Bamboo tube type furniture inner wall polishing device and method

Abstract

The invention relates to a bamboo tube type furniture inner wall polishing device and method, and belongs to the field of furniture processing. The bamboo tube type furniture inner wall polishing device comprises two sets of carrier rollers, a lifting type pressing roller, a polishing wheel and a vibration exciter used for applying exciting force perpendicular to the axial direction of a wheel body to the polishing wheel. According to the bamboo tube type furniture inner wall polishing device, the structure of an existing polishing wheel is improved, the vibration exciter is additionally arranged and is in butt joint with the polishing wheel, the vibration exciter can apply exciting force perpendicular to the axial direction of the wheel body to the polishing wheel, and therefore the polishing effect on the bamboo tube type furniture inner wall is improved. And for the bamboo joint ring difficult to polish, the wheel body center shaft of the polishing wheel and the third cylinder center shaft of the vibration exciter are eccentrically arranged, so that the polishing of the bamboo joint ring is improved. For the bamboo tube type furniture which is non-uniformly dried, the cavity and the shot are arranged in the first column body of the vibration exciter, so that the shot can achieve'dynamic balance 'in the working process of the vibration exciter, and the polishing defect is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of furniture processing, in particular to a device and method for polishing the inner wall of bamboo tube-type furniture. Background Art

[0002] Bamboo furniture, made from raw bamboo or bamboo-like materials, is a key component of the furniture industry. The application of new materials such as bamboo laminate and reconstructed bamboo has expanded the adaptability of bamboo furniture in architectural decoration.

[0003] In the field of bamboo furniture processing, bamboo tube furniture refers to the use of raw bamboo with a larger diameter (such as giant dragon bamboo with a diameter greater than 20cm) to undergo a series of processing (such as bamboo degreasing, bending correction, grinding and sanding, bleaching and dyeing, carving, hollowing, polishing, coating, painting, etc.). In the above processing, when the inner wall of the bamboo tube furniture (semi-finished furniture pieces made of raw bamboo) is polished for the first time, due to the significant space, the polishing wheel can only be inserted into the interior of the bamboo tube furniture, and then the polishing wheel is rotated for polishing; in order to improve the polishing efficiency, two sets of rollers can be used to drive the bamboo tube furniture to reverse synchronously to further improve the polishing effect; however, since the raw material of bamboo tube furniture is bamboo, although the bamboo nodes are opened up, the texture of the bamboo nodes is relatively hard, and the structure is thick and dense. The bamboo node rings left by the through bamboo nodes are difficult to grind and polish; because in the industrial production process, During the polishing process, the main consideration is usually the grinding and polishing of the bamboo body, which accounts for a larger proportion. The material of the bamboo body (such as fiber orientation, density, etc.) is very different from that of the bamboo nodes. When the grinding wheel for grinding the bamboo body is used to grind the bamboo node circle, the roughness of the bamboo node circle will be relatively larger; therefore, the polishing of the bamboo node circle is more difficult. In addition, if there are burrs or convex ribs at the bamboo node circle, the polishing difficulty is much greater; therefore, when polishing the inner wall of bamboo tube-type furniture, it is usually necessary to use manual polishing to refine the bamboo node circle after the overall polishing of the bamboo body is completed, which is time-consuming and labor-intensive, and limits the improvement of production efficiency.

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

[0005] In view of the shortcomings of the prior art, the present invention provides a device and method for polishing the inner wall of bamboo tube-type furniture, and the technical solution is as follows:

[0006] A bamboo tube-type furniture inner wall polishing device includes two groups of rollers, a lifting pressure roller located above the two groups of rollers, and a polishing wheel. At least one group of rollers is driven to rotate by a motor. The lifting pressure roller includes a roller body. The polishing wheel includes a wheel body and a driving shaft installed at one end of the wheel body. The wheel body, rollers and roller body are all coaxially arranged. The bamboo tube-type furniture inner wall polishing device also includes an exciter for applying an excitation force perpendicular to the axial direction of the wheel body to the polishing wheel.

[0007] As a further solution of the present invention, the lifting type pressure roller further includes an execution unit for driving the roller body to lift and lower, and a roller beam is installed between the execution unit and the roller body.

[0008] As a further solution of the present invention, the exciter includes a shell, a power shaft, and at least one eccentric block installed on the outside of the power shaft. The eccentric blocks are all located inside the shell, and a bearing is installed between the power shaft and the shell; one end of the shell is also provided with an extension portion, and the other end of the wheel body is provided with a socket matching the extension portion, and the extension portion is connected to the socket.

