Furniture plate polishing device

Abstract

The invention provides a furniture plate polishing device which comprises a rack, the rack can convey and position plates, and a polishing unit is arranged on the rack and can move in the width direction of the rack; the grinding unit comprises a driving motor, the driving motor comprises a transmission shaft, a magnet ring and a grinding head are fixedly arranged on the transmission shaft, and the grinding unit further comprises a flash evaporation cover arranged on the outer side of the magnet ring in a sleeving mode; one end of the flash evaporation cover is connected with a steam nozzle facing the plate, the flash evaporation cover is made of an electromagnetic induction heating material, and a non-contact gap is formed between the inner wall of the flash evaporation cover and the peripheral surface of the magnet ring; a centrifugal atomizing disc is further fixedly arranged on the transmission shaft and connected with an external flow channel, and the peripheral edge of the centrifugal atomizing disc faces the inner wall of the flash evaporation cover. High-temperature and high-pressure steam is used for spraying the board, air resistance in holes of the board is removed, and high enthalpy energy carried by the steam can rapidly soften lignin and hemicelluloses in cell walls of the wood.

Description

Technical Field

[0001] This invention relates to the field of furniture board sanding technology, specifically to a furniture board sanding device. Background Technology

[0002] In recent years, wood wax oil has been widely used in the coating of high-end solid wood furniture because it can retain the natural feel and breathability of wood. However, in actual mass production, the effective penetration depth of wood wax oil is generally limited to the surface layer of 0.1~0.3mm, making it difficult to form a deep protective layer. This results in the furniture being susceptible to moisture and deformation, and having poor wear resistance in the later stages.

[0003] There are two main reasons for this pain point in the industry: Firstly, air naturally exists within the vessels and pores of wood. When a polymer coating covers the surface of the board, the air in the pores is compressed and cannot escape, creating upward pressure resistance (air resistance). Simultaneously, extremely fine wood dust generated during processing or exudates from the wood itself easily clog the capillary openings. Existing conventional sanding equipment can only address the macroscopic smoothness of the board surface, rendering it ineffective against these microscopic physical barriers. This results in the wood wax oil remaining only on the surface and unable to penetrate deeply.

[0004] Secondly, high-quality wood wax oil is rich in plant-based hard waxes and oils, and has a high viscosity at room temperature. Existing coating equipment usually lacks a heating mechanism, making it impossible to heat and reduce the viscosity of the coating liquid the moment it comes into contact with the board. Without effectively improving the fluid viscosity, the weak capillary action of the wood itself is simply insufficient to overcome the flow resistance when the liquid enters narrow pores, causing the penetration process to be forced to stop at a very shallow surface layer. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a furniture board sanding device to solve the technical problem of shallow penetration of wood wax oil.

[0006] The present invention adopts the following technical solution.

[0007] A furniture board sanding device includes a frame that can transport and position boards, and a sanding unit that can move along the width of the frame. The polishing unit includes a drive motor, the drive motor includes a transmission shaft, a magnet ring and a polishing head are fixedly mounted on the transmission shaft, and the polishing unit also includes a flash evaporation hood sleeved on the outside of the magnet ring. One end of the flash evaporation hood is connected to a steam nozzle facing the plate. The flash evaporation hood is made of an electromagnetic induction heating material, and there is a non-contact gap between its inner wall and the outer peripheral surface of the magnet ring. A centrifugal atomizing disc is also fixedly installed on the drive shaft. The centrifugal atomizing disc is connected to an external flow channel, and the outer peripheral edge of the centrifugal atomizing disc faces the inner wall of the flash evaporation hood. When the drive shaft rotates, the magnet ring and the flash evaporation hood rotate relative to each other, and the centrifugal atomizing disc ejects the liquid transmitted by the external flow channel onto the inner wall of the flash evaporation hood.

[0008] Preferably, a plurality of magnet blocks are evenly distributed on the magnet ring, and the magnetic poles of adjacent magnet blocks facing outward from the magnet ring are opposite; a sealed space is formed between the flash evaporation hood and the drive shaft, and a one-way valve is provided between the flash evaporation hood and the steam nozzle, the one-way valve being configured to open under a set pressure.

[0009] Preferably, the polishing unit further includes a gradient blowing assembly, which is used to output a gaseous fluid field with spatially different distributions to the surface of the board; the gaseous fluid field presents a temperature gradient from the inside to the outside in the radial direction, and the gaseous fluid field includes a high-temperature aerodynamic distribution area located in the central region and a low-temperature aerodynamic distribution area surrounding the periphery of the central region.

