A wall sander

Abstract

This invention discloses a wall sander, including a main unit and a sanding device mounted on the main unit. The main unit provides power to the sanding device, which includes a sanding component, an extension device, and a conversion device. The sanding component is formed by a combination of two folding plates for limiting rotation. The extension device drives the two folding plates to rotate. This invention provides a wall sander capable of sanding flat surfaces and corners, reducing or eliminating the need for manual sanding, improving the utilization rate and efficiency of the wall sander, and thus reducing the labor intensity of operators.

Description

Technical Field

[0001] This invention relates to the field of wall sander technology, and in particular to a wall sander. Background Technology

[0002] In building decoration and wall renovation projects, wall sanding is a crucial process to ensure the quality of wall coating. Its core function is to remove imperfections from the wall substrate (such as bumps, burrs, and residual putty particles), achieving a smooth and even surface, thus laying the foundation for subsequent painting, wallpapering, and other processes. With the advancement of industrialization in the decoration industry, traditional manual sanding methods, which rely on sandpaper, are gradually being replaced by electric wall sanders due to their low efficiency, high labor intensity, and the significant influence of operator experience on sanding quality. Existing electric wall sanders, such as those described in publication number CN201720742U, typically employ a core structure where a motor drives the sanding disc or sandpaper. Combined with a handheld handle or extendable support, they enable efficient sanding of large wall areas. By adjusting parameters such as motor speed and sanding disc diameter, these devices can be adapted to different wall substrates (e.g., plaster putty layers, cement mortar layers), significantly improving the efficiency and standardization of sanding operations, and have become the mainstream tool on current construction sites. However, in actual construction scenarios, walls are not just flat areas; they also include numerous corners (inner and outer corners) formed between walls or between walls and ceilings. Existing wall sanders generally have blind spots and efficiency bottlenecks when dealing with these corners, making effective sanding impossible.

[0003] Its core problem stems from the limitations of the equipment's structural design: On the one hand, the grinding working parts of existing sanders (such as circular sanding discs and rectangular sandpaper holders) are mostly regular geometric shapes, and the grinding surface is designed as a flat or slightly curved surface. When facing a right-angle gap in the corner of a wall, the edge of the grinding part cannot completely fit the corner area of ​​the wall. On the other hand, some sanders have relatively large sanding parts (usually between 150mm and 300mm in diameter or side length) to ensure large-area sanding efficiency. This limits their flexibility in narrow corner spaces, making it difficult to accurately control the sanding force and angle. This can easily lead to over-sanding of corners (causing damage to the base layer) or incomplete sanding (leaving residual defects). Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a wall sander.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a wall sander, comprising a main unit and a sanding device configured on the main unit, wherein the main unit provides power to the sanding device, and the sanding device comprises a sanding component, an extension device, and a conversion device. The sanding component is formed by a combination of two folding plates for limiting rotation. The extension device is used to drive the two folding plates to rotate, so that the two folding plates are at different angles. The conversion device is used to convert the movement mode of the sanding component. When the two folding plates are at different angles, the sanding component rotates for sanding. When the extension device adjusts the angle of the sanding component, the conversion device adjusts simultaneously, so that the sanding component moves back and forth along the folding line direction.

[0006] Its beneficial effect is that the sander can sand both the wall surface and the corners, reducing the scope of manual sanding and lowering the labor intensity of the operators.

[0007] In the above scheme, preferably, the grinding device further includes a frame component disposed on the main unit and a moving component disposed on the frame component. The frame component has an elongated groove, and the moving component includes a round shaft portion. The moving component is elastically guided and slidably disposed in the elongated groove through the round shaft portion. The grinding component is disposed on the moving component through an extension device. The conversion device is used to make the moving component move back and forth along the elongated groove or to make the moving component rotate.

[0008] In the above scheme, preferably, the two folding plates are configured to be mutually limited and rotated by hinges or pivots, and the folding axes of the two folding plates are parallel to the direction of the long groove. When the two folding plates are at a certain angle, their lower ends are limited and touch each other.

[0009] In the above scheme, preferably, a first rotating shaft is arranged on the upper surface of the folding plate, and a second rotating shaft is arranged on the folding axis. The extension device includes a connecting rod and a telescopic member. A rotating shaft is arranged on the moving member. At least two connecting rods are arranged, with one end of each connecting rod rotatably arranged on the rotating shaft and the other end rotatably arranged on the first rotating shaft of the two folding plates respectively. One end of the telescopic member is fixedly arranged on the moving member, and the other end is rotatably arranged on the second rotating shaft. The telescopic member extends and retracts to change the angle of the two folding plates.

