A sanding machine for elastic floor production

Abstract

The utility model provides a sanding machine for elastic floor production, including first sanding unit, second sanding unit and be equipped with between the pressure material roll subassembly, cleaning roller subassembly and negative pressure component, negative pressure component includes dust absorption pipe and centrifugal fan, dust absorption pipe lower part structure is the square pipe of length adaptation board width, its suction inlet extends to between first sanding unit and pressure material roll subassembly and is located above the surface of board to be sanded, and its suction outlet is connected with centrifugal fan, cleaning roller subassembly includes cleaning roller and connecting shaft, and cleaning roller is rotatively connected at suction inlet through connecting shaft and its length is adapted with the length of suction inlet, and the surface of cleaning roller is equipped with bristle layer, and bristle layer is tangent to the surface of board and the surface of abrasive belt of first sanding unit simultaneously. The sanding machine of the utility model can clean abrasive belt and board surface impurity simultaneously, improve sanding uniformity and reduce energy consumption, realize the double removal and directional collection of impurity in sanding process.

Description

Technical Field

[0001] This utility model relates to the technical field of plywood production equipment, specifically to a sanding machine for producing resilient flooring. Background Technology

[0002] Plywood is a multi-layered structural board made from rotary-cut or sliced ​​wood veneers as basic units, through processes such as gluing, assembly, and hot pressing. It typically has an odd number of layers (e.g., 3 or 5), with the fiber directions of adjacent veneers perpendicular to each other to improve mechanical stability. Plywood is widely used in furniture manufacturing and architectural decoration. Its surface requires sanding to achieve a certain level of flatness and roughness to facilitate subsequent gluing processes, as a smooth and slightly rough surface is essential for adhesive adhesion. Resilient flooring is a composite furniture / decorative material with plywood as its base material. Its structure generally includes a base layer, an elastic layer (PVC, cork, or rubber) providing cushioning and sound insulation, and a decorative layer. In resilient flooring production, the surface treatment of the base plywood is crucial. The surface must be finely sanded to ensure a firm bond between the layers. If wood chips or dust remain after sanding, the bond between the resilient flooring and the base material will be weak (peel strength reduced by 30%). In the processing of this type of board, the sander drives the high-speed rotating sandpaper to carry out multiple processes such as coarse grinding and fine grinding on the surface of the substrate, eliminating the unevenness of the substrate surface and forming a uniform texture with a certain roughness.

[0003] Existing sanders have significant drawbacks during continuous operation: the sanding area where the sandpaper belt contacts the board continuously generates sawdust and dust. Some fine impurities adhere to the surface of the sandpaper belt due to static electricity or airflow. Once these impurities cover the sanding surface, localized areas of the sandpaper belt lose their sanding ability, leaving untreated patches on the corresponding locations on the board. This problem is particularly pronounced in multi-pass processing scenarios. For example, after the first rough sanding, the board needs to be flattened by a pressure roller before entering the fine sanding process. If residual sawdust on the board surface is not removed, the pressure roller will compact it and embed it into the board surface, preventing the subsequent fine sanding process from effectively treating that area, ultimately resulting in uneven sanding of the finished product surface.

[0004] In existing technologies, such as the patent with authorization announcement number CN220761988U, although an arc-shaped cavity is used in conjunction with a negative pressure system to adsorb sawdust from the surface of the sandpaper belt, its suction port is located above the sandpaper belt, far from the actual sandpaper belt-board contact area where sawdust is generated. This design results in low suction efficiency, requiring a high-power fan to maintain negative pressure, significantly increasing energy consumption. Furthermore, this solution only cleans one side of the sandpaper belt, failing to simultaneously treat impurities already attached to the board surface, and the problem of secondary contamination by impurities after pressure from the pressure roller remains. Therefore, there is an urgent need for a low-power sanding device that can efficiently clean both the sandpaper belt and the board surface during sanding operations and is adaptable to multiple processing requirements. Utility Model Content

