Plate rounded corner sanding machine

Abstract

The present invention provides a plate fillet sanding machine, which relates to the field of sanding machines, and includes: a bracket; a ventilation pipe group, which is used to connect an exhaust device; an inner rotating wheel, which is provided with a ventilation cavity connected to the ventilation pipe group and a plurality of circumferentially arranged first dust suction holes, the first dust suction holes being connected to the ventilation cavity; an outer rotating wheel, which is provided with a processing annular groove for grinding the fillet of the plate and a plurality of circumferentially arranged second dust suction holes; a driving component, which is used to drive the inner rotating wheel to rotate relative to the bracket; an elastic component, which includes an expansion part and a contraction part movably connected to the inner rotating wheel, when the inner rotating wheel rotates, the contraction part abuts against the inclined part and drives the outer rotating wheel to rotate; when the speed of the inner rotating wheel is greater than a threshold, the expansion part moves away from the center of the circle under the action of centrifugal force and drives the contraction part to contract toward the center of the circle, at which time the contraction part rotates relative to the outer rotating wheel by an angle φ and then abuts against the inclined part, and the opening of the dust suction port increases. The larger the opening of the dust suction port, the higher the efficiency of dust suction.

Description

Technical Field

[0001] The invention relates to the technical field of sanding machines, in particular to a plate rounding sanding machine. Background Art

[0002] Corner sanders are mainly used to grind the rounded corners of workpieces. The grinding process will generate a lot of dust, so a dust removal mechanism needs to be set on the sander. In the prior art, workpieces are generally fed intermittently, so the sander also works intermittently. However, the dust removal mechanism is usually in working state all the time, resulting in high energy consumption of the dust removal mechanism.

[0003] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] Based on this, it is necessary to provide a plate rounded corner sanding machine to address the problem of high energy consumption of the dust removal mechanism of the current rounded corner sanding machine.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A plate rounding sander, comprising:

[0007] Bracket;

[0008] A ventilation pipe set, used to connect the air extraction device;

[0009] An inner rotating wheel, the inner rotating wheel is rotatably connected to the bracket; the inner rotating wheel is provided with a ventilation cavity connected to the ventilation pipe group and a plurality of circumferentially arranged first dust suction holes, the first dust suction holes are connected to the ventilation cavity;

[0010] An outer rotating wheel, wherein the outer rotating wheel is sleeved on the outer side of the inner rotating wheel; the outer rotating wheel is provided with an inclined portion, and the long side of the inclined portion intersects with the inner hole circle of the outer rotating wheel; the outer rotating wheel is provided with a processing annular groove for grinding the fillet of the plate and a plurality of circumferentially arranged second dust suction holes, the second dust suction holes are connected with the processing annular groove; the opening formed by the connection between the first dust suction hole and the second dust suction hole is a dust suction port;

[0011] A driving assembly, used for driving the inner rotating wheel to rotate relative to the bracket;

[0012] An elastic component includes an expansion part and a contraction part movably connected to the inner wheel. When the inner wheel rotates, the contraction part abuts against the inclined part and drives the outer wheel to rotate; when the rotation speed of the inner wheel is greater than a threshold, the expansion part moves away from the center of the circle under the action of centrifugal force and drives the contraction part to contract toward the center of the circle. At this time, the contraction part rotates relative to the outer wheel by an angle φ and then abuts against the inclined part, thereby increasing the opening of the dust suction port.

[0013] Further, the elastic component includes a spring coil;

[0014] The shaft end of the inner rotating wheel is provided with a mounting column with an N-gonal cross section, and the spring ring is sleeved on the outside of the mounting column; the corners of the spring ring are the contraction part, and the edges of the spring ring are the expansion part; the outer rotating wheel is provided with a mounting groove with an N-gonal cross section; the side wall of the mounting groove is the inclined part;

[0015] Let the radius of the circumscribed circle of the installation groove be a, the radius of the inscribed circle of the installation groove be b, and the radius of the circumscribed circle of the spring ring be c, then a>c>b.

