Sponge roller and sponge roller manufacturing method

Abstract

The invention discloses a sponge roller and a sponge roller manufacturing method.The sponge roller comprises a roller shaft core and roller sponge installed on the circumferential surface of the roller shaft core, the roller sponge is provided with a honeycomb-shaped sponge inner layer and a dense sponge surface layer attached to the surface of the sponge inner layer, and a plurality of exposed inner layer areas are distributed on the sponge surface layer; the exposed inner layer area and the sponge surface layer are not in the same plane; a plurality of grooves are distributed in the surface of the roller sponge in the circumferential direction, one side face of each groove and the surface of the roller sponge form a cleaning scraper which is matched with a cleaning face and provided with an acute-angle blade, and the section of each groove is in the shape that at least one side is contracted inwards. The grooves in the surface of the roller sponge can provide certain friction force, and meanwhile the grooves have good water absorption performance, so that the cleaning effect is good during cleaning.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 202111035100.4, with the invention title of "A Sponge Roller and Its Manufacturing Method", the content of which is incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of cleaning equipment, and particularly to a sponge roller and a manufacturing method thereof. Background Art

[0003] A roller is used on a cleaning device that combines mopping and sweeping, and this roller is usually a sponge roller made of PVA material. When in use, due to the characteristics of high density, high water absorption, low cost, and easy availability of the sponge roller made of PVA material, it is used as a cleaning component on the cleaning device that combines mopping and sweeping. After installation, through a specific mechanical structure, operations such as extrusion are performed on the roller to achieve the effect of repeated cleaning and reuse.

[0004] After the surface of the roller sponge is usually formed, since the roller sponge contacts the mold during forming, a dense surface layer is formed on the surface of the roller sponge, resulting in low water absorption rate during use. At the same time, the dense surface layer is smooth, which also affects the cleaning efficiency. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide a sponge roller and a manufacturing method thereof, wherein the sponge roller can avoid the dense sponge surface layer formed on the surface during the forming process of the roller sponge from affecting the water absorption rate and cleaning efficiency.

[0006] To solve the above technical problem, in a first aspect, the present invention provides a sponge roller, comprising:

[0007] A roller shaft core;

[0008] A roller sponge, installed on the circumferential surface of the roller shaft core. The roller sponge is provided with a honeycomb-shaped sponge inner layer and a dense sponge surface layer attached to the surface of the inner layer. A plurality of inner layer regions exposing the roller sponge are distributed on the surface layer, and the inner layer regions exposing the roller sponge are not in the same plane as the surface layer; a plurality of grooves are distributed along the circumferential direction on the surface of the roller sponge, and one side of each groove forms a cleaning scraper with an acute-edge blade that caters to the cleaning surface with the surface of the roller sponge, and the cross-section of the groove is in a shape of at least one side being inwardly converging.

[0009] In one or some embodiments, in the depth direction of the groove, the bottom of the groove is the sponge inner layer, the part of the side of the groove close to the root is the sponge inner layer, and the part of the side of the groove close to the surface of the roller sponge is the surface layer.

[0010] In one or some embodiments, a plurality of inner layer regions exposing the sponge are distributed on the sponge surface layer on the side surface of the groove.

[0011] In one or some embodiments, at least one side surface of the groove is an inclined surface, and the inclined surface forms an angle less than 90 degrees with the surface of the roller sponge.

[0012] In one or some embodiments, the grooves are uniformly distributed along the circumferential direction on the surface of the roller sponge.

[0013] In one or some embodiments, the depth of the groove is 1-2 mm, and the width of the groove is greater than 0.5 mm.

[0014] In one or some embodiments, the distance between two adjacent grooves is greater than 0.5 mm.

[0015] In one or some embodiments, the distance between two adjacent grooves is the same as the width of the groove.

[0016] In one or some embodiments, the cross-section of the groove is trapezoidal.

[0017] In one or some embodiments, the two side edges of the cross-section of the groove are parallel.

