A polishing machine

Abstract

This utility model discloses a polishing machine, including a housing, a drive unit, an impeller, and a working head. The housing has an opening; the drive unit is connected to the housing; the impeller is disposed inside the housing and is driven to rotate by the drive unit, with at least a portion of the airflow generated by the impeller's rotation directed towards the opening; the working head is disposed at the opening and is driven to rotate by the drive unit. The working head includes an outer end face and an outer peripheral surface connected to the outer end face. An air outlet gap is formed between the working head and the opening end of the housing for airflow to pass through, and at least a portion of the airflow passing through the air outlet gap passes over the outer peripheral surface. When the impeller rotates, the airflow it generates can blow away the waste residue produced during polishing, thereby improving polishing efficiency and polishing effect.

Description

Technical Field

[0001] This utility model relates to the field of surface polishing technology, and in particular to a polishing machine. Background Technology

[0002] Polishing machines, also known as grinding machines, are commonly used for mechanical grinding and polishing. A polishing machine generally includes a drive unit, a working head, and a transmission mechanism connecting the drive unit and the working head. The drive unit is, for example, an electric motor or a pneumatic motor. The power of the drive unit drives the working head to rotate through the transmission mechanism, and the working head contacts the workpiece to grind the workpiece surface.

[0003] The inventors discovered that there were some areas for improvement in the polishing machine's operation:

[0004] For example, during polishing operations, water, polishing fluid, or other liquids need to be sprayed onto the workpiece surface. When the polishing head grinds the workpiece, the liquid may seep into the polishing machine, adversely affecting internal components such as bearings. This significantly reduces the polishing machine's lifespan, requiring frequent replacement of bearings and other parts. Furthermore, the residue (or waste material) generated during polishing remains on the workpiece surface. Polishing with the working head on surfaces containing residue not only reduces polishing efficiency but also affects the polishing effect.

[0005] For example, during the polishing process, reliable contact between the polishing head and the workpiece surface has a significant impact on the polishing effect. If the contact force between the polishing head and the workpiece surface is too large, it can easily damage both the polishing head and the workpiece; in severe cases, it may cause the motor to seize up, increase the motor current, or even destroy the motor. Conversely, if the contact force is too small, the polishing effect will be poor.

[0006] For example, for polishing machines that use electric motors, the heat generated by the motor during operation needs to be dissipated in a timely manner, otherwise it may affect the service life of the motor and the reliability of its operation.

[0007] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0008] The purpose of this invention is to provide a polishing machine that improves the service life of the polishing machine.

[0009] To achieve the above-mentioned objectives, this utility model proposes a polishing machine, comprising:

[0010] The outer casing has an opening;

[0011] The drive unit is connected to the housing;

[0012] An impeller, disposed within the housing, is driven to rotate by the drive device, and the airflow generated by the rotation of the impeller is discharged at least partially through the opening; and

[0013] A working head is located at the opening and is driven to rotate by the driving device. The working head includes an outer end face and an outer peripheral surface connected to the outer end face. An air outlet gap is formed between the working head and the opening end of the housing to allow airflow to pass through. The airflow passing through the air outlet gap passes at least partially through the outer peripheral surface.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] According to at least one embodiment of the present invention, a polishing machine includes an impeller driven to rotate by a drive device. The airflow generated by the rotation of the impeller is at least partially discharged through an opening. A working head is disposed at the opening of the outer casing. An air outlet gap is formed between the working head and the opening end of the outer casing for airflow to pass through. The airflow passing through the air outlet gap passes at least partially over the outer peripheral surface. When the impeller rotates, the airflow it generates can blow onto the workpiece surface outside the working head, which is beneficial for blowing away the residue generated during polishing and avoiding grinding on workpieces with waste residue, thereby improving the polishing effect and polishing efficiency. At the same time, the airflow discharged from the air outlet gap can effectively prevent external liquid from entering through the opening, thereby protecting the internal components and improving the service life of the polishing machine. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a polishing machine according to some embodiments of this utility model.

[0017] Figure 2 yes Figure 1 The image shows a cross-sectional view of the polishing machine.

[0018] Figure 3 This is a cross-sectional view of the working head in some embodiments of this utility model.

[0019] Figure 4 This is a cross-sectional view of the working head in some embodiments of this utility model.

[0020] Figure 5 This is a three-dimensional schematic diagram of a polishing machine according to some embodiments of this utility model.

[0021] Figure 6 yes Figure 5 The image shows a cross-sectional view of the polishing machine.