[0010] Preferably, the gradient blowing assembly further includes a first fan blade and a second fan blade fixedly disposed on the drive shaft, the first fan blade being rotatably disposed inside the flash evaporation hood; the flash evaporation hood includes an upper cover and a lower cover, the upper cover being movable along the axial direction of the drive shaft, and the polishing unit further includes a lifting member for pushing the upper cover.

[0011] Preferably, the grinding head has an airflow channel with its outlet facing the second blade and its inlet covered by a cover; when the grinding head rotates in a first direction, the cover closes the airflow channel; when the grinding head rotates in a second direction, the cover opens the airflow channel.

[0012] Preferably, the cover includes a cover plate that is pivotally mounted on the grinding head, and a turbulence protrusion is provided on one side of the cover plate.

[0013] The beneficial effects of this invention are as follows: The grinding unit of this invention uses a centrifugal atomizing disc fixed to a drive shaft to transport and distribute liquid. The liquid is propelled onto the inner wall of the flash evaporation hood by the centrifugal force generated by the rotation of the drive shaft, replacing the traditional high-pressure micro-orifice nozzle assembly. This structure eliminates the need for micro-channel design, removing the risk of pipe and nozzle blockage in dusty and coating environments from a mechanical perspective, and ensuring the stability of the equipment during long-term continuous operation.

[0014] This invention synchronously drives a magnet ring to rotate via a drive shaft, causing relative motion between the magnet ring and the flash hood made of an electromagnetic induction material. The alternating magnetic field induces eddy currents on the inner wall of the flash hood, generating heat. This design converts the single mechanical kinetic energy input from the drive shaft into heat energy required for liquid phase change in situ, eliminating the need for an external heater or independent heating circuit. This achieves multi-functional reuse of system power and significantly reduces the size of the grinding unit.

[0015] By spraying high-temperature, high-pressure steam onto the wood panels, not only is air resistance eliminated from the pores, but the high enthalpy energy carried by the steam also rapidly softens the lignin and hemicellulose in the cell walls of the wood, effectively dissolving or loosening wood extracts (such as lipids and gums) that are blocking capillaries and pits. Combined with the mechanical impact and sudden bursting effect of the steam pressure, the closed pit membranes can be physically opened, fundamentally improving the substrate's receptivity to polymer coatings through material modification. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the grinding unit of the present invention; Figure 3 This is a schematic diagram of the working process of the grinding unit of the present invention when it is in the grinding state; Figure 4 This is a schematic diagram of the working process of the polishing unit of the present invention when it is in the oiling state; Figure 5 This is a schematic diagram of the structure of the magnet ring in one embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of an open airflow channel in one embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 11. Rack; 20. Grinding unit; 21. Drive motor; 22. Drive shaft; 23. Grinding head; 31. Magnet ring; 311. Magnet block; 32. Flash hood; 321. Top cover; 322. Bottom cover; 33. Centrifugal atomizing disc; 34. External flow channel; 35. Steam nozzle; 36. One-way valve; 37. Lifting component; 41. First blade; 42. Second blade; 43. Airflow channel; 44. Cover plate; 441. Turbidity protrusion. Detailed Implementation

[0019] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0020] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] As attached Figure 1-6 A furniture board sanding device is shown, including a frame 11, which can transport and position boards. A sanding unit 20 is provided on the frame 11, and the sanding unit 20 can move along the width direction of the frame 11. The sanding unit 20 includes a drive motor 21, which includes a transmission shaft 22. A magnet ring 31 and a sanding head 23 are fixedly provided on the transmission shaft 22. The sanding unit 20 also includes a flash evaporation hood 32 sleeved on the outside of the magnet ring 31. One end of the flash evaporation hood 32 is connected to a steam nozzle 35 facing the plate. The flash evaporation hood 32 is made of electromagnetic induction heating material, and there is a non-contact gap between its inner wall and the outer peripheral surface of the magnet ring 31. A centrifugal atomizing disk 33 is also fixedly mounted on the drive shaft 22. The centrifugal atomizing disk 33 is connected to an external flow channel 34, and the outer peripheral edge of the centrifugal atomizing disk 33 faces the inner wall of the flash evaporation hood 32. When the drive shaft 22 rotates, the magnet ring 31 rotates relative to the flash evaporation hood 32, and the centrifugal atomizing disk 33 ejects the liquid transmitted by the external flow channel 34 onto the inner wall of the flash evaporation hood 32.

[0022] The magnet ring 31 has multiple magnet blocks 311 evenly distributed on it, and the magnetic poles of adjacent magnet blocks 311 facing outward from the magnet ring 31 are opposite.

