Sponge composite grid sanding block structure

Abstract

The utility model discloses a sponge composite grid sanding block structure which comprises two sponge layers which are arranged in a mutually stacked mode, first grids are arranged on the inner sides of the two sponge layers which are stacked, second grids are arranged on the outer sides of the two sponge layers, the two sponge layers are connected through a flexible connecting part with flexibility and elasticity, and the two sponge layers are connected through a first grid and a second grid. The flexible connecting part enables the two sponge layers to be turned over relatively; the sides, away from the flexible connecting part, of the two sponge layers are each provided with two sets of turnover positioning structures, the flexible connecting part is a flexible rubber strip, and each turnover positioning structure comprises a positioning table arranged on the corresponding sponge layer. By arranging the two sponge layers capable of being turned over oppositely and the grids on the inner side and the outer side, cyclic utilization of the grinding face is achieved, the replacement frequency is reduced, the service life is prolonged, cost is reduced, meanwhile, it is guaranteed that the sponge layers are turned over accurately in place through the turning positioning structure, the structure is stable during grinding, grinding accuracy and stability are guaranteed, and the workpiece machining quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sanding tool technical field, especially a kind of sponge composite grid sanding block structure. BACKGROUND

[0002] In industrial polishing operation, sanding block is used as common polishing tool, and its use frequency is high, and polishing surface is easily worn out. The traditional sanding block usually only has single polishing surface, once the polishing surface is worn out due to long-time use, the polishing effect and precision of sanding block will significantly decrease, and even cannot continue to use, and only overall replacement can be carried out. Frequent replacement not only causes material waste, greatly increases production cost, but also interrupts polishing operation process, reduces work efficiency, although part sanding block is designed with multi-surface polishing structure, but in the switching process of different polishing surfaces, there are problems such as poor structural stability, inaccurate positioning, etc., which makes it difficult to guarantee polishing precision, and affects the machining quality of workpiece.

[0003] Therefore, we propose a kind of sponge composite grid sanding block structure. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a kind of sponge composite grid sanding block structure, in order to prevent sanding block polishing surface from being worn out to cause polishing effect and precision to decrease, avoid frequent overall replacement to cause material waste and production cost increase, eliminate the problem of work efficiency reduction caused by interrupting polishing operation process due to replacement, simultaneously solve the problems such as poor structural stability, inaccurate positioning, etc. of part multi-surface polishing structure sanding block in the switching of different polishing surfaces, so as to improve polishing precision, guarantee the machining quality of workpiece, reduce material waste, reduce production cost and improve the work efficiency of polishing operation, which can effectively solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] A kind of sponge composite grid sanding block structure, including two mutually laminated sponge layers, the inner side of two laminated sponge layers is provided with first grid, the outer side of two sponge layers is provided with second grid, two sponge layers are connected by flexible connecting part with flexibility and elasticity, and flexible connecting part makes two sponge layers can be relatively turned over;Two sides of two sponge layers away from flexible connecting part are each provided with two groups of turnover positioning structure.

[0007] By adopting the above technical scheme, in the initial state, the second grid on the outer side is used for grinding the workpiece, when the second grid on the outer side is worn out, since the two sponge layers are connected through the flexible connecting part with flexibility and elasticity, the two sponge layers can be relatively turned over, after turning over, the first grid originally on the inner side is turned over to the outer side, replacing the worn second grid to continue the grinding work, and the two groups of turning positioning structures arranged on the side away from the flexible connecting part of the two sponge layers play a role after the sponge layer is turned over in place, ensuring that the first grid is in the accurate position, ensuring the grinding accuracy and stability, so that different grids are recycled, prolonging the service life of the sanding block.

[0008] Further, the flexible connecting part is a flexible rubber strip.

[0009] By adopting the above technical scheme, the flexible rubber strip has good flexibility and elasticity, which enables it to act as a connecting bridge between the two sponge layers, when the second grid on the outer side of the sanding block is worn due to long-term use and needs to be replaced, the flexible rubber strip allows the two sponge layers to relatively turn over around it, it does not limit the movement of the sponge layer like a rigid connection, but can bend and deform with the rotation of the sponge layer, thereby providing the necessary conditions for the turning over of the sponge layer.

