Continuous surface sanding device and sanding process for small plate workpiece

Abstract

The invention relates to the technical field of wood sanding, in particular to a continuous surface sanding device and process for a small plate workpiece. A first sanding part, a second sanding part, a third sanding part and an adjusting assembly are arranged on the mounting platform, the first sanding part is composed of a first lifting roller, a deflection roller and a first sanding belt, the second sanding part is composed of a second sanding belt and a second lifting roller with elasticity, the third sanding part is provided with a sanding disc capable of rotating, and the adjusting assembly is arranged on the first sanding part. The adjusting assembly is in transmission connection with the first lifting roller and the second lifting roller, the deflection roller is connected with the first lifting roller through a connecting plate, a torsional spring and a sleeve are arranged at the position, connected with the first lifting roller, of the connecting plate, and a detection sensor consistent with the sanding disc in height is arranged on the mounting platform. By means of the multi-step sanding step, collapse caused by too large pressure is prevented, and finally the protrusions are flush with the surface of the plate. And the three steps cooperate to effectively protect special parts such as wood knots, so that cracks or collapsing defects are avoided, and the surface treatment quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wood sanding, in particular to a continuous surface sanding device and a sanding process for a small plate workpiece. Background Art

[0002] In the surface sanding process of small plate workpieces, traditional sanding devices have difficulty accurately processing special areas such as wood knots and protrusions on the plate surface. Because the hardness of wood knots is 3-5 times higher than that of the surrounding wood, the rigid sanding can easily cause the knots to collapse or produce radial cracks when the sanding impacts instantly, thus destroying the integrity of the plate. Secondly, the sanding process is single and lacks a staged processing mechanism. It is impossible to grind gradually according to the height of the protrusion, which can easily lead to over-sanding or sand leakage, resulting in poor surface flatness. Thirdly, it cannot flexibly adapt to plates of different thicknesses. The adjustment process is cumbersome. In addition, small plates are light in weight and are easily offset due to sanding pressure during transportation, resulting in sanding position deviation. These problems seriously restrict the quality and efficiency of small plate sanding, making it difficult to meet the needs of high-precision and continuous production. Summary of the Invention

[0003] Based on this, it is necessary to provide a continuous surface sanding device and sanding process for small plate workpieces to address the existing technical problems.

[0004] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: The present invention provides a continuous surface sanding device for small plate workpieces, comprising a conveyor belt and a mounting platform installed thereon, wherein a sanding assembly and an adjusting assembly are provided on the mounting platform, the sanding assembly being provided with a first sanding part, a second sanding part and a third sanding part in sequence along a transmission direction, the first sanding part being composed of a first lifting roller, a deflection roller and a first sanding belt, the second sanding part being composed of a second sanding belt and a second lifting roller with elasticity, the third sanding part being provided with a rotatable sanding disc, the adjusting assembly being transmission-connected to the first lifting roller and the second lifting roller respectively, the deflection roller being located on a side of the first lifting roller close to the second lifting roller, the deflection roller being connected to the first lifting roller by a connecting plate, a torsion spring and a sleeve being provided at a connection between the connecting plate and the first lifting roller, the first lifting roller being connected to the connecting plate through the sleeve, a detection sensor being provided on the mounting platform being height-consistent with the sanding disc, a driving assembly being provided on the mounting platform being transmission-connected to the sanding disc, the sanding disc being transmission-connected to the first sanding belt and the second sanding belt.

[0005] In order to ensure that the first sanding belt and the second sanding belt can still be in a tensioned state when the height and deflection angle change, and to ensure that they are always in a transmission state with the sanding disc during the adjustment process, the first sanding part also includes a first fixed roller and a first tensioning roller, the first sanding belt is sleeved on the first lifting roller, the deflection roller, the first fixed roller and the first tensioning roller, the first fixed roller shaft is connected to the mounting platform, the second sanding part also includes a second fixed roller and a second tensioning roller, the second sanding belt is sleeved on the second lifting roller, the second fixed roller and the second tensioning roller, the second fixed roller shaft is connected to the mounting platform, the first fixed roller is transmission connected to the second fixed roller, and the second fixed roller is transmission connected to the sanding disc.

