A polishing device for wooden furniture parts

Abstract

The present invention belongs to the field of furniture processing equipment and relates to a polishing device for wooden furniture parts, which includes a polishing cylinder. A high-frequency vibration plate is installed at the lower part of the polishing cylinder, and a six-degree-of-freedom motion mechanism is arranged below the high-frequency vibration plate. The six-degree-of-freedom motion mechanism includes six telescopic devices arranged obliquely and a base. The six telescopic devices are linked to adjust the tilt angle and height of the high-frequency vibration plate. The polishing device for wooden furniture parts of the present invention can polish a large number of wooden furniture parts at one time, with good polishing effect and high polishing efficiency, especially suitable for wooden furniture parts with special-shaped structures. Even when the adhesion rate of polishing residues on the abrasive reaches 47%, it can reduce the polishing damage to the wooden furniture parts without affecting the polishing efficiency. The polishing uniformity of the wooden furniture parts is good and the polishing qualification rate is high. In addition, the replacement and cleaning frequency of the abrasive used for polishing are low.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture processing equipment, and specifically, it is a polishing device for wooden furniture parts. Background Art

[0002] Furniture polishing is an important process that restores the luster of the furniture surface, protects the wood or metal surface, and extends its service life by using specific tools and materials.

[0003] Wooden furniture: Usually, wax-based polishing agents (such as beeswax, paraffin wax, etc.) or oil-based polishing agents (such as olive oil, mineral oil, etc.) are used. These polishing agents can effectively protect the wood, prevent drying and cracking, and restore the natural texture of the wood.

[0004] Vibratory polishing is an efficient and environmentally friendly surface treatment technology, which is widely used in the surface processing and polishing of materials such as metals, plastics, and glasses. Its core principle is to make the workpiece interact with abrasives and polishing fluids through high-frequency vibration, so as to achieve the effects of deburring, smoothing the surface, and improving the surface quality.

[0005] Vibratory polishing uses the high-frequency vibration of a vibration motor (usually 15Hz to 3000Hz) to make the workpiece move relative to the abrasives in the polishing fluid / agent, so as to remove the scratches, deformed layers, and impurities on the surface. Its steps usually include: putting the workpiece into a vibration tank containing abrasives and polishing fluid, and making the abrasives rub against the surface of the workpiece through vibration to achieve the polishing effect.

[0006] However, due to the relatively soft texture of the wood, during the vibratory polishing process in the vibratory polishing barrel, due to the single and limited frequency of the vibration force generated by the vibration motor, when the accumulated polishing residues in the vibratory polishing barrel (referring to various residues generated during the polishing process, including wood chips, dust, etc.) exceed a certain degree (such as the adhesion rate of polishing residues on the abrasives exceeds 22%), it is necessary to clean the abrasives, otherwise the wood will be damaged and the ideal polishing effect cannot be achieved. For such high-frequency abrasive cleaning, whether the polishing agent is a wax-based polishing agent or an oil-based polishing agent, the cleaning difficulty is relatively large, which not only limits the improvement of the polishing efficiency, but also easily causes a large amount of polishing agent waste.

[0007] Based on this, the present invention is proposed. Summary of the Invention

[0008] Aiming at the deficiencies existing in the prior art, the present invention provides a polishing device for wooden furniture parts, and its technical solution is as follows:

[0009] A polishing device for wooden furniture parts, comprising a polishing cylinder. A high-frequency vibration plate is installed at the lower part of the polishing cylinder. A six-degree-of-freedom motion mechanism is arranged below the high-frequency vibration plate. The six-degree-of-freedom motion mechanism includes six telescopic devices arranged obliquely and a base. The upper end of the telescopic device is connected to the high-frequency vibration plate and the lower end of the telescopic device is connected to the base through mounting universal joints. The six telescopic devices are linked to adjust the tilt angle and height of the high-frequency vibration plate. The lower end of the polishing cylinder is hermetically connected to the edge of the high-frequency vibration plate.

