an amount of 0.5-1.2% of the wood surface mass.

[0013] An apparatus for modifying the color of black walnut wood by soaking includes a soaking chamber, and further includes...

[0014] A support frame is provided, with support shafts fixedly connected to both sides. The inner wall of the soaking chamber has a groove, and the support shafts are rotatably connected to the inner wall of the groove. A baffle is fixedly connected to the top of the support frame by screws. Arc-shaped plates are fixedly connected to both sides of the support frame and the baffle. Scrapers are fixedly connected to both sides of the arc-shaped plates. Protrusions are fixedly connected to the inner walls of the support frame and the baffle for clamping and fixing the wooden board and for driving the wooden board to rotate and slide slightly.

[0015] A sealing cap has a through groove at its top, and a drive wheel is rotatably connected to the inner wall of the through groove. The bottom of the drive wheel is rotatably connected to the top of the arc-shaped plate. The top of the sealing cap is provided with an immersion liquid filtration and circulation drive assembly and a sealing mechanism, which are used to drive the drive wheel to rotate and drive the support frame and the wooden board to rotate.

[0016] Preferably, the soaking solution filtration and circulation drive assembly includes a liquid pump, a connecting pipe one, and a connecting shaft. The liquid pump has a built-in filter. Connecting pipe two and connecting pipe three are fixedly connected to both sides of the liquid pump, respectively. A hollow shaft is fixedly connected through the middle of the drive wheel. Support plates are rotatably connected to both ends of the hollow shaft. Annular grooves are formed on the surface of both ends of the hollow shaft. Sealing rings are fixedly connected to the ends of connecting pipe one and connecting pipe three. The sealing rings rotatably fit against the inner wall of the annular groove of the hollow shaft. The connecting shaft is fixedly connected through the... The shaft is connected to a blade. One end of the connecting shaft is rotatably connected to a fixed plate 1 via a bearing. A connecting rod 1 is fixedly connected to the side of the fixed plate 1. The end of the connecting rod 1 away from the fixed plate 1 is fixedly connected to the inner wall of the connecting pipe 1. The other end of the connecting shaft is fixedly connected to a fixed plate 2. A connecting rod 2 is fixedly connected to the side of the fixed plate 2. The end of the connecting rod 2 away from the fixed plate 2 is fixedly connected to the inner wall of the hollow shaft. The bottom of the liquid pump, the connecting pipe 3, the connecting pipe 1, the connecting pipe 2, and the support plate are all fixedly connected to the top of the sealing cover.

[0017] Preferably, the sealing mechanism includes a sealing chamber, with mounting plates fixedly connected to both sides of the outer wall of the sealing chamber. The top of the sealing cover has a screw hole, and the mounting plate is fixedly connected to the top of the sealing cover by screws and screw holes. A sealing gasket is affixed to the bottom edge of the sealing chamber, and the bottom of the sealing gasket is attached to the side of the support plate and the top of the sealing cover.

[0018] Preferably, both sides of the soaking chamber are fixedly connected to liquid delivery pipes, and the bottom openings of both connecting pipe two and connecting pipe one are fixedly connected to retaining rings. The retaining rings slide and engage with the inner wall of the liquid delivery pipes. A sealing frame is fixedly sleeved on the lower side of the outer wall of the sealing cover. Hand-tightening bolts are threaded through and inserted into both sides of the sealing frame. Positioning holes are provided on both sides of the outer wall of the soaking chamber, and the ends of the hand-tightening bolts are threaded into the inner wall of the positioning holes of the soaking chamber.