[0016] Furthermore, the elastic component also includes a buffer ring, which is sleeved on the mounting post and located between the mounting post and the spring ring.

[0017] Furthermore, the outer rotating wheel includes a wheel body and a cover plate that are detachably connected; the wheel body is sleeved on the inner rotating wheel, and the wheel body is provided with the second dust suction hole and the mounting groove; the cover plate is used to cover the mounting groove.

[0018] Furthermore, a plurality of limit blocks are provided on the circumference of the inner rotating wheel, and the limit blocks pass through the second dust suction holes.

[0019] Furthermore, the cross section of the limit block is in a stepped shape, and the outer rotating wheel is provided with a limit groove that cooperates with the limit block.

[0020] Furthermore, it also includes a processor and a detection component; the detection component is used to detect the size of the suction port; the drive component and the detection component are both electrically connected to the processor.

[0021] Furthermore, the detection component includes a pressure sensor electrically connected to the processor; one end of the pressure sensor is arranged on the limit block, and the other end of the pressure sensor is arranged at the bottom of the limit groove, and the pressure sensor is used to detect the pressure between the inner wheel and the outer wheel.

[0022] Furthermore, the driving assembly includes a hollow shaft motor; the ventilation pipe group includes a first pipe; the hollow shaft motor is fixed on the bracket; one end of the first pipe is transmission connected to the hollow shaft motor, and the other end of the first pipe is fixedly connected to the inner rotating wheel; the first pipe is connected to the ventilation chamber.

[0023] Furthermore, the ventilation pipe group also includes a second pipe; the second pipe is fixed on the bracket and connected to the first pipe; the second pipe is used to connect to the air extraction device.

[0024] The beneficial effects of the present invention are:

[0025] The driving component drives the inner wheel to rotate, the contraction part of the elastic component abuts the inclined part of the outer wheel and drives the outer wheel to rotate, the plate abuts the processing ring groove of the outer wheel, and the outer wheel can round the plate; the outer wheel rotates relative to the inner wheel, the first dust suction hole is connected with the second dust suction hole to form a dust suction port, the dust generated by the plate processing enters the dust suction port from the processing ring groove and then flows to the ventilation pipe group, because the dust suction port is close to the processing ring groove, the dust is sucked the next moment it is generated, and the dust removal efficiency is high. When the speed of the inner wheel is greater than the threshold, the expansion part moves away from the center of the circle under the action of centrifugal force and drives the contraction part to shrink toward the center of the circle. At this time, the contraction part rotates relative to the outer wheel by an angle φ and then abuts the inclined part, so that the opening of the dust suction port becomes larger. The greater the speed of the inner wheel, the larger the opening of the dust suction port, and the higher the efficiency of dust absorption; the plate rounding sanding machine of the present invention can automatically adjust the efficiency of dust absorption according to the power of grinding the rounded corners of the workpiece, avoiding the dust removal operation when the grinding operation is stopped, reducing the energy consumption of the sanding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a plate rounding sander according to an embodiment of the present invention;

[0027] Figure 2 An exploded view of a plate rounding sander according to an embodiment of the present invention;

[0028] Figure 3 It is an axial cross-sectional view of a plate rounding sander according to an embodiment of the present invention;

[0029] Figure 4 A radial cross-sectional view of a plate rounding sander according to an embodiment of the present invention;

[0030] Figure 5 for Figure 4 Schematic diagram of the outer and middle wheels rotating relative to the inner wheel;

[0031] Figure 6 It is a schematic structural diagram of the elastic component before the outer rotating wheel rotates relative to the inner rotating wheel according to one embodiment of the present invention;

[0032] Figure 7 for Figure 6 A schematic diagram of the structure of the elastic component after the inner and outer wheels rotate relative to the inner wheel;

[0033] Figure 8 for Figure 6 Schematic diagram of the elastic component after deformation.