[0010] As a further scheme of the present invention, a circular through-hole is arranged in the center of the high-frequency vibration plate. A flexible layer is arranged at the through-hole. A lifting device for applying an upward impact force to the flexible layer is arranged between the flexible layer and the center of the base.

[0011] As a further scheme of the present invention, the lifting device includes a lifting unit and a ball socket joint installed at the telescopic end of the lifting unit. The lower end of the lifting unit is fixedly connected to the center of the base. A spherical segment-shaped spherical segment part is arranged at the upper end of the ball socket joint.

[0012] As a further scheme of the present invention, the flexible layer includes an upper cloth layer with a spherical crown-shaped surface, a lower cloth layer with a spherical crown-shaped surface, and a mesh plate with a spherical crown-shaped shape located between the upper cloth layer and the lower cloth layer. A buffer cavity is formed by the upper cloth layer, the lower cloth layer and the through-hole, and a non-Newtonian fluid medium is filled in the buffer cavity.

[0013] As a further scheme of the present invention, along the circumferential direction of the high-frequency vibration plate, a first ultrasonic vibrator, a second ultrasonic vibrator, and a megasonic vibrator are sequentially embedded at the edge of the high-frequency vibration plate. The ultrasonic frequency of the first ultrasonic vibrator is not equal to the ultrasonic frequency of the second ultrasonic vibrator.

[0014] As a further scheme of the present invention, the frequency of the first ultrasonic vibrator is 20 kHz. The ratio of the frequency of the second ultrasonic vibrator to the frequency of the first ultrasonic vibrator is greater than 10. The ratio of the frequency of the megasonic vibrator to the frequency of the second ultrasonic vibrator is greater than 10.

[0015] As a further scheme of the present invention, a first annular groove is arranged at the upper end of the through-hole. A first annular pressing plate for pressing the edge of the upper cloth layer is arranged at the first annular groove. A second annular groove is arranged at the lower end of the through-hole. A second annular pressing plate for pressing the edge of the lower cloth layer and the edge of the mesh plate is arranged at the second annular groove. Both the first annular pressing plate and the second annular pressing plate are connected to the high-frequency vibration plate through bolts.

[0016] As a further scheme of the present invention, at any moment, the extension amounts of the telescopic devices are not equal.

[0017] As a further solution of the present invention, the six telescopic devices are sorted in the circumferential direction of the polishing cylinder. At any moment, the corresponding values of the extension amounts of the six telescopic devices form a Fibonacci sequence.

[0018] As a further solution of the present invention, the telescopic device is one of an electric cylinder, a pneumatic cylinder, and a hydraulic cylinder;

[0019] and / or,

[0020] the lifting unit is one of an electric cylinder, a pneumatic cylinder, and a hydraulic cylinder.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The wooden furniture part polishing device of the present invention can polish a large number of wooden furniture parts at one time, with good polishing effect and high polishing efficiency, especially suitable for wooden furniture parts with special-shaped structures; even when the adhesion rate of polishing residues on the abrasive reaches 47% (far exceeding the prior art), it can reduce the polishing damage to wooden furniture parts without affecting the polishing efficiency; the polishing uniformity of wooden furniture parts is good and the polishing qualification rate is high. In addition, the replacement and cleaning frequencies of the abrasive used for polishing are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the wooden furniture part polishing device of the present invention;

[0024] Figure 2 is a schematic connection diagram of the base and the lifting device of the present invention;

[0025] Figure 3 is a schematic connection diagram of the polishing cylinder and the high-frequency vibration plate of the present invention;

[0026] Figure 4 is a schematic connection diagram of the high-frequency vibration plate and the flexible layer of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be described in detail below with reference to specific embodiments. The embodiments described below are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention. Embodiment 1