[0018] In one or some embodiments, the cross-section of the groove is triangular.

[0019] In one or some embodiments, the grooves are arranged in a spiral shape on the surface of the roller sponge.

[0020] In one or some embodiments, the direction in which the acute edge of the cleaning scraper scrapes the cleaning surface is consistent with the working rotation direction of the sponge roller.

[0021] In one or some embodiments, the inner layer regions exposing the roller sponge are uniformly distributed.

[0022] In one or some embodiments, the area of the grooves accounts for 1 / 4-1 / 2 of the circumferential surface of the roller sponge.

[0023] In one or some embodiments, the ratio of the inner layer region exposing the roller sponge to the surface area of the roller sponge is 1 / 4-1 / 2.

[0024] In a second aspect, the present invention further provides a method for manufacturing a sponge roller, which is characterized in that it is used to manufacture the sponge roller as described in the first aspect. The method for manufacturing the sponge roller includes:

[0025] A step of forming the roller sponge, in which a roller sponge is formed on the surface of a roller shaft core through a special mold;

[0026] The step of grinding the surface of the roller sponge of the sponge roller is to grind the dense sponge surface layer at intervals after the roller sponge is formed, so that part of the dense sponge surface layer is worn, and the inner layer area of the roller sponge is exposed;

[0027] The step of cutting the roller sponge of the sponge roller is to cut the roller sponge of the sponge roller after the surface is ground, and chamfer both ends of the sponge roller.

[0028] In one or some embodiments, the step of forming the roller sponge includes: first placing the roller shaft core in the sponge shaping sleeve, then fixing the roller shaft core through the left and right fixing covers and the first fixing step, and then fixing it to the sponge shaping sleeve through the second fixing step, so that the roller shaft core and the sponge shaping sleeve are coaxial, and the surface of the roller shaft core and the inner wall of the sponge shaping sleeve are evenly spaced. Then, a sponge material is injected into the cavity formed by the roller shaft core and the sponge shaping sleeve for foam molding, and a wavy arc surface structure is formed on the surface of the roller sponge.

[0029] In one or some embodiments, after the roller sponge is demolded, a dense surface layer with a thickness of 0.2 - 0.5 mm is formed on the surface.

[0030] In one or some embodiments, in the step of grinding the surface of the roller sponge of the sponge roller, the distance between adjacent inner layer areas of the roller sponge exposed on the surface of the roller sponge is 0.2 - 1.0 mm, and the area of the inner layer area of the roller sponge exposed is 0.002 - 0.01 square centimeters.

[0031] In one or some embodiments, in the step of cutting the roller sponge of the sponge roller, the chamfer length is 3 - 7 mm, and the range of the chamfer angle is 30 - 70 degrees.

[0032] A sponge roller of the present invention and a manufacturing method of the sponge roller, wherein the sponge roller includes a roller shaft core and a roller sponge installed on the circumferential surface of the roller shaft core. The roller sponge is provided with a honeycomb-shaped sponge inner layer and a dense sponge surface layer attached to the surface of the honeycomb-shaped sponge inner layer. A plurality of inner layer areas exposing the sponge inner layer are distributed on the dense sponge surface layer. When in use, since the surface of the roller sponge is provided with grooves, and since a plurality of inner layer areas exposing the sponge inner layer are distributed on the dense sponge surface layer on the side of the groove, the existence of the inner layer areas exposing the sponge inner layer makes the surface of the roller sponge have fine grooves, which can provide a certain frictional force, but will not generate a large frictional force and large noise, taking into account the balance of cleaning effect, noise and service life. At the same time, the bottom of the groove is the sponge inner layer, which has good water absorption. Therefore, during cleaning, especially when cleaning the liquid surface, the cleaning effect is good. A cleaning scraper structure is formed at the junction of the surface of the roller sponge and the groove. During the molding process, the sponge surface at this junction is relatively dense, and has a good cleaning effect on cleaning stubborn garbage. Brief Description of the Drawings

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the description only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0034] Figure 1 Structural schematic diagram of the sponge roller embodiment of the present invention.

