An automatic sander for MDF boards

Abstract

This invention relates to the field of MDF processing technology, specifically disclosing an automatic MDF sanding machine, including a chassis, a board conveying device, and a control cabinet. The chassis houses a self-cleaning sanding mechanism, which includes a sanding belt, a drive roller, driven rollers, and a immersion tank. The drive roller is rotatably positioned above the board conveying device, and the immersion tank is fixedly positioned in the chassis above the drive roller. Two immersion rollers are rotatably positioned in the immersion tank. The sanding belt is wound between the drive roller, the two driven rollers, and the two immersion rollers. A cleaning brush is positioned above the two immersion rollers, and a drive assembly is provided on the immersion tank to reciprocate the cleaning brush. This invention employs a newly designed self-cleaning sanding mechanism, which not only effectively cleans dust and impurities adhering to the working surface of the sanding belt, but also achieves rapid cooling of the sanding belt due to its immersion in the cleaning solution. The entire self-cleaning sanding mechanism features a novel structural design and excellent sanding effect on MDF.

Description

Technical Field

[0001] This invention relates to the field of MDF processing technology, and specifically discloses an automatic sanding machine for MDF. Background Technology

[0002] Medium-density fiberboard (MDF) is a type of board made primarily from wood fibers, mixed with adhesives such as resin, and then pressed under heat and pressure. To improve the surface quality of MDF during processing, the surface of the MDF blank needs to be sanded, and this sanding process requires the use of a sanding machine.

[0003] Utility model patent application number 2017207196549 discloses a sanding device for high-density fiberboard (HDF), including a conveyor, a thickness sander, and a dust collector. The thickness sander is installed on one side of the conveyor, and the dust collector is installed on the other side. A tensioning roller assembly is located at the top inside the thickness sander, and an adjuster is installed below the tensioning roller assembly. A tensioning mechanism assembly is connected below the adjuster. This HDF sanding device has some shortcomings when performing long-term sanding treatment on the surface of HDF. Firstly, prolonged sanding of MDF surfaces with a sanding belt causes the temperature to rise. Since MDF is made of resin and wood fibers pressed together, the high temperature softens the resin on the surface, causing it to adhere to the sanding belt. Existing sanders only use cleaning rollers inside the machine to clean the sanding belt surface, but the adhered resin is difficult to remove completely, thus affecting the subsequent sanding effect. Secondly, after sanding, a large amount of dust remains on the surface of the MDF. Existing sanders only use negative pressure adsorption devices inside to treat this dust, but negative pressure adsorption alone is insufficient to completely remove the dust from the MDF surface. Thirdly, existing sanders directly feed the MDF under the sanding belt during sanding. If there are bumps or hard foreign objects on the MDF surface, the sanding belt is easily damaged. Therefore, to address the above-mentioned shortcomings of existing sanders for MDF processing, this application proposes an automatic MDF sander that effectively solves the aforementioned technical problems. Summary of the Invention

[0004] The present invention aims to provide an automatic sanding machine for high-density fiberboard (HDF) to address the shortcomings of existing HDF sanding devices as mentioned in the background art.

[0005] This invention is achieved through the following technical solution:

[0006] An automatic sanding machine for MDF includes a chassis, a board conveying device, and a control cabinet. The board conveying device extends through the interior of the chassis. Inside the chassis, a self-cleaning sanding mechanism is located directly above the board conveying device. The self-cleaning sanding mechanism includes a sanding belt, a drive roller, driven rollers, and a immersion tank. The drive roller is rotatably positioned above the board conveying device. The immersion tank is fixedly positioned in the chassis above the drive roller. Two driven rollers are rotatably positioned at the left and right ends of the immersion tank, respectively. Two immersion rollers are rotatably positioned in the immersion tank. The sanding belt is wound between the drive roller, the two driven rollers, and the two immersion rollers. A cleaning brush is positioned above the two immersion rollers to clean the working surface of the sanding belt. A drive assembly is provided on the immersion tank to enable the cleaning brush to reciprocate perpendicular to the traction direction of the sanding belt. A sponge moisture-absorbing roller that contacts the inner surface of the sanding belt is rotatably positioned in the chassis between the drive roller and the immersion tank.