[0023] Specifically, when the magnet ring 31 rotates, the magnet blocks 311 with opposite polarities evenly distributed on its surface move at high speed, generating a high-frequency alternating rotating magnetic field on the inner metal wall of the flash evaporation hood 32. Since the flash evaporation hood 32 is made of an electromagnetic induction heating material, this alternating magnetic field induces strong slip eddy currents within the metal substrate of the flash evaporation hood 32. According to Joule's law, these eddy currents are rapidly converted into heat energy under the action of metal resistance, causing the inner wall of the flash evaporation hood 32 to rapidly heat up to the set flash evaporation temperature in a very short time. Simultaneously, the drive shaft 22 drives the centrifugal atomizing disk 33 to rotate synchronously at high speed. Room temperature liquid (such as water or treatment fluid) introduced through the external flow channel 34 enters the centrifugal atomizing disk 33 and, under the action of centrifugal force, is torn into micron-sized droplets through the edge of the atomizing disk, and is thrown towards the high-temperature inner wall of the flash evaporation hood 32 at a certain radial velocity. Upon contact with the hot wall, the droplets undergo a flash phase change, rapidly expanding in volume and transforming into high-temperature, high-pressure steam.

[0024] A sealed space is formed between the flash hood 32 and the drive shaft 22. A one-way valve 36 is provided between the flash hood 32 and the steam nozzle 35. The one-way valve 36 is configured to open under a set pressure.

[0025] Understandably, in the initial stage of phase change, the one-way valve 36 is closed, making the sealed space a pressure accumulator with a fixed volume. As the flash phase change continues, the generated steam is confined within this sealed space, causing the internal pressure to continuously increase. When the internal pressure reaches the set threshold of the one-way valve 36, the one-way valve 36 is opened under pressure, and the high-pressure steam in the sealed space is released outward through the steam nozzle 35, forming a directional fluid jet.

[0026] The directional jet acts directly on the surface of the board, pretreating the wood fibers using its hydrodynamic pressure and enthalpy. Under pressure difference, the jet overcomes the gas resistance within the micropores and capillaries of the board, forcing out trapped air. Simultaneously, the heat energy carried by the steam and water molecules soften and scour free substances (such as wood flour and precipitated resin) attached to the capillary channels, thereby clearing blocked pores and improving the porosity of the substrate surface. This physical process provides a fluid channel for the subsequent penetration of liquid coatings, thus increasing the penetration depth of wood wax oil.

[0027] Furthermore, in order to prevent the surface of the wood wax oil from oxidizing and forming a crust, the sanding unit 20 also includes a gradient blowing assembly, which is used to output a gaseous fluid field with spatially different distributions to the surface of the board; the gaseous fluid field presents a temperature gradient from the inside to the outside in the radial direction, and the gaseous fluid field includes a high-temperature aerodynamic distribution area located in the central region and a low-temperature aerodynamic distribution area surrounding the periphery of the central region.

[0028] Understandably, the gradient airflow assembly dynamically intervenes in the curing process of the coating liquid by constructing a specific aerodynamic thermodynamic field through a fluid dynamic mechanism. On the working surface, the high-temperature airflow in the central region and the low-temperature airflow in the peripheral region act synchronously on the coating liquid film, creating a spatial temperature gradient in the radial direction.

[0029] Based on the physical properties of multiphase fluids, the surface tension of a fluid is negatively correlated with its temperature. The temperature difference from the center to the periphery of the gaseous fluid field formed on the surface of the coating liquid is converted into a corresponding surface tension difference, which in turn breaks the hydrostatic equilibrium inside the coating liquid. Driven by the surface tension gradient, continuous micro-vortices and longitudinal tumbling displacement are generated inside the coating liquid.

[0030] This hydrodynamic mechanism allows polymer segments on the surface of the coating to come into initial contact with ambient oxygen and undergo a preliminary cross-linking reaction, which are then drawn into the underlying layer by the flow field. Simultaneously, unreacted fluid from the underlying layer is continuously transported to the surface. This dynamic mass exchange process blocks the physical conditions necessary for a single surface layer to form a dense crust due to static oxidation, thus maintaining the mass transfer channel at the gas-liquid interface.

[0031] The gradient blowing assembly also includes a first fan blade 41 and a second fan blade 42 fixedly disposed on the drive shaft 22, wherein the first fan blade 41 is rotatably disposed inside the flash evaporation hood 32; The flash hood 32 includes an upper cover 321 and a lower cover 322. The upper cover 321 can move axially along the drive shaft 22. The grinding unit also includes a lifting member 37, which is used to push the upper cover 321.