[0034] Wherein: 100, rounded corner sander; 210, inner rotating wheel; 211, mounting column; 212, limit block; 2121, processing surface; 2101, first dust suction hole; 220, outer rotating wheel; 2201, processing ring groove; 2202, second dust suction hole; 2203, mounting groove; 2204, limit groove; 2210, wheel body; 2220, cover plate; 300, bracket; 410, first tube; 420, second tube; 500, drive assembly; 610, spring ring; 620, buffer ring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Combine the following Figure 1-Figure 8, describing a plate rounding sander according to an embodiment of the present invention.

[0039] A plate fillet sander, comprising: a bracket 300; a ventilation pipe group for connecting an exhaust device; an inner rotating wheel 210, the inner rotating wheel 210 is rotatably connected to the bracket 300; the inner rotating wheel 210 is provided with a ventilation cavity connected to the ventilation pipe group and a plurality of circumferentially arranged first dust suction holes 2101, the first dust suction holes 2101 are connected to the ventilation cavity; an outer rotating wheel 220, the outer rotating wheel 220 is sleeved on the outer side of the inner rotating wheel 210; the outer rotating wheel 220 is provided with an inclined portion and the long side of the inclined portion intersects with the inner hole circle of the outer rotating wheel 220; the outer rotating wheel 220 is provided with a processing annular groove 2201 for grinding the fillet of the plate and a plurality of circumferentially arranged second dust suction holes 2202, the second dust suction holes 2201 are arranged The dust suction hole 2202 is connected to the machined annular groove 2201; the opening formed by the connection between the first dust suction hole 2101 and the second dust suction hole 220 is the dust suction port; the driving component 500 is used to drive the inner rotating wheel 210 to rotate relative to the bracket 300; the elastic component includes an expansion part and a contraction part movably connected to the inner rotating wheel 210, when the inner rotating wheel 210 rotates, the contraction part abuts against the inclined part and drives the outer rotating wheel 220 to rotate; when the rotation speed of the inner rotating wheel 210 is greater than the threshold, the expansion part moves away from the center of the circle under the action of centrifugal force and drives the contraction part to contract toward the center of the circle, at this time, the contraction part rotates relative to the outer rotating wheel 220 by an angle φ and then abuts against the inclined part, and the opening of the dust suction port is increased.

[0040] The bracket 300 can be fixed on a processing platform or installed on a handheld processing device.

[0041] When the rounded corner sander 100 is working, the external air extraction device is turned on, and the air extraction device is connected to the ventilation pipe group and is used to extract the gas in the ventilation pipe group. The air extraction device can be, but is not limited to, an exhaust fan.

[0042] The corner fillet sander 100 is started, and the driving assembly 500 drives the inner rotating wheel 210 to rotate relative to the bracket 300, and the inner rotating wheel 210 then drives the outer rotating wheel 220 to rotate forward through the elastic assembly. The plate is abutted against the processing annular groove 2201 of the outer rotating wheel 220, and the rotating outer rotating wheel 220 can perform corner fillet processing on the plate; at this time, the outer rotating wheel 220 rotates circumferentially relative to the inner rotating wheel 210, so that the first dust suction hole 2101 and the second dust suction hole 2202 are connected to form a dust suction port, and the dust generated by the plate processing enters the dust suction port from the processing annular groove 2201 and then flows to the ventilation pipe group. Since the dust suction port is close to the processing annular groove 2201, the dust is sucked in the next moment it is generated, and the dust removal efficiency is high.

[0043] Two ends of the inclined portion of the outer rotating wheel 220 are respectively a first end and a second end. The first end is far away from the center of the outer rotating wheel 220 , and the second end is close to the center of the outer rotating wheel 220 .

[0044] When the inner rotating wheel 210 is stationary, the first dust suction hole 2101 and the second dust suction hole 2202 are offset and sealed from each other, or the dust suction port formed by the first dust suction hole 2101 and the second dust suction hole 2202 is connected to form a smaller opening.