[0005] The purpose of this invention is to provide a sanding machine for the production of flexible flooring that can simultaneously clean sandpaper tape and impurities on the surface of the board, improve sanding uniformity and reduce energy consumption. By optimizing the spatial layout and synergistic effect of the negative pressure system and the cleaning roller assembly, the machine achieves dual removal and directional collection of impurities during the sanding process.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] A sanding machine for producing resilient flooring includes a first sanding unit, a second sanding unit, and a pressure roller assembly disposed between the two, and also includes a cleaning roller assembly and a negative pressure assembly;

[0008] The negative pressure assembly includes a suction pipe and a centrifugal fan. The lower structure of the suction pipe is a square pipe with a length adapted to the width of the board. Its suction inlet extends between the first sanding unit and the pressure roller assembly and is located above the surface of the board to be sanded. Its suction outlet is connected to the centrifugal fan.

[0009] The cleaning roller assembly includes a cleaning roller and a connecting shaft. The cleaning roller is rotatably connected to the suction inlet via the connecting shaft and its length is adapted to the length of the suction inlet. The surface of the cleaning roller is provided with a bristle layer, which is tangent to both the surface of the board and the surface of the sandpaper belt of the first sanding unit.

[0010] As a preferred embodiment of this utility model, a first dust curtain is provided on the side of the suction inlet near the pressure roller assembly.

[0011] As a preferred technical solution of this utility model, a dust baffle is provided on the side wall of the suction pipe near the sandpaper belt. The dust baffle is located above the cleaning roller, and its free end extends to one side of the sandpaper belt. A second dust curtain is provided at the free end of the dust baffle.

[0012] As a preferred embodiment of this utility model, the dust baffle is inclinedly disposed on the outer surface of the side wall of the suction pipe near the sandpaper belt, forming an angle of 30°-45° with the side wall of the suction pipe; a notch is provided on the side wall of the suction pipe corresponding to the installation position of the dust baffle, forming an inverted V-shaped opening structure with the dust baffle.

[0013] As a preferred embodiment of the present invention, the first dust curtain includes a base belt and a plurality of elastic slats, the plurality of slats being fixed side by side on the base belt, and the base belt being connected to the side wall of the lower end of the dust suction pipe near the pressure roller assembly.

[0014] As a preferred embodiment of this utility model, the bristle layer is detachably connected to the surface of the cleaning roller via a sleeve. The sleeve is fitted onto the outside of the cleaning roller, and its surface is provided with arrayed bristle planting holes, in which bristles are fixedly connected.

[0015] As a preferred technical solution of this utility model, the bristle layer is detachably connected to the surface of the cleaning roller through multiple bases. The surface of the cleaning roller is provided with 6-8 dovetail grooves extending along its axial direction. The base has an arc-shaped cross section and a trapezoidal structure adapted to the dovetail grooves at its bottom. The surface of the base is provided with arrayed bristle planting holes, and bristles are fixedly connected in the bristle planting holes.

[0016] As a preferred technical solution of this utility model, it also includes a frame, on which a conveyor roller assembly is provided, and the first sanding unit, the pressure roller assembly, and the second sanding unit are sequentially arranged on the frame from the feeding side to the discharging side.

[0017] As can be seen from the above technical solution, the present invention provides a sander for the production of flexible flooring. The bristle layer on the surface of the cleaning roller of the cleaning roller assembly moves in the opposite direction to the sandpaper belt, generating a dynamic sweeping action to peel off the wood chips embedded in the gaps between the sand grains. At the same time, the ends of the bristles contact the surface of the board with a pressing amount of 1-2mm to scrape off the attached dust. The negative pressure component forms a directional airflow above the bristle layer, which allows the peeled impurities to quickly enter the dust suction pipe. The efficiency is significantly improved compared to the traditional side suction method.