[0028] As Figure 1As shown in the figure, a polishing device for wooden furniture parts includes a polishing cylinder 10. A high-frequency vibration plate 20 is installed at the lower part of the polishing cylinder 10. A six-degree-of-freedom motion mechanism is arranged below the high-frequency vibration plate 20. The six-degree-of-freedom motion mechanism includes six telescopic devices 30 arranged obliquely and a base 40. The upper ends of the telescopic devices 30 and the high-frequency vibration plate 20, as well as the lower ends of the telescopic devices 30 and the base 40, are connected through mounting universal joints. The six telescopic devices 30 are linked to adjust the tilt angle (the angle between the plate surface of the high-frequency vibration plate 20 and the horizontal plane) and height of the high-frequency vibration plate 20. The lower end of the polishing cylinder 10 is hermetically connected to the edge of the high-frequency vibration plate 20.

[0029] First of all, the six-degree-of-freedom motion mechanism and the high-frequency vibration plate 20 constitute a six-degree-of-freedom motion platform. On the basis of the fixed base 40, with the telescopic movement of the six telescopic devices 30, the high-frequency vibration plate 20 and the polishing cylinder 10 complete the movement in six degrees of freedom in space.

[0030] When polishing wooden furniture parts, first pour polishing agent and abrasive into the polishing cylinder 10. The abrasive can be selected from brown fused alumina, silicon carbide, ceramic sand, walnut sand, alumina or black silicon carbide, and the polishing agent can be selected from wax-based polishing agent or oil-based polishing agent. First, start the high-frequency vibration plate 20 and the six-degree-of-freedom motion mechanism. After the polishing agent and abrasive in the polishing cylinder 10 are mixed for 5 - 10 minutes, then pour wooden furniture parts (such as wooden beads, wooden boards, wooden blocks, etc.) into the polishing cylinder 10. Start the high-frequency vibration plate 20 and the six-degree-of-freedom motion mechanism, vibrate and polish for 15 - 30 minutes, and then take out the wooden furniture parts to complete the polishing.

[0031] In the present invention, due to the cooperation of the high-frequency vibration plate 20 and the six-degree-of-freedom motion mechanism for polishing, even some irregular wooden furniture parts can still be effectively polished with good polishing effect. During polishing, the six-degree-of-freedom motion mechanism drives to quickly fine-tune the tilt angle and height of the high-frequency vibration plate 20 (for example, the initially horizontal high-frequency vibration plate 20 instantly becomes tilted at an angle of 3°. The instant change will cause the abrasive in the polishing cylinder 10 to be under the combined action of gravity and upward vibration force, etc.). Coupled with the high-frequency vibration force, the polishing effect can be significantly improved. In addition, under the combined action of the six-degree-of-freedom motion mechanism and the high-frequency vibration plate 20, the generated vibration force is complex and variable, and the vibration frequency spectrum range is wider. Even if the adhesion rate of the polishing residue on the abrasive in the polishing cylinder 10 exceeds 22%, without affecting the polishing efficiency, it can also reduce the polishing damage to the wooden furniture parts. The main reason is that in this vibration system, it can effectively avoid large-area caking of the abrasive with a high adhesion rate of the polishing residue. Therefore, the polishing device for wooden furniture parts described in the present invention can polish a large number of and shaped wooden furniture parts at one time, and the replacement and cleaning frequency of the abrasive is low. Embodiment 2

[0032] If the diameter of the polishing cylinder 10 is very large, for example, exceeding 50 cm, although more wooden furniture parts can be polished at one time, it is found during actual polishing that for a polishing cylinder 10 with too large a size, for wooden furniture parts with a smaller volume (such as cap heads, wooden beads, etc.), too many cannot be put in at one time. Otherwise, the polishing rate in the central area of the polishing cylinder 10 is slow, while the polishing rate in the edge area of the polishing cylinder 10 is fast. Even if a new ultrasonic oscillator or megasonic oscillator is installed in the central area of the polishing cylinder 10, it still doesn't work. After analysis, it is mainly because the six-degree-of-freedom motion mechanism drives the high-frequency vibration plate 20, and the vertical displacement change amount in the edge area of the high-frequency vibration plate 20 is much larger than that in the central area of the high-frequency vibration plate 20. The direct drawback brought by this is that during one polishing operation, uneven polishing will occur in the polishing cylinder 10. For example, over-polishing is likely to occur in the area near the polishing cylinder 10, and under-polishing is likely to occur in the central area of the polishing cylinder 10.