[0006] In order to limit the deflection roller in the first sanding section when automatically adjusting the angle, prevent the deflection roller from deviating, and ensure that the deflection roller can adapt to the lifting and lowering adjustment state of the first lifting roller, two connecting frames fixedly connected to it are provided on the mounting platform. The two connecting frames are respectively located on both sides of the conveyor belt. A vertical slide groove is vertically opened on the connecting frame, and a first sliding shaft seat is provided in the vertical slide groove. The ends of the first lifting roller and the second lifting roller correspond to the first sliding shaft seat. A horizontal limit plate and an inclined limit plate are also fixedly installed on the first sliding shaft seat at both ends of the first lifting roller. The horizontal limit plate is fixedly installed above the first sliding shaft seat, and the inclined limit plate is fixedly installed below the first sliding shaft seat.

[0007] Preferably, a horizontal slide groove is also provided on the connecting frame, and a second sliding shaft seat is slidingly provided in the horizontal slide groove. The ends of the first tensioning roller and the second tensioning roller are both installed in the corresponding second sliding shaft seat. A spring is also provided in the horizontal slide groove, one end of the spring is fixedly connected to the end of the horizontal slide groove, and the other end of the spring is fixedly connected to the second sliding shaft seat.

[0008] Preferably, the driving assembly includes a rotary driver, a first rotating shaft, a second rotating shaft, a gear set, a first synchronous belt and a second synchronous belt. The first rotating shaft coaxially arranged with the sanding disc is vertically arranged on the mounting platform, the rotary driver is fixedly arranged on the mounting platform and its output end is fixedly connected to the first rotating shaft, the second rotating shaft is horizontally rotated and arranged on one side of the mounting platform, the second rotating shaft is connected to the first rotating shaft through a gear set, the two ends of the first synchronous belt are respectively installed on the second rotating shaft and the second lifting roller, and the two ends of the second synchronous belt are respectively installed on the first lifting roller and the second lifting roller.

[0009] Preferably, the adjustment component includes a first linear drive and a second linear drive vertically arranged on the mounting platform, the first linear drive is connected to the first sliding shaft seat on which the first lifting roller is installed through a first downward push rod, the second linear drive is connected to the first sliding shaft seat on which the second lifting roller is installed through a second downward push rod, and an elastic telescopic rod is installed at the connection between the first sliding shaft seat on which the second lifting roller is installed and the second downward push rod.

[0010] In order to adapt to the sanding operation of small plates of different thicknesses, the installation platform is connected to the conveyor belt through an electric lifting column.

[0011] Preferably, negative pressure adsorption holes are provided on the surface of the conveyor belt.

[0012] In order to prevent burrs, small gaps, cracks, etc. on the bottom surface of small plates from affecting the adsorption effect of the negative pressure adsorption holes, a rubber pad is also provided on the surface of the conveyor belt.

[0013] A continuous surface sanding process for a small plate workpiece is also provided, comprising the following steps: S1: Adjust the height of the installation platform so that the sanding assembly can adapt to the thickness of the small plate. The conveyor belt transports the small plate. When it runs under the installation platform, the sanding assembly installed thereon performs sanding on the surface of the small plate. S2: Detecting whether there are high raised areas or knots on the surface of the small board through a detection sensor. When a location requiring special treatment is detected, the first lifting roller in the first sanding unit is lifted to a certain height so that the height of the first sanding belt at the surface contact area is higher than the height of the wood knot, so that the first sanding belt can be in contact with the raised area for sanding; S3: Drive the second lifting roller to a certain height, which is lower than the height of the first lifting roller, so that it can perform partial sanding operation on the wood knot; S4: The small plate is subjected to the final sanding operation by the sanding disc. After the above process is completed, the conveyor belt drives the small plate to be unloaded.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention divides the sanding process into three stages: the first stage utilizes a deflecting roller and torsion spring to sand the raised edges at an angle, avoiding wood knots while also avoiding direct impact. The second stage utilizes an elastic second lifting roller for flexible sanding, preventing chipping caused by excessive pressure. The third stage utilizes a sanding disc for rigid finishing, ultimately aligning the raised edges with the board surface. These three steps work together to effectively protect specific areas such as wood knots, prevent cracks or chipping, and enhance surface treatment quality.