[0010] During the relative turning over of the two sponge layers, the flexible rubber strip always maintains the connecting effect of the two sponge layers, even if the sponge layers are turned over to different angles, the flexible rubber strip can tightly connect the two sponge layers together through its elastic deformation, preventing them from separating during the turning over process, and ensuring the overall structural integrity of the sanding block.

[0011] When the sponge layer is turned over to the appropriate position, so that the new grid such as the first grid originally on the inner side or the second grid on the other side is on the outer side and can be used for grinding, the elasticity of the flexible rubber strip can also play a certain auxiliary positioning role, it can provide a certain restoring force to help the sponge layer stabilize in the ideal turning over position, and at the same time cooperate with the turning positioning structure positioning table, the positioning protrusion and the positioning groove, so that the positioning protrusion is more accurately embedded in the positioning groove, achieving precise positioning, so that the sanding block can stably perform subsequent grinding work.

[0012] During the use cycle of the sanding block, it may be necessary to perform turning over operation several times to replace different grids for grinding, the flexible rubber strip can withstand the process of bending, stretching and restoring deformation several times, always maintaining good connecting performance and elasticity, ensuring that the sanding block can smoothly perform turning over and grinding work during the entire service life.

[0013] Further, the overturning positioning structure comprises positioning platforms arranged on the sponge layers, and positioning protrusions are arranged at the bottom ends of the positioning platforms at the lower parts of one side of the two sponge layers, and positioning recesses are arranged at the top ends of the positioning platforms at the upper parts of one side of the two sponge layers.

[0014] By adopting the above technical scheme, when the sponge layers are overturned to a suitable position and a new grid, which can be the first grid originally on the inside or the second grid on the other side, is prepared to become a polishing surface, the positioning platforms, the positioning protrusions and the positioning recesses begin to play a role. On one side of the two sponge layers, the positioning protrusions at the bottom ends of the positioning platforms at the lower parts cooperate with the positioning recesses at the top ends of the positioning platforms at the upper parts on the other side. When the two sponge layers are overturned to the position, the positioning protrusions are accurately embedded in the positioning recesses. This cooperation can ensure that the two sponge layers are accurately aligned after overturning, so that the new polishing surface is at a suitable position and angle.

[0015] After the positioning protrusions are embedded in the positioning recesses, the two sponge layers are stably fixed together. In the subsequent polishing process, the sponge layers can be prevented from relative displacement, the stability of the sanding block is ensured, and the new grid can continuously and stably polish the workpiece. When the new polishing surface is worn again, the overturning and positioning operations described above can be repeated to continue to alternately use different grids.

[0016] Further, the positioning protrusions and the positioning recesses are mutually matched in shape.

[0017] By adopting the above technical scheme, when the two sponge layers are overturned relative to each other under the action of the flexible connecting part, the mutually matched positioning protrusions and the positioning recesses can play an accurate guiding role. The positioning protrusions will be embedded along the shape profile of the positioning recesses, just like the two pieces of a jigsaw puzzle fitting each other, guiding the two sponge layers to accurately overturn to the predetermined position, ensuring that the new polishing surface, such as the first grid originally on the inside or the second grid on the other side, can accurately align the surface of the workpiece to be polished, avoiding positional deviation, thereby ensuring the accuracy and stability of the polishing work.

[0018] Since the positioning protrusions and the positioning recesses are mutually matched in shape, after the two sponge layers are overturned to the position, they can be tightly matched. The positioning protrusions can be completely embedded in the positioning recesses, and the gap between them is extremely small. This can effectively prevent the two sponge layers from relative displacement or shaking during polishing, whether under normal polishing pressure or in some more complex polishing operations. The tight fit can ensure the structural stability of the sanding block, so that the polishing work can be continuously and uniformly carried out.

[0019] During the multiple uses of the sanding block, the sponge layers need to be frequently turned over to alternate the use of different meshes for polishing. The mutual fitting characteristics of the positioning protrusions and the positioning grooves ensure accurate positioning after each turn over. No matter how many times the turn over is, as long as they are operated according to their fitting shapes, it can be ensured that the two sponge layers can always return to the correct relative position, thereby ensuring the normal use of the sanding block and prolonging the overall service life thereof.

[0020] Further, the edges of the sponge layers are provided with sealing connecting parts.