[0022] Figure 7 yes Figure 1 The diagram shown is a three-dimensional representation of the polishing machine without its outer casing or other components.

[0023] Figure 8 yes Figure 1The diagram shows a three-dimensional view of the polishing machine when the rear end component is removed.

[0024] Figure 9 This is a three-dimensional schematic diagram of a polishing machine according to some embodiments of this utility model.

[0025] Figure 10 yes Figure 9 The image shows a cross-sectional view of the polishing machine.

[0026] Figure 11 yes Figure 10 Enlarged view of section I in the middle.

[0027] Figure 12 yes Figure 10 A three-dimensional schematic diagram of the intermediate impeller.

[0028] Figure 13 yes Figure 9 A three-dimensional schematic diagram of the inner shell.

[0029] Figure 14 yes Figure 9 The diagram shows the positions of the blades and connecting parts of the polishing machine.

[0030] Figure 15 This is a three-dimensional schematic diagram of a polishing machine according to some embodiments of this utility model.

[0031] Figure 16 yes Figure 15 The image shows a cross-sectional view of the polishing machine.

[0032] Figure 17 yes Figure 15 A schematic diagram showing the positions of components such as the impeller, casing, and heat sink.

[0033] Figure 18 This is a schematic diagram of a polishing machine according to some embodiments of this utility model.

[0034] Figure 19 yes Figure 18 The image shows a cross-sectional view of the front end of the polishing machine.

[0035] Figure 20 yes Figure 18 A three-dimensional schematic diagram of the inner shell.

[0036] Figure 21 yes Figure 20 The cross-sectional view of the casing shown.

[0037] Figure 22 yes Figure 20 The diagram shows a front air vent in the casing when it is horizontally positioned.

[0038] Figure 23 yes Figure 22 The cross-sectional view of the casing shown.

[0039] Figure 24 This is a three-dimensional schematic diagram of a polishing machine according to some embodiments of this utility model.

[0040] Figure 25 yes Figure 24 A cross-sectional view of a polishing machine.

[0041] Figure 26 This is a three-dimensional schematic diagram showing the connection between the transmission mechanism and the rotating shaft and impeller in some embodiments of this utility model.

[0042] Figure 27 This is a three-dimensional schematic diagram showing the connection between the transmission mechanism and the rotating shaft and impeller in some embodiments of this utility model.

[0043] Figure 28 This is a cross-sectional schematic diagram of the transmission mechanism in some embodiments of this utility model, where the connecting seat is not shown.

[0044] Figure 29 This is a three-dimensional schematic diagram showing the connection between the transmission mechanism and the rotating shaft and impeller in some embodiments of this utility model.

[0045] Figure 30 This is a perspective view of a polishing machine according to some embodiments of the present invention. In the figure, the polishing machine is provided with working heads at both ends.

[0046] Figure 31 yes Figure 30 The diagram shows a cross-sectional view of the polishing machine. Detailed Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0048] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] This utility model proposes a polishing machine, such as Figure 1 and Figure 2 As shown, it includes a housing 1, a drive unit 2, an impeller 3, and a working head 4.

[0051] The drive unit 2 is connected to the housing 1. The drive unit 2 can be, for example, an electric motor or a pneumatic motor. The drive unit 2 has a rotating shaft 21, which can generate rotational motion, thereby driving the impeller 3 and the working head 4 to rotate. The drive unit 2 and the housing 1 are fixedly connected, for example, by bolts.

[0052] The outer casing 1 has an opening 10, and the working head 4 is located at the opening 10 and is driven to rotate by the drive device 2. The working head 4 includes an outer end face 40 and an outer peripheral surface 41 connected to the outer end face 40. Depending on the actual situation, the working head 4 can directly contact the workpiece to perform grinding operations, or a working attachment (such as sandpaper) can be set on the outer end face 40 of the working head 4, and the grinding operation can be performed through the contact of the working attachment with the workpiece. When the working head 4 contacts the workpiece (including direct contact with the outer end face 40 and contact through the working attachment), and the working head 4 rotates, the outer surface of the workpiece can be ground or polished.

[0053] The working head 4 has at least its outer end face 40 located outside the opening 10, that is, the outer end face 40 protrudes outside the opening 10 in the axial direction of the rotating shaft 21, so as to facilitate the contact between the working head 4 and the workpiece.