[0015] 2. The detection sensor identifies protrusions on the board in real time, and the linkage adjustment component adjusts the height of the first and second lifting rollers to accurately match the height of the wood knots with the thickness of the board. The electric lifting column can adjust the overall height of the installation platform to accommodate boards of different thicknesses. The combination of the deflection roller and the torsion spring enables the first sanding belt to automatically conform to the surface of the board, eliminating the need for manual intervention to handle complex surfaces, significantly improving the versatility of the device.

[0016] 3. The negative pressure adsorption holes on the conveyor belt surface work together with the rubber pad to tightly adsorb small plates to prevent them from deflecting due to pressure during transmission or sanding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of a continuous surface sanding device for a small plate workpiece; Figure 2 It is a schematic diagram of the three-dimensional structure of a continuous surface sanding device for small plate workpieces without a conveyor belt; Figure 3 yes Figure 2 Front view of Figure 4 A schematic diagram of the partial three-dimensional structure of a continuous surface sanding device for small plate workpieces Figure 1 ; Figure 5 It is a three-dimensional structural diagram of a driving component in a continuous surface sanding device for a small plate workpiece; Figure 6 It is a schematic diagram of the three-dimensional structure of the first sanding part and the second sanding part in a continuous surface sanding device for a small plate workpiece; Figure 7 It is a schematic diagram of the three-dimensional structure of the first sanding part in a continuous surface sanding device for a small plate workpiece; Figure 8 A schematic diagram of the partial three-dimensional structure of a continuous surface sanding device for small plate workpieces Figure 2 .

[0018] The numbers in the figure are: 1. Conveyor belt; 2. Mounting platform; 3. First sanding section; 4. Second sanding section; 5. Third sanding section; 6. First lifting roller; 7. Deflection roller; 8. First sanding belt; 9. Second lifting roller; 10. Second sanding belt; 11. Sanding disc; 12. Connecting plate; 13. Torsion spring; 14. Sleeve; 15. Detection sensor; 16. First fixed roller; 17. First tensioning roller; 18. Second fixed roller; 19. Second tensioning roller; 20. Connecting frame; 21. Vertical slide; 2 2. First sliding shaft connector; 23. Horizontal limit plate; 24. Inclined limit plate; 25. Horizontal slide; 26. Second sliding shaft connector; 27. Spring; 28. Rotary drive; 29. ​​First rotating shaft; 30. Second rotating shaft; 31. Gear set; 32. First synchronous belt; 33. Second synchronous belt; 34. First linear drive; 35. Second linear drive; 36. First downward push rod; 37. Second downward push rod; 38. Negative pressure adsorption hole; 39. Electric lifting column. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1-8 The device for continuously sanding the surface of a small plate workpiece shown in the figure comprises a conveyor belt 1 and a mounting platform 2 mounted thereon, a sanding assembly and an adjustment assembly being provided on the mounting platform 2, the sanding assembly being provided with a first sanding section 3, a second sanding section 4 and a third sanding section 5 in sequence along the transmission direction, the first sanding section 3 being composed of a first lifting roller 6, a deflection roller 7 and a first sanding belt 8, the second sanding section 4 being composed of a second sanding belt 10 and a second lifting roller 9 having elasticity, the third sanding section 5 being provided with a rotatable sanding disc 11, the adjustment assembly being respectively connected to the first lifting roller 6 and the third sanding section 5. The two lifting rollers 9 are transmission connected, the deflection roller 7 is located on the side of the first lifting roller 6 close to the second lifting roller 9, the deflection roller 7 is connected to the first lifting roller 6 through a connecting plate 12, and a torsion spring 13 and a sleeve 14 are provided at the connection between the connecting plate 12 and the first lifting roller 6. The first lifting roller 6 is connected to the connecting plate 12 through the sleeve 14, and a detection sensor 15 with the same height as the sanding disc 11 is provided on the mounting platform 2. A driving assembly transmission-connected to the sanding disc 11 is provided on the mounting platform 2. The sanding disc 11 is transmission-connected to the first sanding belt 8 and the second sanding belt 10.