[0009] As a further solution of the present invention, the extension portion includes a truncated cone-shaped first cylinder, a cylindrical second cylinder, and a conical third cylinder. The first cylinder, the second cylinder and the third cylinder are all coaxial and integrally connected; the socket is a tapered hole corresponding to the tip of the third cylinder.

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

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

[0012] As a further solution 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 socket is provided on the outer end surface of the docking post.

[0013] As a further solution of the present invention, the ratio of the volume of the shot put to the volume of the cavity is x, 0.11≤x≤0.16.

[0014] A method for polishing the inner wall of bamboo tube-type furniture, wherein the inner wall of the bamboo tube-type furniture is polished using the bamboo tube-type furniture inner wall polishing device, comprising the following steps:

[0015] Step 1: Use the lifting roller to move the roller body upward until there is enough space between the roller body and the supporting roller for the bamboo tube furniture to enter and exit;

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

[0017] Step 3: Move the roller downwards by means of the lifting roller until the roller presses the bamboo furniture tightly;

[0018] Step 4: Move the polishing wheel until it reaches the inside of the bamboo furniture, so that the polishing wheel contacts the inner wall of the bamboo furniture; move the vibrator until the tip of the third column docks with the socket;

[0019] Step 5: The polishing wheel and the vibrator are both started, the polishing wheel polishes the inner wall of the bamboo tube furniture, and the vibrator applies an exciting force perpendicular to the axial direction of the wheel body to the polishing wheel;

[0020] Step 6. After the polishing operation is completed, the polishing wheel body is removed from the bamboo tube furniture, the vibrator is removed, the roller body is moved up by the lifting pressure roller, and the bamboo tube furniture is taken out from between the two sets of rollers.

[0021] As a further solution of the present invention, during the polishing operation, the polishing wheel and the vibrator perform synchronous translational reciprocating motion.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention improves the structure of the existing polishing wheel by adding a vibrator and docking it with the polishing wheel. The vibrator can apply an exciting force perpendicular to the axial direction of the wheel body to the polishing wheel, thereby improving the polishing effect on the inner wall of bamboo tube furniture. For the bamboo rings that are difficult to polish, the polishing of the bamboo rings is improved by eccentrically setting the center axis of the polishing wheel body and the center axis of the third column of the vibrator. For bamboo tube furniture that is unevenly dried, a cavity and a lead ball are set in the first column of the vibrator so that the lead ball can achieve "dynamic balance" during the operation of the vibrator, thereby avoiding polishing defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a polishing device for the inner wall of bamboo tube-type furniture;

[0025] Figure 2 This is a schematic diagram of the polishing wheel and vibrator docking. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to specific embodiments. The embodiments described below are only some embodiments of the present invention, not all 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.

[0027] Example 1

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

[0029] The lifting pressure roller includes a roller body 31, the polishing wheel includes a wheel body 51 and a driving shaft 52 installed at one end of the wheel body 51, and the wheel body 51, the supporting roller 20 and the roller body 31 are all coaxially arranged; the bamboo tube-type furniture inner wall polishing device also includes an exciter for applying an exciting force perpendicular to the axial direction of the wheel body 51 to the polishing wheel.

[0030] The roller body 31 is driven by the lifting roller to move up and down, thereby pressing the bamboo tube type furniture 10 tightly.

[0031] The vibrator is used to apply an exciting force perpendicular to the axial direction of the wheel body 51 to the polishing wheel, thereby improving the polishing effect.

[0032] The exciter includes a shell 61, a power shaft 62, and at least one eccentric block 63 installed on the outside of the power shaft 62. The eccentric blocks 63 are all located inside the shell 61, and a bearing 64 is installed between the power shaft 62 and the shell 61; one end of the shell 61 is also provided with an extension portion, and the other end of the wheel body 51 is provided with a socket matching the extension portion, and the extension portion is connected to the socket.

[0033] The extension portion includes a truncated cone-shaped first cylinder 65, a cylindrical second cylinder 67, and a conical third cylinder 68. The first cylinder 65, the second cylinder 67 and the third cylinder 68 are all coaxial and integrally connected; the socket is a tapered hole corresponding to the tip of the third cylinder 68.

[0034] For the vibrator, the power shaft 62 is driven to rotate by a motor. The rotation of the power shaft 62 drives 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 an exciting force perpendicular to the axial direction of the wheel body 51.

[0035] In some embodiments, when 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 body 51 is coaxial with the central axis of the third column 68, the vibrator generates an excitation force, thereby increasing the polishing rate. However, because the purpose is polishing, not grinding, it is difficult to achieve the desired polishing effect for the bamboo ring, which is particularly difficult to polish, even if the polishing time is extended. In this case, if the rotation speed of the power shaft 62 is increased to increase the excitation force, it will be found that the vibration system becomes unstable and the amplitude occasionally increases sharply, resulting in a large number of polishing defects (such as scratches and fogging). In this case, after extensive experiments, it was found that:

[0036] By eccentrically setting the central axis of the wheel body 51 and the central axis of the third column 68, when the eccentricity is set to 0.8 mm, it is found that the bamboo ring can be quickly polished in a short time and the polishing effect is good.