[0010] In the above scheme, preferably, the moving part is equipped with a first rotating part, the first rotating part is equipped with a central shaft, the conversion device includes a second rotating part, the second rotating part is rotatably mounted on the frame part, the second rotating part is equipped with an eccentric shaft, the eccentric shaft and the central shaft are connected by a second connecting rod, and the rotation of the second rotating part drives the moving part to reciprocate on the long groove.

[0011] In the above scheme, preferably, the conversion device further includes a third rotating component and a hydraulic component. The frame component is provided with a second long groove. The third rotating component is rotatably and slidably disposed on the second long groove. The hydraulic component is fixedly disposed on the frame component, and the front end of its telescopic rod is rotatably disposed on the third rotating component. The power component of the main unit is connected to the third rotating component through a flexible shaft to achieve power connection. The extension and retraction of the hydraulic component drives the third rotating component to cooperate and connect with the first rotating component or the second rotating component, thereby transmitting power.

[0012] In the above scheme, preferably, a semi-circular ring is elastically guided and slidably configured on the long groove. The two ends of the long groove are semi-circular openings with the same diameter as the circular shaft. The semi-circular ring elastically contacts the circular shaft, so that the other side of the circular shaft contacts the end face of one side of the long groove at the beginning, so that the circular shaft is elastically positioned at the beginning and can rotate smoothly at high speed.

[0013] In the above scheme, preferably, the moving part is equipped with an electric telescopic component, the frame component has a third long groove parallel to the long groove, and the upper end of the electric telescopic component is equipped with a cylindrical elastic telescopic head. When the third rotating component is disconnected from the first rotating component, the electric telescopic component extends out, and the moving part is rotated to make the cylindrical elastic telescopic head enter the third long groove so that the moving part cannot rotate.

[0014] In the above scheme, preferably, the elastic telescopic head is equipped with a trigger switch, so that the power component cannot be energized and rotated when the cylindrical elastic telescopic head is not popped out.

[0015] In the above scheme, preferably, the third long groove is opened on the outside of the long groove so that when the electric telescopic component rises, the cylindrical elastic telescopic head can only extend at the third long groove.

[0016] The beneficial effects of the present invention are: the present invention provides a wall sander that can sand the flat surface of the wall and can also deform to sand the corner of the wall, reducing or eliminating the area of ​​manual sanding, improving the utilization rate of the wall sander, improving sanding efficiency, and thus reducing the labor intensity of the operator. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Figure 2 This is a cross-sectional view of the grinding device of the present invention.

[0019] Figure 3 This is a frontal sectional view of the grinding device of the present invention after being folded up.

[0020] Figure 4 This is a side cross-sectional view of the grinding device of the present invention after it has been folded up.

[0021] Figure 5This is a cross-sectional view of the conversion device of the present invention.

[0022] Figure 6 This is a schematic diagram of the grinding device of the present invention after being folded.

[0023] Figure 7 This is a schematic diagram of the conversion device of the present invention. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1:

[0025] See Figures 1-7 A wall sander includes a sanding device 1 and a main unit 2. The main unit 2 includes a handle 21, a dust collection device 22, and a power unit 23. The power unit 23 includes a fixed frame 231 and a power component 232 disposed on the fixed frame 231. The handle 21 is rotatably disposed on the fixed frame 231 so that the fixed frame 231 can rotate relative to the handle 21. The sanding device 1 is disposed on the fixed frame 231, so that when the operator holds the handle 21, the sanding device 1 can rotate relative to the handle 21, thereby allowing the sanding device 1 to conform to the wall surface for sanding.

[0026] The grinding device 1 includes a grinding component 11, an extension device 12, a conversion device 13, a frame component 14, and a moving component 15. The frame component 14 has an elongated groove 141, and the moving component 15 has a circular shaft portion 151. The moving component 15 is slidably disposed on the elongated groove 141 via the circular shaft portion 151. Limiting components are provided above and below the circular shaft portion 151, thereby limiting the moving component 15 to be positioned on the elongated groove 141. One end face of the elongated groove 141 is arc-shaped, and its diameter is the same as that of the circular shaft portion 151. At the same time, a semi-circular ring 1411 is elastically guided on the elongated groove 141. The semi-circular ring 1411 elastically contacts the circular shaft portion 151, thereby causing the circular shaft portion 151 to elastically contact the arc-shaped end face in the initial state, so that the circular shaft portion 151 is in a surrounding and supporting state, thereby limiting its positioning and rotation.