[0032] Specifically, the first fan blade 41 is placed inside the flash evaporator 32, which is heated by electromagnetic induction, and rotates synchronously at high speed with the drive shaft 22. Under the action of fluid mechanics, the first fan blade 41 forcibly agitates and centrifugally accelerates the airflow entering the flash evaporator 32, forcing the fluid to undergo forced convection heat exchange with the extremely hot inner wall of the flash evaporator 32 with an extremely high surface heat transfer coefficient. Through this internal airflow circulation and forced heat exchange, a high-temperature airflow with a high enthalpy value is generated inside the flash evaporator 32.

[0033] Meanwhile, the lifting member 37 is configured to drive the upper cover 321 to move axially along the drive shaft 22 according to the operating mode, thereby dynamically changing the relative gap between the upper cover 321 and the lower cover 322 (or related intake and exhaust channels). When the upper cover 321 is lifted and pushed open, the intake of external air can be increased, thereby heating the external air by the flash evaporation shroud 32 to form a high-temperature airflow.

[0034] The grinding head 23 is provided with an air flow channel 43, the outlet of the air flow channel 43 faces the second fan blade 42, and the inlet of the air flow channel 43 is provided with a cover. When the grinding head 23 rotates in the first direction, the cover closes the air passage 43; When the grinding head 23 rotates in the second direction, the cover opens the air passage 43.

[0035] Understandably, the airflow channel 43 is configured as the basic air intake channel in the gradient blowing assembly. Its main purpose is to introduce ambient temperature cold air from the external environment of the grinding unit 20 into the system under specific operating modes, and transform it into a peripheral low-temperature airflow with spatial distribution differences via a fluid acceleration mechanism.

[0036] When the grinding head 23 rotates in the first direction (i.e., in physical cutting mode), the aerodynamic resistance caused by the rotation direction forces the cover to fit tightly against the inlet of the airflow channel 43, completely sealing the airflow channel 43. In this high-dust operating mode, the airflow channel 43 is physically blocked. This dynamic sealing mechanism effectively prevents high concentrations of wood dust and particulate impurities from invading back into or clogging the precision air passages and transmission components inside the device, achieving purely mechanical adaptive dustproof isolation.

[0037] When the polishing head 23 rotates in the second direction (i.e., in the wood wax oil coating mode), the reversal of the transmission direction causes a change in the airflow pressure direction, driving the cover to deflect to the open position. At this time, clean, ambient temperature air is smoothly introduced and, under the centrifugal suction and acceleration of the high-speed rotating second fan blade 42, is transformed into a strong, directional cold flow field. This externally introduced ambient temperature flow field and the high-temperature flow field generated by the phase change in the central region act synchronously on the coating interface, precisely constructing a radial temperature gradient of internal heat and external cold, thus preventing the oxidation and crusting phenomenon of a single surface layer.

[0038] The cover includes a cover plate 44 that can be oscillatingly mounted on the grinding head 23, and a turbulence protrusion 441 is provided on one side of the cover plate 44.

[0039] Specifically, due to the reversal of the rotation direction, the relative airflow direction changes accordingly. At this time, the torque generated by the airflow passing over the turbulence protrusion 441 on the cover plate 44 also changes, so that when the grinding head 23 rotates in the second direction, the cover plate 44 flips under the action of the airflow.

[0040] The complete working process of this invention is as follows: The conveying mechanism of the frame 11 transports the solid wood board to be processed to the designated work station. The drive motor 21 starts, driving the transmission shaft 22 and the grinding head 23 to rotate at high speed in the first direction (e.g., counterclockwise), and the grinding unit 20 moves downward to contact the board and cut it.

[0041] During the sanding process, the cover is pressed shut by the rotational pneumatic resistance, and the airflow channel 43 is physically sealed, effectively preventing the backflow of the wood dust and water vapor mixture generated during cutting into the transmission components. Simultaneously, liquid water is pumped into the external flow channel 34 according to a set program. The water is then ejected by the centrifugal atomizing disc 33 onto the inner wall of the flash evaporation hood 32, which is heated by electromagnetic eddy currents, instantly transforming into high-temperature superheated steam. The steam is pressurized within the sealed space and acts synchronously with the mechanical cutting action of the sanding head 23 on the surface of the board. The high-temperature steam instantly softens the lignin and hemicellulose on the surface of the wood, significantly reducing physical cutting resistance and preventing dry friction scorching; at the same time, the high-pressure pulse jet of steam directly bombards the newly exposed micropores.