[0019] Preferably, the inner wall of the sealing cover integrates a temperature sensor, a pressure sensor, and a liquid level sensor. The top of the sealing cover is fixedly connected to a pressure valve, a liquid filling valve, and a handle. Liquid filling pipes are fixedly connected to both sides of the soaking chamber. A flow channel is opened inside the soaking chamber and is connected to the liquid filling pipe. A base is fixedly connected to the bottom of the soaking chamber, and a base plate is fixedly connected to the bottom of the base.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention features an immersion chamber, a support frame, an arc-shaped plate, and an immersion liquid filtration and circulation drive assembly. When the modified liquid flows through multiple sets of blades, it drives the blades and connecting shaft to rotate. This rotation is then achieved through a second fixed plate, a second connecting rod, and a hollow shaft, which in turn drives the drive wheel to rotate. The drive wheel then drives the arc-shaped plate and the support frame to rotate, thereby causing the maple wood board inside the support frame to rotate. The wood board agitates the modified liquid in the immersion chamber, improving the immersion effect on the wood board.

[0022] This invention, by setting up a support frame and an immersion liquid filtration and circulation drive component, allows the wooden board to agitate the modified liquid while simultaneously sliding slightly inside the support frame, changing the contact position with the protrusions. This ensures that the surface of the wooden board is in full contact with the modified liquid, avoiding dead corners and further improving the dyeing effect.

[0023] This invention features a support frame, an arc-shaped plate, and a scraper. The arc-shaped plate drives the scraper to rotate, scraping away wood impurities adhering to the inner wall of the soaking chamber to prevent sedimentation. The impurities then flow with the modified liquid into the liquid pump, where they are filtered through a built-in filter.

[0024] This invention features a sealed cover with integrated temperature, pressure, and liquid level sensors on the inner wall. External pressurization devices are connected to the pressurization valve and liquid filling valve, respectively, to regulate the pressure within the soaking chamber and replenish the modified liquid when the liquid level drops to a certain level. An external temperature control device is connected to the liquid filling pipe, allowing water of varying temperatures to be supplied to the soaking chamber through the pipe and the internal flow channel, thus altering the temperature. By adjusting the temperature and pressure within the soaking chamber as needed, and coordinating with the agitation of the modified liquid, the modification effect is significantly improved.

[0025] This invention incorporates a sealing mechanism to provide an additional seal at the connection between the drive wheel and the sealing cover, preventing air leakage that could hinder the increase of pressure within the soaking chamber. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of the soaking chamber of the present invention;

[0028] Figure 3 This is a structural disassembly diagram of the support frame of the present invention;

[0029] Figure 4 This is a schematic diagram of the sealing cap structure of the present invention;

[0030] Figure 5 This is a schematic diagram showing the disassembly of the sealed chamber structure of the present invention;

[0031] Figure 6 This is a schematic diagram showing the disassembly of the blade structure of the present invention.

[0032] In the diagram: 1. Immersion chamber; 2. Support frame; 3. Baffle; 4. Protrusion; 5. Support shaft; 6. Arc plate; 7. Scraper; 8. Sealing cover; 9. Drive wheel; 10. Hollow shaft; 11. Support plate; 12. Connecting pipe one; 13. Sealing ring; 14. Fixing plate one; 15. Connecting rod one; 16. Connecting shaft; 17. Paddle; 18. Fixing plate two; 19. Connecting rod two; 20. Connecting pipe two; 21. Liquid pump; 22. Connecting pipe three; 23. Screw hole; 24. Liquid delivery pipe; 25. Sealing chamber; 26. Mounting plate; 27. Pressure valve; 28. Liquid filling valve; 29. ​​Handle; 30. Hand-tightening bolt; 31. Liquid filling pipe; 32. Base; 33. Base plate; 34. Groove; 35. Sealing frame; 36. Snap ring. Detailed Implementation

[0033] 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.

[0034] Please see Figures 1-6 This invention provides a technical solution: a method for modifying the color of black walnut wood by soaking, comprising the following steps:

[0035] Wood pretreatment: Select defect-free maple wood boards, dry them to a moisture content of 12-18%, polish the surface, and then soak them in a degreasing agent for 1-3 hours to remove grease, thus obtaining pretreated maple wood;

[0036] Preparation of black walnut color modification solution: Mix 8-15 parts of natural black walnut wood extract, 4-9 parts of environmentally friendly vat dye, 3-6 parts of penetrant, 2-5 parts of fixing agent, 1-3 parts of antioxidant and 60-80 parts of deionized water, stir and dissolve at 50-70℃ for 30-50 min, filter through a 1-5μm filter membrane to obtain the modification solution;

