A device for polishing plywood

Abstract

The application discloses a plywood polishing device, which comprises a conveying table, a polishing mechanism and a buffer mechanism. The conveying table is connected with a support. The polishing mechanism comprises a driving cylinder, a fixed plate, a floating plate and a polishing roller. The driving cylinder is connected to the support. The fixed plate is connected to the free end of the driving cylinder. The floating plate is arranged on the lower side of the fixed plate. The polishing roller is rotatably connected to the lower end surface of the floating plate. The buffer mechanism comprises a plurality of buffer rods and a plurality of springs. The buffer rods are connected between the fixed plate and the floating plate. The springs are arranged on the outer side of the buffer rods. The polishing roller can always be attached to the surface of the plywood under the action of the buffer rods and the springs. Through the setting of the self-adaptive buffer assembly, the polishing roller can always be attached to the surface of the plywood when polishing the surface of the plywood. The uneven polishing or damage of the plywood caused by the warping deformation of the plywood can be effectively avoided. In turn, the consistency of the polishing quality and the yield can be improved.

Description

Technical Field

[0001] This invention belongs to the field of plywood processing technology, and specifically relates to a plywood sanding device. Background Technology

[0002] Plywood is a sheet material made by rotary cutting logs into veneers or slicing timber into thin sheets, and then gluing them together with adhesives. During the production of plywood, in order to obtain a smooth and flat surface to meet the requirements of subsequent veneering or coating processes, the surface must be sanded to remove burrs, glue marks, and indentations.

[0003] Existing plywood sanding devices, such as the Chinese invention patent with publication number CN113021116A, disclose a device for sanding burrs on plywood surfaces based on the principle of magnetic attraction. This device uses the magnetic attraction between a driving magnetic block and a fixed magnetic block within the sanding disc to drive an arc-shaped support plate, opening and locking the sandpaper, thus enabling quick sandpaper replacement. However, in actual use, the sanding pressure of this device on the plywood mainly depends on the downward pressing action of the driving arm, which is a rigid or semi-rigid control. Since plywood itself may have slight warping or uneven thickness, this constant-pressure sanding method, lacking adaptive adjustment, easily leads to two undesirable consequences: over-sanding in the raised areas of the board, causing uneven board thickness or even sanding through; and under-sanding in the recessed areas, leaving untreated burrs. This not only affects the consistency of sanding quality but also reduces the yield rate.

[0004] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a plywood sanding device.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a plywood sanding device that can solve the problem that the above-mentioned plywood sanding equipment is prone to over-sanding or under-sanding due to the unevenness of the plywood itself.

[0007] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution: A plywood sanding device includes a conveyor table, a sanding mechanism, and a buffer mechanism. A support is connected to the conveyor table. The sanding mechanism includes a drive cylinder, a fixed plate, a floating plate, and a sanding roller. The drive cylinder is connected to the support, the fixed plate is connected to the free end of the drive cylinder, the floating plate is located below the fixed plate, and the sanding roller is rotatably connected to the lower end face of the floating plate. The buffer mechanism includes multiple buffer rods and multiple springs. The buffer rods are connected between the fixed plate and the floating plate, and the springs are located outside the buffer rods. Under the action of the buffer rods and springs, the sanding roller can always maintain contact with the plywood surface.

[0008] In one or more embodiments of the present invention, a pair of mounting seats are fixedly connected to the lower end face of the floating plate, and the grinding roller is rotatably connected between the pair of mounting seats.

[0009] In one or more embodiments of the present invention, a drive motor is connected to one of the mounting bases, and the grinding roller is connected to the output end of the drive motor.

[0010] In one or more embodiments of the present invention, the number of buffer rods is four, and the four buffer rods are respectively disposed at the four corners of the floating plate.

[0011] In one or more embodiments of the present invention, the fixed plate is further provided with a pressure sensor, the detection end of the pressure sensor is connected to the spring and used to detect the compression of the spring, and the pressure sensor is electrically connected to the control valve of the drive cylinder.

[0012] In one or more embodiments of the present invention, the polishing mechanism is further connected to an adsorption mechanism, which includes a pair of adsorption tubes, an air extraction tube, a negative pressure pump, and a filter box. The pair of adsorption tubes are connected to the lower side of the floating plate and symmetrically arranged on both sides of the polishing roller, with a connecting pipe connecting the pair of adsorption tubes. The air extraction tube is connected to the connecting pipe. The negative pressure pump is mounted on the fixed plate and connected to the air extraction tube. The filter box is mounted on the fixed plate and connected to the air extraction tube.

