A bamboo tube type furniture inner wall polishing device and method

Abstract

The present application relates to a kind of bamboo tube type furniture inner wall polishing device and method, belong to furniture processing field.The bamboo tube type furniture inner wall polishing device described in the present application includes two groups of supporting roller, lifting type press roll, polishing wheel, for exerting the exciting force of exciting vibrator perpendicular to the axial direction of wheel body on polishing wheel.Existing polishing wheel structure is improved in the present application, by adding exciting vibrator and making it with polishing wheel docking, exciting vibrator can exert the exciting force of exciting vibrator perpendicular to the axial direction of wheel body on polishing wheel, to improve the polishing effect on the inner wall of bamboo tube type furniture.For difficult polishing bamboo joint ring, by the eccentricity between the wheel body center axis of polishing wheel and the third columnar center axis of exciting vibrator, the polishing of bamboo joint ring is improved.For uneven dry bamboo tube type furniture, by setting cavity, lead ball in the first columnar of exciting vibrator, so that lead ball can achieve "dynamic balance" during the working process of exciting vibrator, to avoid polishing defects.

Description

Technical Field

[0001] This invention relates to the field of furniture processing technology, specifically to a device and method for polishing the inner wall of bamboo tube furniture. Background Technology

[0002] Bamboo furniture is a type of furniture made from raw bamboo or bamboo materials, and it is an important branch of the furniture industry. The application of new materials such as bamboo laminated timber and reconstituted bamboo has expanded the adaptability of bamboo furniture in the field of architectural decoration.

[0003] In the bamboo furniture processing industry, bamboo tube furniture refers to furniture made from large-diameter raw bamboo (such as giant bamboo with a diameter greater than 20cm) undergoing a series of processing steps (such as bamboo degreasing, bending and straightening, sanding, bleaching and dyeing, carving, hollowing, polishing, coating, and painting). During the initial polishing of the inner wall of bamboo tube furniture (semi-finished furniture made from raw bamboo), due to the significant space, the polishing wheel can only be inserted into the bamboo tube furniture and then rotated for polishing. To improve polishing efficiency, two sets of rollers can be used simultaneously to drive the bamboo tube furniture in a reverse rotation, further improving the polishing effect. However, since the raw material for bamboo tube furniture is bamboo, although the bamboo nodes are opened, the bamboo nodes are hard, thick, and dense, and the remaining bamboo node rings after the opening make sanding and polishing difficult. This is because in industrial production... During the process, the main consideration is usually the sanding and polishing of the bamboo body, which accounts for a larger proportion. The material of the bamboo body (such as fiber orientation and density) is very different from that of the bamboo nodes. When using the same sanding wheel for the bamboo body to sand the bamboo nodes, the roughness of the bamboo nodes will be relatively greater. Therefore, polishing the bamboo nodes is more difficult. In addition, if there are burrs or protruding ribs in the bamboo nodes, the polishing difficulty is much greater. Therefore, currently, when polishing the inner wall of bamboo tube furniture, it is usually done by hand polishing the bamboo nodes after the overall bamboo body has been polished. This is time-consuming and labor-intensive, which limits the improvement of production efficiency.

[0004] Based on this, the present invention is proposed. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a polishing device and method for the inner wall of bamboo-tube furniture, the technical solution of which is as follows:

[0006] A polishing device for the inner wall of bamboo tube furniture includes two sets of rollers, a lifting pressure roller located above the two sets of rollers, and a polishing wheel. At least one set of rollers is driven to rotate by a motor. The lifting pressure roller includes a roller body, and the polishing wheel includes a wheel body and a drive shaft installed at one end of the wheel body. The axis of the wheel body, the axis of the bamboo tube furniture, and the axis of the roller body are all located in the same vertical plane. The polishing device for the inner wall of bamboo tube furniture also includes a vibrator for applying a vibration force perpendicular to the axis of the wheel body to the polishing wheel.

[0007] As a further embodiment of the present invention, the lifting pressure roller also includes an execution unit for driving the roller body to move up and down, and a roller beam is installed between the execution unit and the roller body.