[0018] Furthermore, the inclined dust baffle, in conjunction with the first dust baffle curtain, forms a semi-enclosed negative pressure chamber, confining impurities on the sandpaper belt surface within the turbulent zone between the sanding contact area and the suction inlet, preventing sawdust and dust from escaping over a large area. The first and second dust baffle curtains form a double barrier; when the board thickness changes, the elastic dust baffle curtain deforms to compensate, preventing scratches on the board surface; the second dust baffle curtain is also elastic, preventing hard contact with the sandpaper belt and damage to the sandpaper.

[0019] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0020] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0021] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a front view of a sander according to an embodiment of the present utility model;

[0023] Figure 2 This is a side view of a sander according to an embodiment of the present invention;

[0024] Figure 3 This is a side sectional view of a sander according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection structure of the cleaning roller assembly according to an embodiment of the present invention;

[0026] Figure 5 This is a magnified structural diagram of point A;

[0027] Figure 6 This is a schematic diagram of the structure of the cleaning roller dovetail groove interlocking bristle module according to an embodiment of the present invention.

[0028] The meanings of the reference numerals in the figure are as follows:

[0029] 1-Frame 2-Casing 3-Sheet Material 4-Dust Suction Pipe 5-Centrifugal Fan 6-Cleaning Roller 7-Connecting Shaft 8-Sandpaper Belt 9-Sleeve 10-Base 11-First Driven Roller 12-Pressure Roller 13-Dust Baffle 14-Second Dust Baffle 15-First Dust Baffle 16-Conveyor Roller 17-Driven Roller 18-Second Driven Roller Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0031] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] This invention addresses the problem that existing sanders, during operation, produce sawdust and other impurities that cover the sandpaper surface, causing localized loss of sanding ability and leaving untreated patches on the board. It provides a sander for the production of resilient flooring. Figure 1-3 As shown, it includes a frame 1, a housing 2, a first sanding unit, a second sanding unit, a pressure roller assembly, a cleaning roller assembly, and a negative pressure assembly.