[0037] Segmented pressure soaking: Place the pretreated maple wood in the modified solution, first soak it at normal pressure and 40-50℃ for 3-5 hours, then pressurize it to 0.3-0.6MPa and heat it to 60-75℃ for 8-16 hours, keeping it stirred during the soaking process;

[0038] Post-treatment: Remove the soaked maple wood, wash off the residual liquid on the surface with deionized water, dry it at 45-60℃ and 35-55% relative humidity until the moisture content is 9-13%, and finally undergo surface curing treatment to obtain black walnut-colored modified maple wood.

[0039] Furthermore, the degreasing agent is a propylene glycol solution with a mass fraction of 50-65%, the soaking temperature is 30-40℃, and the drying process adopts a step-by-step heating method, gradually increasing from 30℃ to 55℃ to improve the drying effect.

[0040] Furthermore, the natural black walnut wood extract is an extract obtained by ultrasonic extraction of black walnut heartwood with ethanol and concentration under reduced pressure. The penetrant is isomeric tridecyl alcohol polyoxyethylene ether, the color fixative is a polyamine compound, and the antioxidant is di-tert-butyl-p-cresol.

[0041] Furthermore, the surface curing treatment adopts heat curing, with a curing temperature of 70-85℃ and a time of 2-4 hours. The curing agent is water-based polyurethane emulsion, and the amount used is 0.5-1.2% of the wood surface mass.

[0042] An apparatus for modifying the color of black walnut wood by soaking includes a soaking chamber 1, and further includes...

[0043] Support frame 2, with support shafts 5 fixedly connected to both sides of support frame 2, grooves 34 are provided on the inner wall of soaking chamber 1, and support shafts 5 are rotatably connected to the inner wall of grooves 34. Baffle 3 is fixedly connected to the top of support frame 2 by screws. Arc plates 6 are fixedly connected to both sides of support frame 2 and baffle 3, and scrapers 7 are fixedly connected to both sides of arc plates 6. Protrusions 4 are fixedly connected to the inner walls of support frame 2 and baffle 3 for clamping and fixing the wooden board and driving the wooden board to rotate and slide slightly.

[0044] The sealing cover 8 has a through groove on its top and a drive wheel 9 rotatably connected to the inner wall of the through groove. The bottom of the drive wheel 9 is rotatably connected to the top of the arc plate 6. The top of the sealing cover 8 is provided with an immersion liquid filtration circulation drive assembly and a sealing mechanism, which are used to drive the drive wheel 9 to rotate and drive the support frame 2 and the wooden board to rotate.

[0045] Furthermore, the soaking solution filtration circulation drive assembly includes a liquid pump 21, a connecting pipe 12, and a connecting shaft 16. The liquid pump 21 has a built-in filter. Connecting pipes 20 and 3 are fixedly connected to both sides of the liquid pump 21, respectively. A hollow shaft 10 is fixedly connected through the middle of the drive wheel 9. Support plates 11 are rotatably connected to both ends of the hollow shaft 10. Annular grooves are formed on both ends of the hollow shaft 10. Sealing rings 13 are fixedly connected to the ends of connecting pipes 12 and 3, respectively. The sealing rings 13 rotatably fit into the inner wall of the annular groove of the hollow shaft 10. A blade 17 is fixedly connected through the connecting shaft 16. One end of the connecting shaft 16 is rotatably connected to a fixing plate 14 via a bearing. A connecting rod 15 is fixedly connected to the side of the fixed plate 14. The end of the connecting rod 15 away from the fixed plate 14 is fixedly connected to the inner wall of the connecting pipe 12. The other end of the connecting shaft 16 is fixedly connected to the fixed plate 18. A connecting rod 19 is fixedly connected to the side of the fixed plate 18. The end of the connecting rod 19 away from the fixed plate 18 is fixedly connected to the inner wall of the hollow shaft 10. The bottom of the liquid pump 21, the connecting pipe 22, the connecting pipe 12, the connecting pipe 20, and the support plate 11 are all fixedly connected to the top of the sealing cover 8. The modified liquid is filtered, and the flow of the modified liquid can also drive the drive wheel 9 to rotate the arc plate 6 and the support frame 2 to agitate the modified liquid in the soaking chamber 1.

