A sand-spreading roller, its manufacturing method, and a sand-spreading device.

Abstract

This invention discloses a loose sand roller brush, its manufacturing method, and a sand-laying device, belonging to the field of 3D printing technology. The loose sand roller brush includes: a tubular roller shaft with multiple hole structures on its wall, including a pair of first through holes and several second through holes; a bristle assembly comprising multiple bristle units corresponding to the multiple hole structures; each bristle unit includes at least one first bristle bundle and several second bristle bundles. The first bristle bundle passes through the roller shaft through the pair of first through holes, and its two ends extend out of the roller shaft from the first through holes. Each second bristle bundle is correspondingly disposed in a second through hole, and the second bristle bundle has a connecting end extending into the roller shaft, the connecting end being connected to the portion of the first bristle bundle located inside the roller shaft. The manufacturing method is used to manufacture the aforementioned loose sand roller brush. The sand-laying device includes the aforementioned loose sand roller brush. The bristles are less prone to loosening and falling off, extending the service life of the roller brush, reducing the frequency of parts replacement, and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and in particular to a sand-spreading roller, its manufacturing method, and a sand-spreading device. Background Technology

[0002] In existing technologies, equipment requiring the spreading of sand particles, such as sand mold 3D printers, typically includes a sand-spreading device with a roller brush to break up clumps of sand particles during the spreading process. However, in existing technologies, the brush bristles are mostly made of flexible materials such as nylon, plastic, or natural fibers. When used to break up sand particles, the bristles are in continuous contact with hard sand particles, which can easily lead to wear or breakage, resulting in a decreased spreading effect. Furthermore, as the roller brush rotates, the bristles tend to detach from the roller shaft under centrifugal force, causing them to loosen and fall off easily. This results in a short lifespan for the roller brush, a high frequency of parts replacement, and is detrimental to improving production efficiency. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a sand-spreading roller, a manufacturing method, and a sand-spreading device.

[0004] According to a first aspect of the present invention, a sand-spraying roller includes: A roller shaft has a hollow tubular structure, and the tube wall of the roller shaft is provided with a plurality of hole structures, the hole structures including at least a pair of first through holes and a plurality of second through holes; A tuft assembly is mounted on the roller shaft. The tuft assembly includes a plurality of tuft units corresponding one-to-one with the plurality of hole structures. Each tuft unit includes at least one first tuft and a plurality of second tufts. The first tuft passes through the roller shaft through a pair of first through holes, and its two ends extend out of the roller shaft from the first through holes. The middle part of the first tuft is located inside the roller shaft. The number of second tufts corresponds to the number of second through holes. Each second tuft is correspondingly disposed in one of the second through holes. The second tuft has a connecting end that extends into the roller shaft. The connecting end is connected to the portion of the first tuft located inside the roller shaft.

[0005] According to the first aspect of the present invention, the loose sand roller brush has at least the following technical effects: by setting the first bristle bundle to pass through two first through holes, when the loose sand roller brush rotates, the centrifugal forces at both ends of the first bristle bundle are in opposite directions and cancel each other out, preventing the first bristle bundle from detaching from the roller shaft under the action of centrifugal force; by setting the second bristle bundle to connect with the first bristle bundle, the centrifugal force on the second bristle bundle is borne by the first bristle bundle, and the first bristle bundle plays a pulling role on the second bristle bundle, thereby preventing the second bristle bundle from detaching from the roller shaft under the action of centrifugal force; the bristles are not easy to loosen and fall off, extending the service life of the roller brush, reducing the replacement frequency of parts, and helping to improve production efficiency.

[0006] According to some embodiments of the present invention, the second hair bundle is folded along its length to form two free segments arranged side by side, and a bent segment connecting the two free segments, wherein the connecting end is located on the side of the bent segment away from the two free segments.

[0007] According to some embodiments of the present invention, a second bundle of wire is connected between the first hair bundle and the bent section. The second bundle of wire has a first binding portion and a second binding portion. The first binding portion is bound to the first hair bundle, and the second binding portion is bound to the second hair bundle at the connecting end.

[0008] According to some embodiments of the present invention, both the first hair bundle and the second hair bundle are steel wire bundles.

[0009] According to some embodiments of the present invention, each of the two first through holes has a shoulder at one end facing away from each other, and a first bundle of thread straps bound to the first hair bundle is provided in the shoulder.

[0010] According to some embodiments of the present invention, the first hair bundle extends radially along the roller shaft, the number of the second hair bundles is even, and a plurality of the second hair bundles are evenly distributed on both sides of the first hair bundle in a direction that is perpendicular to both the first hair bundle and the roller shaft.