[0021] By adopting the above technical scheme, the sealing connecting parts can form a relatively closed space between the two sponge layers, preventing foreign matters such as dust, debris and abrasive from entering the interior of the sponge layers and the connecting part of the mesh and the sponge layer, which helps to keep the interior of the sanding block clean and avoid the abrasion or damage of the mesh and the sponge layer by foreign matters, thereby prolonging the service life of the sanding block.

[0022] It can enhance the connecting strength of the edges of the two sponge layers, so that the sanding block forms a more stable structure as a whole. During use, especially when the workpiece is polished, the sanding block will be subjected to various forces. The sealing connecting parts can prevent the edges of the sponge layers from separating or deforming due to the force, so as to ensure that the shape and structure of the sanding block remain stable, thereby ensuring the consistency and reliability of the polishing effect.

[0023] Further, the surfaces of the first mesh and the second mesh are provided with a sand layer.

[0024] By adopting the above technical scheme, the sand grains in the sand layer have high hardness and sharpness. When the sanding block is in contact with the surface of the workpiece and pressure is applied for polishing, the sand grains will rub against the surface of the workpiece to remove burrs, oxidation layer, excess material and the like on the surface of the workpiece through cutting, scraping and the like, so as to make the surface of the workpiece meet the required flatness, smoothness and accuracy requirements. The mesh structure of the first mesh and the second mesh uniformly distributes the sand layer on the surface of the sponge layer, so that the sand grains can uniformly act on the surface of the workpiece during polishing, which helps to avoid uneven polishing and ensure the quality consistency of the surface of the workpiece, reducing the problem of excessive or insufficient polishing in local areas.

[0025] The existence of the mesh provides good support and fixation for the sand layer. The pores of the mesh can accommodate the sand grains to prevent the sand grains from easily falling off during polishing, so that the sand grains can continuously play a polishing role. At the same time, the structure of the mesh can also keep the sand grains in a relatively stable position when subjected to external force, ensuring the stability and continuity of the polishing effect.

[0026] The sponge layer has certain elasticity and buffering effect, can provide buffering for the sand layer when the sanding block contacts with the workpiece, and reduces sand particle breakage or falling caused by direct impact.

[0027] Compared with the prior art, the utility model has the advantages of:

[0028] (1)The utility model relates to a sponge composite grid sanding block structure, which is provided with two sponge layers that are stacked with each other and can be flipped relative to each other, and is provided with a first grid on the inner side and a second grid on the outer side, so that the polishing surface can be recycled. When the second grid on the outer side is worn, the two sponge layers can be flipped relative to each other through the flexible connecting part, and the first grid originally on the inner side is flipped to the outer side to continue the polishing work. This design changes the limitation of the single polishing surface of the traditional sanding block, so that the sanding block can be used alternately with different grids for polishing, the frequency of replacing the sanding block as a whole due to the wear of the polishing surface is greatly reduced, the service life of the sanding block is effectively prolonged, the production cost is reduced, and the resource utilization efficiency is improved.

[0029] (2)The utility model relates to a sponge composite grid sanding block structure, and the sanding block is provided with a flipping positioning structure, which comprises a positioning table, a positioning protrusion and a positioning groove, and the shapes of the positioning protrusion and the positioning groove are matched with each other. During the flipping process of the sponge layer, the positioning protrusion and the positioning groove play the role of accurate guidance, guide the sponge layer to flip to the predetermined position accurately, and ensure that the new polishing surface can be accurately aligned with the surface of the workpiece to be polished. When the sponge layer is flipped to the position, the positioning protrusion is accurately embedded in the positioning groove, the close cooperation is realized, and the relative displacement or shaking of the two sponge layers during the polishing process is effectively prevented. Whether the normal polishing pressure or the complex polishing operation can ensure the structural stability of the sanding block, so that the polishing work can be continuously and uniformly carried out, thereby ensuring the accuracy and stability of the polishing operation and improving the machining quality of the workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic view of the utility model of a sponge composite grid sanding block structure.

[0031] Figure 2 It is a first grid structure schematic view of the utility model of a sponge composite grid sanding block structure.

[0032] Figure 3 It is a sponge layer structure schematic view of the utility model of a sponge composite grid sanding block structure.