[0033] Therefore, as Figures 1 to 4 shown, a circular through-hole is provided in the center of the high-frequency vibration plate 20, a flexible layer is provided at the through-hole, and a lifting device for applying an upward impact force to the flexible layer is provided between the flexible layer and the center of the base 40.

[0034] The lifting device includes a lifting unit 50 and a ball socket joint 52 installed at the telescopic end of the lifting unit 50. The lower end of the lifting unit 50 is fixedly connected to the center of the base 40, and a spherical segment-shaped spherical segment part 51 is provided at the upper end of the ball socket joint 52.

[0035] The flexible layer includes an upper cloth layer 61 with a spherical crown-shaped surface, a lower cloth layer 63 with a spherical crown-shaped surface, and a mesh plate 62 with a spherical crown-shaped shape located between the upper cloth layer 61 and the lower cloth layer 63. The upper cloth layer 61, the lower cloth layer 63, and the through-hole form a buffer cavity, and a non-Newtonian fluid medium is filled in the buffer cavity.

[0036] According to the circumferential direction of the high-frequency vibration plate 20, a first ultrasonic oscillator 21, a second ultrasonic oscillator 22, and a megasonic oscillator 23 are sequentially embedded in the edge of the high-frequency vibration plate 20, and the ultrasonic frequency of the first ultrasonic oscillator 21 is not equal to the ultrasonic frequency of the second ultrasonic oscillator 22.

[0037] The frequency of the first ultrasonic oscillator 21 is 20 kHz, the ratio of the frequency of the second ultrasonic oscillator 22 to the frequency of the first ultrasonic oscillator 21 is greater than 10, and the ratio of the frequency of the megasonic oscillator 23 to the frequency of the second ultrasonic oscillator 22 is greater than 10. For example, the frequency of the second ultrasonic oscillator 22 is 260 kHz, and the frequency of the megasonic oscillator 23 is 2780 kHz.

[0038] A first annular groove is provided at the upper end of the through hole, and a first annular pressing plate 24 for pressing the edge of the upper cloth layer 61 is provided at the first annular groove; a second annular groove is provided at the lower end of the through hole, and a second annular pressing plate 25 for pressing the edges of the lower cloth layer 63 and the mesh plate 62 is provided at the second annular groove; both the first annular pressing plate 24 and the second annular pressing plate 25 are connected to the high-frequency vibration plate 20 by bolts; the sealing is carried out by adhesive sealing.

[0039] At any moment, the extension amounts of the telescopic devices 30 are not equal.

[0040] The six telescopic devices 30 can be telescoped independently and freely, and the movement of each telescopic rod is independent. The six telescopic devices 30 are arranged in the circumferential direction of the polishing cylinder 10. At any moment, the corresponding values of the extension amounts of the six telescopic devices 30 form a Fibonacci sequence; however, no limit is imposed on the inclination angle, because the inclination angle represents the natural inclination degree of the polishing cylinder 10 and the high-frequency vibration plate 20 when they are stressed. Under the same extension amount, the inclination angles may be different in the previous and subsequent times.

[0041] The telescopic device 30 is one of an electric cylinder, a pneumatic cylinder, and a hydraulic cylinder; in this example, an electric cylinder is preferably used. The lifting unit 50 is one of an electric cylinder, a pneumatic cylinder, and a hydraulic cylinder; in this example, an electric cylinder is preferably used.