[0013] In one or more embodiments of the present invention, a pair of baffles are also connected to the lower side of the floating plate, the baffles wrap around the adsorption tube, and a flexible sealing curtain is provided at the bottom of the baffles.

[0014] In one or more embodiments of the present invention, a hollow platform is connected to the bottom of the fixed plate, the hollow platform is connected to the air extraction pipe through a pipeline, and a plurality of pulling cylinders are also connected between the fixed plate and the floating plate. The pulling cylinders correspond to the buffer rods, and a negative pressure pipe is connected between the hollow platform and the pulling cylinders.

[0015] In one or more embodiments of the present invention, a first solenoid valve is installed on the negative pressure pipe, and the pressure sensor is electrically connected to the first solenoid valve.

[0016] In one or more embodiments of the present invention, a spraying mechanism is connected to the side wall of one of the baffles. The spraying mechanism includes a storage tank, a spraying pipe, and a delivery pipe. The storage tank contains a spraying liquid and a pump, with the pump located within the spraying liquid. The spraying pipe is connected to the baffle and positioned below the adsorption pipe. Multiple evenly distributed nozzles are connected to the spraying pipe, facing downwards from the grinding roller. Each nozzle is equipped with a second solenoid valve, and a pressure sensor is electrically connected to the second solenoid valve. One end of the delivery pipe is connected to the output of the pump, and the other end passes through the baffle and is connected to the spraying pipe.

[0017] Compared with the prior art, the plywood sanding device of the present invention, through the setting of the adaptive buffer component, enables the sanding roller to always keep in contact with the surface of the plywood when sanding, effectively avoiding uneven sanding or damage to the plywood caused by warping and deformation, thereby improving the consistency of sanding quality and yield. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of a plywood sanding device according to an embodiment of the present invention; Figure 2 This is a first-angle perspective view of the grinding mechanism in one embodiment of the present invention; Figure 3 This is a front view of the grinding mechanism in one embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle; Figure 5 This is a second perspective view of the grinding mechanism in one embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the structure at point B; Figure 7 This is a side cross-sectional view of the grinding mechanism in one embodiment of the present invention; Figure 8 for Figure 7 Schematic diagram of the structure at point C.

[0020] Explanation of key figure labels: 1-Conveying table, 101-Support, 2-Grinding mechanism, 201-Drive cylinder, 202-Fixed plate, 203-Floating plate, 2031-Mounting base, 204-Grinding roller, 205-Drive motor, 3-Buffer mechanism, 301-Buffer rod, 302-Spring, 303-Hollow platform, 304-Pull cylinder, 305-Negative pressure pipe, 4-Adsorption mechanism, 401-Adsorption pipe, 402-Connecting pipe, 403-Extraction pipe, 404-Negative pressure pump, 405-Filter box, 406-Baffle, 4061-Flexible sealing curtain, 5-Spraying mechanism, 501-Storage box, 502-Spraying liquid, 503-Liquid pump, 504-Spraying pipe, 5041-Spray nozzle, 505-Conveying pipe. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0022] like Figures 1 to 8 As shown, a plywood sanding device according to one embodiment of the present invention includes a conveyor table 1, a sanding mechanism 2, a buffer mechanism 3, an adsorption mechanism 4, and a spraying mechanism 5.

[0023] The conveyor table 1 is used to convey the plywood to be polished. A bracket 101 is connected to the conveyor table 1 to support and install the polishing mechanism 2 and other related components.

[0024] like Figures 1 to 8 As shown, the sanding mechanism 2 includes a drive cylinder 201, a fixed plate 202, a floating plate 203, a sanding roller 204, and a drive motor 205. The drive cylinder 201 is fixedly connected to the bracket 101, and its free end extends downward and is connected to the fixed plate 202. The floating plate 203 is disposed below the fixed plate 202, and the floating plate 203 can float relative to the fixed plate 202 within a certain range. The sanding roller 204 is rotatably connected to the lower end face of the floating plate 203 and is used to sand the surface of the plywood.

[0025] Specifically, a pair of mounting seats 2031 are fixedly connected to the lower end face of the floating plate 203, and the grinding roller 204 is rotatably connected between the pair of mounting seats 2031 via bearings. A drive motor 205 is fixedly mounted on one of the mounting seats 2031, and the output shaft of the drive motor 205 is fixedly connected to one end of the grinding roller 204 for driving the grinding roller 204 to rotate.