[0008] As a further embodiment of the present invention, the vibrator includes a housing, a power shaft, and at least one eccentric block mounted outside the power shaft, all of which are located inside the housing. A bearing is installed between the power shaft and the housing. One end of the housing is also provided with an extension portion, and the other end of the wheel body is provided with a socket that matches the extension portion. The extension portion is connected to the socket.

[0009] As a further embodiment of the present invention, the extension includes a frustum-shaped first column, a cylindrical second column, and a conical third column, wherein the first column, the second column, and the third column are all coaxial and integrally connected; the insertion hole is a conical hole corresponding to the tip of the third column.

[0010] As a further aspect of the present invention, the first column has a spherical cavity inside, and a lead ball is placed inside the cavity.

[0011] As a further embodiment of the present invention, the drive shaft is coaxially arranged with the wheel body, and the central axis of the wheel body and the central axis of the third column are eccentrically arranged with an eccentricity of 0.8mm.

[0012] As a further embodiment of the present invention, a docking post is provided at the other end of the wheel body, the docking post is fixedly connected to the wheel body, and the insertion hole is provided on the outer end face of the docking post.

[0013] As a further aspect of the present invention, the ratio of the volume of the lead ball to the volume of the cavity is x, where 0.11 ≤ x ≤ 0.16.

[0014] A method for polishing the inner wall of bamboo tube furniture, comprising the following steps, using the aforementioned bamboo tube furniture inner wall polishing device to polish the inner wall of the bamboo tube furniture:

[0015] Step 1: Move the roller body upwards using the lifting pressure roller until a sufficient gap is exposed between the roller body and the support roller for the bamboo tube furniture to pass through.

[0016] Step 2: The bamboo tube furniture is pushed between two sets of rollers;

[0017] Step 3: Use the lifting pressure roller to lower the roller until it presses the bamboo tube furniture firmly.

[0018] Step 4: Move the polishing wheel until it extends into the inside of the bamboo tube furniture, so that the polishing wheel contacts the inner wall of the bamboo tube furniture; move the vibrator until the tip of the third column aligns with the insertion hole.

[0019] Step 5: Both the polishing wheel and the vibrator are started. The polishing wheel polishes the inner wall of the bamboo tube furniture, and the vibrator applies a vibration force perpendicular to the wheel axis to the polishing wheel.

[0020] Step 6: After polishing is complete, remove the polishing wheel from the bamboo tube furniture, remove the vibrator, and use the lifting pressure roller to move the roller upwards, then remove the bamboo tube furniture from between the two sets of support rollers.

[0021] As a further aspect of the present invention, during the polishing process, the polishing wheel and the vibrator synchronously perform translational reciprocating motion.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This invention improves the structure of existing polishing wheels by adding a vibrator that connects to the polishing wheel. The vibrator applies a vibration force perpendicular to the wheel's axis, thus enhancing the polishing effect on the inner walls of bamboo-tube furniture. For the difficult-to-polish bamboo joints, the polishing is improved by eccentrically positioning the central axis of the polishing wheel and the central axis of the third column of the vibrator. For bamboo-tube furniture with uneven drying, a cavity and lead balls are incorporated into the first column of the vibrator, allowing the lead balls to achieve dynamic balance during operation and preventing polishing defects. Attached Figure Description

[0024] Figure 1 A schematic diagram of a polishing device for the inner wall of bamboo tube furniture;

[0025] Figure 2 This is a schematic diagram of the connection between the polishing wheel and the vibrator. Detailed Implementation

[0026] The present invention will be described in detail below with reference to specific embodiments. These embodiments are merely some, not all, implementations of the present invention. All other implementations obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1 , 2 As shown, a polishing device for the inner wall of bamboo tube furniture includes two sets of rollers 20, a lifting pressure roller located above the two sets of rollers 20, and a polishing wheel. At least one set of rollers 20 is driven to rotate by a motor. In this example, one set of rollers 20 is driven to rotate by a motor as the active roller. The bamboo tube furniture 10 is placed between the two sets of rollers 20 and the friction force drives the bamboo tube furniture 10 to rotate.