[0011] According to a second aspect of the present invention, a method for manufacturing a loose sand roller brush is used to manufacture the aforementioned loose sand roller brush. The manufacturing method includes the following steps: A roller shaft is provided, wherein the roller shaft has a plurality of the hole structures; Fold the second tuft of hair in half to form a bent section; The bent section is inserted from the outside of the roller shaft into the inside of the roller shaft through the second through hole; The first hair bundle is passed through one of the first through holes and the other first through hole in sequence, and the bent section of the second hair bundle is fixedly connected to the middle part of the first hair bundle.

[0012] According to the second aspect of the present invention, the method for manufacturing a loose sand roller brush has at least the following technical effects: using the manufacturing method of the present invention to manufacture a loose sand roller brush makes the bristles less prone to loosening and falling off, extends the service life of the roller brush, reduces the frequency of parts replacement, and helps to improve production efficiency.

[0013] According to some embodiments of the present invention, the manufacturing method further includes: After the bending section is formed, a second bundle of wire is provided, and a second binding portion of the second bundle of wire is bound to the bending section, with the first binding portion of the second bundle of wire located on the side of the second binding portion away from the bending section; The step of inserting the bent section from the outside of the roller shaft through the second through hole into the inside of the roller shaft includes: The second bundle of wires, together with the bent section, is inserted from the outside of the roller shaft through the second through hole into the inside of the roller shaft, and the first binding part is positioned between the two first through holes; The step of sequentially passing the first hair bundle through one of the first through holes and the other first through hole, and fixing the bent section of the second hair bundle to the middle part of the first hair bundle, includes: The first hair bundle is passed sequentially through one of the first through holes, the first binding part, and the other first through hole, so that the first hair bundle cooperates with the first binding part, and the two ends of the first hair bundle extend out of the roller shaft through the two first through holes respectively.

[0014] According to some embodiments of the present invention, the manufacturing method further includes: rotating the second bundle of hair so that the second binding part rotates relative to the first binding part to tighten the second bundle of thread.

[0015] According to a third aspect of the present invention, a sand-spreading device includes the aforementioned sand-spreading roller.

[0016] According to the third aspect of the present invention, the sand spreading device has at least the following technical effects: by setting the above-mentioned sand spreading roller brush, the brush bristles are not easy to loosen and fall off, the service life of the roller brush is extended, the replacement frequency of parts is reduced, and production efficiency is improved.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a three-dimensional structural schematic diagram of the sand-spreading roller brush according to an embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of the roller shaft in one embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of the sand roller brush according to an embodiment of the present invention; Figure 4 This is a flowchart of the method for manufacturing a loose sand roller brush according to an embodiment of the present invention; Figure 5 This is a flowchart of a method for manufacturing a loose sand roller brush according to another embodiment of the present invention.

[0019] In the attached image: 100-Roller; 101-Rotating shaft; 110-First through hole; 111-Hole shoulder; 120-Second through hole; 200-Wool bundle unit; 210-First wool bundle; 211-First bundle of wire; 220-Second wool bundle; 221-Bending section; 222-Free section; 223-Connecting end; 230-Second bundle of wire; 231-Second binding part; 232-Twisted connection part; 233-First binding part. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the invention and for simplifying the description, and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number, while "above," "below," "within," etc., are understood to include the stated number. If "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] The following is for reference. Figures 1 to 5 This invention describes a sand-spreading roller, its manufacturing method, and its sand-spreading device according to embodiments of the present invention.

[0024] The sand-spreading roller brush of the first aspect of the present invention includes a roller 100 and a bristle assembly.

[0025] Reference Figure 1 and Figure 2The roller 100 has a hollow tubular structure. The tube wall of the roller 100 is provided with multiple hole structures. The multiple hole structures are arranged sequentially along the axial direction of the roller 100. The hole structure includes at least one pair of first through holes 110 and several second through holes 120. The first through holes 110 and the second through holes 120 both penetrate the tube wall of the roller 100. The two first through holes 110 are coaxial. Furthermore, the roller 100 can be a transversely extending circular tube. The two ends of the roller 100 are respectively provided with rotating shafts 101 for installation to the sand spreading device. The roller 100 is coaxial with the two rotating shafts 101.