[0033] The core improvement of this utility model lies in the negative pressure component and the cleaning roller component. These two components work together to remove and suck away the sawdust and dust generated during the operation of the first sanding unit, achieving continuous and efficient operation of the sandpaper belt 8. This eliminates sanding blind spots caused by surface blockage and thoroughly removes sawdust and dust from the surface of the board 3 before it is compacted by the pressure roller, preventing impurities from embedding. The negative pressure component includes a suction pipe 4 and a centrifugal fan 5. The centrifugal fan 5 is configured using conventional techniques in the field. It forms an airtight connection with the suction outlet of the suction pipe 4 via a flange connection or clamp joint, used to generate negative pressure within the suction pipe 4. For example, a commercially available YDF series industrial centrifugal fan can be used. The lower structure of the suction pipe 4 is a square tube with a length adapted to the width of the board (defined as the board's travel direction as the X-axis and the board's width direction as the Y-axis). Its suction inlet extends between the first sanding unit and the pressure roller component and is located above the surface of the board 3 to be sanded. Its suction outlet is connected to the centrifugal fan 5. When the centrifugal fan 5 is running, a main negative pressure zone is formed at the suction inlet, and the suction force generated by the negative pressure is used to suck away the impurities that have escaped from the vicinity. The cleaning roller assembly includes a cleaning roller 6 and a connecting shaft 7. The cleaning roller 6 is rotatably connected to the suction inlet via the connecting shaft 7, and its length (Y-axis direction) is adapted to the length (Y-axis direction) of the suction inlet. The surface of the cleaning roller 6 is provided with a bristle layer, which is tangent to both the surface of the board 3 and the surface of the sandpaper belt 8 of the first sanding unit. To facilitate subsequent cleaning and replacement of the cleaning roller 6, the cleaning roller 6 and the bristle layer can be modularly designed. One embodiment can adopt a detachable connection method in which the cleaning roller 6 and the sleeve-type bristle assembly cooperate, such as... Figure 5 As shown, the sleeve-type bristle assembly includes a circular sleeve 9 whose inner diameter matches the outer diameter of the cleaning roller 6. The sleeve 9 is injection molded from glass fiber reinforced nylon composite material. During injection molding, bristle embedding holes are pre-drilled on the surface of the sleeve 9 to embed the bristle roots. The bristles are made of 0.15mm polyester monofilaments. After the bristle roots are dipped in PA hot melt adhesive, they are inserted into the bristle embedding holes. After heating and curing, a 1mm thick TPU layer is coated on the outer surface of the sleeve to cover 10% of the bristle roots, forming a bristle layer. The bristle length is 12mm, and the bristle density is 45 holes / cm². 2 Finally, the sleeve 9 is inserted into one end of the cleaning roller 6 to assemble the two. To prevent the sleeve 9 from sliding relative to the cleaning roller during rotation, i.e., to prevent the two from rotating asynchronously, a diamond-shaped anti-slip texture can be injection-molded into the inner wall of the sleeve 9, or a groove-and-contact structure can be provided on the surface of the cleaning roller 6 and the inner side wall of the sleeve. Another embodiment is a dovetail groove interlocking bristle module, such as... Figure 6As shown, 6-8 dovetail grooves are machined axially on the surface of the cleaning roller 6. The grooves are 5mm deep, 8mm wide at the bottom, and 6mm wide at the opening, forming a sidewall inclination angle of 8°-12°. The central angle of adjacent dovetail grooves is 60°-45° (corresponding to 6-8 equal divisions). The bristle module assembly includes multiple bases 10 and bristles. The bases 10 are injection molded from glass fiber reinforced nylon 66. The cross-section of the base 10 is arc-shaped. Multiple bases 10 can be spliced ​​together to form a sleeve-shaped structure adapted to the cleaning roller. The bottom of the base 10 is provided with a trapezoidal structure complementary to the dovetail grooves, such as a trapezoidal insert. The end faces of adjacent bases 10 are provided with male and female tenons with a tenon gap of 0.1mm. The surface of the base 10 is provided with a matrix of bristle implantation holes. The bristles are fixed in the same way as in the above embodiment. During assembly, the base 10 is pushed in along the dovetail grooves. The two detachable connection methods mentioned above allow for quick component replacement. When a single bristle module is damaged, the damaged unit can be replaced independently. Furthermore, the reduced cleaning efficiency caused by surface wear of the sandpaper belt 8 can be compensated by adjusting the bristle hardness combination of different modules.