[0007] As a further provision of the above solution, the drive assembly includes a rectangular frame disposed in the upper opening of the immersion tank. Guide components are disposed between the front and rear ends of the rectangular frame and the immersion tank, and a cleaning brush is connected to the lower end of the rectangular frame. Bearing seats and a cleaning motor are respectively disposed at the left and right ends of the immersion tank. A rotating shaft is connected between the bearing seats and the cleaning motor. An incomplete gear is disposed on the rotating shaft and located in the rectangular frame. The upper and lower ends of the inner ring of the rectangular frame are provided with tooth surfaces that mesh with the incomplete gear.

[0008] As a further feature of the above solution, the guiding assembly includes guide rods fixedly connected to the front and rear ends of the rectangular frame, and guide cylinders that are inserted into the guide rods are provided at the front and rear ends of the immersion tank.

[0009] As a further provision of the above solution, a squeezing roller that abuts against the sponge moisture-absorbing roller is rotatably installed in the casing, and a water receiving trough is fixedly installed below the squeezing roller.

[0010] As a further feature of the above solution, both ends of the immersion tank are connected to end shells aligned with the cleaning brush, the lower end of the immersion tank is connected to a drain pipe extending out of the chassis, and an injection pipe is provided on the end shell extending out of the chassis.

[0011] The automatic sanding machine for MDF disclosed in this invention sands the surface of MDF. The sanding belt enters the immersion tank under the transmission action of the drive roller, and the working surface of the sanding belt is immersed in the cleaning solution due to the action of the two immersion rollers. During the traction transmission of the sanding belt in the immersion tank, the drive assembly drives the cleaning brush to move back and forth perpendicular to the traction direction of the sanding belt. During this reciprocating movement, the brush bristles remove all dust and impurities from the working surface of the sanding belt, which then flow into the immersion tank. Simultaneously, the sanding belt rapidly cools down due to the cleaning solution.

[0012] After the sanding belt is pulled out of the immersion tank, its inner surface comes into contact with the moisture-absorbing sponge roller. The sponge roller absorbs and removes all the moisture from the inner surface of the sanding belt, preventing water from contacting the drive roller. Finally, when the sanding belt is pulled onto the drive roller, only its working surface will retain moisture. The presence of this moisture reduces the temperature rise during the sanding process and also reduces the dust generated during sanding.

[0013] As a further provision of the above scheme, a board cleaning and dust removal mechanism is provided in the chassis located downstream of the self-cleaning sanding mechanism. The board cleaning and dust removal mechanism includes a dust collection cylinder, a filter box, and a negative pressure suction device. The lower opening of the dust collection cylinder faces the board conveying device. A brush roller is rotatably installed in the dust collection cylinder. A dust collection channel is provided at the upper end of the dust collection cylinder. The end of the dust collection channel is connected to a dust collection pipe that extends out of the chassis and connects to the filter box. The negative pressure suction device is connected to the filter box through a pipe.

[0014] The aforementioned board cleaning and dust removal mechanism, after the MDF surface is sanded and moved to the position of the dust collection cylinder, sweeps the dust on its surface into the upper end of the dust collection cylinder through a high-speed rotating brush roller. Then, under the action of negative pressure suction, all the swept dust is drawn into the filter box and filtered through the filter bag. Finally, the filtered air is discharged by the negative pressure air extraction device, which achieves efficient cleaning of dust and impurities on the surface of the MDF.

[0015] As a further feature of the above scheme, a vertically downward measuring light curtain is fixed on the chassis at the feeding end of the sheet material conveying device, and a sanding roller processing device is provided in the chassis upstream of the self-cleaning sanding mechanism.

[0016] As a further provision of the above scheme, the sanding roller processing device includes a U-shaped frame and a telescopic drive component. A sanding roller is rotatably arranged in the U-shaped frame, and a sanding motor is connected to the end of the sanding roller. The lower end of the telescopic drive component is connected to the U-shaped frame. The ranging light curtain, the sanding motor, and the telescopic drive component are all electrically connected to the control cabinet.

[0017] The structural design of the aforementioned distance measuring light curtain and sanding roller processing device allows the distance measuring light curtain to first detect the flatness of the entire MDF surface during the operation of the sander. Once a bump or foreign object is detected on the MDF surface, the control cabinet will send a control signal to activate the sanding motor and telescopic drive. Under the action of the telescopic drive, the U-shaped frame is slowly pushed downwards. Then, the bump or foreign object is removed by the action of the high-speed rotating sanding roller on the MDF surface, avoiding the problem of easy damage to the sanding belt caused by subsequent direct processing with the sanding belt.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The automatic sanding machine for MDF disclosed in this invention uses an immersion tank, immersion rollers, cleaning brushes, and drive components to clean the surface of the sanding belt after sanding. It can not only effectively clean the dust and impurities attached to the working surface of the sanding belt, but also achieve rapid cooling of the sanding belt by immersing it in the cleaning solution. At the same time, when the sanding belt comes into contact with MDF again after immersion cleaning, the residual moisture on the surface can achieve cooling and dust reduction during the sanding process. The entire self-cleaning sanding mechanism has a novel structural design and excellent sanding effect on MDF.