[0026] The tuft assembly is mounted on the roller 100. The tuft assembly includes multiple tuft units 200 corresponding one-to-one with multiple hole structures. The multiple tuft units 200 are disposed one-to-one with the multiple hole structures. Each tuft unit 200 includes at least one first tuft 210 and a plurality of second tufts 220. The first tuft 210 passes through the roller 100 through a pair of first through holes 110, and its two ends extend out of the roller 100 through the first through holes 110 respectively. The middle part of the first tuft 210... Inside the roller 100, the first hair bundle 210 passes through the two first through holes 110 and both ends of the first hair bundle 210 protrude from the two first through holes 110 respectively; the number of second hair bundles 220 corresponds to the number of second through holes 120, and each second hair bundle 220 is correspondingly disposed in a second through hole 120. The second hair bundle 220 has a connecting end 223 extending into the inside of the roller 100, and the connecting end 223 is connected to the part of the first hair bundle 210 located inside the roller 100.

[0027] By setting the first bristle bundle 210 to pass through the two first through holes 110, when the sand-spreading roller brush rotates, the centrifugal forces at both ends of the first bristle bundle 210 are in opposite directions and cancel each other out, preventing the first bristle bundle 210 from detaching from the roller shaft 100 under the action of centrifugal force; the setting of the second bristle bundle 220 avoids the problem of the bristles on the roller shaft 100 being too sparse; by setting the second bristle bundle 220 to be connected to the first bristle bundle 210, the centrifugal force on the second bristle bundle 220 is borne by the first bristle bundle 210, and the first bristle bundle 210 plays a pulling role on the second bristle bundle 220, achieving This design prevents the second bristle bundle 220 from detaching from the roller shaft 100 under centrifugal force. Furthermore, the tension from the second bristle bundle 220 received by the first bristle bundle 210 is not directed along the axial direction of the first through hole 110, thus preventing the first bristle bundle 210 from falling off. The structure is reasonable and facilitates a stable connection between the first bristle bundle 210, the second bristle bundle 220, and the roller shaft 100. The bristles of the first bristle bundle 210 and the second bristle bundle 220 are not easily loosened or detached, extending the service life of the roller brush, reducing the frequency of parts replacement, and improving production efficiency.

[0028] In some embodiments of the present invention, the second hair bundle 220 is folded along its length to form two free segments 222 arranged side by side, and a bent segment 221 connecting the two free segments 222. The connecting end 223 is located on the side of the bent segment 221 away from the two free segments 222. The bent segment 221 passes through the second through hole 120 from the outside to the inside and is connected to the first hair bundle 210. After the second hair bundle 220 is folded into a "V" shape, it is inserted into the second through hole 120. After the bent segment 221 is inserted into the second through hole 120, the two free segments 222 on its two wings will naturally spring outward, forming a tight fit with the hole wall, further preventing it from falling off.

[0029] In some embodiments of the present invention, reference is made to... Figure 3 A second bundle of wire 230 connects the first bristle bundle 210 and the bent section 221. The second bundle of wire 230 has a first binding part 233 and a second binding part 231. The first binding part 233 is bound to the first bristle bundle 210, and the second binding part 231 is bound to the second bristle bundle 220 at the connecting end 223. This facilitates the connection between the first bristle bundle 210 and the second bristle bundle 220. At the same time, the second binding part 231 can bind the second bristle bundle 220 into a stable structure to prevent the bristles from dispersing, tilting, or falling off due to stress during use. The second bundle of wire 230 can be made of steel wire.

[0030] In some embodiments of the present invention, both the first bristle bundle 210 and the second bristle bundle 220 are steel wire bundles. A steel wire bundle includes multiple steel bristles, which are gathered together; the steel bristles are slender strips made of stainless steel or other suitable metal materials. Steel wire bundles have high hardness and excellent wear resistance, effectively resisting the continuous friction and impact of sand particles, solving the problem of easy wear and breakage of conventional bristles, and significantly improving service life.

[0031] In some embodiments of the present invention, each of the two first through holes 110 has a shoulder 111 at one end facing away from each other. That is, the shoulder 111 of the two first through holes 110 is provided on the outer wall of the roller 100, and a first bundle of wire 211 is provided inside the shoulder 111 to bind the first bristle bundle 210. The first bundle of wire 211 can tightly bind multiple steel wire bristles into a stable bristle bundle, effectively preventing the steel wire bristles from dispersing, tilting or falling off due to force during use. At the same time, the first bundle of wire 211 also acts as a retaining spring to prevent the first bristle bundle 210 from moving and falling off along the axial direction of the first through hole 110; wherein, the first bundle of wire 211 can be steel wire.

