Wood bead polishing device

Abstract

The present invention relates to a wood bead polishing device, and belongs to the field of furniture processing. The wood bead polishing device described in the present invention comprises an outer groove, an inner groove, a first driving mechanism for driving the inner groove to rotate, a second driving mechanism for driving the elastic ring to repeatedly move along the radial direction of the inner groove, a megasonic vibration generating device, and a polishing medium. The wood bead polishing device described in the present invention can significantly improve the polishing effect of the wood beads under the multiple effects of the rotating centrifugal force, the vibration force generated by the high-frequency vibration, the magnetic force, and the radial force caused by the elastic force. The present invention does not adopt the polishing method of stirring with a stirring paddle, and the wood beads do not need to be lifted up and then thrown down during polishing. The wood beads themselves are less damaged, the polishing effect is good, and the polishing efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of furniture processing, in particular to a wood bead polishing device. Background Art

[0002] Wooden beads are an important accessory in the furniture industry. After the wooden beads are turned, some of them need to be engraved with patterns according to the process requirements. Whether they are engraved with patterns or not, they need to be polished.

[0003] At present, for polishing conventional furniture pieces, fully automatic polishing machines are generally used for polishing, but the disadvantage of this equipment is that it cannot polish wooden beads in large quantities. For polishing wooden beads, a drum is generally used for polishing, and wooden beads and abrasives are all poured into the drum for polishing.

[0004] There are many different polishes (a type of oil-based polish) that can be used for wood bead polishing, and the specific choice depends on the type of wood, the desired polishing effect, and personal preference. Common polishes are as follows:

[0005] Olive Oil and Essential Oil Blend: Combine olive oil, white vinegar, and lemon or wild orange essential oil.

[0006] Walnut Oil, Beeswax and Olive Oil: Contains walnut oil, beeswax and olive oil to penetrate deep, restore the natural beauty of the wood surface and provide protection.

[0007] Mineral oil and silicone mixture: seals wood pores and provides additional protection.

[0008] Yellow wax and aviation gasoline dilution: For wooden floors, yellow wax (natural beeswax diluted with a small amount of aviation gasoline) can be used for polishing to increase gloss and act as an anti-corrosion agent.

[0009] Polyester, Phenolic Polyurethane Oils: These types of oils can be used to remove resin from the surface of wood to achieve a smooth surface.

[0010] Water-based one-component varnish: For new, untreated or unpainted floors and other rough wood surfaces, producing a fine, matt polished effect.

[0011] For wooden beads with carved patterns on the surface, stirring paddles cannot be set in the drum, otherwise the "fragile" patterns on the surface of a large number of wooden beads may be damaged; even if a drum is used for polishing, because the wooden beads will be lifted up and thrown down along with the abrasive, the general speed cannot exceed 120r / min, and polishing usually takes 1~2h. This long-term polishing has the following two defects:

[0012] 1. Long-term soaking, if the polish contains a large amount of mineral oil or gasoline diluent, may cause the surface pattern of the wooden beads to swell, and some tiny patterns will be deformed, thus affecting the visual effect.

[0013] 2. Long-term polishing, even at a low speed, will inevitably cause some pattern wear, resulting in a low pass rate for the polished wood beads, generally not exceeding 80%.

[0014] Based on this, it is necessary to invent a device that is more suitable for mass polishing of wooden beads with patterns on the surface. Summary of the invention

[0015] In view of the shortcomings of the prior art, the present invention provides a wooden bead polishing device, and its technical solution is as follows:

[0016] A wood bead polishing device comprises an outer groove, an inner groove located inside the outer groove, a first driving mechanism for driving the inner groove to rotate, an elastic ring arranged in the inner groove, a second driving mechanism for driving the elastic ring to repeatedly move along the radial direction of the inner groove, a megasonic vibration generating device for applying megasonic vibration to the inner groove, and a polishing medium filled in the elastic ring, wherein the second driving mechanism comprises a permanent magnet embedded in one side of the elastic ring and at least eight electromagnets symmetrically distributed on the outer side of the inner groove, wherein the electromagnets generate magnetic forces that repel the permanent magnets when energized; the outer groove and the inner groove are both circular groove structures, a gap is arranged between the groove bottom of the inner groove and the groove bottom of the outer groove, and the megasonic vibration generating device comprises a plurality of megasonic transducers fixedly mounted on the bottom of the outer groove, and a liquid medium for completely filling the gap between the groove bottom of the inner groove and the groove bottom of the outer groove.