[0029] The lifting pressure roller includes a roller body 31, and the polishing wheel includes a wheel body 51 and a drive shaft 52 installed at one end of the wheel body 51. The axis of the wheel body 51, the axis of the bamboo tube furniture 10 and the axis of the roller body 31 are all located in the same vertical plane. The inner wall polishing device of the bamboo tube furniture also includes a vibrator for applying a vibration force perpendicular to the axis of the wheel body 51 to the polishing wheel.

[0030] The roller 31 is lifted and lowered under the drive of the lifting pressure roller, thereby pressing the bamboo tube furniture 10 tightly.

[0031] The vibrator is used to apply a vibration force perpendicular to the axis of the wheel body 51 to the polishing wheel, thereby improving the polishing effect.

[0032] The vibrator includes a housing 61, a power shaft 62, and at least one eccentric block 63 mounted outside the power shaft 62. The eccentric blocks 63 are all located inside the housing 61. A bearing 64 is installed between the power shaft 62 and the housing 61. One end of the housing 61 is also provided with an extension, and the other end of the wheel body 51 is provided with a socket that matches the extension. The extension is connected to the socket.

[0033] The extension includes a frustum-shaped first column 65, a cylindrical second column 67, and a conical third column 68, all of which are coaxial and integrally connected; the insertion hole is a conical hole corresponding to the tip of the third column 68.

[0034] For the vibrator, the power shaft 62 is driven to rotate by a motor. The rotation of the power shaft 62 will drive the eccentric block 63 to rotate. The eccentric block 63 is usually a fan-shaped structure. It will generate centrifugal force during rotation, thereby generating a vibration force perpendicular to the axis of the wheel body 51.

[0035] In some embodiments, for polishing the bamboo body of bamboo tube furniture 10, the fiber texture is evenly distributed and the structure is not dense. Even if the central axis of the wheel 51 and the central axis of the third column 68 are coaxial, the polishing rate can be increased because the vibrator generates excitation force. However, since it is for polishing, not grinding, even if the polishing time is extended, it is difficult to achieve the ideal polishing effect for the bamboo joint rings, which are very difficult to polish. In this case, if the speed of the power shaft 62 is increased to increase the excitation force, it is found that the vibration system becomes unstable, and the amplitude occasionally increases sharply, resulting in a large number of polishing defects (such as scratches, atomization, etc.). In this case, after a large number of experiments, it was found that:

[0036] By setting the central axis of wheel 51 and the central axis of the third column 68 eccentrically, with an eccentricity of 0.8mm, it was found that the bamboo joint ring could be quickly polished in a short time with good polishing effect.

[0037] The setting of the eccentricity is very important. Taking giant bamboo with a diameter of 21~23cm as an example, the time required to polish one section of bamboo joint was used as the test. The polishing time was set to 5 minutes. The test structure is shown in Table 1:

[0038] Table 1

[0039]

[0040] A method for polishing the inner wall of bamboo tube furniture, comprising the following steps: using the aforementioned bamboo tube furniture inner wall polishing device to polish the inner wall of the bamboo tube furniture 10.

[0041] Step 1: Move the roller 31 upwards using the lifting pressure roller until a sufficient gap is exposed between the roller 31 and the support roller 20 for the bamboo tube furniture 10 to pass through.

[0042] Step 2: The bamboo tube furniture 10 is pushed between the two sets of rollers 20;

[0043] Step 3: Move the roller 31 down using the lifting pressure roller until the roller 31 presses the bamboo tube furniture 10 tightly;

[0044] Step 4: Move the polishing wheel body 51 until the polishing wheel body 51 extends into the bamboo tube furniture 10, so that the polishing wheel body 51 contacts the inner wall of the bamboo tube furniture 10; move the vibrator until the tip of the third column 68 aligns with the insertion hole.

[0045] Step 5: Both the polishing wheel and the vibrator are started. The polishing wheel polishes the inner wall of the bamboo tube furniture 10, and the vibrator applies a vibration force perpendicular to the axis of the wheel body 51 to the polishing wheel.