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

[0038] Table 1

[0039] Eccentricity / mm Polishing effect 0 Does not meet the polishing requirements, the polished surface is rough 0.5 Does not meet the polishing requirements, the polished surface is rough 0.7 The polished surface that meets the polishing requirements is intermittent and does not form a complete polished surface 0.8 Meet the polishing requirements and the polished surface is smooth 1 At least 6 scratches on the polished surface 2 At least one burnt spot appears on the polished surface

[0040] A method for polishing the inner wall of bamboo tube furniture, wherein the inner wall of the bamboo tube furniture 10 is polished using the bamboo tube furniture inner wall polishing device, comprising the following steps:

[0041] Step 1: Move the roller 31 upwards by means of a lifting roller until a sufficient gap is exposed between the roller 31 and the supporting roller 20 for the bamboo tube furniture 10 to enter and exit.

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

[0043] Step 3: Move the roller body 31 downward by means of the lifting roller until the roller body 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 docks with the socket;

[0045] Step 5: The polishing wheel and the vibrator are both started, the polishing wheel polishes the inner wall of the bamboo tube furniture 10, and the vibrator applies an exciting force perpendicular to the axial direction of the wheel body 51 to the polishing wheel;

[0046] Step 6: After the polishing operation is completed, the wheel body 51 of the polishing wheel is removed from the bamboo tube furniture 10, the vibrator is removed, the roller body 31 is moved upward by the lifting roller, and the bamboo tube furniture 10 is taken out from between the two sets of rollers 20.

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

[0048] During the polishing operation, the polishing wheel and the vibrator perform synchronous translational reciprocating motion, for example, synchronously moving forward and backward along the axial direction of the driving shaft 52, thereby ensuring that the docking between the tip of the third column 68 and the socket is correct.

[0049] Example 2

[0050] Bamboo differs from other woods in that the structure of the bamboo joints differs significantly from the main body. Improper drying can easily lead to uneven drying. For bamboo tube furniture 10, the main body typically has a moisture content of 8%-12% to ensure stability and prevent cracking and deformation. For evenly dried wood, the moisture content difference between any two locations is typically less than 2%. However, for unevenly dried bamboo, the moisture content difference between the main body and the joints can exceed 4%. This large difference in moisture between the main body and the joints can make polishing the junction between the main body and the joints difficult.

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

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

[0053] In this example, the lead ball 66 serves as a counterweight, which rotates as the first cylinder 65 rotates. When the polishing wheel moves to the junction of the bamboo body and the bamboo joint, the bamboo body is relatively smoother, and the bamboo joint is relatively rough and may have burrs, etc., which makes the resistance of the polishing wheel at the bamboo joint greater. When polishing at the junction of the bamboo body and the bamboo joint, the polishing wheel constantly contacts the bamboo body and the bamboo joint, which causes the first cylinder 65 to produce slight fluctuations. The first cylinder 65 itself also fluctuates regularly with the exciting force generated by the exciter itself. The superposition of the two will prompt the lead ball 66 in the cavity 651 to eventually reach "dynamic balance", and the friction force of the polishing wheel on the junction of the bamboo body and the bamboo joint can be continuously corrected, so that a stable state is reached and polishing defects are avoided. In this embodiment, due to the provision of the lead ball 66, even if the moisture content difference between the bamboo body and the bamboo joint reaches 5.3%, no polishing defects are found after polishing for 5 minutes.

[0054] In contrast, if the first column 65 is a solid, cavity-free structure, no polishing defects were found after 5 minutes of polishing when the moisture content difference between the bamboo body and the bamboo joints was less than 2%. However, when the moisture content difference between the bamboo body and the bamboo joints was 4.6%, six crack defects were found after 5 minutes of polishing.

[0055] The ratio of the volume of the lead ball 66 to the volume of the cavity 651 significantly affects the "dynamic balancing" effect of the lead ball 66. Therefore, if x = 0.08, when polishing a bamboo tube-type furniture 10 with a moisture content difference of 5.1% between the bamboo body and the bamboo joints, three groove defects were found after 5 minutes of polishing. If x = 0.24, when polishing a bamboo tube-type furniture 10 with a moisture content difference of 5.6% between the bamboo body and the bamboo joints, five crack defects were found after 5 minutes of polishing.