[0017] As a further solution of the present invention, the first driving mechanism includes a gear box installed below the outer groove, a servo motor connected to the input end of the gear box, and a first rotating shaft connected to the output end of the gear box, the upper end of the first rotating shaft is fixedly connected to the bottom of the inner groove, the bottom of the outer groove is provided with a mounting hole for the first rotating shaft to move, the outer sleeve of the first rotating shaft is provided with a bearing, the outer sleeve of the bearing is provided with a bearing sleeve, the bearing sleeve is fixedly connected to the bottom of the outer groove, and the first rotating shaft is rotatably connected to the bottom of the outer groove.

[0018] As a further solution of the present invention, the permanent magnet is cylindrical, and one side of the elastic ring is provided with a slot recessed into the elastic ring and used to clamp the permanent magnet. The slot is connected to the elastic ring as a whole, and the permanent magnet is fixedly connected to the slot.

[0019] As a further solution of the present invention, the second driving mechanism further includes an inner ring body arranged inside the outer groove, the electromagnet is embedded in the upper part of the inner ring body, and the inner ring body is fixedly connected to the outer groove.

[0020] As a further solution of the present invention, a tapered hole with an inverted cone structure is provided on the inner side of the inner ring body, and the small end of the tapered hole extends to the lower end of the electromagnet; a distance is provided between the liquid surface of the liquid medium and the lower end of the electromagnet.

[0021] As a further solution of the present invention, the space between the liquid surface of the liquid medium and the lower end of the electromagnet is a negative pressure zone, the side wall of the outer tank is provided with an air hole connected to the negative pressure zone, the outer side of the outer tank is provided with an air connecting pipe connected to the air hole, and the air connecting pipe is connected to the vacuum pump.

[0022] As a further solution of the present invention, a slot cover for sealing the inner slot and limiting the elastic ring is provided at the top of the inner slot, and a locking bolt is installed between the slot cover and the top of the inner slot for fixing; the slot cover includes a cover plate arranged parallel to the bottom of the inner slot, and the edge of the cover plate is integrally connected with a slot matched with the top of the inner slot, and the slot and the top of the inner slot are both provided with screw holes matched with the locking bolts; a gap is provided between the cover plate and the elastic ring.

[0023] As a further solution of the present invention, the outer diameter of the elastic ring is y, the inner diameter of the inner groove is z, and 32mm≤zy≤41mm.

[0024] As a further solution of the present invention, the polishing medium is composed of an oily polishing agent, glassy carbon and rubber particles mixed in a mass ratio of (55~85):(7~12):60, the density of the rubber particles is equal to the density of the oily polishing agent, and the particle size of the rubber particles is 2~3 mm.

[0025] As a further solution of the present invention, the megasonic frequency of the megasonic transducer is 0.83 MHz; the electromagnets are energized in sequence according to a preset order and the energization time intervals are equal, the energization time interval value of the electromagnets is t, the unit is s; the rotation speed value of the inner tank is n, the unit is r / min; the number of the electromagnets is x, the unit is piece;

[0026] n, t, and x satisfy the following relationship:

[0027] n=λ*t*x, λ is a positive integer, and n is a multiple of 60.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The wooden bead polishing device of the present invention can significantly improve the polishing effect of wooden beads under multiple effects such as rotating centrifugal force, vibration force generated by high-frequency vibration, magnetic force and radial force caused by elastic force.

[0030] 2. The present invention does not adopt the polishing method of stirring with a stirring paddle, and the wooden beads do not need to be lifted up and then thrown down during polishing. The wooden beads themselves are less damaged, the polishing effect is good, and the polishing efficiency is high.