[0046] Step 6: After polishing is completed, remove the polishing wheel 51 from the bamboo tube furniture 10, remove the vibrator, and move the roller 31 upward using the lifting pressure roller to remove the bamboo tube furniture 10 from between the two sets of support rollers 20.

[0047] During the polishing process, multiple polishing techniques can be used. After each polishing, polishing wheels of different grit sizes or materials can be used to meet different polishing needs.

[0048] During the polishing process, the polishing wheel and the vibrator move synchronously in a reciprocating motion. For example, they move forward and backward synchronously along the axial direction of the drive shaft 52, thereby ensuring that the tip of the third column 68 aligns correctly with the insertion hole.

[0049] Example 2

[0050] Unlike other woods, bamboo has a significantly different structure at the nodes compared to the bamboo body. Improper drying processes can easily lead to uneven drying. For bamboo tube furniture, the moisture content of the bamboo body is generally between 8% and 12% to ensure stability and prevent cracking and warping. With uniformly dried wood, the difference in moisture content between any two points is usually less than 2%. However, with unevenly dried bamboo, the difference in moisture content between the bamboo body and the nodes can exceed 4%. This large difference in moisture content makes polishing at the junction of the bamboo body and nodes difficult.

[0051] Therefore, the exciter is further improved as follows:

[0052] The first column 65 has a spherical cavity 651 inside, and a lead ball 66 is disposed inside the cavity 651. The ratio of the volume of the lead ball 66 to the volume of the cavity 651 is x, where 0.11 ≤ x ≤ 0.16. For example, x = 0.12.

[0053] In this example, the lead ball 66 acts as a counterweight, rotating along with the first column 65. When the polishing wheel reaches the junction of the bamboo body and the bamboo node, the bamboo body is relatively smoother, while the bamboo node is relatively rougher and may have burrs. This results in greater resistance for the polishing wheel at the bamboo node. Polishing at this junction causes the first column 65 to undulate slightly due to the continuous contact between the polishing wheel and the bamboo body and node. The first column 65 itself also undulates regularly due to the vibration force generated by the vibrator. The combined effect of these two factors causes the lead ball 66 within the cavity 651 to eventually reach "dynamic balance," thus continuously correcting the frictional force of the polishing wheel at the junction of the bamboo body and node, achieving a stable state and preventing polishing defects. In this embodiment, due to the use of the lead ball 66, even when the moisture content difference between the bamboo body and the bamboo node reaches 5.3%, no polishing defects were found after 5 minutes of polishing.

[0054] Conversely, if the first column 65 is a solid structure without cavities, and the moisture content difference between the bamboo body and the bamboo node is less than 2%, no polishing defects were found after 5 minutes of polishing. However, when the moisture content difference between the bamboo body and the bamboo node is 4.6%, 6 crack defects were found after 5 minutes of polishing.

[0055] The volume of the lead ball 66 and the size ratio of the cavity 651 significantly affect the "dynamic balance" effect of the lead ball 66. Therefore, when x=0.08, polishing a bamboo tube furniture 10 with a moisture content difference of 5.1% between the bamboo body and the bamboo node reveals 3 groove defects after 5 minutes of polishing. When x=0.24, polishing a bamboo tube furniture 10 with a moisture content difference of 5.6% between the bamboo body and the bamboo node reveals 5 crack defects after 5 minutes of polishing.

[0056] Example 3

[0057] In this example, to facilitate the feeding and unloading of bamboo tube furniture 10, the lifting pressure roller also includes an execution unit 33 for driving the roller body 31 to move up and down, and a roller beam 32 is installed between the execution unit 33 and the roller body 31.

[0058] The execution unit 33 is one of a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or a screw jack. In this example, the execution unit 33 is preferably a pneumatic cylinder.

[0059] Example 4

[0060] Because polishing wheels on the market, although made of metal (such as iron), usually have an unhardened central area that cannot withstand prolonged vibration from the vibrator. To solve this problem, a docking post 53 is provided at the other end of the wheel body 51. The docking post 53 is fixedly connected to the wheel body 51, and the insertion hole is located on the outer end face of the docking post 53.