[0056] Example 3

[0057] In this example, in order to facilitate the loading and unloading of the bamboo tube furniture 10 , the lifting type pressing roller further 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 .

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

[0059] Example 4

[0060] Because polishing wheels on the market, while made of metal (such as iron), often have unhardened cores, they cannot withstand prolonged vibration from an exciter. To address this issue, 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 socket is provided on the outer end surface of the docking post 53.

[0061] The docking post 53 is made of hardened metal and is mounted on the other end of the wheel body 51 by bolts.

[0062] 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 bamboo tube furniture inner wall polishing device, comprising two groups of rollers (20), a lifting type pressure roller located above the two groups of rollers (20), and a polishing wheel, wherein at least one group of rollers (20) is driven to rotate by a motor, the lifting type pressure roller comprises a roller body (31), the polishing wheel comprises a wheel body (51), and a driving shaft (52) mounted on one end of the wheel body (51), the wheel body (51), the rollers (20) and the roller body (31) are all coaxially arranged, and characterized in that: The bamboo tube furniture inner wall polishing device further comprises a vibrator for applying an exciting force perpendicular to the axial direction of the wheel body (51) to the polishing wheel.

2. The bamboo tube furniture inner wall polishing device according to claim 1, characterized in that: The lifting type pressure roller further comprises 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 exciter comprises a housing (61), a power shaft (62), and at least one eccentric block (63) mounted on the outside of the power shaft (62); the eccentric blocks (63) are all located inside the housing (61); a bearing (64) is mounted between the power shaft (62) and the housing (61); an extension portion is further provided at one end of the housing (61); a socket matching the extension portion is provided at the other end of the wheel body (51), and the extension portion is docked with the socket.

4. The bamboo tube furniture inner wall polishing device according to claim 3, characterized in that: The extension portion comprises a truncated cone-shaped first cylinder (65), a cylindrical second cylinder (67), and a conical third cylinder (68); the first cylinder (65), the second cylinder (67), and the third cylinder (68) are all coaxial and integrally connected; and the insertion hole is a tapered hole corresponding to the tip of the third cylinder (68).

5. The bamboo tube furniture inner wall polishing device according to claim 4, characterized in that: A spherical cavity (651) is provided inside the first column (65), and a lead ball (66) is provided inside the cavity (651).

6. The bamboo tube furniture inner wall polishing device according to claim 5, characterized in that: The driving shaft (52) and the wheel body (51) are coaxially arranged, and the central axis of the wheel body (51) and the central axis of the third column (68) are eccentrically arranged, with an eccentric distance of 0.8 mm.

7. The bamboo tube furniture inner wall polishing device according to claim 4, characterized in that: The other end of the wheel body (51) is provided with a docking post (53), the docking post (53) is fixedly connected to the wheel body (51), and the socket is provided on the outer end surface of the docking post (53).

8. The bamboo tube furniture inner wall polishing device according to claim 5, characterized in that: The ratio of the volume of the lead ball (66) to the volume of the cavity (651) is x, and 0.11≤x≤0.

16.

9. A method for polishing the inner wall of bamboo tube furniture, characterized by: Polishing the inner wall of a bamboo tube-type furniture (10) using a bamboo tube-type furniture inner wall polishing device as claimed in any one of claims 1 to 8 comprises the following steps: Step 1: Move the roller body (31) upwards by means of a lifting roller until a gap sufficient for the bamboo tube-type furniture (10) to enter and exit is exposed between the roller body (31) and the supporting roller (20); Step 2: The bamboo tube furniture (10) is pushed between two sets of rollers (20); Step 3, moving the roller body (31) downward by means of a lifting pressure roller until the roller body (31) presses the bamboo tube-type furniture (10); Step 4, moving the wheel body (51) of the polishing wheel until the wheel body (51) of the polishing wheel extends into the interior of the bamboo tube furniture (10), so that the wheel body (51) of the polishing wheel contacts the inner wall of the bamboo tube furniture (10); moving the vibrator until the tip of the third column (68) is docked with the socket; Step 5: The polishing wheel and the vibrator are both started, the polishing wheel performs a polishing operation on the inner wall of the bamboo tube furniture (10), and the vibrator applies an exciting force perpendicular to the axial direction of the wheel body (51) to the polishing wheel; Step 6: After the polishing operation is completed, the wheel body (51) of the polishing wheel is removed from the bamboo tube furniture (10), the vibrator is removed, the roller body (31) is moved upward by the lifting roller, and the bamboo tube furniture (10) is taken out from between the two sets of rollers (20).

10. The method for polishing the inner wall of bamboo tube furniture according to claim 9, characterized in that: During the polishing operation, the polishing wheel and the vibrator perform translational reciprocating motion synchronously.

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