[0031] 3. After polishing the wooden beads, the wooden bead polishing device of the present invention can also improve the hardness of the surface layer of the wooden beads. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a wood bead polishing device;

[0033] Figure 2 is a schematic diagram of the structure of the elastic ring;

[0034] Figure 3 It is a connection diagram of the electromagnet and the inner ring;

[0035] Figure 4 This is a schematic diagram of the structure of the slot cover. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with specific embodiments. The embodiments described below are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. Example 1

[0037] like Figures 1 to 3 As shown, a wood bead polishing device comprises an outer groove 10, an inner groove 20 located inside the outer groove 10, a first driving mechanism for driving the inner groove 20 to rotate, an elastic ring 50 arranged in the inner groove 20, a second driving mechanism for driving the elastic ring 50 to repeatedly move along the radial direction of the inner groove 20, a megasonic vibration generating device for applying megasonic vibration to the inner groove 20, and a polishing medium filled in the elastic ring 50, wherein the second driving mechanism comprises a permanent magnet 51 embedded in one side of the elastic ring 50, at least eight electromagnets 32 symmetrically distributed on the outer side of the inner groove 20, and the electromagnets 32 are energized to generate a magnetic force that repels the permanent magnet 51; the outer groove 10 and the inner groove 20 are both circular groove structures, a gap is arranged between the bottom of the inner groove 20 and the bottom of the outer groove 10, and the megasonic vibration generating device comprises a plurality of megasonic transducers 11 fixedly mounted on the bottom of the outer groove 10, and a liquid medium 40 for completely filling the gap between the bottom of the inner groove 20 and the bottom of the outer groove 10.

[0038] When the wooden bead polishing device is in use, wooden beads and polishing media are first poured into the elastic ring 50. In the present invention, the megasonic transducer 11 first directly acts on the bottom of the outer tank 10, and can transmit high-frequency vibration to the wooden beads and polishing media in the inner tank 20 through the liquid medium 40 in the inner tank 20, thereby applying high-frequency vibration to the wooden beads and polishing media in the inner tank 20.

[0039] In this embodiment, the liquid medium 40 is preferably water (cheap and readily available); other liquids such as ethanol, vegetable oil, etc. may also be used.

[0040] At the same time, the first driving mechanism drives the inner tank 20 to rotate, while the outer tank 10 itself does not rotate. Through this design, the megasonic vibration generated by the fixed megasonic transducer 11 can be transmitted to the rotating inner tank 20.

[0041] In addition, when the electromagnet 32 ​​is energized, it generates a magnetic force that repels the permanent magnet 51, and can instantly apply a thrust to the side of the elastic ring 50 where the permanent magnet 51 is installed. The thrust can push the elastic ring 50 to perform a radial translational movement along the inner groove 20; thereafter, the electromagnets 32 at different positions (considering the rotation speed of the inner groove 20 itself, according to the set power-on sequence) are energized, which can generate a thrust in another direction to act on the elastic ring 50, so that the elastic ring 50 performs a translational movement in another direction; finally, the elastic ring 50 continuously moves repeatedly in the inner groove 20, thereby intensifying the radial force on the "shaking" of the polishing medium on the wooden beads, and further improving the polishing effect of the polishing medium on the wooden beads.

[0042] It should be noted that, since the elastic ring 50 itself is elastic, it is preferably made of beryllium bronze. The thickness of the elastic ring 50 is preferably 1-1.5 mm. When initially pushed by the magnetic force, it can instantly deform. The elastic force generated by the deformation will continue to rebound in the later recovery process, which will further intensify the "shaking" of the polishing medium on the wooden beads due to the radial force, and further improve the polishing effect of the polishing medium on the wooden beads.

[0043] Therefore, under the multiple effects of the rotating centrifugal force, the vibration force generated by the high-frequency vibration, the magnetic force and the radial force caused by the elastic force, the polishing effect of the wooden beads can be significantly improved.

[0044] The present invention does not use a polishing method with stirring paddles, and the wooden beads do not need to be lifted up and then thrown down during polishing, so the wooden beads themselves are less damaged, and the polishing effect is very good and the polishing efficiency is high. Generally, the polishing time is 7 to 11 minutes.

[0045] For some polishing media that are not easy to volatilize, after polishing, you can choose to drain, centrifuge, wipe and other methods to wipe off the polishing media remaining on the surface of the wood beads, and then put them in a cool place to dry naturally. Example 2

[0046] In Embodiment 1, there are many mechanisms that can realize high-speed rotation of the inner tank 20, and one of them is listed in the present invention, specifically:

[0047] The first driving mechanism includes a gear box 22 installed below the outer groove 10, a servo motor connected to the input end of the gear box 22, and a first rotating shaft 21 connected to the output end of the gear box 22. The upper end of the first rotating shaft 21 is fixedly connected to the bottom of the inner groove 20. The bottom of the outer groove 10 is provided with a mounting hole for the first rotating shaft 21 to move. The outer sleeve of the first rotating shaft 21 is provided with a bearing 13. The outer sleeve of the bearing 13 is provided with a bearing sleeve 12. The bearing sleeve 12 is fixedly connected to the bottom of the outer groove 10. The first rotating shaft 21 is rotatably connected to the bottom of the outer groove 10.