[0061] The docking post 53 is made of hardened metal and is bolted to the other end of the wheel body 51.

[0062] Furthermore, it should be understood that those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A polishing device for the inner wall of bamboo tube furniture, used to polish the inner wall of bamboo tube furniture (10), the polishing device comprising two sets of rollers (20), a lifting pressure roller located above the two sets of rollers (20), and a polishing wheel, wherein at least one set of rollers (20) is driven to rotate by a motor, the lifting pressure roller comprises a roller body (31), the polishing wheel comprises a wheel body (51) and a drive shaft (52) mounted on one end of the wheel body (51), wherein the axis of the wheel body (51), the axis of the bamboo tube furniture (10) and the axis of the roller body (31) are all located in the same vertical plane, characterized in that: The bamboo tube furniture inner wall polishing device also includes a vibrator for applying a vibration force perpendicular to the axis of the wheel body (51) to the polishing wheel; The vibrator includes a housing (61), a power shaft (62), and at least one eccentric block (63) installed outside the power shaft (62). The eccentric blocks (63) are all located inside the housing (61). A bearing (64) is installed between the power shaft (62) and the housing (61). One end of the housing (61) is also provided with an extension. The other end of the wheel body (51) is provided with a socket that matches the extension. The extension is connected to the socket. The extension includes a frustum-shaped first column (65), a cylindrical second column (67), and a conical third column (68), wherein the first column (65), the second column (67), and the third column (68) are all coaxial and integrally connected; the insertion hole is a conical hole corresponding to the tip of the third column (68). The first column (65) has a spherical cavity (651) inside, and a lead ball (66) is placed inside the cavity (651). The drive shaft (52) is coaxially arranged with the wheel body (51), and the central axis of the wheel body (51) is eccentrically arranged with the central axis of the third column (68) with an eccentricity of 0.8mm.

2. The bamboo tube furniture inner wall polishing device according to claim 1, characterized in that: The lifting pressure roller also includes an execution unit (33) for driving the roller body (31) to lift and lower, and a roller beam (32) is installed between the execution unit (33) and the roller body (31).

3. The bamboo tube furniture inner wall polishing device according to claim 1, characterized in that: The other end of the wheel body (51) is provided with a docking post (53), which is fixedly connected to the wheel body (51), and the insertion hole is provided on the outer end face of the docking post (53).

4. The bamboo tube furniture inner wall polishing device according to claim 1, characterized in that: The ratio of the volume of the lead ball (66) to the volume of the cavity (651) is x, where 0.11 ≤ x ≤ 0.

16.

5. A method for polishing the inner wall of bamboo tube furniture, characterized in that: Polishing the inner wall of bamboo tube furniture (10) using a polishing device for the inner wall of bamboo tube furniture as described in any one of claims 1 to 4 includes the following steps: Step 1: Move the roller (31) upward by lifting the pressure roller until a sufficient gap is exposed between the roller (31) and the support roller (20) for the bamboo tube furniture (10) to enter and exit; Step 2: The bamboo tube furniture (10) is pushed between two sets of rollers (20); Step 3: Move the roller (31) down using the lifting roller until the roller (31) presses the bamboo tube furniture (10) tightly; Step 4: Move the polishing wheel body (51) until the polishing wheel body (51) extends into the bamboo tube furniture (10) so that the polishing wheel body (51) contacts the inner wall of the bamboo tube furniture (10); move the vibrator until the tip of the third column (68) aligns with the insertion hole. Step 5: Both the polishing wheel and the vibrator are started. The polishing wheel polishes the inner wall of the bamboo tube furniture (10), and the vibrator applies a vibration force perpendicular to the axis of the wheel body (51) to the polishing wheel. Step 6: After the polishing operation is completed, remove the polishing wheel body (51) from the bamboo tube furniture (10), remove the vibrator, and move the roller body (31) up through the lifting pressure roller to take the bamboo tube furniture (10) out between the two sets of support rollers (20).

6. The method for polishing the inner wall of bamboo tube furniture according to claim 5, characterized in that: During the polishing process, the polishing wheel and the vibrator move in parallel reciprocating motion.

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