[0045] When the inner rotating wheel 210 starts to rotate and the rotating direction is toward the inclined portion of the outer rotating wheel 220, the contraction portion of the elastic component abuts against the inclined portion and applies a tangential force to the inclined portion, thereby driving the outer rotating wheel 220 to rotate. At this time, the contraction portion is close to the first end of the inclined portion and away from the second end;

[0046] When the rotation speed of the inner wheel 210 is greater than the threshold, the expansion part moves away from the center of the inner wheel 210 under the action of centrifugal force and drives the contraction part to contract toward the center of the inner wheel 210. The deformation of the expansion part generates an elastic force pointing to the center of the circle. The contraction part rotates relative to the outer wheel 220 by an angle φ and then abuts the inclined part. At this time, the contraction part is close to the second end of the inclined part and away from the first end. As the rotation speed of the inner wheel 210 gradually increases, the contraction part continues to approach the second end of the inclined part, and the opening of the dust suction port gradually increases, and the efficiency of dust suction is improved. The rounded corner sanding machine 100 can automatically adjust the efficiency of dust suction according to the power of grinding the rounded corners of the workpiece, avoiding the dust removal operation when the grinding operation stops, reducing the energy consumption of the sanding machine.

[0047] When the rounded corner sander 100 finishes grinding, the rotation speed of the inner wheel 210 gradually decreases, and the centrifugal force on the expansion part also gradually decreases. The expansion part moves toward the center of the inner wheel 210 under the action of its own elastic force and drives the contraction part away from the center of the inner wheel 210. At this time, the contact position between the contraction part and the inclined part of the outer wheel 220 slides from the second end side to the first end side, so that the opening of the dust suction port gradually decreases. In one embodiment, the number of inclined parts can be one, and the inclined part is arranged on the inner side wall of the outer wheel 220. It is stipulated that the direction in which the inner wheel 210 drives the contraction part to rotate toward the inclined part is positive. A limit mechanism can be arranged between the inner wheel 210 and the outer wheel 220, and the limit mechanism is used to prevent the inner wheel 210 from rotating in the opposite direction relative to the outer wheel 220.

[0048] In another embodiment, the number of the inclined portions may be multiple and circumferentially arranged on the inner wall of the outer rotating wheel 220 , and the number of the contraction portions and the expansion portions may also be multiple and correspond to the inclined portions.

[0049] It should be noted that the surface of the inclined portion used to contact the shrinkage portion can be a smooth plane, or it can be provided with special-shaped structures such as convex teeth, grooves, and snaps, which can meet the conditions for the shrinkage portion to cooperate with the inclined portion at different positions, and after the two cooperate, the shrinkage portion can drive the inclined portion to rotate around the axis of the outer rotating wheel 220.

[0050] In one embodiment, the elastic component includes a spring ring 610; the shaft end of the inner rotating wheel 210 is provided with a mounting column 211 with an N-gonal cross section, and the spring ring 610 is sleeved on the outside of the mounting column 211; the corners of the spring ring 610 are contraction parts, and the edges of the spring ring 610 are expansion parts; the outer rotating wheel 220 is provided with a mounting groove 2203 with an N-gonal cross section; let the circumscribed circle radius of the mounting groove 2203 be a, the inscribed circle radius of the mounting groove 2203 be b, and the circumscribed circle radius of the spring ring 610 be c, then a>c>b.

[0051] The number of the spring rings 610 can be two, and the cross-sectional shape of the spring ring 610 is polygonal and matches with the mounting post 211. The mounting posts 211 can be provided at both ends of the inner rotating wheel 210 to match the spring ring 610. Compared with the method of providing an elastic component at only one end of the inner rotating wheel 210, providing spring rings 610 at both ends of the inner rotating wheel 210, the inner rotating wheel 210 drives the outer rotating wheel 220 to rotate more stably through the elastic component, and the outer rotating wheel 220 is not prone to twisting during rotation.

[0052] The cross-sectional shapes of the mounting column 211 , the spring ring 610 and the mounting groove 2203 are all N-gons, such as regular hexagons.