[0048] The first rotating shaft 21 and the inner tank 20 are driven to rotate by the servo motor and the gear box 22 . Meanwhile, due to the arrangement of the bearing 13 and the bearing sleeve 12 , the outer tank 10 can remain stationary. Example 3

[0049] In Example 1, there are many ways to install the permanent magnet 51. Among them, the method to minimize the damage to the wooden beads is as follows:

[0050] The permanent magnet 51 is cylindrical, and a slot 501 is provided on one side of the elastic ring 50, which is recessed into the elastic ring 50 and used to clamp the permanent magnet 51. The slot 501 is connected to the elastic ring 50 as a whole, and the permanent magnet 51 is fixedly connected to the slot 501 (such as by gluing). Example 4

[0051] In Example 1, because the inner tank 20 rotates, and the liquid medium 40 only floods the bottom of the inner tank 20, it is easy for the liquid to splash. In addition, the closer the electromagnet 32 ​​is to the side wall of the inner tank 20, the better the magnetic force it generates. Based on this:

[0052] The second driving mechanism further includes an inner ring body 30 disposed inside the outer groove 10 , the electromagnet 32 ​​is embedded in the upper portion of the inner ring body 30 , and the inner ring body 30 is fixedly connected to the outer groove 10 .

[0053] The inner side of the electromagnet 32 ​​and the inner side of the inner ring body 30 are designed with a common arc surface, and there is a clearance fit between the arc surface and the outer wall of the inner groove 20. Such a design, on the one hand, meets the water blocking requirement, and even if the liquid splashes, it can block most of the liquid from flying out; secondly, the distance between the electromagnet 32 ​​and the outer wall of the inner groove 20 is minimized. Example 5

[0054] In Example 4, after long-term observation, it was found that although it was megasonic vibration, some bubbles would be generated in the water in a relatively sealed environment, especially rotation would aggravate the generation of bubbles. These bubbles need to be removed in time, otherwise long-term continuous operation may cause a lot of erosion to the gap between the sealing cover of the bearing 13 and the outer ring / inner ring of the bearing. If the erosion expands to a certain extent, it will cause water immersion inside the bearing 13. The rusted bearing will produce a lot of wear in a short time and need to be replaced. The intuitive manifestation is that after the wooden bead polishing device has accumulated 360 hours of polishing operation, after the bearing 13 is removed, it is found that the steel balls in the bearing 13 are rusted. The installation and disassembly of the bearing 13 are relatively complicated and not suitable for frequent replacement. Based on this, further improvements are needed:

[0055] A tapered hole 31 with an inverted cone structure is provided inside the inner ring body 30 , and the small end of the tapered hole 31 extends to the lower end of the electromagnet 32 ​​; a distance is provided between the liquid surface of the liquid medium 40 and the lower end of the electromagnet 32 ​​.

[0056] In addition, the space between the liquid surface of the liquid medium 40 and the lower end of the electromagnet 32 ​​is a negative pressure zone, and the side wall of the outer tank 10 is provided with an air hole 33 connected to the negative pressure zone, and the outer side of the outer tank 10 is provided with an air connection pipe 34 connected to the air hole 33, and the air connection pipe 34 is connected to an air pump. The air pump does not need to use a vacuum pump, but only needs to use a vortex air exhaust fan (maximum negative pressure -11kPa) to exhaust air from the negative pressure zone, so that the negative pressure zone maintains a negative pressure state.

[0057] The small end of the tapered hole 31 refers to the end with the smallest diameter. By setting the tapered hole 31, the negative pressure zone is smaller as it moves upward, which is more conducive to defoaming; coupled with the negative pressure in the negative pressure zone, the bubbles in the liquid medium 40 are eliminated to the maximum extent, thereby minimizing the erosion of the bearing 13. For example, when the vacuum pump is started, after the wooden bead polishing device has accumulated polishing operations for 1200 hours, after the bearing 13 is removed, no rust is found on the steel ball in the bearing 13.