[0034] like Figure 3-4As shown, the first sanding unit and the second sanding unit are sequentially mounted on the frame 1. The housing 2 is mounted on the frame 1 and covers the outside of the sanding units to prevent the wood chips and dust generated during sanding unit operation from escaping and polluting the factory environment. The centrifugal fan 5 is located on the top outside of the housing 2. The suction outlet at the upper end of the suction pipe 4 passes through the top of the housing 2 and connects to the centrifugal fan 5. The suction inlet at the lower end of the suction pipe 4 is located between the first driven roller 11 and the pressure roller 12. The suction inlet has a square structure, and its square opening is parallel to the conveying plane of the frame 1. A protruding dust baffle 13 is provided on the side of the suction pipe 4 near the first driven roller 11 (which is also the side near the sandpaper belt 8 of the first sanding unit). One end of the dust baffle 13 is connected to the side wall of the suction pipe 4 by welding or integral molding. The free end of the dust baffle 13 extends to the surface of the sandpaper belt 8 to block the wood chips or dust that splash upwards and confine them to the sandpaper belt 8 below. In the sanding area, because the sanding unit consists of three rollers forming an isosceles triangle, the cross-section of the sandpaper belt 8 fitted on the outside is also triangular. Therefore, to save space, the dust baffle 13 is inclinedly set on the side wall of the suction pipe 4, forming an inverted V-shape with the side of the suction pipe 4. Furthermore, to enlarge the suction inlet of the suction pipe 4 for rapid extraction of sawdust, the side wall of the suction pipe 4 opposite to the bottom of the dust baffle 13 is hollowed out, forming an inverted V-shaped opening on the side of the suction pipe 4 in conjunction with the dust baffle 13. This opening communicates with the square opening at the bottom of the suction pipe 4. To prevent the free end of the dust baffle 13 from making hard contact with the sandpaper belt and damaging the surface of the sandpaper belt 8, a second dust curtain 14 is installed on the free end. The flexible curtain prevents the sandpaper belt 8 from being scratched. Bearing sleeves are provided on both ends of the suction inlet of the suction pipe 4 along the Y-axis. The two ends of the connecting shaft 7 are rotatably connected to the bearing sleeves, thereby rotatably connecting the cleaning roller 6, which is mounted on the connecting shaft 7, to the suction inlet. This ensures that the bristles on the surface of the cleaning roller 6 are tangent to the surfaces of the sandpaper belt 8 and the board 3. As can be seen from the above, the cleaning roller 6 of this invention rotates passively, driven by the sandpaper belt 8 or the board 3. The direction of rotation of the cleaning roller 6 depends on the magnitude of the friction between it and the sandpaper belt 8 and the board 3. Because the bristles on the surface of the cleaning roller 6 are always tangent to the surfaces of the board 3 and the sandpaper belt, and both are in motion during operation, it can continuously clean the surfaces of both regardless of the rotation direction of the cleaning roller 8. To make the cleaning roller 6 rotate in a specific direction, a drive device, such as a drive motor, can be connected to one end of the connecting shaft 7. A coupling can be used to connect the output shaft of the drive motor to the connecting shaft, thereby enabling the cleaning roller 6 to actively rotate in the specified direction via the drive motor. A first dust curtain 15 is provided on the side of the suction inlet near the pressure roller 12 to prevent sawdust and dust from escaping to the side of the pressure roller and to confine them near the suction inlet for rapid removal.To prevent the dust curtain from scratching the surface of the sandpaper belt 8 and obstructing the conveying of the board 3, the first dust curtain 15 maintains a gap of 1-3mm with the surface of the board 3, which prevents scratching the board 3 and also prevents sawdust from flying towards the pressure roller; the second dust curtain 14 extends downward at an angle to 0.5-1.0mm above the surface of the sandpaper belt 8. The first dust curtain 15 is composed of multiple independent elastic strips arranged side by side to form a strip curtain. The elastic strips can be made of thermoplastic polyurethane or silicone, with each strip measuring 10-15mm in length, 5-10mm in width, and 1-1.2mm in thickness. Multiple elastic strips are fixed side by side to the edge of the suction inlet of the suction pipe 4 by high-temperature hot melting or adhesive, with a spacing of 0.5-2mm between adjacent elastic strips to form a gap, allowing airflow to pass through but preventing sawdust from escaping. The structure of the second dust curtain 14 is the same as that of the first dust curtain 15. When there are protrusions (such as seams) on the surface of the board 3, the elastic band at the corresponding position can bend upward to avoid obstructing the board 3; when the bottom of the elastic band contacts the surface of the sandpaper belt 8, because the material is soft and can deform independently, it can avoid forming a hard scratch with the sandpaper belt 8.

[0035] The frame 1 is equipped with a conveyor roller assembly for uniformly conveying the sheet material 3 from its feed side to its discharge side. The conveyor roller assembly adopts a conventional structure found in existing technology, including several conveyor rollers 16, a drive motor, and a transmission chain or belt. The conveyor rollers 16 are 80mm diameter rubber-coated rollers. Multiple conveyor rollers 16 are rotatably connected to the frame 1 via support bearing seats. The output shaft of a 1.5kW variable frequency motor is connected to the rotating shaft of the conveyor rollers 16 via a chain or belt. The roller spacing is set to 300mm to accommodate sheet material thicknesses of 10-50mm. The upper surface of the conveyor rollers 16 forms the conveying plane for the sheet material 3. In this design, the conveyor roller assembly's function is solely to convey the sheet material 3 sequentially through the first sanding unit, the cleaning roller assembly, the pressure roller assembly, and the second sanding unit. Specific parameters (such as roller spacing and rotation speed) are selected based on the sheet material size and processing requirements, and are considered conventional techniques for those skilled in the art.