[0021] The conveyor belt 1 transports the small board. When it reaches the bottom of the mounting platform 2, the sanding components mounted thereon sand the surface of the small board. The first, second, and third sanding sections 3, 4, and 5 operate sequentially along the conveying direction. A detection sensor 15 is used to detect whether there are protrusions or knots on the surface of the small board. When a knot or protrusion is detected on the board, the first lifting roller 6 in the first sanding section 3 is first raised to a certain height so that the first sanding belt 8 at the surface contact point is higher than the knot. The deflection roller 7, under the elastic force of the torsion spring 13, remains in contact with the board surface. The bottom of the first sanding belt 8 then shifts from horizontal to an inclined position. When the knot moves to the first sanding section 3, the first sanding belt 8, with its inclined bottom, sands the edge of the knot. As the pressure of the knot against the first sanding belt 8 increases, the deflection roller 7 gradually deflects upward, thereby avoiding the knot during sanding and preventing it from being sanded all the way through. When entering the second sanding section 4, the second lifting roller 9 is raised to a certain height, which is lower than the height of the first lifting roller 6, so that it can perform partial sanding operations on the wood knots. Since the second lifting roller 9 is elastic, when the sanding pressure is too high, the second lifting roller 9 has the ability to move upward to avoid excessive sanding pressure and the occurrence of chipping. After two elastic sanding operations, the wood knot part is rigidly sanded by the sanding disc 11 on the third sanding section 5. At this time, since the protruding position of the wood knot has been elastically ground many times, the protruding part is smaller and relatively flat, and the final sanding operation can be performed. Finally, the sanding disc 11 is used to sand the protruding part until it is flush with the overall surface of the board. This method can ensure that the knot area will not be chipped or radial cracks will be generated, thereby improving the quality of the board surface after treatment.

[0022] The driving assembly can drive the sanding disc 11 to rotate, and when the sanding disc 11 rotates, the first sanding belt 8 and the second sanding belt 10 are driven to rotate at high speed at the same time, thereby realizing the driving work of the entire sanding assembly.

[0023] like Figure 5-Figure 7As shown, in order to ensure that the first sanding belt 8 and the second sanding belt 10 can still be in a tensioned state when the height and deflection angle change, and it is necessary to ensure that they are always in a transmission state with the sanding disc 11 during the adjustment process, the first sanding part 3 also includes a first fixed roller 16 and a first tensioning roller 17, the first sanding belt 8 is sleeved on the first lifting roller 6, the deflection roller 7, the first fixed roller 16 and the first tensioning roller 17, the first fixed roller 16 is axially connected to the mounting platform 2, the second sanding part 4 also includes a second fixed roller 18 and a second tensioning roller 19, the second sanding belt 10 is sleeved on the second lifting roller 9, the second fixed roller 18 and the second tensioning roller 19, the second fixed roller 18 is axially connected to the mounting platform 2, the first fixed roller 16 is transmission-connected to the second fixed roller 18, and the second fixed roller 18 is transmission-connected to the sanding disc 11.

[0024] The first tensioning roller 17 and the second tensioning roller 19 are used to automatically adjust the tensioning state of the first sanding belt 8 and the second sanding belt 10 respectively, and the first fixed roller 16 and the second fixed roller 18 are used to drive the first sanding belt 8 and the second sanding belt 10 to run, thereby realizing sanding driving operation.

[0025] In order to limit the deflection roller 7 in the first sanding section 3 when automatically adjusting the angle, prevent the deflection roller 7 from running off, and ensure that the deflection roller 7 can adapt to the lifting and lowering adjustment state of the first lifting roller 6, two connecting frames 20 fixedly connected to it are provided on the mounting platform 2. The two connecting frames 20 are respectively located on both sides of the conveyor belt 1. A vertical slide 21 is vertically opened on the connecting frame 20, and a first sliding shaft seat 22 is provided in the vertical slide 21. The ends of the first lifting roller 6 and the second lifting roller 9 correspond to the first sliding shaft seat 22. The first sliding shaft seats 22 at both ends of the first lifting roller 6 are also fixedly installed with a horizontal limit plate 23 and an inclined limit plate 24. The horizontal limit plate 23 is fixedly installed above the first sliding shaft seat 22, and the inclined limit plate 24 is fixedly installed below the first sliding shaft seat 22.

[0026] The deflection roller 7 is provided with elastic force through the torsion spring 13, so that the deflection roller 7 has a driving force to press downward. When contacting the wooden knot, the resistance force can overcome the torsional elastic force of the torsion spring 13, forcing the deflection roller 7 to deflect upward to avoid the wooden knot. During the contact process, a relatively soft sanding driving force is applied to it, which can not only perform preliminary sanding operations on the wooden knot, but also prevent excessive force from causing the knot to crack or produce radial cracks.