[0058] In other embodiments, to facilitate drainage, a drainage valve is provided below the outer tank 10 for drainage.

[0059] In addition, during the initial water inflow, water may also be reversely inflowed into the outer tank 10 through the drain valve. Example 6

[0060] In Example 1, in order to prevent the polishing medium in the inner tank 20 from occasionally splashing, Figure 1 and Figure 4As shown, a slot cover 60 for sealing the inner slot 20 and limiting the elastic ring 50 is provided at the top of the inner slot 20, and a locking bolt 61 is installed between the slot cover 60 and the top of the inner slot 20 for fixing; the slot cover 60 includes a cover plate 601 arranged parallel to the bottom of the inner slot 20, and the edge of the cover plate 601 is integrally connected with a slot 602 adapted to the top of the inner slot 20, and the slot 602 and the top of the inner slot 20 are both provided with screw holes 603 adapted to the locking bolt 61; a gap is provided between the cover plate 601 and the elastic ring 50.

[0061] In the present invention, the inner groove 20 is sealed by providing a cover, thereby effectively preventing the polishing medium and wooden beads in the inner groove 20 from splashing. At the same time, the cover plate 601 also serves to limit the elastic ring 50. Example 7

[0062] In Example 1, the working parameters of the wooden bead polishing device are as follows:

[0063] The outer diameter of the elastic ring 50 is y, the inner diameter of the inner groove 20 is z, 32mm≤zy≤41mm; in this embodiment, preferably, z=826mm, y=789mm, zy=37mm.

[0064] The polishing medium is composed of an oily polishing agent, glassy carbon and rubber particles mixed in a mass ratio of (55-85):(7-12):60. The density of the rubber particles is equal to the density of the oily polishing agent, and the particle size of the rubber particles is 2-3 mm.

[0065] The density of existing rubber particles is usually between 0.677 and 1.2 g / cm³, the density of vegetable oil is usually between 0.91 and 0.94 g / cm³, and the density of glassy carbon is usually around 1.5 g / cm³. By pouring rubber particles into the oily polishing agent, scooping up the rubber particles that float or sink to the bottom, the rubber particles suspended in the middle are the rubber particles with the same density as the oily polishing agent.

[0066] As polishing continues, the oily polishing agent and glassy carbon in the polishing medium are continuously taken out, so the oily polishing agent and glassy carbon need to be replenished regularly.

[0067] The megasonic frequency of the megasonic transducer 11 is 0.83 MHz; the electromagnets 32 are energized in sequence according to a preset order and the energization time intervals are equal, and the energization time interval value of the electromagnets 32 is t, in units of s; the rotation speed value of the inner tank 20 is n, in units of r / min; the number of the electromagnets 32 is x, in units;

[0068] n, t, and x satisfy the following relationship:

[0069] n=λ*t*x, λ is a positive integer, and n is a multiple of 60.

[0070] In this example, 36 electromagnets 32 are provided, x=36; t=2, and the rotation speed of the inner tank 20 is 360 r / min, that is, n=360; λ=5.

[0071] Or, x=18, t=4, λ=5, n=360.

[0072] It should be noted that, the 36 electromagnets 32 make the angle between two adjacent electromagnets be 10°. According to the rotational speed of the inner groove 20, the power-on time interval value of the electromagnet 32, etc., n, t, and x must satisfy the above-mentioned proportional relationship (for example, if the rotational speed is 300 r / min, there are 36 electromagnets, and the power-on time interval value of the electromagnet cannot be a fixed value). Otherwise, it will not only be difficult to control, but also the elastic ring 50 will easily be disturbed and disordered, resulting in intermittent very harsh noise during polishing (indicating that the entire dynamic balancing system is not stable).

[0073] Olive oil is the oily polish. The material of the wooden beads is red pine, and half of the surface of the wooden beads is carved with spiral lines, with a width of 1mm.

[0074] 100 wooden beads were polished at one time, and the polishing pass rate was calculated after polishing. The criteria for judging unqualified polishing were: spiral deformation, spiral fracture, surface pits, etc. on the surface of wooden beads were all unqualified. Among them, wooden beads with spiral deformation are inferior products; if harder wood is used, the surface pit defects can be reduced; spiral fracture is a serious defect, indicating that the polishing process will cause great damage to the wood, whether it is softwood or hardwood, the only difference is the number of cracks. Therefore, it is necessary to detect the maximum number of fractures in the spiral of a single wooden bead, using P max express.