[0026] like Figures 2 to 8 As shown, the buffer mechanism 3 includes multiple buffer rods 301 and multiple springs 302. The buffer rods 301 are connected between the fixed plate 202 and the floating plate 203, guiding the floating direction of the floating plate 203 and providing damping. The springs 302 are sleeved on the outside of the buffer rods 301 and are always in a compressed state, providing a downward elastic force to the floating plate 203. Under the action of the springs 302, the grinding roller 204 can always remain in contact with the plywood surface.

[0027] In this embodiment, there are four buffer rods 301, which are respectively located at the four corners of the floating plate 203 to ensure that the floating plate 203 is subjected to uniform force and floats smoothly.

[0028] In addition, to achieve precise control of the grinding pressure, a pressure sensor is also provided on the fixed plate 202. The detection end of the pressure sensor is connected to the spring 302 to detect the compression of the spring 302 in real time. The pressure sensor is also electrically connected to the control valve of the drive cylinder 201.

[0029] When the pressure sensor detects that the compression of spring 302 exceeds a preset threshold, i.e., when the pressure of the grinding roller 204 on the plywood is too high, the pressure sensor sends a signal to the control valve of the drive cylinder 201, causing the drive cylinder 201 to contract and reduce the downward pressure. Conversely, when the compression is below the preset threshold, the drive cylinder 201 extends and increases the downward pressure, thereby controlling the grinding pressure.

[0030] like Figures 1 to 8 As shown, in order to adsorb the dust generated during the polishing process, the polishing mechanism 2 is also connected to an adsorption mechanism 4. The adsorption mechanism 4 includes a pair of adsorption tubes 401, a connecting tube 402, an air extraction tube 403, a negative pressure pump 404, and a filter box 405.

[0031] A pair of adsorption tubes 401 are connected to the lower side of the floating plate 203 and symmetrically arranged on both sides of the grinding roller 204 to form adsorption areas on the front and rear sides of the grinding roller 204. The pair of adsorption tubes 401 are connected to each other by a connecting pipe 402. One end of the suction pipe 403 is connected to the connecting pipe 402, and the other end is connected to the air inlet of the negative pressure pump 404. The negative pressure pump 404 is mounted on the fixed plate 202 and is used to generate negative pressure.

[0032] In addition, the filter box 405 is also located on the fixed plate 202 and connected to the suction pipe 403, for filtering and collecting the inhaled dust and preventing the dust from entering the negative pressure pump 404.

[0033] During operation, the negative pressure pump 404 starts and generates negative pressure near the grinding area through the adsorption tube 401, which draws in the dust generated during grinding and collects it in the filter box 405.

[0034] Specifically, to prevent dust from scattering, a pair of baffles 406 are connected to the lower side of the floating plate 203. The baffles 406 wrap around the outside of the adsorption tube 401, serving to shield and gather the dust. A flexible sealing curtain 4061 is provided at the bottom of the baffles 406. The flexible sealing curtain 4061 makes slight contact with the surface of the plywood to form a semi-sealed space, thereby improving the adsorption efficiency.

[0035] In this embodiment, the filter box 405 is a sealed metal box, which contains multiple filter screens with different mesh ratios for filtering dust.

[0036] like Figures 2 to 8 As shown, in order to address the severe unevenness of the plywood and achieve more precise pressure adjustment, a hollow platform 303 is connected to the bottom of the fixing plate 202. The hollow platform 303 is connected to the air extraction pipe 403 through a pipeline to introduce negative pressure.

[0037] Multiple pull cylinders 304 are connected between the fixed plate 202 and the floating plate 203. The number of pull cylinders 304 corresponds to the number of buffer rods 301, and the movable end of the pull cylinder 304 is fixedly connected to the floating plate 203. A negative pressure pipe 305 is connected between the hollow platform 303 and the pull cylinder 304. The negative pressure pipe 305 is used to introduce the negative pressure in the hollow platform 303 into the pull cylinder 304.

[0038] Specifically, a first solenoid valve is installed on the negative pressure pipe 305, and the pressure sensor is electrically connected to the first solenoid valve.

[0039] When the pressure sensor detects an abnormal compression of the local spring 302 (e.g., excessive compression, indicating a protrusion at that location), it controls the corresponding first solenoid valve to open, causing negative pressure to act on the corresponding pull cylinder 304. The pull cylinder 304 contracts, applying an upward pulling force to the corresponding angle of the floating plate 203, thereby reducing the pressure on the grinding roller 204 in that local area and preventing over-grinding.