[0027] A first rotating member 152 is disposed on the moving member 15. The first rotating member 152 is fixedly disposed on the moving member 15 and concentric with the moving member 15, so that when the first rotating member 152 rotates, the rotating member 15 also rotates. The rotating device 13 includes a second rotating member 131, a third rotating member 132, and a hydraulic component 133. The frame member 14 is divided into a first plate and a second plate. The second rotating member 131 is rotatably disposed on the second plate of the frame member 14 and does not contact the first rotating member 152. A central shaft 1521 is disposed at the center of the first rotating member 152, and an eccentric shaft 1311 is disposed on the second rotating member 131. The axis of the eccentric shaft 1311 is offset from the axis of the second rotating member 131. Meanwhile, one end of the second connecting rod 1522 is rotatably mounted on the eccentric shaft 1311, and the other end of the second connecting rod 1522 is rotatably mounted on the central shaft 1521 of the first rotating member 152. The second long groove 142, which is aligned with the direction of the long groove 141, is opened on the second layer plate of the frame member 14. The third rotating member 132 is slidably mounted on the second long groove 142, and a ring is mounted on the third rotating member 132 so that it can rotate while sliding on the second long groove 142. The hydraulic member 133 is mounted on the frame member 14, and the front end of the telescopic rod on the hydraulic member 133 is mounted on the ring of the third rotating member 132. Thus, the hydraulic member 133 extends and retracts, driving the third rotating member 132 to move back and forth on the second long groove 142.

[0028] The third rotating member 132 is connected to the power member 232 via a flexible shaft. The power member 232 rotates to drive the third rotating member 132 to rotate, and the third rotating member 132 moves on the second long groove 142 to engage with the first rotating member 152 or the second rotating member 131.

[0029] When the third rotating member 132 is engaged with the first rotating member 152, the first rotating member 152 rotates, which in turn causes the moving member 15 to rotate. When the third rotating member 132 is engaged with the second rotating member 131, the second rotating member 131 rotates, which in turn drives the eccentric shaft 1311 to rotate. Through the second connecting rod 1522, the first rotating member 152 is driven to reciprocate back and forth on the long groove 141.

[0030] In this embodiment, the first rotating component 152, the second rotating component 131, and the third rotating component 132 are all gears.

[0031] A third long groove 143 is also provided on a layer plate of the frame member 14. The third long groove 143 is located outside the long groove 141 and is in the same direction as the long groove 141. An electric telescopic member 16 is provided on the moving member 15. The electric telescopic member 16 is electrically controlled to move up and down. A cylindrical elastic telescopic head 161 is provided on the top of the telescopic rod of the electric telescopic member 16.

[0032] When the third rotating member 132 is engaged with the first rotating member 152, i.e., the hydraulic member 133 is in a retracted state, the electric telescopic member 16 is also in a retracted state under the control of the central control unit. Simultaneously, the cylindrical elastic telescopic head 161 is in an extended state and does not contact the lower end face of the second layer plate of the frame member 14. When the third rotating member 132 is engaged with the second rotating member 131, i.e., the hydraulic member 133 is in an extended state, the electric telescopic member 16 is also in an extended state. Then, the cylindrical elastic telescopic head 161 elastically contacts the lower end surface of the second layer plate. At this time, the moving part 15 is rotated so that the cylindrical elastic telescopic head 161 is aligned with the third long groove 143 and then elastically extends into the third long groove 143. At this time, the moving part 15 can no longer rotate under the limitation of the cylindrical elastic telescopic head 161, but can slide back and forth along the direction of the third long groove 143. Then, when the third rotating part 132 and the second rotating part 131 are engaged, the rotation of the moving part 15 is restricted, and it can only slide along the long groove 141.

[0033] A trigger switch is installed inside the cylindrical elastic telescopic head 161. Only after the cylindrical elastic telescopic head 161 is extended can the operator press the start switch to make the power component 232 run to provide power to the third rotating component 132.

[0034] The grinding component 11 has two folding plates 111 that are mutually restrictive and rotatably connected together. The grinding component 11 can be a circular component or an equilateral polygonal component, and the folding axis is located on the line of symmetry of the grinding component 11. A grinding disc is disposed on the lower end surface of the folding plate 111. Limiting components are disposed on both the upper and lower end surfaces of the two folding plates 111 to limit the folding angle. A mutually guiding arc-shaped limiting plate 114 is disposed on the upper end surface. In this embodiment, the angle that can be formed is 90-180 degrees. When the two folding plates 111 are at 180 degrees, the lower end limiting plates touch each other. When the two folding plates 111 are at 90 degrees, the mutually guiding arc-shaped limiting plates 114 slide together and their end faces touch the upper end surface of the folding plates 111, thereby limiting the two folding plates 111.