[0020] The automatic sanding machine for MDF disclosed in this invention is further equipped with a board cleaning and dust removal mechanism consisting of a dust collection cylinder, a brush roller, a filter box, and a negative pressure suction device to clean the surface of the sanded MDF. The high-speed rotating brush roller can ensure that the surface of the MDF is clean, and at the same time, the negative pressure adsorption can filter the dust and impurities swept into the dust collection cylinder, which has a good environmental protection effect.

[0021] The automatic sanding machine for MDF disclosed in this invention can also detect the surface flatness of MDF before sanding. Once a bump or foreign object is found on the surface of the sealing board, the sanding roller treatment device will be activated to pre-treat the surface of the MDF to remove the bump or foreign object. This effectively avoids the problem of sanding belts being easily damaged due to the direct use of sanding belts in existing sanding machines, and greatly improves the service life of the sanding belts. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a frontal perspective view of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the back of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal planar structure of the present invention;

[0026] Figure 4 This is a three-dimensional structural diagram of the self-cleaning sanding mechanism in this invention;

[0027] Figure 5 This is a schematic diagram of the internal planar structure of the self-cleaning sanding mechanism in this invention;

[0028] Figure 6 This is a three-dimensional structural diagram of the plate cleaning and dust removal mechanism in this invention;

[0029] Figure 7 This is a three-dimensional structural diagram of the sand roller processing device in this invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-7 This application will be described in detail with reference to the embodiments. Example 1

[0032] Example 1 discloses an automatic sanding machine for MDF (medium density board), see attached drawing. Figure 1 and attached Figure 1 The main body of the sander includes a casing 1. A control cabinet 2 is installed on the front side of the casing 1. The control cabinet 2 integrates a corresponding control module that can control the operation of the entire sander. A conveyor seat 3 is arranged through the casing 1 from left to right, and a conveyor belt 4 is installed in the conveyor seat 3. To prevent the conveyor belt 4 from slipping when conveying the MDF for sanding, corresponding anti-slip textures are also provided on the outer surface of the conveyor belt 4 (not shown in the figure).

[0033] Reference Appendix Figure 3 Appendix Figure 4 and attached Figure 5 Inside the housing 1, a self-cleaning sanding mechanism 5 is installed above the conveyor belt 4. The self-cleaning sanding mechanism 5 includes a sanding belt 501, a drive roller 502, a driven roller 503, and a washing tank 504. The drive roller 502 is positioned 3-20mm above the conveyor belt 4, and a sanding drive device 505 is connected to one end of it. The specific distance between the drive roller 502 and the conveyor belt 4 is determined by the thickness of the MDF to be sanded.

[0034] The immersion tank 504 is fixedly installed directly above the drive roller 502, and then two driven rollers 503 are rotatably installed on the upper ends of the left and right sides of the immersion tank 504. Two immersion rollers 506 are provided at the lower end of the inner cavity of the immersion tank 504, and strip-shaped openings 5041 for passing through the sanding belt 501 are provided at the upper ends of the left and right sides of the immersion tank 504. The sanding belt 501 is then wound between the drive roller 502, the two driven rollers 503 and the two immersion rollers 506, so that the upper end of the sanding belt 501 is immersed in the cleaning solution in the immersion tank 504, and the sanding working surface of the sanding belt 501 is set upwards.