[0046] Furthermore, the sealing mechanism includes a sealing chamber 25, with mounting plates 26 fixedly connected to both sides of the outer wall of the sealing chamber 25. The top of the sealing cover 8 has screw holes 23. The mounting plates 26 are fixedly connected to the top of the sealing cover 8 by screws and screw holes 23. Sealing gaskets are attached to the bottom edge of the sealing chamber 25. The bottom of the sealing gaskets is attached to the side of the support plate 11 and the top of the sealing cover 8, providing additional sealing at the connection between the drive wheel 9 and the sealing cover 8 to prevent air leakage that would make it difficult to increase the pressure inside the soaking chamber 1.

[0047] Furthermore, both sides of the soaking chamber 1 are fixedly connected to liquid delivery pipes 24. The bottom openings of connecting pipe 20 and connecting pipe 12 are fixedly connected to retaining rings 36. The retaining rings 36 slide and engage with the inner wall of the liquid delivery pipe 24. A sealing frame 35 is fixedly sleeved on the lower side of the outer wall of the sealing cover 8. Both sides of the sealing frame 35 are threaded with hand-tightening bolts 30. Positioning holes are opened on both sides of the outer wall of the soaking chamber 1. The ends of the hand-tightening bolts 30 are threaded into the inner wall of the positioning holes of the soaking chamber 1. The liquid delivery pipe 24, connecting pipe 20, and connecting pipe 12 are all detachable, making it easy to remove the sealing cover 8 from the soaking chamber 1.

[0048] Furthermore, the inner wall of the sealing cover 8 integrates a temperature sensor, a pressure sensor, and a liquid level sensor. The top of the sealing cover 8 is fixedly connected to a pressure valve 27, a liquid filling valve 28, and a handle 29. Liquid filling pipes 31 are fixedly connected to both sides of the soaking chamber 1. A flow channel is opened inside the soaking chamber 1 and is connected to the liquid filling pipe 31. A base 32 is fixedly connected to the bottom of the soaking chamber 1, and a base plate 33 is fixedly connected to the bottom of the base 32. The pressure, temperature, and liquid level in the soaking chamber 1 are monitored in real time, and timely adjustments are made to make the soaking conditions more accurate.