[0035] The two folding plates 111 are mutually rotatable and mutually restrained by hinges or pivots. A first pivot 112 is disposed on the upper surface of each folding plate 111, and a second rotating member 113 is disposed coaxially with the folding axis. The extension device 12 includes connecting rods 121 and telescopic members 122. Four connecting rods 121 are disposed. A pivot 153 is symmetrically disposed on the lower end of the moving member 15. One end of the connecting rod 121 is rotatably disposed on the pivot 153, and the other end is rotatably disposed on the first pivot 112 of one folding plate 111. One end of a second connecting rod 121 is also disposed on the same pivot 153, and the other end of the second connecting rod 121 is rotatably disposed on the first pivot 112 of the other folding plate 111. Two connecting rods 121 are symmetrically arranged on the moving shaft 112 and another rotating shaft 152, and are also connected to the first rotating shaft 112 of the two folding plates 111. The front end of the telescopic rod of the telescopic member 122 is rotatably arranged on the second rotating member 113, and the telescopic member 122 is fixedly arranged on the moving member 15. Thus, the connecting rod 121, the telescopic member 122 and the folding plate 111 form a triangle. When the telescopic member 122 extends, the angle between the connecting rod 121 and the folding plate 111 changes. Since the two folding plates 111 are symmetrically arranged, when the telescopic member 122 extends, the two folding plates 111 fold synchronously, that is, the folding shaft moves downward, and thus the two folding plates 111 form a 90° angle.

[0036] This results in the two planes at the corner of the wall being in a perpendicular state.

[0037] Its working principle or usage method is as follows: In the initial state, the telescopic component 122 is in the retracted state, and the two folding plates 111 are at 180 degrees. At the same time, when the third rotating component 132 is engaged with the first rotating component 152, the moving component 15 rotates, and the grinding component 11 rotates synchronously, so that the grinding component 11 performs a rotating grinding operation on the wall surface.

[0038] When encountering a corner, the operator presses the button on the handle 21, and the power component 232 automatically stops rotating. At this time, the electric telescopic component 16, the hydraulic component 133, and the telescopic component 122 extend synchronously. The hydraulic component 133 extends, and the third rotating component 132 engages with the second rotating component 131. The electric telescopic component 16 extends, causing the cylindrical elastic telescopic head 161 to elastically contact the lower end surface of the second layer plate. At this time, the operator rotates the grinding component 11, causing the cylindrical elastic telescopic head 161 to automatically extend after aligning with the third long groove 143. This prevents the moving component 15 from rotating and allows it to slide back and forth along the long groove 141. The telescopic component 122 extends, causing the two folding plates 111 to fold and form a 90-degree angle.

[0039] Once everything is ready, the operator presses the start switch, and the third rotating component 132 drives the second rotating component 132 to rotate, which in turn causes the moving component 15 to reciprocate along the long groove 141, which in turn causes the grinding component 11, which is at a 90-degree angle, to reciprocate along the flip axis. The two folding plates 111 simultaneously grind the two surfaces of the corner.

[0040] Example 2:

[0041] See Figures 1-7 The difference from Embodiment 1 lies in the structure of the grinding component 11; all other aspects are the same. The same grinding disc is attached to both folding plates 111, and the base at the position of the two folding plates 111 is made of an elastic material, or the entire base of the grinding disc is made of an elastic material. Therefore, when the two folding plates 111 are folded, the gap is also covered by the grinding disc, allowing the corner to be rounded during corner grinding, thus improving the corner grinding effect.

[0042] Example 3:

[0043] See Figures 1-7 The difference between this embodiment and Example 1 lies in the structure of the telescopic component 122; all other aspects are the same.