[0054] Impeller 3 is also driven to rotate by drive device 2. When impeller 3 rotates, it generates airflow. The air pressure is increased due to the centrifugal force of rotation and the diffusion effect of impeller 3. The airflow generated by the rotation of impeller 3 is at least partially directed towards opening 10, and can then be discharged from opening 10. Specifically, an air outlet gap 100 is formed between the opening end 11 of the outer casing 1 and the working head 4 to allow airflow to pass through. The air in opening 10 is blown out from the air outlet gap 100. As a feasible example, impeller 3 is an axial flow impeller, which mainly generates axial wind force. That is, the axial wind force generated by impeller 3 is greater than the radial wind force it generates, so that the airflow can be efficiently discharged from opening 10, increasing the wind force blown out from air outlet gap 100. Optionally, the axial wind force generated by impeller 3 is more than twice the radial wind force. As another feasible example, the impeller 3 primarily generates radial airflow (e.g., a centrifugal impeller), which is then guided by the casing 1 to convert the airflow into axial airflow, which is then blown out from the outlet gap 100. It is understood that the axial and radial airflow can be adjusted by modifying the shape and mounting angle of the blades 30 of the impeller 3.

[0055] In some embodiments, the airflow blown out from the air gap 100 passes at least partially over the outer peripheral surface 41, so that the airflow can blow over the outer peripheral surface 41 and along the outer peripheral surface 41 to the workpiece surface. In this way, the airflow can remove all or part of the residue on the outer peripheral surface 41 and the workpiece surface near the working head 4, thereby improving the grinding efficiency (or polishing efficiency) and helping to avoid grinding on workpieces with waste residue, thereby improving the polishing effect.

[0056] In some embodiments, the outer contour of the projection of the opening 10 along the axial direction of the drive device 2 is at least partially located on the outer peripheral surface 41 of the working head 4 or at least partially located outside the outer peripheral surface 41 of the working head 4. The axis of the drive device 2 is the axis of the rotating shaft 21 of the drive device 2, that is, the axis 210 shown in the figure. The impeller 3 rotates around the axis 210, and the high-pressure air generated by its rotation is discharged from the air outlet gap 100 between the opening end 11 of the housing 1 and the working head 4. The opening end 11 refers to the end of the housing 1 where the opening 10 is provided.

[0057] refer to Figure 2 , Figure 2 The outline of the projection of opening 10 is shown in dashed lines. When the outline of the projection of opening 10 along the axis of the drive device 2 is located outside the outer peripheral surface 41 of the working head 4, part of the airflow blowing out from opening 10 directly blows onto the workpiece on the outer periphery of the working head 4, and part blows onto the workpiece along the outer peripheral surface 41, thereby blowing away debris, dust and other residues on the workpiece surface, improving grinding efficiency (or polishing efficiency), and avoiding grinding on workpieces with waste residue, thus improving the polishing effect. Similarly, see reference. Figure 6 , Figure 6 The area of ​​the outer contour of the projection of the opening 10 is also shown in dashed lines. When the outer contour of the projection of the opening 10 along the axial direction of the drive device 2 is at least partially located on the outer peripheral surface 41 of the working head 4, the airflow blown out from the opening 10 can be blown along the outer peripheral surface 41 of the working head 4 to the workpiece surface, and can also blow away the residue near the working head 4, thereby improving the grinding efficiency and grinding quality (or polishing efficiency and polishing quality / effect).

[0058] Obviously, when the outer contour of the projection of the opening 10 along the axial direction of the drive device 2 is located outside the outer peripheral surface 41 of the working head 4 and partially on the outer peripheral surface 41 of the working head 4, it can still achieve similar beneficial effects.

[0059] It should also be noted that the airflow discharged from the air gap 100 effectively prevents external liquids (such as water or polishing fluid used during polishing) from entering the polishing machine through the opening 10. Even if liquid is present at the opening 10, it can be blown outwards, thus preventing liquid from invading the polishing machine and affecting the normal operation of internal components (bearings). This improves the reliability of the polishing machine and extends its service life. Furthermore, since the airflow can directly reach the outer peripheral surface 41 of the working head 4, it helps prevent residues (including liquids) from accumulating on the outer peripheral surface 41 of the working head 4. This plays a more positive role in preventing residues from invading the polishing machine and improving the polishing effect. In some embodiments, the cross-sectional area of ​​the outer peripheral surface 41 of the working head 4 gradually decreases from the outer end face 40 towards the side where the drive device 2 is located. The cross-section refers to the section obtained by cutting the outer peripheral surface 41 with a plane perpendicular to the axis 42 of the working head 4. The area of ​​this section is the cross-sectional area of ​​the outer peripheral surface 41 of the working head 4 at a certain position. In this way, the outer peripheral surface 41 of the working head 4 can guide the airflow blown out from the opening 10 to the surface of the workpiece, making it easier to blow away the residue on the outer peripheral surface 41, while generating a lateral force to blow away the residue, which can more efficiently remove the waste residue.