[0042] The lifting unit 50 performs a lifting motion according to a set frequency (such as 0.5 Hz). During the lifting and lowering process of the lifting unit 50, it will drive the spherical segment 51 to impact the lower cloth layer 63. During the impact process, the non-Newtonian fluid medium changes from soft to hard, and finally the upper cloth layer 61 bulges upward, and the bulging surface is higher than the upper surface of the high-frequency vibration plate 20, so that the materials (such as wooden furniture parts, abrasives, polishing agents, etc.) in the central area of the polishing cylinder 10 will also be thrown upward and spread around (when the materials in the polishing cylinder 10 are in the polishing operation, they have a structure with a concave middle), thereby effectively improving the defect of insufficient polishing in the central area of the polishing cylinder 10.

[0043] The upper cloth layer 61 and the lower cloth layer 63 are preferably made of aluminum foil composite fiberglass cloth.

[0044] When the spherical segment 51 does not impact the lower cloth layer 63, under the extrusion of the material in the polishing cylinder 10, the upper cloth layer 61 is generally flattened. The non-Newtonian fluid medium is made of starch and water in a mass ratio of 2.7:1. Under the action of ultrasonic and megasonic waves, it becomes very viscous, approaching a semi-solid state (if the starch ratio is too high, it will become a semi-solid at this time). At this time, the upper cloth layer 61 is flattened, and due to the incompressibility of the non-Newtonian fluid medium, it will also cause the lower cloth layer 63 to sink downward under the through hole; when the spherical segment 51 impacts the lower cloth layer 63 subsequently, the non-Newtonian fluid medium will gradually become very hard, so that the material in the central area of the polishing cylinder 10 can be thrown upward at one time. The main function of the mesh plate 62 is to prevent the upper cloth layer 61 and the lower cloth layer 63 from being displaced excessively and causing rupture.

[0045] In addition, due to the continuous up and down movement of the edge of the high-frequency vibration plate 20 driven by the six-degree-of-freedom motion mechanism, there is no need to set up an additional shock absorption device.

[0046] In Example 2 of this case, polishing was carried out using extremely dirty abrasive (the adhesion rate of polishing residues on the extremely dirty abrasive was 51%) for 15 minutes, and it was found that there was only 1 dense pit on the polished surface. If dirty abrasive (the adhesion rate of polishing residues on the dirty abrasive was 47%) was used for polishing for the same 15 minutes, it was found that no large number of dense pits appeared on the polished surface. Example 3

[0047] In this example, the six-degree-of-freedom motion mechanism was not started, the high-frequency vibration plate 20 remained horizontal, and extremely dirty abrasive was used for polishing for the same 15 minutes. It was found that a large number of dense pits easily appeared on the polished surface.

[0048] In Example 2, polishing was carried out using extremely dirty abrasive for the same 15 minutes, and it was found that there was only 1 dense pit on the polished surface. If dirty abrasive (the adhesion rate of polishing residues on the dirty abrasive was 47%) was used for polishing for the same 15 minutes, it was found that no large number of dense pits appeared on the polished surface.

[0049] In addition, if the high-frequency vibration plate 20 is not started, it is impossible to carry out the polishing operation only relying on the force generated by the operation of the six-degree-of-freedom motion mechanism.

[0050] As can be seen from the above, in the present invention, it is necessary to use the high-frequency vibration plate and the six-degree-of-freedom motion mechanism in cooperation. Even if the adhesion rate of polishing residues on the abrasive in the polishing cylinder 10 reaches 47%, the polishing operation can still be continued. Compared with the defect that a large number of dense pits easily appear when the adhesion rate of polishing residues on the abrasive in the prior art exceeds 22%, the present invention can significantly reduce the frequency of replacing and cleaning the abrasive.