[0035] A rectangular frame 507, perpendicular to the transmission direction of the sanding belt 501, is provided in the upper opening of the immersion tank 504. A cleaning brush 508, extending into the immersion tank 504, is connected to the lower end of the rectangular frame 507. The cleaning brush 508 is located between two immersion rollers 506, and its lower surface is provided with bristles that contact the sanding working surface of the sanding belt 501. Guide rods 509 are connected to both the front and rear ends of the rectangular frame 507, and guide cylinders 510, which are inserted into the guide rods 509, are provided in the immersion tank 504. Bearing seats 511 and cleaning motors 512 are respectively provided at the left and right ends of the upper opening of the immersion tank 504. A rotating shaft 513 passing through the rectangular frame 507 is provided between the bearing seats 511 and the cleaning motor 512. An incomplete gear 514 is fixedly connected to the rotating shaft 513. Tooth surfaces that mesh with the incomplete gear 514 are provided at the upper and lower ends of the inner ring of the rectangular frame 507. The aforementioned cleaning motor 512 serves as the power input source, causing the incomplete gear 514 to rotate within the rectangular frame 507. The incomplete gear 514 then meshes with the tooth surfaces at the upper and lower ends of the rectangular frame 507, causing the rectangular frame 507 to move back and forth. The action of the rectangular frame 507 causes the cleaning brush 508 to also move back and forth in the immersion tank 504. The bristles on the cleaning brush 508 then clean the sanding surface of the sanding belt 501 between the two immersion rollers 506. This not only effectively removes impurities adhering to the sanding belt 501, but also cools the sanding belt 501 in real time due to the water cooling effect of the cleaning fluid.

[0036] A sponge absorbent roller 515 is rotatably mounted in the housing 1 between the drive roller 502 and the immersion roller 506, and this sponge absorbent roller 515 contacts the inner surface of the sanding belt 501, so that the sanding belt 501 extending from the immersion tank 504 interacts with the sponge absorbent roller 515, thereby absorbing the moisture remaining on the inner surface of the sanding belt 501. In addition, a water squeezing roller 516 is rotatably mounted in the housing 1 next to the sponge absorbent roller 515, and the roller body of the water squeezing roller 516 abuts against the roller body of the sponge absorbent roller 515. A water receiving trough 517 is provided below the water squeezing roller 516, and a drain pipe 518 extending out of the housing 1 is connected to the side end of the water receiving trough 517. The squeezing action of the water-squeezing roller 516 on the sponge moisture-absorbing roller 515 can squeeze out all the water absorbed by the sponge moisture-absorbing roller 515 and let it fall into the water receiving trough 517, thereby ensuring that the sponge moisture-absorbing roller 515 can always have a good moisture absorption effect on the sand belt 501.

[0037] In this embodiment, end shells 519, aligned with the cleaning brush 508, are also provided on the front and rear end faces of the immersion tank 504. Both end shells 519 are connected to the inner cavity of the immersion tank 504, allowing the cleaning brush 508 to extend into the end shells 519 during its reciprocating motion. The design of the end shells 519 also ensures that the immersion tank 504 is fixed within the housing 1. Finally, a drain pipe 520 extending out of the housing 1 is connected to the lower surface of the immersion tank 504, and a liquid injection pipe 521 is connected to the upper surface of the end shells 519 extending out of the housing 1. Example 2

[0038] Example 2 discloses an automatic sanding machine for MDF that is improved and optimized based on Example 1. The similarities between it and Example 1 will not be described again.

[0039] Reference Appendix Figure 2 Appendix Figure 3 and attached Figure 6 Downstream of the self-cleaning sanding mechanism 5, a board cleaning and dust removal mechanism 6 is installed in the housing 1. This mechanism includes a dust collection cylinder 601 fixed in the housing 1 and a filter box 602 and a negative pressure suction device 603 installed outside the housing 1. The lower end of the dust collection cylinder 601 faces the upper surface of the conveyor belt 4, and a brush roller 604 is rotatably installed inside the dust collection cylinder 601. A brush roller motor 605 is installed at one end of the dust collection cylinder 601. During the rotation of the brush roller 604, the brush bristles can sweep the dust and debris on the surface of the MDF board towards the dust collection cylinder 601.

[0040] A suction channel 606 is provided at the upper end of the suction cylinder 601 along its tangential direction. Then, a suction pipe 607 is connected to the end of the suction channel 606, extending out of the casing 1 and connected to the filter box 602. Then, a negative pressure suction device 603 is connected to the filter box 602 through a pipe. The specific negative pressure suction device 603 can be either a vacuum pump or a negative pressure fan. The filter box 602 is equipped with a corresponding filter bag. Example 3

[0041] Example 3 discloses an automatic sanding machine for MDF that is improved and optimized based on Example 1 or Example 2. The similarities between it and Example 1 or Example 2 will not be described again.

[0042] Reference Appendix Figure 1 Appendix Figure 2 Appendix Figure 3 and attached Figure 7 An installation strip 7 is provided on the left side of the feed end of the chassis 1. A vertically downward-facing ranging light curtain 8 is fixedly installed on the installation strip 7 and electrically connected to the processing module inside the control cabinet 2. When the MDF is being fed, the ranging light curtain 8 can be used to determine whether there are bumps or foreign objects on the surface of the board.