[0036] In a sander, the sanding unit is the main unit for sanding and polishing the surface of the board, and wood chips and dust are generated by this unit during operation. The sanding unit of this embodiment includes a first sanding unit and a second sanding unit arranged sequentially on the frame from the feed side to the discharge side, with a pressure roller assembly between them. The first sanding unit mainly includes a sandpaper belt 8, a drive roller 17, a first driven roller 11, a second driven roller 18, and a drive motor. The sandpaper belt 8 adopts a ring-shaped sandpaper structure, and the grit is selected according to the processing stage (e.g., 80-150 grit for rough grinding and 180-320 grit for fine grinding). The drive roller 17 has a diameter of 80-120 mm, is covered with a high-friction coefficient rubber layer, and is set on the conveying plane (board conveying surface) of the frame 1. The first driven roller 11 has the same structure and dimensions as the drive roller 17, is also located on the conveying plane of the frame 1, and its axis is parallel to the drive roller 17. The diameter of the first driven roller 17 is the same as that of the active roller 17. The second driven roller 18 is positioned above the midpoint of the axis connection between the active roller 17 and the first driven roller 11, forming an isosceles triangle (vertices 30°-60°). This triangle is used to tension the sandpaper belt 8 and increase the contact area between the sandpaper belt and the board 3. The active roller, the first driven roller 11, and the second driven roller 18 are all rotatably connected to the frame 1 via bearing seats. The sandpaper belt 8 is fitted onto the outside of the three rollers. The drive motor drives the active roller 17 to rotate via a coupling or synchronous belt, with a power of 3-7.5kW (matched according to the width of the sandpaper belt and the load). The structure of the second sanding unit is the same as that of the first sanding unit. The only difference between the two is the grit of the sandpaper belt. The first sanding unit uses coarse sandpaper belt (80-150 grit) to remove burrs and unevenness from the surface of the board. The second sanding unit uses fine sandpaper belt (180-320 grit). The aforementioned sanding unit structures all directly adopt existing technologies without any improvements to their roller layout, drive method, or sandpaper belt tensioning mechanism. Multiple sanding operations (rough grinding → fine grinding) and the selection of sandpaper grit gradients are conventional processes in this field and will not be elaborated upon here. The pressure roller assembly, as a key transitional component connecting the rough grinding and fine grinding processes, is used to: flatten the board to prevent warping; apply vertical pressure to the board after rough grinding in the first sanding unit to eliminate localized warping caused by stress release during sanding, ensuring the board enters the second sanding unit flat and avoiding uneven sanding due to unevenness during fine grinding; suppress vibration transmission by absorbing high-frequency vibrations from the sanding rollers through its external elastic coating layer, reducing vibration transmission to subsequent processes, reducing abnormal wear of the sandpaper belt during the fine grinding stage, and extending the service life of the sandpaper belt; and apply controllable tension to the board through air pressure or a spring mechanism to counteract fluctuations in the driving force of the conveyor rollers, ensuring the board passes through the sanding area at a uniform speed and avoiding inconsistent sanding depths.The pressure roller assembly of this utility model mainly includes a pair of pressure rollers 12, which are arranged side by side on the conveying plane of the frame 1 via bearing seats, with a spacing of 5-10mm. The roller body diameter of the pressure roller 12 is 50-80mm, and the surface is covered with a polyurethane or silicone layer. The bearing seats at both ends are connected to the frame 1 via cylinders or spring mechanisms. The structure and function of the pressure roller assembly are conventional technical means in multi-pass processing of sanding machines. Its design parameters (such as pressure range, coating hardness, etc.) and layout are common knowledge known to those skilled in the art. This solution does not improve the pressure roller assembly itself; its role in this solution is only to assist in realizing continuous processing of the sheet metal and surface quality control.