[0060] The cross-sectional area of ​​the outer peripheral surface 41 of the working head 4 can be set to gradually decrease from the outer end face 40 toward the side where the drive device 2 is located, which can be achieved in various ways. The outer contour of the longitudinal section of the outer peripheral surface 41 of the working head 4 is the first outer contour, where the longitudinal section refers to the section obtained by cutting the outer peripheral surface 41 with a plane passing through the axis 42 of the working head 4. In some embodiments, the first outer contour includes a diagonal and / or curved portion, and the first outer contour gradually approaches the axis 210 of the drive device 2 from the outer end face 40 toward the side where the drive device 2 is located. For example, refer to Figure 3 The first outer contour can be oblique, in which case it forms a cone shape that gradually expands outward. For example, see reference... Figure 4The first outer contour can be curved, optionally with an inward curve, to generate more lateral wind force and better guide airflow to blow away residue on the first outer contour. Of course, in other embodiments, the curve can also be convex. It is understood that the first outer contour can also include both oblique and curved portions, see reference... Figure 2 .

[0061] The inner surface 110 of the opening end 11 of the outer casing 1 can be tapered, gradually widening outwards (see reference). Figure 2 It can also be in the form of a straight tube parallel to the axis 210 of the drive unit 2 (see reference). Figure 6 , Figure 10 , Figure 16 , Figure 19 and Figure 25 The conical inner surface 110 can generate lateral wind force, thereby efficiently carrying away waste residue. Of course, the straight tubular inner surface 110 can also blow away waste residue. When combined with the inclined first outer contour, it can also generate lateral wind force.

[0062] The inner contour of the longitudinal section of the opening end 11 of the outer casing 1 is the first inner contour, and the longitudinal section of the inner surface 110 refers to the contour obtained by cutting the inner surface 110 with a plane passing through the axis 210. In some embodiments, reference is made to... Figure 2 The first outer contour is oblique, and the first inner contour is also oblique. The distances between the first outer contour and the first inner contour and the axis 210 of the driving device 2 gradually increase outwards. The angle between the first outer contour and the axis 210 is a first angle α1, and the angle between the first inner contour and the axis of the driving device 2 is a second angle α2. The first angle α1 is smaller than the second angle α2, which allows the airflow blown from the opening 10 to be more concentrated towards the area outside the working head 4, further improving the efficiency of blowing away waste residue. In other embodiments, refer to... Figure 6 , Figure 10 , Figure 16 , Figure 19 and Figure 25 The first outer contour is oblique, and the distance between the first outer contour and the axis 210 of the drive device 2 gradually increases outward. The first inner contour is straight and parallel to the axis 210 of the drive device 2. The airflow can be blown more concentratedly onto the outer peripheral surface 41 of the working head 4, which can improve the efficiency of blowing away the residue on the outer peripheral surface 41 and better prevent the residue from entering the polishing machine.

[0063] In some embodiments, the working head 4 has a circular cross-section, and its outer peripheral surface 41 is formed by rotating a first outer contour around the axis 42 of the working head 4. The inner wall of the outer shell 1 also has a circular cross-section. In other embodiments, the working head 4 has a rectangular cross-section, and the inner wall of the outer shell 1 also has a rectangular cross-section. Optionally, the cross-section of the working head 4 and the cross-section of the inner wall of the outer shell 1 have the same shape, for example, both are circular or both are rectangular. Of course, their shapes can also be different, for example, one has a rectangular cross-section and the other has a circular cross-section.

[0064] In some embodiments, in the axial direction of the drive device 2, the inner wall of the portion of the housing 1 located at least outside the blades 30 of the impeller 3 does not have an inwardly protruding portion (e.g., a plate-like or block-like portion) to prevent the corners created by the protruding portion from obstructing axial airflow. Optionally, in the axial direction of the drive device 2, the inner wall of the portion of the housing 1 located at least outside the blades 30 of the impeller 3 does not retract toward the axis of the drive device 2. "Outer" refers to the position relatively close to the opening end (or working head, workpiece) of the housing 1. That is, in the axial direction of the drive device 2, the distance between the inner wall of the portion of the housing 1 located outside the blades 30 of the impeller 3 and the axis 210 remains unchanged or increases toward the opening end 11 without shrinking, so as to reduce obstruction to airflow and ensure the airflow force blown out from the opening 10. Optionally, in some embodiments, in the axial direction of the drive device 2, the portion of the housing 1 located at least outside the front end cover 230 of the drive device 2 does not retract toward the axis of the drive device 2.