[0032] In some embodiments of the present invention, the first hair bundle 210 extends radially along the roller shaft 100, and the number of second hair bundles 220 is even. Multiple second hair bundles 220 are evenly distributed on both sides of the first hair bundle 210 in a direction perpendicular to both the first hair bundle 210 and the roller shaft 100. In some hair bundle units 200, the first hair bundle 210 is vertically arranged, and the number of second hair bundles 220 can be four, with two second hair bundles 220 located on the front side of the first hair bundle 210 and the other two on the rear side of the first hair bundle 210. This ensures that the first hair bundle 210 is subjected to balanced forces on both sides, resulting in a stable structure that is less prone to loosening.

[0033] A method for manufacturing a loose sand roller brush according to a second aspect of the present invention, used to manufacture the aforementioned loose sand roller brush, refers to... Figure 4 The production method includes the following steps: Step S100: A roller 100 is provided, and the roller 100 has a plurality of hole structures.

[0034] In step S200, the second hair bundle 220 is folded in half to form a bent section 221.

[0035] In step S300, the bent section 221 is inserted from the outside of the roller 100 through the second through hole 120 into the inside of the roller 100.

[0036] In step S400, the first hair bundle 210 is passed through one of the first through holes 110 and the other first through hole 110 in sequence, and the bent section 221 of the second hair bundle 220 is fixedly connected to the middle part of the first hair bundle 210.

[0037] Using the manufacturing method of this invention to produce a loose sand roller brush can prevent the bristles from loosening and falling off, extend the service life of the roller brush, reduce the frequency of parts replacement, and help improve production efficiency.

[0038] In some embodiments of the present invention, reference is made to... Figure 5 The production method also includes the following steps: In step S210, after forming the bent section 221, a second bundle of wire 230 is provided, and the second binding part 231 of the second bundle of wire 230 is bound to the bent section 221, and the first binding part 233 of the second bundle of wire 230 is located on the side of the second binding part 231 away from the bent section 221; that is, the first binding part 233, the second binding part 231, and the second bundle of wire 220 are arranged sequentially along the axial direction of the second through hole 120.

[0039] The above step S300 specifically includes: In step S310, the second bundle of wire 230, together with the bent section 221, is inserted from the outside of the roller 100 through the second through hole 120 into the inside of the roller 100, and the first binding part 233 is positioned between the two first through holes 110.

[0040] The above step S400 specifically includes: In step S410, the first hair bundle 210 is passed sequentially through one of the first through holes 110, the first binding part 233, and the other first through hole 110, so that the first hair bundle 210 and the first binding part 233 cooperate. The two ends of the first hair bundle 210 extend out of the roller shaft 100 through the two first through holes 110 respectively, and the length of the two ends of the first hair bundle 210 protruding from the roller shaft 100 is the same.

[0041] In step S410, a plastic strip or other auxiliary object can be used to tie one end of the first hair bundle 210 so that it can pass through the first through hole 110 and the first binding part 233. After it is completely passed through, the auxiliary object can be removed.

[0042] It is understandable that the space inside the roller 100 is small, making it difficult to use conventional tools to connect the first bristle bundle 210 and the second bristle bundle 220 when assembling the loose sand roller brush. This invention, by providing a second bundle of wire 230, allows the operator to perform all operations outside the roller 100 during assembly, eliminating the need for specialized tools to reach inside the roller 100, thus facilitating assembly.

[0043] In some embodiments of the present invention, the manufacturing method further includes the following steps: Step S500, providing a first bundle of wire 211, and binding the first bundle of wire 211 to the shoulder 111 of the first through hole 110. This further secures the first bundle of hair 210; of course, the portions of the first bundle of hair 210 that protrude beyond the roller shaft 100 at both ends need to be bound separately using the first bundle of wire 211.

[0044] In some embodiments of the present invention, the manufacturing method further includes the following steps: Step S600, rotating the second bundle 220 so that the second binding part 231 rotates relative to the first binding part 233 to tighten the second bundle of wire 230. In this way, a twisted connection part 232 is formed between the first binding part 233 and the second binding part 231, which can tighten the first binding part 233 and the second binding part 231, and further tighten the first bundle 210 and the second bundle 220; moreover, the twisted connection part 232 is a structure with a certain degree of elasticity, and the first bundle 210 also has a certain degree of elasticity in its radial direction, so that the vibration generated when the second bundle 220 disperses sand particles can be absorbed by the twisted connection part 232 and the first bundle 210, reducing the risk of the second bundle 220 falling off the roller 100 due to vibration.

[0045] Furthermore, by performing step S500 first and then step S600, during the execution of step S600, when the middle part of the first hair bundle 210 is further tightened by the first binding part 233, both ends of the first hair bundle 210 will shrink towards the inside of the roller shaft 100. Since both ends of the first hair bundle 210 are restricted by the first bundle of wire 211, the part of the first hair bundle 210 inside the roller shaft 100 will be in a taut state, making the connection between the first hair bundle 210, the second bundle of wire 230 and the second hair bundle 220 more compact and less prone to loosening.