[0035] Figure 2 Structural schematic diagram of the surface of the existing roller sponge.

[0036] Figure 3 Enlarged schematic diagram of the surface structure of the roller sponge embodiment of the present invention.

[0037] Figure 4 Structural schematic diagram of the cross-section of the roller sponge of the present invention along the vertical direction of the length of the roller sponge.

[0038] Figure 5 Structural schematic diagram of another embodiment of the sponge roller of the present invention.

[0039] Figure 6 Structural schematic diagram of yet another embodiment of the sponge roller of the present invention.

[0040] Figure 7 For Figure 6 Enlarged schematic diagram of the structure of part A in

[0041] Figure 8 Flow schematic diagram of the embodiment of the method for forming the roller sponge of the present invention.

[0042] Figure 9a Structural schematic diagram of the surface of the roller sponge after being polished after forming of the present invention.

[0043] Figure 9b Enlarged 20-fold schematic diagram of the surface of the roller sponge after being polished after forming of the present invention.

[0044] Figure 9c Enlarged 100-fold schematic diagram of the surface of the roller sponge after being polished after forming of the present invention.

[0045] Figure 9d Enlarged 200-fold schematic diagram of the surface of the roller sponge after being polished after forming of the present invention.

[0046] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed Description of the Embodiments

[0047] The following further elaborates on the claims of the present invention in conjunction with specific embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts also fall within the scope of protection of the present invention.

[0048] It should be understood that in the description of the embodiments of the present invention, all terms of directional indication, such as "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present invention is normally placed during use. It is only for the convenience of simplifying the description of the present invention, rather than explicitly or implicitly indicating that the device, element or component must have a specific orientation and a specific orientation structure. It should not be construed as a limitation to the present invention. It is only used to explain the relative positional relationship and movement situation between the components under the shown drawings. When the specific posture changes, the directional indication may also change accordingly.

[0049] In addition, the ordinal numbers in the present invention, such as "first", "second", etc., are only used for distinguishing purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the technical features indicated. Thus, the features defined by "first" and "second" may explicitly or implicitly include at least one of such technical features. In the description of the present invention, the meaning of "a plurality" is at least two, that is, two or more, unless otherwise clearly defined; the meaning of "at least one" is one or more.

[0050] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "setting", "connection", "fixation", "rotation connection", etc. should be understood in a broad sense. For example, it can be either that the positional relationship between components is relatively fixed, or that there is a physically fixed connection between components. It can be either a detachable connection or an integral structure; it can be either a mechanical connection or an electrical signal connection; it can be either directly connected or indirectly connected through an intermediate medium or component; it can be either the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined in the specification, when other understandings cannot achieve the corresponding functions or effects, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] If the controller and control circuit involved in the present invention are conventional control technologies or units in the art, for example, the control circuit of the controller can be implemented by ordinary technicians in the art using existing technologies, such as simple programming. For software or programs that cooperate with hardware to achieve control results, if the description does not provide detailed explanations regarding the control process of the software or program involved, it belongs to the use of existing technologies or the conventional technologies of ordinary technicians in the art. The power supply also belongs to the existing technologies in the art. Since the main inventive technical point of the present invention lies in the improvement of the mechanical device, the specific circuit control relationships and circuit connections of the present invention will not be described in detail herein.

[0052] The disclosure of the present invention provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described in the present invention. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0053] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0054] As Figure 1 shown in FIG. -8, the present invention provides an embodiment of a sponge roller.

[0055] The sponge roller includes a roller shaft core 1 and a roller sponge 2 mounted on the circumferential surface of the roller shaft core 1. The roller sponge 2 is provided with a honeycomb sponge inner layer 22 and a dense sponge surface layer 20 attached to the surface of the honeycomb sponge inner layer. A plurality of inner layer regions 201 exposing the sponge inner layer 22 are distributed on the dense sponge surface layer 20.