[0065] In some embodiments, the drive device 2 is a motor, which generates heat during operation and requires timely heat dissipation. For example... Figure 2 As shown, the drive unit 2 is located inside the housing 1, and the housing 1 surrounds the outside of the drive unit 2. The housing 1 is provided with a rear air inlet 120, which is located at the tail of the polishing machine. The tail of the polishing machine can be understood as the last third of the polishing machine. Specifically, the distance between the outer end face 40 and the end face 43 of the polishing machine is L, which can be understood as the total length of the polishing machine. The last third of the polishing machine refers to the portion of one-third of the length L from the end face 43 toward the side where the working head 4 is located. The housing 1 surrounds the housing 20 of the drive unit 2 and is spaced apart from the housing 20. The two form a gas flow channel 13 that communicates with the opening 10 and the rear air inlet 120. When the impeller 3 rotates, it generates a suction force, and the external airflow is drawn in through the rear air inlet 120, passes through the gas flow channel 13, and is blown out from the opening 10. Since the airflow flows over the outer surface of the motor, it can efficiently remove the heat from the motor surface, achieving a more efficient cooling effect and improving the stability and reliability of the motor operation. Understandably, the further back the rear air intake 120 is, the more fully the airflow can pass over the surface of the housing 20, resulting in better heat dissipation.

[0066] The rear air intake 120 can be positioned opposite to the outer surface of the housing 20 of the drive unit 2, for reference. Figure 9 and Figure 10 , Figure 9 and Figure 10 In the illustrated embodiment, the rear air intake 120 directly faces the outer surface of the housing 20, and gas enters the gas flow channel 13 directly from the rear air intake 120. The rear air intake 120 can also be positioned opposite the rear end face 2310 of the drive device 2, such as... Figure 2 , Figure 7 and Figure 8 As shown, Figure 7 yes Figure 2 The diagram shown is a three-dimensional representation of the polishing machine without the outer casing 1. Figure 8 yes Figure 2 The diagram shown illustrates the polishing machine when the rear end component 6 is removed. The drive unit 2 includes a front cover 230 and a rear cover 231. The end of the drive unit 2 facing the working head 4 is the front end, and the other end is the rear end. The front cover 230 and the rear cover 231 are located at the front and rear ends of the drive unit 2, respectively (excluding the protruding rotating shaft 21). The housing 20 is connected between the front cover 230 and the rear cover 231. The rear cover 231 has a through hole 2311 communicating with the rear air inlet 120. After the gas enters from the rear air inlet 120, it passes through the through hole 2311 into the gas flow channel 13. It is understood that the through hole 2311 can also be provided on the front cover 230 to facilitate gas flow, for example... Figure 10 In the illustrated embodiment, the front cover 230 and the inner wall of the outer shell 1 are fitted together. At this time, a through hole 2311 is provided in the front cover 230 to ensure the smooth flow of air and increase the overall structural strength.

[0067] To further improve heat dissipation, optionally, the housing 20 of the drive unit 2 may be made of a metal material, such as aluminum alloy, which has good thermal conductivity, thereby improving heat dissipation. Further optionally, refer to... Figure 7 , Figure 16 and Figure 17 The housing 20 is provided with protruding heat dissipation teeth 201 for heat dissipation. Optionally, the heat dissipation teeth 201 extend along the axis 210 of the drive device 2 and are consistent with the direction of the gas flow channel 13, which can accelerate the airflow speed, increase the heat dissipation area, and thus improve the heat dissipation efficiency.

[0068] In some embodiments, reference Figures 9 to 11The outer casing 1 is provided with an air outlet 122 connecting its inner and outer sides. The position of the air outlet 122 corresponds to the blades 30 of the impeller 3, that is, the air outlet 122 is at least partially arranged radially opposite to the blades 30, where radial refers to the direction perpendicular to the axis 210. When the impeller 3 rotates, the blades 30 simultaneously generate airflow from the opening 10 and the air outlet 122. In this way, the overall air output efficiency is higher, which can improve the heat dissipation effect. At the same time, it can reduce the distance between the impeller 3 and the inner wall of the outer casing 1, improve the pressurization effect of the impeller 3, and make the airflow from the opening 10 faster.