[0033] In the drawing: 1, sponge layer; 2, first grid; 3, second grid; 4, flexible connecting part; 5, positioning table; 6, positioning protrusion; 7, positioning groove; 8, sand layer; 9, sealing connecting part. DETAILED DESCRIPTION

[0034] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0035] In order to prevent the grinding surface of the sanding block from being worn to cause the grinding effect and precision to be reduced, avoid material waste and increased production cost caused by frequent overall replacement, eliminate the reduction of work efficiency caused by the interruption of the grinding operation process due to replacement, simultaneously solve the problems of poor structural stability and inaccurate positioning of the sanding block with the multi-surface grinding structure when different grinding surfaces are switched, thereby improving the grinding precision, ensuring the machining quality of the workpiece, reducing material waste, reducing production cost and improving the work efficiency of the grinding operation, as shown in Figure 1 、 Figure 2 、 Figure 3 A sponge composite grid sanding block structure, which comprises two sponge layers 1 arranged in layers, the inner side of the two sponge layers 1 is provided with a first grid 2, the outer side of the two sponge layers 1 is provided with a second grid 3, the two sponge layers 1 are connected through a flexible connecting part 4 with flexibility and elasticity, and the flexible connecting part 4 enables the two sponge layers 1 to be relatively flipped, and the side of the two sponge layers 1 away from the flexible connecting part 4 is provided with two groups of flipping positioning structures.

[0036] In use, in the initial state, the second grid 3 on the outer side is used for grinding the workpiece, when the second grid 3 on the outer side is worn, the two sponge layers 1 can be relatively flipped due to the connection between the two sponge layers 1 through the flexible connecting part 4 with flexibility and elasticity, after flipping, the first grid 2 originally on the inner side is flipped to the outer side, the second grid 3 which is worn is replaced to continue the grinding work, and the two groups of flipping positioning structures provided on the side of the two sponge layers 1 away from the flexible connecting part 4 play a role after the sponge layer 1 is flipped in place, ensuring that the first grid 2 is in the accurate position, ensuring the grinding precision and stability, so that different grids are recycled, prolonging the service life of the sanding block.

[0037] As shown in Figure 1 、 Figure 2 、 Figure 3 The utility model further comprises that the flexible connecting part 4 is a flexible rubber strip.

[0038] In use, the flexible rubber strip has good flexibility and elasticity, which enables it to act as a connecting bridge between the two sponge layers 1, when the second grid 3 on the outer side of the sanding block is worn due to long-term use and needs to be replaced, the flexible rubber strip allows the two sponge layers 1 to be relatively flipped with it as the axis, it does not limit the movement of the sponge layer 1 like rigid connection, but can bend and deform along with the rotation of the sponge layer 1, thereby providing the necessary conditions for the flipping of the sponge layer 1;

[0039] During the process of turning over the two sponge layers 1, the flexible rubber strip always maintains the connection of the two sponge layers 1, even if the sponge layers 1 are turned over to different angles, the flexible rubber strip can tightly connect the two sponge layers 1 together through its elastic deformation, prevent them from separating during the turning over process, and ensure the overall structural integrity of the sanding block;

[0040] When the sponge layers 1 are turned over to the appropriate position, so that the new grid, such as the first grid 2 originally on the inside or the second grid 3 on the other side, is on the outside and can be used for polishing, the elasticity of the flexible rubber strip can also play a certain auxiliary positioning role, which can provide a certain restoring force to a certain extent, help the sponge layers 1 to be stable at the ideal turning over position, and cooperate with the turning over positioning structure to position the platform 5, the positioning protrusion 6 and the positioning groove 7, so that the positioning protrusion 6 is more accurately embedded in the positioning groove 7, precise positioning is achieved, and the sanding block can stably perform subsequent polishing work;

[0041] During the use cycle of the sanding block, it may be necessary to perform turning over operation multiple times to replace different grids for polishing. The flexible rubber strip can withstand the process of bending, stretching and restoring deformation multiple times, always maintain good connection performance and elasticity, and ensure that the sanding block can smoothly perform turning over and polishing work during the entire service life.