[0056] Specifically, the inner layer regions 201 exposing the sponge inner layer 22 are usually not in the same plane as the dense sponge surface layer 20. The inner layer regions 201 exposing the sponge inner layer are preferably evenly distributed, so as to ensure that when in use, the frictional forces on the contact surface between the roller sponge and the cleaning surface are basically the same, thereby avoiding inconsistent frictional forces during use, which may cause fluctuations in the operation of the motor and thus affect the service life.

[0057] Through experiments, the area ratio of the inner layer region 201 where the inner layer of the sponge is exposed to the surface layer 20 of the roller sponge is 1 / 4 - 1 / 2. The distance between adjacent inner layer regions 201 where the inner layer of the sponge is exposed on the surface of the roller sponge is 0.2 - 1.0 mm, and the area of the inner layer region 201 where the inner layer of the roller sponge is exposed is 0.002 - 0.01 square centimeters, which well balances the cleaning effect, noise, and service life.

[0058] During use, since the surface of the roller sponge is provided with grooves 21, and since a plurality of inner layer regions 201 where the inner layer of the sponge is exposed are distributed on the dense surface layer 20 on the side surface of the groove, the existence of the inner layer region 201 where the inner layer of the sponge is exposed makes the surface of the roller sponge have fine grooves, which can provide a certain amount of friction but not generate too much friction and large noise, thus balancing the cleaning effect, noise, and service life. At the same time, the bottom of the groove is the inner layer of the sponge, which has good water absorption. Therefore, during cleaning, especially when cleaning the surface of a liquid, the cleaning effect is good.

[0059] According to needs, the groove 21 can be set to be spiral, arc-shaped, or triangular, and through experiments, it has a better cleaning effect.

[0060] To improve the cleaning effect, the grooves 21 are evenly distributed along the circumferential direction on the surface of the roller sponge. As Figure 5 and Figure 6 shown. One side surface 211 of the groove 21 forms a cleaning scraper 23 with the surface 20 of the roller sponge. At least one side surface 211 of the groove 21 is an inclined surface, and the inclined surface forms an angle less than 90 degrees with the surface 20 of the roller sponge. Through experiments, the cleaning scraper 23 structure formed in this way has better cleaning ability for stubborn garbage. The cleaning scraper 23 conforms to the cleaning surface, that is, the direction of the cleaning scraper 23 is consistent with the working rotation direction F of the sponge roller.

[0061] According to needs, the cross-section of the groove 21 can also be set to be trapezoidal or the two side edges are parallel.

[0062] Through experiments, when the area of the groove 21 accounts for 1 / 4 - 1 / 2 of the circumferential surface of the roller sponge, its cleaning effect is the best.

[0063] The grooves 21 are evenly distributed along the length direction of the surface of the roller sponge 2, and the number thereof is set according to needs, such as setting several. Since the two side surfaces of the groove 21 can be set to be perpendicular or approximately perpendicular, a cleaning scraper 23 can be formed at the intersection contact surface between the surface 20 of the roller sponge 2 and the side surface 211. Since the roller sponge 2 forms a relatively dense structure when in contact with the mold during molding, specifically a dense sponge surface layer 20, during cleaning, the cleaning scraper 23 forms a good cutting effect on the stubborn garbage on the cleaning surface, improving the effect of cleaning stubborn garbage.

[0064] At the same time, since there is a cavity inside the groove 21, the liquid on the cleaning surface can be scraped away, and it can also adapt to the scenario where there is more liquid on the cleaning surface. When combined with the inner layer regions 201 where multiple sponge inner layers 22 are exposed on the dense surface layer 20 of the surface of the roller sponge 2, it has a better cleaning effect when the cleaning surface has more liquid. In addition, granular solids can be collected through the groove 21, avoiding the situation where when there are mixed places with granular and powdery garbage, due to the presence of granular garbage, the surface of the roller sponge cannot contact the cleaning surface or the contact surface is small, so that the granular and other powdery garbage cannot be cleaned up together at one time, thereby improving the cleaning efficiency.