[0043] A sanding roller processing device 9 is installed in the housing 1 upstream of the self-cleaning sanding mechanism 5. This device includes a U-shaped frame 901 housed within the housing 1, with a sanding roller 902 rotatably connected within it. A sanding motor 903 is installed at one end of the sanding roller 902. A telescopic drive component 904, preferably a cylinder, is installed on the housing 1 directly above the U-shaped frame 901. This drive component 904 is extended or retracted under the control of the control cabinet 2. Finally, to ensure stable lifting and lowering of the U-shaped frame 901 and the sanding roller 902, a vertical guide rod 905 is installed on the U-shaped frame 901, and a sliding hole matching the vertical guide rod 905 is provided at the upper end of the housing 1.

[0044] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A density board automatic sander, comprising a machine case, a board conveying device and a control cabinet, the board conveying device is arranged through the inside of the machine case left and right, characterized in that, The inside of the cabinet is provided with a self-cleaning sanding mechanism above the plate conveying device, the self-cleaning sanding mechanism comprises a sand belt, a driving roller, a driven roller and an immersion tank, the driving roller is rotationally arranged above the plate conveying device, the immersion tank is fixedly arranged in the cabinet above the driving roller, two driven rollers are rotationally arranged at the left and right ends of the immersion tank respectively, two immersion rollers are rotationally arranged in the immersion tank, the sand belt is wound between the driving roller, the two driven rollers and the two immersion rollers, a cleaning brush for cleaning the working surface of the sand belt is arranged above the two immersion rollers, a driving assembly for realizing the reciprocating movement of the cleaning brush perpendicular to the traction direction of the sand belt is arranged on the immersion tank, and a sponge moisture absorption roller in contact with the inner surface of the sand belt is rotationally arranged in the cabinet between the driving roller and the immersion tank.

2. The density board automatic sander according to claim 1, wherein, The driving assembly comprises a rectangular frame arranged in the opening of the upper end of the immersion tank, guide assemblies are arranged between the front and rear ends of the rectangular frame and the immersion tank, the cleaning brush is connected to the lower end of the rectangular frame, bearing seats and cleaning motors are arranged at the left and right ends of the immersion tank respectively, a rotating shaft is connected between the bearing seat and the cleaning motor, an incomplete gear is arranged on the rotating shaft and located in the rectangular frame, and tooth surfaces meshing with the incomplete gear are arranged at the upper and lower ends of the inner ring of the rectangular frame.

3. The density board automatic sander of claim 2, wherein, The guide assembly comprises guide rods fixedly connected to the front and rear ends of the rectangular frame, and guide cylinders are arranged at the front and rear ends of the immersion tank and inserted with the guide rods.

4. The density board automatic sander of claim 1, wherein, A wringing roller abutting against the sponge moisture absorption roller is rotationally arranged in the cabinet, and a water receiving groove is fixedly arranged below the wringing roller.

5. The density board automatic sander of claim 1, wherein, End housings aligned with the cleaning brush are communicatively arranged at the front and rear ends of the immersion tank, a sewage discharge pipe is connected to the lower end of the immersion tank and extends out of the cabinet, and a liquid injection pipe is arranged on the end housing extending out of the cabinet.

6. The density board automatic sander of claim 1, wherein, A plate cleaning and dust removing mechanism is arranged in the cabinet downstream of the self-cleaning sanding mechanism, the plate cleaning and dust removing mechanism comprises a dust suction cylinder, a filter box and a negative pressure air suction device, the lower end opening of the dust suction cylinder faces the plate conveying device, a brush roller is rotationally arranged in the dust suction cylinder, a dust suction channel is arranged at the upper end of the dust suction cylinder, the end of the dust suction channel is connected with a dust suction pipe extending out of the cabinet and connected with the filter box, and the negative pressure air suction device is connected with the filter box through a pipeline.

7. The density board automatic sander of claim 1, wherein, A vertical downward distance measuring light curtain is fixed on the cabinet at the feeding end of the plate conveying device, and a sand roller processing device is arranged in the cabinet upstream of the self-cleaning sanding mechanism.

8. The density board automatic sander of claim 7, wherein, The sand roller processing device comprises a U-shaped frame and an extension driving member, a sanding roller is rotationally arranged in the U-shaped frame, and a sanding motor is connected to the end of the sanding roller, the lower end of the extension driving member is connected with the U-shaped frame, and the distance measuring light curtain, the sanding motor and the extension driving member are electrically connected with the control cabinet.

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