[0042] After the polishing process is completed, the water supply to the external flow channel 34 is stopped, and the polishing unit 20 switches to the oiling state. The drive motor 21 switches to high-speed rotation in the second direction (e.g., clockwise). As the rotation direction reverses, the cover is automatically opened due to the change in aerodynamic force, and clean, cold air from the external environment is drawn in by the second fan blade 42, transforming into a strong peripheral low-temperature airflow field. At the same time, due to the cessation of water supply and continuous electromagnetic heating, the residual moisture inside the flash evaporation hood 32 is completely vaporized and blown out, and under the stirring of the first fan blade 41, the central area is transformed into a dry, high-temperature hot airflow. At this time, the polishing unit 20 constructs a radial temperature gradient field of "internal heat and external cold" above the working surface.

[0043] Simultaneously, wood wax oil is fed into the centrifugal atomizing disc 33 through the external flow channel 34. The wood wax oil is atomized and blown onto the surface of the board. The sanding head 23 continues to rotate in the second direction, evenly spreading the sprayed coating liquid. At the same time, the central high-temperature airflow and the peripheral low-temperature airflow continuously act on the liquid coating film, and the huge surface tension difference induces intense liquid convection within the liquid film. The surface polymer chains in the early stages of cross-linking are continuously drawn into the underlying layer by microscopic eddies, and unreacted fluid from the underlying layer is continuously brought to the surface to come into contact with oxygen.

[0044] After completing the grinding and coating of a local area, the grinding unit 20 moves laterally along the width direction (Y-axis) of the frame 11 under the drive of the servo module, and in conjunction with the longitudinal feed of the sheet material (X-axis), repeats the above steps until the processing of the entire large sheet material is completed.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A furniture board sanding device, comprising a frame capable of conveying and positioning boards, a sanding unit disposed on the frame, the sanding unit being movable along the width direction of the frame; characterized in that, The polishing unit includes a drive motor, the drive motor includes a transmission shaft, a magnet ring and a polishing head are fixedly mounted on the transmission shaft, and the polishing unit also includes a flash evaporation hood sleeved on the outside of the magnet ring. One end of the flash evaporation hood is connected to a steam nozzle facing the plate. The flash evaporation hood is made of electromagnetic induction heating material, and there is a non-contact gap between its inner wall and the outer peripheral surface of the magnet ring. A centrifugal atomizing disc is also fixedly mounted on the drive shaft. The centrifugal atomizing disc is connected to an external flow channel, and the outer peripheral edge of the centrifugal atomizing disc faces the inner wall of the flash evaporation hood. When the drive shaft rotates, the magnet ring rotates relative to the flash evaporation hood, and the centrifugal atomizing disc ejects the liquid transmitted by the external flow channel onto the inner wall of the flash evaporation hood.

2. The furniture board sanding device according to claim 1, characterized in that, The magnet ring is evenly distributed with multiple magnet blocks, and the magnetic poles of adjacent magnet blocks facing outwards from the magnet ring are opposite. A sealed space is formed between the flash hood and the drive shaft, and a one-way valve is provided between the flash hood and the steam nozzle. The one-way valve is configured to open under a set pressure.

3. The furniture board sanding device according to claim 1, characterized in that, The polishing unit also includes a gradient blowing assembly, which is used to output a gaseous fluid field with spatially different distributions to the surface of the board. The gaseous fluid field presents a temperature gradient from the inside to the outside in the radial direction. The gaseous fluid field includes a high-temperature aerodynamic distribution area located in the central region and a low-temperature aerodynamic distribution area surrounding the central region.

4. The furniture board sanding device according to claim 3, characterized in that, The gradient blowing assembly also includes a first fan blade and a second fan blade fixedly mounted on the drive shaft, wherein the first fan blade is rotatably mounted inside the flash evaporation hood. The flash hood includes an upper cover and a lower cover. The upper cover is movable along the axial direction of the drive shaft. The grinding unit also includes a lifting member for pushing the upper cover.

5. A furniture board sanding device according to claim 4, characterized in that, The grinding head is provided with an air flow channel, the outlet of the air flow channel faces the second fan blade, and the inlet of the air flow channel is provided with a cover. When the grinding head rotates in the first direction, the cover closes the airflow channel; When the grinding head rotates in the second direction, the cover opens the air passage.

6. A furniture board sanding device according to claim 5, characterized in that, The cover includes a cover plate that can be oscillatingly mounted on the grinding head, and a turbulence protrusion is provided on one side of the cover plate.

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