[0037] The working principle of this utility model embodiment: The board 3 enters the sander from the feeding side of the frame 1 and is coarsely ground when passing through the first sanding unit. At this time, a lot of wood chips and dust are generated. Most of the scattered wood chips and dust are sucked into the dust suction pipe 4 by the negative pressure generated by the centrifugal fan 5. A small part of the wood chips and dust adhering to the surface of the sandpaper belt 8 or the surface of the board 3 are scraped off by the brush layer on the surface of the cleaning roller 6 and then sucked away by the negative pressure, thereby keeping the surface of the sandpaper belt 8 and the surface of the board 3 clean, so that the sandpaper belt 8 can continue to sand efficiently without affecting the subsequent fine grinding process of the board 3.

[0038] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A sanding machine for producing resilient flooring, comprising a first sanding unit, a second sanding unit, and a pressure roller assembly disposed between the two, characterized in that, It also includes a cleaning roller assembly and a negative pressure assembly; The negative pressure assembly includes a dust suction pipe (4) and a centrifugal fan (5). The lower structure of the dust suction pipe (4) is a square pipe with a length adapted to the width of the plate. Its suction inlet extends between the first sanding unit and the pressure roller assembly and is located above the surface of the plate (3) to be sanded. Its suction outlet is connected to the centrifugal fan (5). The cleaning roller assembly includes a cleaning roller (6) and a connecting shaft (7). The cleaning roller (6) is rotatably connected to the suction inlet via the connecting shaft and its length is adapted to the length of the suction inlet. The surface of the cleaning roller (6) is provided with a bristle layer, which is tangent to both the surface of the board (3) and the surface of the sandpaper belt (8) of the first sanding unit.

2. The sanding machine for producing resilient flooring according to claim 1, characterized in that, A first dust curtain (15) is provided on the side of the suction inlet near the pressure roller assembly.

3. The sanding machine for producing resilient flooring according to claim 1, characterized in that, The suction pipe (4) has a dust baffle (13) on its side wall near the sandpaper belt (8). The dust baffle (13) is located above the cleaning roller (6), and its free end extends to one side of the sandpaper belt (8). The free end of the dust baffle (13) is provided with a second dust curtain (14).

4. The sanding machine for producing resilient flooring according to claim 3, characterized in that, The dust baffle (13) is inclinedly disposed on the outer surface of the side wall of the suction pipe (4) near the sandpaper belt (8), forming an angle of 30°-45° with the side wall of the suction pipe (4); the side wall of the suction pipe (4) is provided with a notch corresponding to the installation position of the dust baffle (13), forming an inverted V-shaped opening structure with the dust baffle (13).

5. The sanding machine for producing resilient flooring according to claim 2, characterized in that, The first dust curtain (15) includes a base belt and a plurality of elastic slats, the plurality of slats being fixed side by side on the base belt, the base belt being connected to the side wall of the lower end of the suction pipe (4) near the pressure roller assembly.

6. The sanding machine for producing resilient flooring according to claim 1, characterized in that, The bristle layer is detachably connected to the surface of the cleaning roller (6) via a sleeve (9). The sleeve (9) is fitted onto the outside of the cleaning roller (6), and its surface is provided with an array of bristle planting holes, in which bristles are fixedly connected.

7. The sanding machine for producing resilient flooring according to claim 1, characterized in that, The bristle layer is detachably connected to the surface of the cleaning roller (6) via multiple bases (10). The surface of the cleaning roller (6) is provided with 6-8 dovetail grooves extending along its axial direction. The base (10) has an arc-shaped cross section and a trapezoidal structure adapted to the dovetail grooves at its bottom. The surface of the base (10) is provided with arrayed bristle planting holes, and bristles are fixedly connected in the bristle planting holes.

8. The sanding machine for producing resilient flooring according to claim 1, characterized in that, It also includes a frame, on which a conveyor roller assembly is provided, and the first sanding unit, the pressing roller assembly, and the second sanding unit are arranged sequentially on the frame (1) from the feeding side to the discharging side.

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