[0044] The handle 21 is equipped with an adjustment knob, which is used to control the extension distance of the telescopic member 122, so that the two folding plates 111 can be at different angles, that is, within the range of 90-180 degrees, which can be set by the operator to meet the grinding needs of different angle corners.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wall sander, characterized in that: It includes a main unit (2) and a polishing device (1) configured on the main unit (2), wherein the main unit (2) provides power to the polishing device (1); The grinding device (1) includes a grinding component (11), an extension device (12) and a conversion device (13). The grinding component (11) is formed by a combination of a folding plate (111) for limiting rotation. The extension device (12) is used to drive the two folding plates (111) to rotate, so that the two folding plates (111) are at different angles. The conversion device (13) is used to convert the movement mode of the grinding part (11). When the two folding plates (111) are at 180 degrees, the grinding part (11) rotates for grinding. When the extension device (12) adjusts the angle of the grinding part (11), the conversion device (13) adjusts synchronously so that the grinding part (11) moves back and forth along the folding line. The grinding device (1) further includes a frame (14) disposed on the main unit (2) and a moving part (15) disposed on the frame (14). The frame (14) has an elongated groove (141). The moving part (15) includes a round shaft (151). The round shaft (151) is elastically guided and slidably disposed in the elongated groove (141). The grinding part (11) is disposed on the moving part (15) through an extension device (12). The conversion device (13) is used to make the moving part (15) move back and forth along the elongated groove (141) or to make the moving part (15) rotate. The moving part (15) is provided with a first rotating part (152), and a central shaft (1521) is provided on the first rotating part (152). The conversion device (13) includes a second rotating part (131), which is rotatably mounted on the frame part (14). An eccentric shaft (1311) is provided on the second rotating part (131), and the eccentric shaft (1311) is connected to the central shaft (1521) by a second connecting rod (1522). The rotation of the second rotating part (131) drives the moving part (15) to reciprocate on the long groove (141). The conversion device (13) further includes a third rotating component (132) and a hydraulic component (133). The frame component (14) is provided with a second long groove (142). The third rotating component (132) rotates and slides on the second long groove (142). The hydraulic component (133) is fixedly arranged on the frame component (14), and the front end of its telescopic rod is rotatably arranged on the third rotating component (132). The power component of the host (2) is connected to the third rotating component (132) through a flexible shaft. The hydraulic component (133) extends and retracts to drive the third rotating component (132) to cooperate with the first rotating component (152) or the second rotating component (131) to perform power transmission.

2. A wall sander according to claim 1, characterized in that: The two folding plates (111) are configured to be mutually limited and rotated by hinges or pivots, and the folding axis of the two folding plates (111) is parallel to the direction of the long groove (141). When the two folding plates (111) are at 180 degrees, their lower ends are limited and touch each other.

3. A wall sander according to claim 1, characterized in that: The upper surface of the folding plate (111) is provided with a first rotating shaft (112), and a second rotating shaft (113) is provided on the folding axis. The extension device (12) includes a connecting rod (121) and a telescopic member (122). The moving member (15) is provided with a round shaft (151). There are at least two connecting rods (121). One end of each connecting rod (121) is rotatably disposed on the round shaft (151), and the other end is rotatably disposed on the first rotating shaft (112) of the two folding plates (111). One end of the telescopic member (122) is fixedly disposed on the moving member (15), and the other end is rotatably disposed on the second rotating shaft (113). The telescopic member (122) extends and retracts to change the angle of the two folding plates (111).

4. A wall sander according to claim 1, characterized in that: A semi-circular ring (1411) is elastically guided and slidably disposed on the long groove (141). The two ends of the long groove (141) are semi-circular openings with the same diameter as the circular shaft (151). The semi-circular ring (1411) elastically contacts the circular shaft (151) so that the other side of the circular shaft (151) contacts the end face of one side of the long groove (141) at the beginning, so that the circular shaft (151) is elastically positioned at the beginning, so that it can rotate smoothly and at high speed.

5. A wall sander according to claim 4, characterized in that: The moving part (15) is equipped with an electric telescopic part (16), and the frame part (14) is provided with a third long groove (143) parallel to the long groove (141). The upper end of the electric telescopic part (16) is provided with a cylindrical elastic telescopic head (161). When the third rotating part (132) is disconnected from the first rotating part (152), the electric telescopic part (16) extends out and rotates the moving part (15) so that the cylindrical elastic telescopic head (161) enters the third long groove (143) so that the moving part (15) cannot rotate.

6. A wall sander according to claim 5, characterized in that: The elastic telescopic head (161) is equipped with a trigger switch, and the power component cannot be energized and rotated when the cylindrical elastic telescopic head (161) is not popped out.

7. A wall sander according to claim 6, characterized in that: The third long slot (143) is opened on the outside of the long slot (141) so that when the electric telescopic member (16) rises, the cylindrical elastic telescopic head (161) can only extend at the third long slot (143).

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