[0065] Such as Figure 8 - Figure 9d As shown, the present invention also provides an embodiment of a method for manufacturing a sponge roller.

[0066] The method for manufacturing the sponge roller includes:

[0067] Step S10, the step of forming the roller sponge, forming the roller sponge on the surface of the roller shaft core through a special mold;

[0068] Step S11, the step of polishing the surface of the sponge roller, polishing the dense surface layer at intervals when the roller sponge is formed, so that part of the dense surface layer 20 is worn, and the region 201 of the inner layer of the roller sponge is exposed;

[0069] Step S12, the step of cutting the sponge roller, cutting the sponge roller whose surface has been polished, and chamfering the two ends of the sponge roller.

[0070] Specifically, in the step of forming the roller sponge, first place the roller shaft core in the sponge shaping sleeve, then fix the roller shaft core through the left and right fixing covers and the first fixing step, and then fix it with the sponge shaping sleeve through the second fixing step, so that the roller shaft core and the sponge shaping sleeve are coaxial, and the surface of the roller shaft core and the inner wall of the sponge shaping sleeve are evenly spaced. Then inject sponge material, such as PVA material, into the cavity (mold cavity) formed by the roller shaft core and the sponge shaping sleeve for foam molding, and form a wavy arc surface structure on the surface of the roller sponge.

[0071] During the process of forming the sponge in the sponge shaping sleeve, due to the contact surface between the sponge and the mold cavity of the sponge shaping sleeve, a smooth and dense sponge surface layer 20 is formed on the surface of the roller sponge, such as Figure 2 shown. Since the smooth and dense sponge surface layer 20 on the surface of the roller sponge has a small friction force, it cannot effectively clean the cleaning surface.

[0072] After the roller sponge is demolded, a film skin with a thickness of 0.2 - 0.5 mm is formed on the surface, which is the dense sponge surface layer 20. The film skin, that is, the dense sponge surface layer 20, is polished at intervals, which we will simply refer to as "skin grinding" in the following parts of this specification. This skin grinding solves two problems: increasing the contact area with the ground, and under the same unit pressure, the friction force becomes larger, exceeding the friction force required for normal mopping and cleaning; at the same time, due to the certain thickness and strong tension of the sponge surface, the sponge inner layer 22 inside the roller sponge will be squeezed into a closed space, restricting the elasticity of some of the materials themselves. When the roller sponge works, it needs to continuously squeeze the roller sponge, so the rebound speed and service life requirements are relatively high. Through grinding, the elasticity can also be released to improve the overall performance.

[0073] Before the sponge roller cutting in step S12, the surface of the roller sponge is polished, that is, step S12, so that part of the sponge surface layer 20 of the roller sponge is worn, and an inner layer area 201 where the sponge inner layer 22 is exposed is formed on the sponge surface layer 20 of the roller sponge, as Figures 9a - 9d shown. It can further reduce the surface friction of the roller sponge and increase the ability to carry garbage, thereby further improving the cleaning efficiency.

[0074] Through experiments, the area ratio of the inner layer area 201 where the sponge inner layer 22 is exposed to the roller sponge surface layer 20 is 1 / 4 - 1 / 2. The distance between adjacent inner layer areas 201 where the sponge inner layer 22 is exposed on the roller sponge surface is 0.2 - 1.0 mm, and the area of the inner layer area 201 where the sponge inner layer 22 is exposed is 0.002 - 0.01 square centimeters, which well balances the cleaning effect, noise, and service life.

[0075] In the surface polishing step of the sponge roller, the distance between the inner layer areas 201 where the sponge inner layer 22 is exposed is 0.2 - 1.0 mm. The chamfer length is 3 - 7 mm, and the range of the chamfer angle is 30 - 70 degrees.