[0027] A horizontal slide groove 25 is also provided on the connecting frame 20, and a second sliding shaft seat 26 is slidingly provided in the horizontal slide groove 25. The ends of the first tensioning roller 17 and the second tensioning roller 19 are both installed in the corresponding second sliding shaft seat 26. A spring 27 is also provided in the horizontal slide groove 25, one end of the spring 27 is fixedly connected to the end of the horizontal slide groove 25, and the other end of the spring 27 is fixedly connected to the second sliding shaft seat 26.

[0028] Under the elastic force of the spring 27, the second sliding shaft connector 26 always has a horizontal pulling force in the direction away from the first fixed roller 16 or the second fixed roller 18, so that the first tensioning roller 17 and the second tensioning roller 19 installed on the second sliding shaft connector 26 can realize the tensioning function.

[0029] like Figure 5 The driving assembly shown includes a rotary driver 28, a first rotating shaft 29, a second rotating shaft 30, a gear set 31, a first synchronous belt 32 and a second synchronous belt 33. The first rotating shaft 29 coaxially arranged with the sanding disc 11 is vertically arranged on the mounting platform 2. The rotary driver 28 is fixedly arranged on the mounting platform 2 and its output end is fixedly connected to the first rotating shaft 29. The second rotating shaft 30 is horizontally rotatably arranged on one side of the mounting platform 2. The second rotating shaft 30 is connected to the first rotating shaft 29 through a gear set 31. The two ends of the first synchronous belt 32 are respectively mounted on the second rotating shaft 30 and the second lifting roller 9. The two ends of the second synchronous belt 33 are respectively mounted on the first lifting roller 6 and the second lifting roller 9.

[0030] During sanding, the output of the rotary driver 28 drives the first rotating shaft 29, which in turn drives the sanding disc 11, which is fixedly connected to it, to drive the sanding disc 11. Simultaneously, a gear train 31 drives the second rotating shaft 30, which is perpendicular to the first rotating shaft 29. This second rotating shaft 30, via a first synchronous belt 32, drives the second fixed roller 18, which in turn drives the second sanding belt 10. Simultaneously, the second fixed roller 18 drives the first fixed roller 16, via a second synchronous belt 33, to rotate synchronously. This, in turn, drives the first sanding belt 8, thereby achieving the overall drive function.

[0031] like Figure 2-Figure 3 The adjustment assembly shown includes a first linear drive 34 and a second linear drive 35 vertically arranged on the mounting platform 2. The first linear drive 34 is connected to the first sliding shaft seat 22 on which the first lifting roller 6 is installed through a first downward push rod 36. The second linear drive 35 is connected to the first sliding shaft seat 22 on which the second lifting roller 9 is installed through a second downward push rod 37. An elastic telescopic rod is installed at the connection between the first sliding shaft seat 22 on which the second lifting roller 9 is installed and the second downward push rod 37.

[0032] The first linear driver 34 output drives the first downward push rod 36 to move vertically, thereby driving the first sliding shaft connector 22 fixedly connected to the first downward push rod 36 to move, and the first lifting roller 6 installed on the first sliding shaft connector 22 moves synchronously with it. The second linear driver 35 output drives the second downward push rod 37 to move vertically, thereby driving the first sliding shaft connector 22 fixedly connected to the second downward push rod 37 to move, and the second lifting roller 9 installed on the first sliding shaft connector 22 moves synchronously with it, thereby realizing the height adjustment operation of the adjustment component.

[0033] It is worth mentioning that the elastic telescopic rod can provide a certain elastic force for the second lifting roller 9, thereby preventing the rigid connection from causing the knot to collapse and improving the adaptability of sanding.

[0034] In order to adapt to the sanding operation of small plates of different thicknesses, the mounting platform 2 is connected to the conveyor belt 1 via an electric lifting column 39 .

[0035] The height of the mounting platform 2 can be adjusted as a whole by the electric lifting column 39, thereby driving the overall height adjustment of the sanding components arranged on the mounting platform 2 to match small plates of different thicknesses and improve the practicality of the equipment.