[0053] refer to Figure 6 , the spring ring 610 is sleeved on the outside of the mounting column 211 and fits with the mounting column 211. Due to a>c>b, when the inner rotating wheel 210 is stationary or rotates slightly, there is a certain gap between the spring ring 610 and the mounting groove 2203, and the outer rotating wheel 220 does not rotate with the inner rotating wheel 210. After the inner rotating wheel 210 rotates by an angle α, the edges and corners of the spring ring 610 abut against the side wall of the mounting groove 2203, and the inner rotating wheel 210 drives the outer rotating wheel 220 to rotate. The specific value of α is related to relevant parameters, such as the lengths of a, b, and c, the initial positions of the mounting column 211 and the mounting groove 2203, the elastic modulus of the spring ring 610, and the like.

[0054] refer to Figure 8, the inner wheel 210 rotates in the direction of arrow O. When the speed of the inner wheel 210 is high, the spring coil 610 is deformed due to centrifugal force, and the corners of the spring coil 610 shrink toward the center of the spring coil 610, such as the direction of arrow Q; the straight edge of the spring coil 610 expands toward the outside of the spring coil 610, such as the direction of arrow P. When the speed of the inner wheel 210 is low, after the inner wheel 210 rotates by an angle α, the spring coil 610 can drive the outer wheel 220 to rotate, and the cross-sectional area of ​​the dust suction port is S1; when the speed of the inner wheel 210 is high, the spring coil 610 is deformed due to centrifugal force, but the degree of deformation is small. After the inner wheel 210 rotates by an angle β, the spring coil 610 can drive the outer wheel 220 to rotate, and the cross-sectional area of ​​the dust suction port is S2, β>α, S2>S1. Therefore, the higher the speed of the inner wheel 210, the larger the opening of the dust suction port, and the higher the efficiency of dust collection.

[0055] In one embodiment, the elastic component further includes a buffer ring 620, which is sleeved on the mounting post 211 and located between the mounting post 211 and the spring ring 610. The buffer ring 620 can prevent the spring ring 610 from shaking relative to the mounting post 211 after being sleeved on the mounting post 211. The buffer ring 620 can be, but is not limited to, a sponge pad.

[0056] In one embodiment, the outer rotating wheel 220 includes a wheel body 2210 and a cover plate 2220 that are detachably connected; the wheel body 2210 is sleeved on the inner rotating wheel 210, and the wheel body 2210 is provided with a second dust suction hole 2202 and an installation groove 2203; the cover plate 2220 is used to cover the installation groove 2203.

[0057] The wheel body 2210 is provided with a plurality of threaded holes in the circumference, and the bolts pass through the cover plate 2220 and are connected to the wheel body 2210. After the cover plate 2220 is connected to the wheel body 2210, the spring ring 610 and the buffer ring 620 can be prevented from axially disengaging from the mounting column 211. It should be noted that a through hole is provided in the middle of the cover plate 2220 near the driving assembly 500 so that the ventilation pipe group can pass through.

[0058] In one embodiment, a plurality of limiting blocks 212 are circumferentially disposed on the inner rotating wheel 210 , and the limiting blocks 212 pass through the second dust suction holes 2202 .

[0059] refer to Figure 4-Figure 8 In one of the second dust suction holes 2202, the two circumferential sides of the second dust suction hole 2202 are respectively A side and B side. When the inner rotating wheel 210 is not rotating, the limit block 212 abuts against the A side of the second dust suction hole 2202, and the limit block 212 cooperates with the outer wall of the inner rotating wheel 210 to seal the second dust suction hole 2202. At this time, the positional relationship between the mounting column 211 and the spring ring 610 and the mounting groove 2203 is as shown in FIG. Figure 6As shown, the corners of the mounting column 211 are aligned with the corners of the mounting groove 2203; when the inner rotating wheel 210 rotates a certain angle in the direction of arrow Y, the corners of the spring ring 610 abut against the side wall of the mounting groove 2203, and the position of the limit block 212 in the second dust suction hole 2202 is as shown in FIG. Figure 5 As shown, at this time, the first dust suction hole 2101 is connected with the second dust suction hole 2202 to form a dust suction port, and dust enters the ventilation cavity from the dust suction port along the direction of arrow Z; when the inner rotating wheel 210 rotates at a relatively high speed and the spring ring 610 is deformed, the positional relationship between the mounting column 211 and the spring ring 610 and the mounting groove 2203 is as shown in FIG. Figure 8 As shown, the limit block 212 gradually moves toward the B side of the second dust suction hole 2202. When the rotation speed of the inner wheel 210 is greater than the threshold, the limit block 212 abuts against the B side of the second dust suction hole 2202. At this time, the inner wheel 210 can drive the outer wheel 220 to rotate through the limit block 212, so as to avoid the edges of the mounting column 211 applying a large force to the spring coil 610 when the rotation speed of the inner wheel 210 is relatively high, causing the mounting column 211 to slip and rotate relative to the spring coil 610.