[0046] The sand-spreading device according to a third aspect embodiment of the present invention includes the aforementioned loose sand roller brush. The sand-spreading device also includes a mounting frame, which is equipped with a conveyor belt and a sand drop hopper located above the conveyor belt. The loose sand roller brush is mounted on the mounting frame and located at the downstream end of the conveyor belt. Other structures of the sand-spreading device are conventional technologies in the art, and their specific structures will not be described in detail here. By setting the aforementioned loose sand roller brush, the bristles are less likely to loosen and fall off, extending the service life of the roller brush, reducing the frequency of parts replacement, and thus improving production efficiency.

[0047] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A sanding roller characterized in that, include: A roller shaft has a hollow tubular structure, and the tube wall of the roller shaft is provided with a plurality of hole structures, the hole structures including at least a pair of first through holes and a plurality of second through holes; A tuft assembly is mounted on the roller shaft. The tuft assembly includes a plurality of tuft units corresponding one-to-one with the plurality of hole structures. Each tuft unit includes at least one first tuft and a plurality of second tufts. The first tuft passes through the roller shaft through a pair of first through holes, and its two ends extend out of the roller shaft from the first through holes. The middle part of the first tuft is located inside the roller shaft. The number of second tufts corresponds to the number of second through holes. Each second tuft is correspondingly disposed in one of the second through holes. The second tuft has a connecting end that extends into the roller shaft. The connecting end is connected to the portion of the first tuft located inside the roller shaft.

2. The decompacting rolling brush according to claim 1, characterized in that: The second hair bundle is folded along its length to form two free segments arranged side by side, and a bent segment connecting the two free segments, wherein the connecting end is located on the side of the bent segment away from the two free segments.

3. The decompacting rolling brush according to claim 2, characterized in that: A second bundle of wires is connected between the first hair bundle and the bent section. The second bundle of wires has a first binding part and a second binding part. The first binding part is bound to the first hair bundle, and the second binding part is bound to the second hair bundle at the connecting end.

4. The decompacting rolling brush of claim 1 wherein: Both the first and second hair bundles are steel wire bundles.

5. The decompacting rolling brush of claim 1, wherein: Each of the two first through holes has a shoulder at one end facing away from each other, and a first bundle of thread is provided inside the shoulder to bind the first hair bundle.

6. The decompacting rolling brush of claim 1, wherein: The first hair bundle extends radially along the roller shaft, and the number of the second hair bundles is even. A plurality of the second hair bundles are evenly distributed on both sides of the first hair bundle in a direction that is perpendicular to both the first hair bundle and the roller shaft.

7. A method for manufacturing a loose sand roller brush, characterized in that: The method for manufacturing a loose sand roller brush as described in any one of claims 1 to 6 comprises the following steps: A roller shaft is provided, wherein the roller shaft has a plurality of the hole structures; Fold the second tuft of hair in half to form a bent section; The bent section is inserted from the outside of the roller shaft into the inside of the roller shaft through the second through hole; The first hair bundle is passed through one of the first through holes and the other first through hole in sequence, and the bent section of the second hair bundle is fixedly connected to the middle part of the first hair bundle.

8. The method for manufacturing a loose sand roller brush according to claim 7, characterized in that: Also includes: After the bending section is formed, a second bundle of wire is provided, and a second binding portion of the second bundle of wire is bound to the bending section, with the first binding portion of the second bundle of wire located on the side of the second binding portion away from the bending section; The step of inserting the bent section from the outside of the roller shaft through the second through hole into the inside of the roller shaft includes: The second bundle of wires, together with the bent section, is inserted from the outside of the roller shaft through the second through hole into the inside of the roller shaft, and the first binding part is positioned between the two first through holes; The step of sequentially passing the first hair bundle through one of the first through holes and the other first through hole, and fixing the bent section of the second hair bundle to the middle part of the first hair bundle, includes: The first hair bundle is passed sequentially through one of the first through holes, the first binding part, and the other first through hole, so that the first hair bundle cooperates with the first binding part, and the two ends of the first hair bundle extend out of the roller shaft through the two first through holes respectively.

9. The method for manufacturing a loose sand roller brush according to claim 8, characterized in that: Also includes: Rotate the second bundle of yarn so that the second binding part rotates relative to the first binding part to tighten the second bundle of yarn.

10. A sand-laying device, characterized in that: Including the loose sand roller as described in any one of claims 1 to 6.

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