[0076] In step S10, in the roller sponge forming step, grooves 21 can be formed on the surface of the roller sponge. The grooves 21 are evenly distributed along the length direction of the roller sponge surface, and the number thereof can be set as needed, such as setting several. Since the two sides of the groove 21 can be set to be perpendicular or approximately perpendicular, a cleaning blade 23 can be formed at the contact surface between the surface of the roller sponge 2 and the side surface 211. Since the roller sponge 2 forms a relatively dense structure when in contact with the mold surface during forming, during cleaning, the cleaning blade 23 can form a good cutting effect on the stubborn garbage on the cleaning surface, as Figure 6As shown, when the roller sponge 2 rotates in the F direction, the cleaning scraper 23 can form a scraping effect with the cleaning surface, enabling stubborn garbage to be cleaned. Even if it cannot be completely cleaned, larger stubborn garbage can be cleaned by cutting, thereby improving the effect of cleaning stubborn garbage. As needed, the groove 21 can be set to be spiral, arc-shaped or triangular, and through experiments, it has a better cleaning effect. Further, as Figure 6 shown, one side surface 211 of the groove 21 forms a cleaning scraper 23 with an acute-edge that caters to the cleaning surface with the surface of the roller sponge 2, and the cross-section of the groove 21 is in a shape with at least one side being inwardly converging.

[0077] As Figures 5 to 7 shown, at the same time, since there is a cavity inside the groove 21, the liquid on the cleaning surface can be scraped away, and it can also adapt to the scenario where there is more liquid on the cleaning surface. In cooperation with the distribution of a plurality of exposed sponge inner layer 22 regions 201 on the dense sponge surface layer 20 of the roller sponge 2 surface, it has a better cleaning effect when the cleaning surface has more liquid. In addition, granular solids can be collected through the groove 21 to avoid the situation where, in a place where there are mixed granular and powdery garbage, due to the presence of granular garbage, the surface of the roller sponge cannot contact the cleaning surface or the contact surface is small, so that the granular and other powdery garbage cannot be cleaned together at one time. Therefore, setting the groove 21 on the surface of the roller sponge 2 can improve the cleaning efficiency.

[0078] As needed, the groove 21 can be set to have a trapezoidal cross-section or a structure with one side being an inclined surface, which can improve the cleaning effect of the cleaning scraper 23 and also have a better ability to transport liquid or granular solids during the cleaning process. The depth of the groove 21 is 1 - 2 mm, the width of the groove 23 is greater than 0.5 mm. Moreover, the width between two adjacent grooves 21 is greater than 0.5 mm. Through experiments, such a setting has a better cleaning effect, taking into account the cleaning efficiency and the service life of the roller sponge 2 surface. And making the distance between two adjacent grooves 21 the same as the width of the groove 31 also has a good cleaning effect and wear resistance.

[0079] As needed, the area of the groove 21 accounts for 1 / 4 - 1 / 2 of the circumferential surface of the roller sponge. The groove is spiral, arc-shaped or strip-shaped along the length direction of the roller sponge. Among them, through experiments, the spiral and arc shapes can have only partial contact on the cleaning contact surface during cleaning, which can reduce the working load of the motor on the roller and at the same time does not affect the cleaning effect, having a better effect.

[0080] At least one side of the groove 21 is an inclined surface, and the inclined surface forms an angle less than 90 degrees with the surface of the roller sponge.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sponge roller, characterized in that, Comprising: Roller shaft core; Roller sponge, installed on the circumferential surface of the roller shaft core. The roller sponge is provided with a honeycomb sponge inner layer and a dense sponge surface layer attached to the surface of the sponge inner layer. A plurality of inner layer areas exposing the roller sponge are distributed on the sponge surface layer, and the inner layer areas exposing the roller sponge are not in the same plane as the sponge surface layer; a plurality of grooves are distributed along the circumferential direction on the surface of the roller sponge, and one side of each groove forms a cleaning scraper with an acute angle blade that conforms to the cleaning surface with the surface of the roller sponge, and the cross-section of the groove is in a shape of at least one side being inwardly converging.