[0036] Negative pressure adsorption holes 38 are provided on the surface of the conveyor belt 1 .

[0037] Since small plates are light in weight, they are prone to deviation during transportation and sanding operations. In addition to the limiting device (not shown in the figure) set on the conveyor belt, the negative pressure adsorption holes 38 can adsorb small plates to prevent them from deflecting, thereby improving the stability and accuracy of the sanding operation and improving the surface treatment effect.

[0038] In order to prevent burrs, small gaps, cracks, etc. on the bottom surface of the small plate from affecting the adsorption effect of the negative pressure adsorption holes 38, a rubber cushion layer is further provided on the surface of the conveyor belt 1.

[0039] By setting up the rubber pad, the tiny gaps at the bottom of the small plate can be filled, the negative pressure adsorption effect can be improved, and the displacement during transportation or sanding operations can be avoided.

[0040] A continuous surface sanding process for a small plate workpiece includes the following steps: S1: Adjust the height of the mounting platform 2 so that the sanding assembly can adapt to the thickness of the small plate. The conveyor belt 1 transports the small plate. When it moves under the mounting platform 2, the sanding assembly installed thereon performs sanding on the surface of the small plate. S2: The detection sensor 15 detects whether there are high protrusions or knots on the surface of the small board. When a position requiring special treatment is detected, the first lifting roller 6 in the first sanding unit 3 is lifted to a certain height so that the height of the first sanding belt 8 at the surface contact portion is higher than the height of the wood knot, so that the first sanding belt 8 can be in contact with the protrusion for sanding. S3: driving the second lifting roller 9 to a certain height, which is lower than the height of the first lifting roller 6, so that it can perform a partial sanding operation on the wood knot; S4: The small plate is subjected to final sanding by the sanding disc 11. After the above process is completed, the conveyor belt 1 drives the small plate to be unloaded.

[0041] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A continuous surface sanding device for small plate workpieces, comprising a conveyor belt (1) and a mounting platform (2) mounted thereon, characterized in that: A sanding assembly and an adjusting assembly are provided on the mounting platform (2). The sanding assembly is provided with a first sanding section (3), a second sanding section (4) and a third sanding section (5) in sequence along the transmission direction. The first sanding section (3) is composed of a first lifting roller (6), a deflection roller (7) and a first sanding belt (8). The second sanding section (4) is composed of a second sanding belt (10) and a second elastic lifting roller (9). The third sanding section (5) is provided with a rotatable sanding disc (11). The adjusting assembly is respectively connected to the first lifting roller (6) and the second lifting roller (9). The deflection roller (7) is located between the first lifting roller (6) and the second lifting roller (9). ) is close to the side of the second lifting roller (9), the deflection roller (7) and the first lifting roller (6) are connected through a connecting plate (12), a torsion spring (13) and a sleeve (14) are provided at the connection between the connecting plate (12) and the first lifting roller (6), the first lifting roller (6) passes through the sleeve (14) and is connected to the connecting plate (12), a detection sensor (15) with the same height as the sanding disc (11) is provided on the mounting platform (2), a driving component connected to the sanding disc (11) is provided on the mounting platform (2), and the sanding disc (11) is connected to the first sanding belt (8) and the second sanding belt (10) in a transmission manner.

2. A continuous surface sanding device for small plate workpieces according to claim 1, characterized in that: The first sanding section (3) further includes a first fixed roller (16) and a first tensioning roller (17), the first sanding belt (8) is sleeved on the first lifting roller (6), the deflection roller (7), the first fixed roller (16) and the first tensioning roller (17), the first fixed roller (16) is axially connected to the mounting platform (2), the second sanding section (4) further includes a second fixed roller (18) and a second tensioning roller (19), the second sanding belt (10) is sleeved on the second lifting roller (9), the second fixed roller (18) and the second tensioning roller (19), the second fixed roller (18) is axially connected to the mounting platform (2), the first fixed roller (16) is transmission-connected to the second fixed roller (18), and the second fixed roller (18) is transmission-connected to the sanding disc (11).