[0042] As shown in Figure 1 、 Figure 2 、 Figure 3 The utility model discloses still include, the turning over positioning structure includes setting on the positioning platform 5 of sponge layer 1, two the positioning platform 5 bottom of sponge layer 1 one side lower part is equipped with positioning protrusion 6, two the positioning platform 5 top of sponge layer 1 one side upper part is equipped with positioning groove 7.

[0043] When the sponge layers 1 are turned over to the appropriate position, the positioning platform 5, the positioning protrusion 6 and the positioning groove 7 begin to play a role, and the positioning protrusion 6 at the bottom end of the lower positioning platform 5 on one side cooperates with the positioning groove 7 at the top end of the upper positioning platform 5 on the other side when the two sponge layers 1 are turned over in place, the positioning protrusion 6 is accurately embedded in the positioning groove 7, and the cooperation can ensure that the two sponge layers 1 are accurately aligned after turning over, so that the new polishing surface is at the appropriate position and angle;

[0044] After the positioning protrusion 6 is embedded in the positioning groove 7, the two sponge layers 1 are stably fixed together, and during the subsequent polishing process, the sponge layers 1 can be prevented from relatively moving, the stability of the sanding block is ensured, and the new grid can continuously and stably polish the workpiece. When the new polishing surface is worn again, the above-mentioned turning over and positioning operation can be repeated, and different grids can be alternately used.

[0045] As shown in Figure 1 , Figure 2 , Figure 3 The utility model discloses further include, the shape of positioning convex 6 and positioning recess 7 is mutually adapted.

[0046] In use, when two sponge layers 1 are relatively turned over under the action of flexible connecting portion 4, the mutually adapted positioning convex 6 and positioning recess 7 can play the accurate guiding role, and the positioning convex 6 will be embedded along the shape profile of the positioning recess 7, just like the two pieces of jigsaw mutually fit, guide two sponge layers 1 to accurately turn over to the predetermined position, ensure that the new polishing surface such as the first grid 2 of the original inside or the second grid 3 of the other side can accurately align the surface of the workpiece to be polished, avoid the positional deviation, thereby guarantee the accuracy and stability of polishing work;

[0047] Because the shape of positioning convex 6 and positioning recess 7 is mutually adapted, after two sponge layers 1 are turned over in place, they can realize the close fit, and the positioning convex 6 can be completely embedded in the positioning recess 7, and the gap between the two is extremely small, so that the relative displacement or shaking of two sponge layers 1 during polishing can be effectively prevented, and whether under normal polishing pressure or in some more complex polishing operation, the close fit can guarantee the structural stability of the sanding block, so that the polishing work can be continuously and uniformly carried out.

[0048] During the multiple use of the sanding block, the turning over operation of sponge layer 1 needs to be frequently carried out to alternately use different grids for polishing, and the mutual adaptation characteristics of positioning convex 6 and positioning recess 7 ensure that accurate positioning can be realized after each turning over, and as long as the operation is carried out according to the adapted shape, the two sponge layers 1 can always return to the correct relative position after turning over for any number of times, so that the normal use of the sanding block is guaranteed, and the overall service life is prolonged.

[0049] As shown in Figure 1 , Figure 2 , Figure 3 The utility model discloses further include, the edge of sponge layer 1 is equipped with sealing connecting portion 9.

[0050] In use, the sealing connecting portion 9 can form a relatively closed space between two sponge layers 1, prevent the dust, debris, abrasive and other foreign matters in the outside from entering the inside of sponge layer 1 and the connecting place of grid and sponge layer 1, which helps to keep the inside of the sanding block clean, avoid that the foreign matters cause the wear or damage of grid and sponge layer 1, thereby prolong the service life of the sanding block.

[0051] It can enhance the connection strength of the edges of the two sponge layers 1, so that the sanding block forms a more stable structure as a whole. During use, especially when the workpiece is polished, the sanding block will be subjected to various forces. The sealing connection part 9 can prevent the edges of the sponge layer 1 from separating or deforming due to stress, ensure that the shape and structure of the sanding block remain stable, and further ensure the consistency and reliability of the polishing effect.

[0052] As shown in Figure 1 , Figure 2 The first grid 2 and the second grid 3 are both provided with a sand layer 8 on the surface.