2. The sponge roller according to claim 1, wherein, In the depth direction of the groove, the bottom of the groove is the sponge inner layer, the part of the side of the groove close to the root is the sponge inner layer, and the part of the side of the groove close to the surface of the roller sponge is the sponge surface layer; Preferably, a plurality of the inner layer areas exposing the sponge are distributed on the sponge surface layer of the side of the groove; Preferably, at least one side of the groove is an inclined surface, and the inclined surface forms an angle less than 90 degrees with the surface of the roller sponge; Preferably, the grooves are evenly distributed along the circumferential direction on the surface of the roller sponge; Preferably, the depth of the groove is 1 - 2 mm, and the width of the groove is greater than 0.5 mm; Preferably, the distance between two adjacent grooves is greater than 0.5 mm.

3. The sponge roller according to claim 1, characterized in that The distance between two adjacent grooves is the same as the width of the groove.

4. The sponge roller according to claim 1, wherein, The cross-section of the groove is trapezoidal.

5. The sponge roller according to claim 1, characterized in that, The two side edges of the cross-section of the groove are parallel.

6. The sponge roller according to claim 1, characterized in that, The cross-section of the groove is triangular.

7. The sponge roller according to claim 1, characterized in that, The grooves are arranged in a spiral shape on the surface of the roller sponge.

8. The sponge roller according to any one of claims 1-7, characterized in that, The direction in which the acute angle blade of the cleaning scraper scrapes the cleaning surface is consistent with the working rotation direction of the sponge roller; Preferably, the inner layer areas exposing the roller sponge are evenly distributed; Preferably, the area of the groove accounts for 1 / 4 - 1 / 2 of the circumferential surface of the roller sponge.

9. The sponge roller according to any one of claims 1-7, characterized in that, The ratio of the area of the inner layer areas exposing the roller sponge to the surface area of the roller sponge is 1 / 4 - 1 / 2.

10. A method for manufacturing a sponge roller, characterized in that, For manufacturing the sponge roller as described in any one of claims 1 - 9, the manufacturing method of the sponge roller includes: Roller sponge forming step, forming the roller sponge on the surface of the roller shaft core through a special mold; Surface grinding step of the roller sponge of the sponge roller, intermittently grinding the dense sponge surface layer after the roller sponge is formed, so that part of the dense sponge surface layer is worn, exposing the inner layer area of the roller sponge; Roller sponge cutting step of the sponge roller, cutting the roller sponge of the sponge roller whose surface has been ground, and chamfering both ends of the sponge roller; Preferably, the roller sponge forming step includes: first placing the roller shaft core in the sponge shaping sleeve, then fixing the roller shaft core through the left and right fixing covers and the first fixing step, and then fixing with the sponge shaping sleeve through the second fixing step, so that the roller shaft core and the sponge shaping sleeve are coaxial, and the distance between the surface of the roller shaft core and the inner wall of the sponge shaping sleeve is uniform. Then, injecting sponge material into the cavity formed by the roller shaft core and the sponge shaping sleeve for foam molding to form a wavy arc surface structure on the surface of the roller sponge; Preferably, after the roller sponge is demolded, a dense surface layer with a thickness of 0.2 - 0.5 mm is formed on the surface; Preferably, in the step of polishing the surface of the roller sponge of the sponge roller, the distance between adjacent inner layer regions of the roller sponge exposed on the surface of the roller sponge is 0.2-1.0 mm, and the area of the inner layer region of the roller sponge exposed is 0.002-0.01 square centimeters; Preferably, in the step of cutting the roller sponge of the sponge roller, the chamfer length is 3-7 mm, and the range of the chamfer angle is 30-70 degrees.

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