[0040] like Figures 1 to 8 As shown, a spraying mechanism 5 is connected to the side wall of one of the baffles 406 to spray a lubricating or anti-stick coating onto the plywood surface before sanding to reduce sanding resistance and dust adhesion.

[0041] The spraying mechanism 5 includes a storage tank 501, a spraying pipe 504, and a delivery pipe 505. The storage tank 501 contains a spraying liquid 502 and a pump 503, with the pump 503 immersed in the spraying liquid 502. The spraying pipe 504 is connected to a baffle 406 and is located below the adsorption pipe 401, facing the area to be polished by the polishing roller 204.

[0042] Preferably, the spray liquid 502 is a low-viscosity UV-curable acrylic varnish or a water-based putty filler.

[0043] In addition, multiple evenly distributed nozzles 5041 are connected to the spray pipe 504, with the nozzles 5041 facing the lower side of the grinding roller 204. Each nozzle 5041 is equipped with a second solenoid valve, and a pressure sensor is electrically connected to the second solenoid valve.

[0044] Specifically, one end of the delivery pipe 505 is connected to the output end of the liquid pump 503, and the other end passes through the baffle 406 and is connected to the spray pipe 504.

[0045] During operation, the pump 503 draws the spraying liquid 502 from the storage tank 501, delivers it through the delivery pipe 505 to the spraying pipe 504, and sprays it onto the plywood surface through the nozzle 5041. The pressure sensor controls the opening and closing of the second solenoid valve at the corresponding position based on the detected compression of the spring 302, for example, increasing the spray volume in areas of higher pressure to enhance lubrication and anti-sticking effects.

[0046] In practical use, the plywood to be sanded is conveyed to the sanding mechanism 2 via the conveyor table 1. Subsequently, the drive cylinder 201 drives the fixed plate 202 to move downward according to the preset initial pressure, so that the sanding roller 204 contacts the surface of the plywood. The drive motor 205 starts, driving the sanding roller 204 to rotate, and begins to sand the surface of the plywood.

[0047] During the sanding process, the floating plate 203 and the fixed plate 202 achieve adaptive floating through the buffer mechanism 3. Specifically, four buffer rods 301 provide vertical guidance for the floating plate 203, while the springs 302 sleeved on the outside of the buffer rods 301 are always in a compressed state, continuously applying a downward elastic force to the floating plate 203, so that the sanding roller 204 can closely fit the plywood surface. Even if the board has slight warping or uneven thickness, the sanding roller 204 can float up and down with the floating plate 203, always maintaining contact and avoiding suspension or excessive downward pressure.

[0048] In addition, during the grinding process, the pressure sensor installed on the fixed plate 202 can detect the compression of each spring 302 in real time and transmit the signal to the control valve of the drive cylinder 201. When the compression of a certain spring 302 exceeds the preset upper limit, it indicates that the plywood protrusion at that point is causing excessive pressure. The control valve then instructs the drive cylinder 201 to slightly contract, reducing the overall downward pressure. Conversely, when the compression is below the preset lower limit, it indicates that the depression at that point is causing insufficient pressure. The drive cylinder 201 then extends, increasing the downward pressure. This achieves macroscopic adjustment of the grinding pressure, ensuring uniform grinding.

[0049] Furthermore, when the pressure sensor detects an abnormal compression of the spring 302 at a certain corner, such as being significantly greater than at other locations, it immediately opens the first solenoid valve on the corresponding negative pressure pipe 305. At this time, the negative pressure generated by the negative pressure pump 404 is transmitted to the corresponding pull cylinder 304 through the suction pipe 403, the hollow platform 303, and the negative pressure pipe 305, causing the pull cylinder 304 to contract and apply an upward pulling force to the corresponding corner of the floating plate 203. This reduces the pressure of the local grinding roller 204 on the plywood, preventing the board from being worn through due to excessive pressure. When the compression returns to normal, the first solenoid valve closes, the pull cylinder 304 resets, and the local pressure returns to normal.

[0050] Dust generated during the grinding process is collected synchronously by the adsorption mechanism 4. The negative pressure pump 404 operates continuously, creating negative pressure within a pair of adsorption tubes 401 through the suction pipe 403 and connecting pipe 402. The adsorption tubes 401 are symmetrically arranged on both sides of the grinding roller 204 and are wrapped by baffles 406. The flexible sealing curtain 4061 at the bottom of the baffles 406 makes slight contact with the plywood surface, forming a semi-enclosed space that effectively draws the flying dust into the adsorption tubes 401. The dust is then collected in the filter box 405 via the connecting pipe 402 and suction pipe 403, achieving centralized dust collection and maintaining a clean working environment.