[0053] In use, the sand particles in the sand layer 8 have high hardness and sharpness. When the sanding block is in contact with the surface of the workpiece and pressure is applied for polishing, the sand particles will rub against the surface of the workpiece, removing burrs, oxidation layers, excess material, etc. on the surface of the workpiece through cutting, scraping, etc. to achieve the required flatness, smoothness and accuracy requirements of the workpiece surface. The grid structure of the first grid 2 and the second grid 3 uniformly distributes the sand layer 8 on the surface of the sponge layer 1, so that the sand particles can uniformly act on the surface of the workpiece during polishing, which helps to avoid uneven polishing and ensure the quality consistency of the workpiece surface, reducing the problem of excessive polishing or insufficient polishing in local areas.

[0054] The presence of the grid provides good support and fixation for the sand layer 8. The pores of the grid can accommodate sand particles, preventing them from easily falling off during polishing, so that the sand particles can continuously perform polishing. At the same time, the structure of the grid also allows the sand particles to maintain a relatively stable position when subjected to external forces, ensuring the stability and continuity of the polishing effect.

[0055] The sponge layer 1 has a certain elasticity and buffering effect, which can provide buffering for the sand layer 8 when the sanding block is in contact with the workpiece, reducing the breakage or falling off of sand particles caused by direct impact.

[0056] It needs to be explained that the utility model discloses a sponge composite grid sanding block structure, in the initial state, the second grid 3 of sanding block outside is used to the surface of workpiece with sand layer 8 polishing, when the outside second grid 3 is abraded, because two sponge layers 1 are connected by flexible rubber strip flexible connecting part 4, and flexible rubber strip has flexibility and elasticity, can allow two sponge layers 1 to be relatively overturned with its as the shaft, make two sponge layers 1 relatively overturn, the first grid 2 originally in the inside is overturned to the outside, after the sponge layer 1 is overturned in place, the positioning structure positioning table 5, positioning convex 6 and positioning recess 7 play the role, positioning convex 6 is accurately inserted into positioning recess 7, ensure that the first grid 2 is in the accurate position, make two sponge layers 1 steady fixed, prevent relative displacement, guarantee polishing precision and stability, the surface of the first grid 2 that is newly overturned to the outside has sand layer 8 and continues to polish workpiece, when the grid is abraded again, repeat the above-mentioned overturning and positioning operation, polish alternately using different grids, the sealing connecting part 9 of sanding block edge can form relatively closed space, prevent foreign matter from entering, keep inside clean, enhance the edge connection strength, the elasticity and buffer action of sponge layer 1 can reduce sand particle breakage or fall off, can also dissipate heat, guarantee sand layer 8 performance and workpiece surface quality, grid structure first grid 2 and second grid 3 evenly distribute sand layer 8, prevent sand particle easily fall off, ensure the stability and continuity of polishing effect.

[0057] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A sponge composite grid sanding block structure comprising two sponge layers (1) arranged on top of each other, characterized in that, The inner side of the two stacked sponge layers (1) is provided with a first grid (2), and the outer side of the two sponge layers (1) is provided with a second grid (3); the two sponge layers (1) are connected through a flexible connecting part (4) with flexibility and elasticity, and the flexible connecting part (4) enables the two sponge layers (1) to be relatively flipped; the side, away from the flexible connecting part (4), of the two sponge layers (1) is provided with two sets of flipping positioning structures.

2. A sponge composite mesh sanding block structure according to claim 1, wherein: The flexible connecting part (4) is a flexible rubber strip.

3. A sponge composite mesh sanding block structure according to claim 1, wherein: The flipping positioning structure comprises a positioning table (5) arranged on the sponge layer (1), the bottom end of the positioning table (5) at the lower part of one side of the two sponge layers (1) is provided with a positioning protrusion (6), and the top end of the positioning table (5) at the upper part of one side of the two sponge layers (1) is provided with a positioning groove (7).

4. A sponge composite mesh sanding block structure according to claim 3, wherein: The positioning protrusion (6) and the positioning groove (7) are mutually matched in shape.

5. A sponge composite mesh sanding block structure according to claim 1, wherein: The edge of the sponge layer (1) is provided with a sealing connecting part (9).

6. A sponge composite mesh sanding block structure according to claim 1, wherein: The surface of the first grid (2) and the second grid (3) is provided with a sand layer (8).

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