[0075] For all wooden beads with spiral fractures, the number of spiral cracks was observed and counted using a magnifying glass; the final observation yielded P max value.

[0076] The polished wooden beads are dried at 40°C for 3-5 days, and the moisture content of the dried wooden beads is controlled at 6.5±0.2%. For the smooth surface of the dried wooden beads (the area without spiral patterns), according to GB / T 1927-2021 standard, the steel hemisphere used for measurement is replaced with a steel probe, the diameter of the lowest end of the steel probe is 3.6 mm, and the steel probe is pressed against the smooth surface of the wooden beads at a speed of 3-6 mm per minute until it is pressed into a depth of 2.4 mm (according to a large number of experiments conducted by the inventor, olive oil is used to polish red pine wood, and the immersion depth of olive oil is 2.3-3.1 mm. Since it is found that the hardness of the surface layer of the wooden beads is improved after the polishing treatment of the present invention, only the hardness of the surface layer of the wooden beads of 2.4 mm is measured), and the load reading is recorded, and its value is F, and the unit is lbf.

[0077] The test results of this example are: the polishing pass rate is 94%, P max =1, F=70.5 lbf. The wooden bead before polishing has F=51.3 lbf; that is, the wooden bead surface hardness can be improved by polishing the wooden bead with the wooden bead polishing device of the present invention, and the improvement reaches 37.4%. Comparative Example 1

[0078] The difference from Example 7 is that this example uses an ultrasonic transducer instead of a megasonic transducer 11, and the rest is the same.

[0079] Polishing was performed in the range of ultrasonic frequency from 20 to 50 kHz, and the polishing time was only 3 min. A large number of spiral fractures appeared. max ≥53. Comparative Example 2

[0080] The difference from Example 7 is that this example uses molecular sieve powder instead of glassy carbon, and the rest is the same. The F of the wooden beads before polishing is 50.5 lbf; the F of the wooden beads after polishing is 55.1 lbf; the improvement is 9.1%, which is limited. Comparative Example 3

[0081] The difference from Example 7 is that this example uses silicon carbide instead of glassy carbon, and the rest is the same. The F of the wooden bead before polishing is 52.0 lbf; the F of the wooden bead after polishing is 55.9 lbf; the improvement is 7.5%, which is limited. In addition, P max =27.

[0082] In the present invention, under the multiple effects of the rotating centrifugal force, the vibration force generated by the high-frequency vibration, and the radial force caused by the magnetic force and the elastic force, it plays a similar "stirring" role, thereby significantly shortening the polishing time.

[0083] It can be seen from Example 7 and Comparative Examples 2 and 3 that the megasonics combined with glassy carbon can also improve the surface hardness of the wood beads after polishing. Glassy carbon is not like ordinary carbon materials that stick to black carbon powder upon contact, and can be used for polishing. Comparative Example 4

[0084] In this example, the polishing medium is composed of an oily polishing agent and glassy carbon mixed in a mass ratio of (55-85): (7-12), and does not contain rubber particles; the rest is the same as Example 7. It is found that the addition of rubber particles does not significantly improve the polishing efficiency. However, if the polishing medium does not contain rubber particles, the wooden beads at the bottom of the inner groove 20 are prone to over-polishing, that is, the number of spiral fractures increases sharply.

[0085] If the density of the rubber particles is greater than or equal to that of the oily polishing agent, causing them to sink or float, a large amount of uneven polishing will still occur compared to Example 7. Comparative Example 5

[0086] The zy value cannot be too large, otherwise it will cause the impact to be too violent, causing P max For example, when zy=50mm, the final corresponding P max =83.

[0087] The zy value cannot be too small, otherwise the "stirring" will not be sufficient and a longer polishing time will be required. For example, when zy=20mm, it takes 37 minutes to achieve a polishing effect with a polishing pass rate of 93%.