[0049] Working principle: The maple wood planks are pre-treated using existing technology and equipment. The treated planks are then placed inside the support frame 2. A baffle 3 is installed onto the support frame 2 using screws, enclosing the planks inside. Simultaneously, the upper and lower curved plates 6 are joined together to form a complete ring. The support shaft 5 is then placed into the groove 34. The support frame 2 and the planks are slowly lowered into the soaking chamber 1. A prepared black walnut-colored modified liquid is then poured into the soaking chamber 1. The sealing cap 8 is placed on the soaking chamber 1, and the sealing frame 35 surrounds the joint to improve sealing. The soaking chamber 1 and the sealing cap 8 are then secured using hand-tightened bolts 30. The connection is solidified. At this time, the top of the arc-shaped plate 6 contacts the bottom of the drive wheel 9 through the through groove of the sealing cover 8. The inner wall of the sealing cover 8 integrates a temperature sensor, a pressure sensor, and a liquid level sensor. External pressurizing equipment is connected to the pressurizing valve 27 and the liquid filling valve 28, respectively, to adjust the pressure inside the soaking chamber 1 and to replenish the modified liquid in time when the liquid level in the soaking chamber 1 drops to a certain level. An external temperature control device is connected to the liquid filling pipe 31. Water of different temperatures is delivered into the soaking chamber 1 through the liquid filling pipe 31 and the flow channel inside the soaking chamber 1 to change the temperature inside the soaking chamber 1. Then, the liquid pump 21 is turned on and connected to the connecting pipe. 12. The modified liquid in the soaking chamber 1 is extracted. When the modified liquid flows, it passes through multiple sets of blades 17, driving the blades 17 and connecting shaft 16 to rotate. Then, through the fixed plate 2 18, connecting rod 2 19 and hollow shaft 10, the drive wheel 9 is driven to rotate. The drive wheel 9 then drives the arc plate 6 and support frame 2 to rotate, thereby causing the maple wood board in the support frame 2 to rotate. The wood board agitates the modified liquid in the soaking chamber 1, improving the soaking effect on the wood board. The wood board can also slide slightly, changing the contact position with the protrusions 4, so that the surface of the wood board can fully contact the modified liquid and avoid dead corners, further improving the soaking effect. At the same time, the arc plate 6 It also drives the scraper 7 to rotate, scraping off the wood impurities attached to the inner wall of the soaking chamber 1 to prevent sedimentation. The impurities flow with the modification liquid into the liquid pump 21 and are filtered through the built-in filter of the liquid pump 21. The temperature and pressure inside the soaking chamber 1 are changed as needed, and the modification liquid is stirred to greatly improve the modification effect. This solves the problem that traditional soaking methods often use single dyes and atmospheric pressure soaking, while black walnut wood has a dark color, resulting in low dyeing efficiency, poor color fixation effect, and limited improvement in wood performance. It also makes it impossible to accurately control key parameters such as temperature and pressure during the soaking process, which affects the stability of the modification effect.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] 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 method for modifying the color of black walnut by steeping, characterized by: The method comprises the following steps: Wood pretreatment: select defect-free maple wood board, sequentially dry to 12-18% moisture content, fine sanding, then soak in degreasing agent for 1-3h to remove grease, and obtain pretreated maple wood; Black walnut color modification liquid preparation: mix 8-15 parts of natural black walnut extract, 4-9 parts of environmentally friendly reducing dye, 3-6 parts of penetrant, 2-5 parts of fixing agent, 1-3 parts of antioxidant and 60-80 parts of deionized water, stir and dissolve at 50-70℃ for 30-50min, filter through a 1-5μm filter membrane, and obtain the modification liquid; Segmented pressure soaking: put the pretreated maple wood into the modification liquid, first soak at normal pressure and 40-50℃ for 3-5h, then pressurize to 0.3-0.6MPa and heat to 60-75℃ for 8-16h, and keep stirring during the soaking process; Post-treatment: take out the soaked maple wood, wash the surface residual liquid with deionized water, dry at 45-60℃ and 35-55% relative humidity to 9-13% moisture content, and finally perform surface curing treatment to obtain black walnut color modified maple wood.

2. A method of modifying the color of black walnut by steeping according to claim 1, characterized in that: The degreasing agent is a 50-65% propylene glycol solution, and the soaking temperature is 30-40℃. The drying treatment is performed by stepwise temperature rising from 30℃ to 55℃.

3. The method for modifying the color of black walnut by steeping according to claim 1, characterized in that: The natural black walnut extract is an extract of black walnut heartwood obtained by ultrasonic extraction with ethanol and vacuum concentration. The penetrant is isomeric tridecanol polyoxyethylene ether, the fixing agent is a polyamine compound, and the antioxidant is di-tert-butyl-p-cresol.

4. The method for modifying the color of black walnut by steeping according to claim 1, wherein: The surface curing treatment is performed by thermal curing at 70-85℃ for 2-4h. The curing agent is water-based polyurethane emulsion, and the amount used is 0.5-1.2% of the mass of the wood surface.

5. An apparatus for modifying the color of black walnut by soaking, characterized by: The method comprises the following steps: The method comprises the following steps: The support frame (2) and the baffle (3) are fixedly connected with the arc-shaped plates (6) on both sides, the arc-shaped plates (6) are fixedly connected with the scrapers (7) on both sides, and the inner walls of the support frame (2) and the baffle (3) are fixedly connected with the convex points (4) for clamping and fixing the wood board and driving the wood board to rotate and slightly slide; The top of the sealing cover (8) is provided with a through groove, the inner wall of the through groove is rotatably connected with a driving wheel (9), the bottom of the driving wheel (9) is rotatably connected with the top of the arc-shaped plate (6), and the top of the sealing cover (8) is provided with a soaking liquid filtering and circulating driving assembly and a sealing mechanism for driving the driving wheel (9) to rotate and drive the support frame (2) and the wood board to rotate.