[0051] In addition, the spraying mechanism 5 pre-treats the plywood surface before sanding. The pump 503 extracts the spraying liquid 502 from the storage tank 501, delivers it through the delivery pipe 505 to the spraying pipe 504, and then evenly sprays it onto the area to be sanded by the sanding roller 204 using multiple nozzles 5041. The second solenoid valve installed on the nozzle 5041 is also controlled by a pressure sensor: when the pressure sensor detects a large compression of the spring 302 at a certain point, indicating high sanding pressure and potential for high temperatures and adhesion, it opens the corresponding second solenoid valve, increasing the spraying volume in that area to enhance lubrication and anti-sticking effects, reduce sanding resistance, and improve surface quality. When the pressure returns to normal, the second solenoid valve closes, and the spraying volume decreases accordingly, achieving on-demand spraying and saving spraying liquid 502.

[0052] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. 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 embodiments that can be understood by those skilled in the art.

Claims

1. A plywood sanding device, characterized in that, include: A conveyor table, on which a support frame is connected; A grinding mechanism includes a drive cylinder, a fixed plate, a floating plate, and a grinding roller. The drive cylinder is connected to the bracket, the fixed plate is connected to the free end of the drive cylinder, the floating plate is located below the fixed plate, and the grinding roller is rotatably connected to the lower end face of the floating plate. The buffer mechanism includes multiple buffer rods and multiple springs. The buffer rods are connected between the fixed plate and the floating plate, and the springs are located on the outside of the buffer rods. Under the action of the buffer rods and springs, the grinding roller can always be in contact with the plywood surface.

2. The plywood sanding device according to claim 1, characterized in that, A pair of mounting seats are fixedly connected to the lower end face of the floating plate, and the grinding roller is rotatably connected between the pair of mounting seats.

3. The plywood sanding device according to claim 2, characterized in that, One of the mounting bases is connected to a drive motor, and the grinding roller is connected to the output end of the drive motor.

4. The plywood sanding device according to claim 1, characterized in that, The number of buffer rods is four, and the four buffer rods are respectively located at the four corners of the floating plate.

5. The plywood sanding device according to claim 1, characterized in that, The fixed plate is also equipped with a pressure sensor. The detection end of the pressure sensor is connected to the spring and is used to detect the compression of the spring. The pressure sensor is electrically connected to the control valve of the drive cylinder.

6. The plywood sanding device according to claim 5, characterized in that, The polishing mechanism is also connected to an adsorption mechanism, which includes: A pair of adsorption tubes are connected to the lower side of the floating plate and are symmetrically arranged on both sides of the grinding roller, and a connecting tube is connected between the pair of adsorption tubes; An air extraction pipe is connected to the connecting pipe; A negative pressure pump is mounted on the fixed plate and connected to the suction pipe; The filter box is mounted on the fixed plate and connected to the air extraction pipe.

7. A plywood sanding device according to claim 6, characterized in that, A pair of baffles are also connected to the lower side of the floating plate. The baffles wrap around the adsorption tube, and a flexible sealing curtain is provided at the bottom of the baffles.

8. A plywood sanding device according to claim 7, characterized in that, A hollow platform is connected to the bottom of the fixed plate. The hollow platform is connected to the air extraction pipe through a pipeline. Multiple pulling cylinders are also connected between the fixed plate and the floating plate. The pulling cylinders correspond to the buffer rods. A negative pressure pipe is connected between the hollow platform and the pulling cylinders.

9. A plywood sanding device according to claim 8, characterized in that, A first solenoid valve is installed on the negative pressure pipe, and the pressure sensor is electrically connected to the first solenoid valve.

10. A plywood sanding device according to claim 9, characterized in that, One of the baffle sidewalls is connected to a spraying mechanism, the spraying mechanism comprising: A storage tank, wherein the storage tank is equipped with a spraying liquid and a pump, the pump being located inside the spraying liquid; A spray pipe is connected to the baffle and located below the adsorption pipe. Multiple evenly distributed nozzles are connected to the spray pipe, with the nozzles facing the lower side of the grinding roller. Each nozzle is equipped with a second solenoid valve, and the pressure sensor is electrically connected to the second solenoid valve. The delivery pipe has one end connected to the output end of the liquid pump, and the other end passes through the baffle and is connected to the spraying pipe.

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