[0088] In addition, it should be understood that those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A wood bead polishing device, characterized in that: The invention comprises an outer groove (10), an inner groove (20) located inside the outer groove (10), a first driving mechanism for driving the inner groove (20) to rotate, an elastic ring (50) arranged in the inner groove (20), a second driving mechanism for driving the elastic ring (50) to repeatedly move along the radial direction of the inner groove (20), a megasonic vibration generating device for applying megasonic vibration to the inner groove (20), and a polishing medium filled in the elastic ring (50), wherein the second driving mechanism comprises a permanent magnet (51) embedded in one side of the elastic ring (50), at least eight The electromagnets (32) are symmetrically distributed on the outside of the inner groove (20), and when energized, the electromagnets (32) generate magnetic forces that repel the permanent magnets (51); the outer groove (10) and the inner groove (20) are both circular groove structures, and a gap is provided between the groove bottom of the inner groove (20) and the groove bottom of the outer groove (10); the megasonic vibration generating device comprises a plurality of megasonic transducers (11) fixedly mounted on the bottom of the outer groove (10), and a liquid medium (40) used to completely fill the gap between the groove bottom of the inner groove (20) and the groove bottom of the outer groove (10).

2. A wood bead polishing device according to claim 1, characterized in that: The first driving mechanism comprises a gear box (22) mounted below the outer groove (10), a servo motor connected to an input end of the gear box (22), and a first rotating shaft (21) connected to an output end of the gear box (22); the upper end of the first rotating shaft (21) is fixedly connected to the bottom of the inner groove (20); the groove bottom of the outer groove (10) is provided with a mounting hole for the first rotating shaft (21) to move; the outer sleeve of the first rotating shaft (21) is provided with a bearing (13); the outer sleeve of the bearing (13) is provided with a bearing sleeve (12); the bearing sleeve (12) is fixedly connected to the groove bottom of the outer groove (10); and the first rotating shaft (21) is rotatably connected to the groove bottom of the outer groove (10).

3. A wood bead polishing device according to claim 1, characterized in that: The permanent magnet (51) is cylindrical, and a clamping groove (501) is provided on one side of the elastic ring (50) and is recessed into the elastic ring (50) and used to clamp the permanent magnet (51). The clamping groove (501) and the elastic ring (50) are connected as a whole, and the permanent magnet (51) and the clamping groove (501) are fixedly connected.

4. A wood bead polishing device according to claim 1, characterized in that: The second driving mechanism further comprises an inner ring body (30) arranged inside the outer groove (10), the electromagnet (32) being embedded in the upper part of the inner ring body (30), and the inner ring body (30) being fixedly connected to the outer groove (10).

5. A wood bead polishing device according to claim 4, characterized in that: A tapered hole (31) with an inverted cone structure is provided on the inner side of the inner ring body (30), and the small end of the tapered hole (31) extends to the lower end of the electromagnet (32); a distance is provided between the liquid surface of the liquid medium (40) and the lower end of the electromagnet (32).

6. A wood bead polishing device according to claim 5, characterized in that: The space between the liquid surface of the liquid medium (40) and the lower end of the electromagnet (32) is a negative pressure zone, the side wall of the outer tank (10) is provided with an air hole (33) connected to the negative pressure zone, and the outer side of the outer tank (10) is provided with an air connection pipe (34) connected to the air hole (33), and the air connection pipe (34) is connected to an air pump.

7. A wood bead polishing device according to claim 1, characterized in that: A slot cover (60) for sealing the inner slot (20) and limiting the position of the elastic ring (50) is arranged at the top of the inner slot (20); a locking bolt (61) is installed between the slot cover (60) and the top of the inner slot (20) for fixing; the slot cover (60) comprises a cover plate (601) arranged parallel to the bottom of the inner slot (20); a slot (602) adapted to the top of the inner slot (20) is integrally connected to the edge of the cover plate (601); the slot (602) and the top of the inner slot (20) are both provided with screw holes (603) adapted to the locking bolt (61); and a gap is provided between the cover plate (601) and the elastic ring (50).

8. A wood bead polishing device according to claim 1, characterized in that: The outer diameter of the elastic ring (50) is y, and the inner diameter of the inner groove (20) is z, 32 mm ≤ zy ≤ 41 mm.

9. A wood bead polishing device according to claim 8, characterized in that: The polishing medium is composed of an oily polishing agent, glassy carbon and rubber particles mixed in a mass ratio of (55-85):(7-12):

60. The density of the rubber particles is equal to the density of the oily polishing agent, and the particle size of the rubber particles is 2-3 mm.

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