[0051] The method for measuring the adhesion rate of polishing residues on the abrasive is as follows:

[0052] Random sampling is carried out. First, the sampled abrasive is weighed to obtain the original mass of the abrasive. Then, the sampled abrasive is sent into an ultrasonic cleaning tank and cleaned in water containing detergent. After cleaning, wood chips and other sundries float on the water surface, while the abrasive and the like sink to the bottom. The abrasive sinking to the bottom is collected and dried to obtain the mass of the cleaned abrasive. The adhesion rate of the polishing residue on the abrasive = (the original mass of the abrasive - the mass of the cleaned abrasive) / the mass of the cleaned abrasive. Example 4

[0053] It is found in the experiment that for wooden furniture parts with engraved holes and patterns on the surface, when polishing with an abrasive with an adhesion rate of 22% of the surface polishing residue, different high-frequency vibration frequencies of the high-frequency vibration plate 20 will significantly affect the polishing uniformity of the wooden furniture parts. The test results are shown in Table 1:

[0054] Table 1

[0055] Experimental Group <![CDATA[f1(kHz)]]> <![CDATA[f2(kHz)]]> <![CDATA[f3(kHz)]]> Polishing uniformity 1 20 260 2780 No uneven polishing 2 20 20 20 Uneven polishing 3 20 260 260 Uneven polishing 4 20 260 1000 Uneven polishing 5 260 260 2780 Uneven polishing 6 260 260 260 Uneven polishing 7 2780 2780 2780 Uneven polishing 8 30 260 2780 Uneven polishing

[0056] The appearance of uneven polishing means that there are obvious uneven phenomena on the surface of the wooden furniture parts; f1, f2 or f3 refer to the vibration frequencies of different vibrators. If the vibration frequency is less than 1000 kHz, the first ultrasonic vibrator or the second ultrasonic vibrator is selected; if the vibration frequency is greater than or equal to 1000 kHz, the megasonic vibrator is selected. Example 5

[0057] Six telescopic devices 30 are arranged in the circumferential direction of the polishing cylinder 10. At any moment, the corresponding extension amounts of the six telescopic devices 30 are x1, x2, x3, x4, x5, and x6 respectively. The change results are shown in Table 2:

[0058] Table 2

[0059] <![CDATA[x1(mm)]]> <![CDATA[x2(mm)]]> <![CDATA[x3(mm)]]> <![CDATA[x4(mm)]]> <![CDATA[x5(mm)]]> <![CDATA[x6 (mm)]]> y(%) Abrasive throw-out (g) 1 5 6 11 17 28 47 0 1 5 9 13 17 21 26 106 1 6 12 18 24 30 47 813 5 5 11 11 28 28 33 2505

[0060] In Table 2, y refers to the maximum adhesion rate of the polishing residue on the abrasive. When the actual value of the adhesion rate of the polishing residue on the abrasive is greater than y, a large number of dense pits will appear on the polished surface after subsequent polishing.

[0061] In Table 2, the measurement method of the abrasive ejection amount is as follows: when the total volume of the abrasive in the polishing cylinder 10 reaches 80% of the volume of the polishing cylinder 10, after the polishing is completed, the total mass of the abrasive ejected from the polishing cylinder 10 is measured, which is the abrasive ejection amount. If the abrasive ejection amount is larger, it means that under the drive of the six telescopic devices 30, the tumbling in the polishing cylinder 10 is too violent, which will pose a safety hazard to the polishing of the wooden furniture parts in the polishing cylinder 10.

[0062] As can be seen from Table 2, for the six independent telescopic devices 30, their extension amounts are all unequal. If they can simultaneously satisfy the formation of a Fibonacci sequence with a large front-back change trend, it will make the maximum adhesion rate of the polishing residue on the abrasive reach 47%. At the same time, it can also meet the stability requirements of the system. Example 6

[0063] In Example 2, if 10 wooden beads with a diameter of 3.6 cm are polished at one time, the polishing qualification rate is 100%; if 100 wooden beads with a diameter of 3.6 cm are polished at one time, the polishing qualification rate is 98%. Unqualified means that the polishing does not meet the requirements.

[0064] If the non-Newtonian fluid medium is replaced with water and 100 wooden beads with a diameter of 3.6 cm are polished at one time, the polishing qualification rate is 86%.