3. A continuous surface sanding device for small plate workpieces according to claim 2, characterized in that: Two connecting frames (20) fixedly connected to the mounting platform (2) are provided on the mounting platform (2), and the two connecting frames (20) are respectively located on both sides of the conveyor belt (1). A vertical slide groove (21) is vertically opened on the connecting frame (20), and a first sliding shaft seat (22) is provided in the vertical slide groove (21). The ends of the first lifting roller (6) and the second lifting roller (9) correspond to the first sliding shaft seat (22). A horizontal limit plate (23) and an inclined limit plate (24) are also fixedly installed on the first sliding shaft seat (22) at both ends of the first lifting roller (6). The horizontal limit plate (23) is fixedly installed above the first sliding shaft seat (22), and the inclined limit plate (24) is fixedly installed below the first sliding shaft seat (22).

4. A continuous surface sanding device for small plate workpieces according to claim 3, characterized in that: A horizontal slide groove (25) is also provided on the connecting frame (20), and a second sliding shaft seat (26) is slidably provided in the horizontal slide groove (25). The ends of the first tensioning roller (17) and the second tensioning roller (19) are both installed in the corresponding second sliding shaft seat (26). A spring (27) is also provided in the horizontal slide groove (25), and one end of the spring (27) is fixedly connected to the end of the horizontal slide groove (25), and the other end of the spring (27) is fixedly connected to the second sliding shaft seat (26).

5. The continuous surface sanding device for small plate workpieces according to claim 1, characterized in that: The driving assembly includes a rotary driver (28), a first rotating shaft (29), a second rotating shaft (30), a gear set (31), a first synchronous belt (32) and a second synchronous belt (33), wherein the first rotating shaft (29) coaxially arranged with the sanding disc (11) is vertically arranged on the mounting platform (2), the rotary driver (28) is fixedly arranged on the mounting platform (2) and its output end is fixedly connected to the first rotating shaft (29), the second rotating shaft (30) is horizontally rotatably arranged on one side of the mounting platform (2), the second rotating shaft (30) and the first rotating shaft (29) are connected to each other through the gear set (31), the two ends of the first synchronous belt (32) are respectively mounted on the second rotating shaft (30) and the second lifting roller (9), and the two ends of the second synchronous belt (33) are respectively mounted on the first lifting roller (6) and the second lifting roller (9).

6. The continuous surface sanding device for small plate workpieces according to claim 3, characterized in that: The adjustment component includes a first linear drive (34) and a second linear drive (35) vertically arranged on the mounting platform (2), the first linear drive (34) being connected to the first sliding shaft seat (22) on which the first lifting roller (6) is installed through a first downward push rod (36), the second linear drive (35) being connected to the first sliding shaft seat (22) on which the second lifting roller (9) is installed through a second downward push rod (37), and an elastic telescopic rod is installed at the connection between the first sliding shaft seat (22) on which the second lifting roller (9) is installed and the second downward push rod (37).

7. The continuous surface sanding device for small plate workpieces according to claim 1, characterized in that: The mounting platform (2) is connected to the conveyor belt (1) via an electric lifting column (39).

8. The continuous surface sanding device for small plate workpieces according to claim 1, characterized in that: Negative pressure adsorption holes (38) are provided on the surface of the conveyor belt (1).

9. The continuous surface sanding device for small plate workpieces according to claim 8, characterized in that: The surface of the conveyor belt (1) is also provided with a rubber cushion layer.

10. A continuous surface sanding process for a small plate workpiece, applied to the continuous surface sanding device for a small plate workpiece according to claim 1, characterized in that: The following steps are included: S1: adjusting the height of the mounting platform (2) so that the sanding assembly can adapt to the thickness of the small plate, the conveyor belt (1) transports the small plate, and when it runs under the mounting platform (2), the sanding assembly installed thereon performs sanding on the surface of the small plate; S2: Detecting whether there are high raised parts or knots on the surface of the small board by using a detection sensor (15). When a position requiring special treatment is detected, the first lifting roller (6) in the first sanding part (3) is lifted up to a certain height so that the height of the first sanding belt (8) at the surface contact part is higher than the height of the wood knot, so that the first sanding belt (8) can be attached to the raised part for sanding operation; S3: driving the second lifting roller (9) to lift a certain height, which is lower than the height of the first lifting roller (6), so that it can perform a partial sanding operation on the wood knot; S4: The small plate is subjected to final sanding by the sanding disc (11). After the above process is completed, the conveyor belt (1) drives the small plate to be unloaded.

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