[0060] refer to Figure 2 The groove surface of the machining annular groove 2201 is a grinding surface for grinding the workpiece. A portion of the stop block 212 extends into the second dust suction hole 2202, and the end surface of the stop block 212 away from the axis of the inner rotating wheel 210 is a machining surface 2121, which is an arc surface and is aligned with the groove surface of the machining annular groove 2201, and is used to widen the grinding surface to improve the grinding effect of the outer rotating wheel 220 on the workpiece.

[0061] In one embodiment, the cross section of the limiting block 212 is in a stepped shape, and the outer rotating wheel 220 is provided with a limiting groove 2204 that cooperates with the limiting block 212. The stepped limiting block 212 allows the limiting block 212 to be tightly engaged with the limiting groove 2204, and the limiting effect is better.

[0062] In one of the embodiments, it also includes a processor and a detection component; the detection component is used to detect the size of the suction port; the drive component 500 and the detection component are both electrically connected to the processor.

[0063] The external air extraction device can be electrically connected to the processor. When the inner rotating wheel 210 rotates so that the spring coil 610 abuts against the side wall of the installation groove 2203, the area of ​​the dust suction port detected by the detection component is the initial area of ​​the dust suction port. At this time, the detection component transmits the detection signal to the processor, and the processor controls the air extraction device to work; when the rotation speed of the inner rotating wheel 210 gradually increases, the area of ​​the dust suction port gradually increases. At this time, after the detection component transmits the detection signal to the processor, the processor controls the air extraction device to gradually increase the power. The larger the opening of the dust suction port, the greater the power of the air extraction device, so as to absorb more dust. When the driving component 500 stops working, the rotation speed of the inner rotating wheel 210 gradually decreases, the area of ​​the dust suction port gradually decreases, and the processor controls the air extraction device to gradually reduce the power; when the area of ​​the dust suction port is reduced to the initial area, the detection component transmits a signal to the processor, and the processor controls the air extraction device to stop working.

[0064] In one embodiment, the detection component includes a pressure sensor electrically connected to the processor; one end of the pressure sensor is set on the limit block 212, and the other end of the pressure sensor is set at the bottom of the limit groove 2204, and the pressure sensor is used to detect the pressure between the inner rotating wheel 210 and the outer rotating wheel 220.

[0065] When the spring coil 610 just abuts against the side wall of the installation groove 2203, the pressure value detected by the pressure sensor is the initial value; as the rotation speed of the inner wheel 210 increases, the pressure value detected by the pressure sensor increases. The larger the pressure value detected by the pressure sensor, the larger the opening of the dust suction port. At this time, the processor can control the exhaust device to work in a high-power state to absorb dust.

[0066] In other embodiments, the detection component may further include a photoelectric sensor electrically connected to the processor, wherein the photoelectric sensor is disposed on the outside of the outer rotating wheel 220 and is used to measure the aperture size of the suction port.

[0067] In one embodiment, the drive assembly 500 includes a hollow shaft motor; the ventilation pipe group includes a first pipe 410; the hollow shaft motor is fixed on the bracket 300; one end of the first pipe 410 is transmission connected to the hollow shaft motor, and the other end of the first pipe 410 is fixedly connected to the inner rotor 210; the first pipe 410 is connected to the ventilation cavity.

[0068] The first tube 410 passes through the hollow shaft motor and is connected to the rotating shaft of the hollow shaft motor. One end of the first tube 410 away from the inner rotating wheel 210 can be rotatably connected to the frame. The hollow shaft motor drives the inner rotating wheel 210 to rotate through the first tube 410 .