6. A device for modifying the color of black walnut by steeping according to claim 5, wherein: The soaking liquid filtering circulation driving component includes a liquid pump (21), a connecting pipe one (12) and a connecting shaft (16), the liquid pump (21) is provided with a filter, the liquid pump (21) is fixedly connected with a connecting pipe two (20) and a connecting pipe three (22) on both sides respectively, the middle part of the driving wheel (9) is fixedly connected with a hollow shaft (10) penetrating through, both ends of the hollow shaft (10) are rotatably connected with a supporting plate (11), the surface of both ends of the hollow shaft (10) is provided with an annular groove, the end of the connecting pipe one (12) and the connecting pipe three (22) is fixedly connected with a sealing ring (13), the sealing ring (13) is rotatably sleeved in the inner wall of the annular groove of the hollow shaft (10), the connecting shaft (16) is fixedly connected with a paddle (17) penetrating through, one end of the connecting shaft (16) is rotatably connected with a fixed plate one (14) through a bearing, the side edge of the fixed plate one (14) is fixedly connected with a connecting rod one (15), the end, away from the fixed plate one (14), of the connecting rod one (15) is fixedly connected with the inner wall of the connecting pipe one (12), the other end of the connecting shaft (16) is fixedly connected with a fixed plate two (18), the side edge of the fixed plate two (18) is fixedly connected with a connecting rod two (19), the end, away from the fixed plate two (18), of the connecting rod two (19) is fixedly connected with the inner wall of the hollow shaft (10), the bottom of the liquid pump (21), the connecting pipe three (22), the connecting pipe one (12), the connecting pipe two (20) and the supporting plate (11) is fixedly connected with the top of the sealing cover (8).

7. A device for modifying the color of black walnut by steeping according to claim 6, wherein: The sealing mechanism includes a sealing bin (25), the outer wall of the sealing bin (25) is fixedly connected with a mounting plate (26) on both sides, the top of the sealing cover (8) is provided with a screw hole (23), the mounting plate (26) is fixedly connected with the top of the sealing cover (8) through a screw and the screw hole (23), the bottom edge of the sealing bin (25) is attached with a sealing gasket, the bottom of the sealing gasket is attached with the side edge of the supporting plate (11) and the top of the sealing cover (8).

8. A device for modifying the color of black walnut by steeping according to claim 5, wherein: Both sides of the soaking bin (1) are fixedly connected with a liquid feeding pipe (24), the bottom opening of the connecting pipe two (20) and the connecting pipe one (12) is fixedly connected with a clamping ring (36), the clamping ring (36) is slidingly clamped with the inner wall of the liquid feeding pipe (24), the outer wall of the sealing cover (8) is fixedly sleeved with a sealing frame (35) on the lower side, both sides of the sealing frame (35) are penetratingly threaded with a hand screw bolt (30), both sides of the outer wall of the soaking bin (1) are provided with a positioning hole, the tail end of the hand screw bolt (30) is threaded into the inner wall of the positioning hole of the soaking bin (1).

9. A device for modifying the color of black walnut by steeping according to claim 5, wherein: The inner wall of the sealing cover (8) is integrated with a temperature sensor, a pressure sensor and a liquid level sensor, the top of the sealing cover (8) is fixedly connected with a pressurizing valve (27), a liquid adding valve (28) and a handle (29), both sides of the soaking bin (1) are fixedly connected with liquid adding pipes (31), the inside of the soaking bin (1) is provided with a flow-through groove and is in through connection with the liquid adding pipes (31), the bottom of the soaking bin (1) is fixedly connected with a base (32), and the bottom of the base (32) is fixedly connected with a bottom plate (33).

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