[0065] If the non-Newtonian fluid medium is replaced with abrasive and 100 wooden beads with a diameter of 3.6 cm are polished at one time, the polishing qualification rate is 71%.

[0066] 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 can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A polishing device for wooden furniture parts, comprising a polishing cylinder (10), characterized in that: A high-frequency vibration plate (20) is installed at the lower part of the polishing cylinder (10). A six-degree-of-freedom motion mechanism is arranged below the high-frequency vibration plate (20). The six-degree-of-freedom motion mechanism includes six telescopic devices (30) arranged obliquely and a base (40). The upper ends of the telescopic devices (30) and the high-frequency vibration plate (20) as well as the lower ends of the telescopic devices (30) and the base (40) are connected through mounting universal joints. The six telescopic devices (30) are linked to adjust the tilt angle and height of the high-frequency vibration plate (20). The lower end of the polishing cylinder (10) is hermetically connected to the edge of the high-frequency vibration plate (20). A circular through-hole is provided in the center of the high-frequency vibration plate (20). A flexible layer is provided at the through-hole. A lifting device for applying an upward impact force to the flexible layer is arranged between the flexible layer and the center of the base (40). The lifting device includes a lifting unit (50) and a ball socket joint (52) installed at the telescopic end of the lifting unit (50). The lower end of the lifting unit (50) is fixedly connected to the center of the base (40). A spherical segment-shaped spherical segment part (51) is provided at the upper end of the ball socket joint (52). The flexible layer includes an upper cloth layer (61) with a spherical crown-shaped surface, a lower cloth layer (63) with a spherical crown-shaped surface, and a mesh plate (62) with a spherical crown-shaped shape located between the upper cloth layer (61) and the lower cloth layer (63). The upper cloth layer (61), the lower cloth layer (63) and the through-hole form a buffer cavity, and a non-Newtonian fluid medium is filled in the buffer cavity. At any moment, the extension amounts of the telescopic devices (30) are not equal. The six telescopic devices (30) are sorted in the circumferential direction of the polishing cylinder (10). At any moment, the corresponding values of the extension amounts of the six telescopic devices (30) form a Fibonacci sequence.

2. The polishing device for a wooden furniture part according to claim 1, characterized in that: In the circumferential direction of the high-frequency vibration plate (20), a first ultrasonic oscillator (21), a second ultrasonic oscillator (22), and a megasonic oscillator (23) are sequentially embedded in the edge of the high-frequency vibration plate (20). The ultrasonic frequency of the first ultrasonic oscillator (21) is not equal to the ultrasonic frequency of the second ultrasonic oscillator (22).

3. The polishing device for wooden furniture parts according to claim 2, wherein: The frequency of the first ultrasonic oscillator (21) is 20 kHz. The ratio of the frequency of the second ultrasonic oscillator (22) to the frequency of the first ultrasonic oscillator (21) is greater than 10. The ratio of the frequency of the megasonic oscillator (23) to the frequency of the second ultrasonic oscillator (22) is greater than 10.

4. A polishing device for wooden furniture parts according to claim 1, characterized in that: A first annular groove is provided at the upper end of the through-hole. A first annular pressing plate (24) for pressing the edge of the upper cloth layer (61) is provided at the first annular groove. A second annular groove is provided at the lower end of the through-hole. A second annular pressing plate (25) for pressing the edges of the lower cloth layer (63) and the mesh plate (62) is provided at the second annular groove. The first annular pressing plate (24) and the second annular pressing plate (25) are both connected to the high-frequency vibration plate (20) by bolts.

5. The polishing device for wooden furniture parts according to claim 1, characterized in that: The telescopic device (30) is one of an electric cylinder, a pneumatic cylinder, and a hydraulic cylinder. and / or The lifting unit (50) is one of an electric cylinder, a pneumatic cylinder, and a hydraulic cylinder.

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