[0069] In one embodiment, the ventilation pipe assembly further includes a second pipe 420 ; the second pipe 420 is fixed on the bracket 300 and communicated with the first pipe 410 ; the second pipe 420 is used to connect to the exhaust device.

[0070] refer to Figure 3 When the outer rotating wheel 220 is grinding the rounded corners of the plate, the exhaust device exhausts the ventilation cavity through the first tube 410 and the second tube 420, and the dust generated by the processing enters the ventilation cavity from the dust suction port and is then discharged through the first tube 410 and the second tube 420.

[0071] Working process of the rounded corner sander 100:

[0072] In the initial state, the hollow shaft motor is not started, at which time the inner rotating wheel 210 and the outer rotating wheel 220 are both in a stationary state, and the limit block 212 is located at any position of the line connecting point A to point C in the second dust suction hole 2202.

[0073] When the limit block 212 abuts against the A side of the second dust suction hole 2202, the outer wall of the inner rotating wheel 210 and the limit block 212 close the second dust suction hole 2202, the edges of the mounting column 211 and the spring ring 610 are aligned with the edges of the mounting groove 2203, and the spring ring 610 does not contact the side wall of the mounting groove 2203.

[0074] When the hollow shaft motor is started, the hollow shaft motor drives the inner rotating wheel 210 to rotate, and the mounting column 211 drives the spring ring 610 to rotate. The limit block 212 moves from the A side of the second dust suction hole 2202 to the B side of the second dust suction hole 2202. When the limit block 212 moves to the C side of the second dust suction hole 2202, refer to Figure 7 , the corners of the spring ring 610 just start to abut against the side wall of the mounting groove 2203; the positional relationship between the limit block 212 and the second dust suction hole 2202 is as shown in FIG. Figure 5 As shown, at this time, the first dust suction hole 2101 is connected to the second dust suction hole 2202. When the limit block 212 is at point C, the dust suction port area detected by the detection component is the initial area of ​​the dust suction port. At this time, the detection component transmits the detection signal to the processor, and the processor controls the air extraction device to start working.

[0075] It should be noted that when the limit block 212 is located between point A and point C in the second dust suction hole 2202, the first dust suction hole 2101 is connected to the second dust suction hole 2202, rather than the limit block 212 moving to point C, the first dust suction hole 2101 is connected to the second dust suction hole 2202.

[0076] As the speed of the hollow shaft motor increases, the speed of the inner wheel 210 increases, and the spring ring 610 deforms due to the centrifugal force. Figure 8, at this time, the corners of the spring coil 610 shrink toward the center of the spring coil 610, for example, in the direction of arrow Q; the straight edge of the spring coil 610 expands toward the outside of the spring coil 610, for example, in the direction of arrow P. The abutment position of the spring coil 610 with the side wall of the installation groove 2203 changes, and at this time, the limit block 212 gradually moves from the C of the second dust suction hole 2202 to the B side of the second dust suction hole 2202. The area of ​​the dust suction port gradually increases. At this time, after the detection component transmits the detection signal to the processor, the processor controls the exhaust device to gradually increase the power. The larger the opening of the dust suction port, the greater the power of the exhaust device, so as to absorb more dust.

[0077] When the speed of the hollow shaft motor is greater than the threshold, the limit block 212 abuts against the B side of the second dust suction hole 2202. At this time, the inner rotating wheel 210 can drive the outer rotating wheel 220 to rotate through the limit block 212. At this time, the processor controls the exhaust device to maintain a certain power for exhaust.

[0078] When the hollow shaft motor stops working, the rotation speed of the inner wheel 210 gradually decreases, the centrifugal force of the spring coil 610 becomes smaller, and the spring coil 610 gradually returns to its initial state until the inner wheel 210 stops rotating, the area of ​​the dust suction port gradually decreases, and the processor controls the exhaust device to gradually reduce the power; when the area of ​​the dust suction port is reduced to the initial area, the detection component transmits a signal to the processor, and the processor controls the exhaust device to stop working.

[0079] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-described embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A plate rounding sander, characterized in that: include: Bracket; A ventilation pipe set, used to connect the air extraction device; An inner rotating wheel, the inner rotating wheel is rotatably connected to the bracket; the inner rotating wheel is provided with a ventilation cavity connected to the ventilation pipe group and a plurality of circumferentially arranged first dust suction holes, the first dust suction holes are connected to the ventilation cavity; An outer rotating wheel, wherein the outer rotating wheel is sleeved on the outer side of the inner rotating wheel; the outer rotating wheel is provided with an inclined portion, and the long side of the inclined portion intersects with the inner hole circle of the outer rotating wheel; the outer rotating wheel is provided with a processing annular groove for grinding the fillet of the plate and a plurality of circumferentially arranged second dust suction holes, the second dust suction holes are connected with the processing annular groove; the opening formed by the connection between the first dust suction hole and the second dust suction hole is a dust suction port; A driving assembly, used for driving the inner rotating wheel to rotate relative to the bracket; An elastic component, wherein the elastic component includes an expansion part and a contraction part movably connected to the inner rotating wheel, and when the inner rotating wheel rotates, the contraction part abuts against the inclined part and drives the outer rotating wheel to rotate; when the rotation speed of the inner rotating wheel is greater than a threshold, the expansion part moves away from the center of the circle under the action of centrifugal force and drives the contraction part to contract toward the center of the circle, and at this time, the contraction part rotates relative to the outer rotating wheel by an angle φ and then abuts against the inclined part, and the opening of the dust suction port increases; The elastic component also includes a spring coil; The shaft end of the inner rotating wheel is provided with a mounting column with an N-gonal cross section, and the spring ring is sleeved on the outside of the mounting column; the corners of the spring ring are the contraction part, and the edges of the spring ring are the expansion part; the outer rotating wheel is provided with a mounting groove with an N-gonal cross section; the side wall of the mounting groove is the inclined part; Let the radius of the circumscribed circle of the installation groove be a, the radius of the inscribed circle of the installation groove be b, and the radius of the circumscribed circle of the spring ring be c, then a>c>b.

2. The plate rounding sander according to claim 1, characterized in that: The elastic component also includes a buffer ring, which is sleeved on the mounting post and located between the mounting post and the spring ring.

3. The plate rounding sander according to claim 1, characterized in that: The outer rotating wheel comprises a detachably connected wheel body and a cover plate; the wheel body is sleeved on the inner rotating wheel, and the wheel body is provided with the second dust suction hole and the mounting groove; the cover plate is used to cover the mounting groove.

4. The plate rounding sander according to claim 1, characterized in that: A plurality of limit blocks are arranged on the circumference of the inner rotating wheel, and the limit blocks pass through the second dust suction holes.

5. The plate rounding sander according to claim 4, characterized in that: The cross section of the limiting block is in a stepped shape, and the outer rotating wheel is provided with a limiting groove matched with the limiting block.

6. The plate rounding sander according to claim 5, characterized in that: It also includes a processor and a detection component; the detection component is used to detect the size of the suction port; the drive component and the detection component are both electrically connected to the processor.

7. The plate rounding sander according to claim 6, characterized in that: The detection component includes a pressure sensor electrically connected to the processor; one end of the pressure sensor is arranged on the limit block, and the other end of the pressure sensor is arranged at the bottom of the limit groove, and the pressure sensor is used to detect the pressure between the inner rotating wheel and the outer rotating wheel.

8. The plate rounding sander according to claim 1, characterized in that: The driving assembly includes a hollow shaft motor; the ventilation pipe group includes a first pipe; the hollow shaft motor is fixed on the bracket; one end of the first pipe is drivingly connected to the hollow shaft motor, and the other end of the first pipe is fixedly connected to the inner rotating wheel; The first tube is in communication with the ventilation cavity.

9. The plate rounding sander according to claim 8, characterized in that: The ventilation pipe group also includes a second pipe; the second pipe is fixed on the bracket and communicated with the first pipe; the second pipe is used to connect to the air extraction device.

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