[0069] like Figures 10 to 13 As shown, in some embodiments, the impeller 3 includes a base plate 31, blades 30 extending from the base plate 31 toward the side where the drive device 2 is located, and a guide section 32 extending from the outer edge of the base plate 31 toward the side away from the drive device 2. The guide section 32 extends toward the side where the outer casing 1 is located, and its longitudinal section is an arc shape concave toward the side where the working head 4 is located. The longitudinal section of the guide section 32 refers to the section obtained by cutting the guide section 32 through the axis 210. The outer casing 1 includes a first part 1a and a second part 1b. The radial dimension of the first part 1a is smaller than the radial dimension of the second part 1b. The drive device 2 is at least partially housed in the first part 1a, the impeller 3 is disposed in the second part 1b, and the opening 10 is disposed on the second part 1b. It should be noted that when the cross-section of the component is circular, the radial dimension is its diameter. When the cross-section of the component is of other shapes, the radial dimension can be understood as the distance between the two points on the outer contour of the cross-section that are furthest apart. The second part 1b includes a straight tube-shaped annular portion 160, a conical annular portion 161 spaced apart from the annular portion 160 along the axial direction of the drive device 2, and a plurality of (in this document, unless otherwise specified, "a plurality of" means at least two) spaced connecting pieces 162 connecting the annular portion 160 and the conical annular portion 161, with an air vent 122 formed between two adjacent connecting pieces 162.

[0070] The cross-sectional area of ​​the conical ring portion 161 gradually increases towards the side where the working head 4 is located. The blade 30 includes a first inclined portion 300 corresponding to the conical ring portion 161 and a second inclined portion 301 at least partially corresponding to the air outlet 122. The air guide portion 32 is at least partially corresponding to the annular portion 160. When the impeller 3 rotates, part of the airflow is discharged from the air outlet 122, and part of it is discharged along the air guide portion 32 from the air gap between the air guide portion 32 and the annular portion 160, and then blown out from the opening 10. Figure 11 The arrows in the middle indicate the direction of airflow.

[0071] Optionally, the portion of the blade 30 furthest from the axis 210 of the drive device 2 (distal end) is deflected relative to the portion of the blade 30 closest to the axis 210 of the drive device 2 (proximal end), and the portion of the connecting piece 162 furthest from the axis 210 of the drive device 2 (distal end) is also deflected relative to the portion of the connecting piece 162 furthest from the axis 210 of the drive device 2 (proximal end). This deflection means that the distal end of the blade 30 or the connecting piece 162 is biased towards the side of the line connecting the proximal end and the axis 210 of the drive device 2 compared to the proximal end. Figure 14 As shown, the deflection directions of blade 30 and connecting plate 162 are opposite. Specifically, in the figure, there is a line 30b connecting the proximal end 30a of blade 30 to axis 210, and the distal end 30c of blade 30 is deflected to the counterclockwise side of line 30b. Similarly, there is a line 162b connecting the proximal end 162a of connecting plate 162 to axis 210, and the distal end 162c of connecting plate 162 is deflected to the clockwise side of line 162b. When blade 30 rotates clockwise around axis 210, airflow can be discharged more efficiently from outlet 122. It can be understood that the deflection directions of blade 30 and connecting plate 162 can also be opposite to those of connecting plate 162. Figure 14 Conversely, as shown in the diagram, only the rotation direction of the impeller needs to be adjusted.

[0072] Understandable Figures 9 to 14 In the illustrated embodiment, because a conical ring portion 161 corresponding radially to the blade 30 is provided, a portion of the radial airflow generated by the impeller 3 can be guided axially through the conical ring portion 161. Furthermore, by providing the connecting plate portion 162, it is beneficial to convert more radial airflow into axial airflow. Even if the axial airflow generated by the impeller 3 is less than or equal to the radial airflow (e.g., in a centrifugal impeller), sufficient axial airflow can be generated to be blown out from the outlet gap 100.

[0073] In some embodiments, such as Figures 15 to 17 As shown, the polishing machine also includes a heat sink 6 disposed within the housing 1. The heat sink 6 is located at the end of the housing 20 near the impeller 3, and between the impeller 3 and the front cover 230. Optionally, the heat sink 6 is connected to the front cover 230 of the drive unit 2. The heat sink 6 includes an annular tube 60 and multiple heat sink fins 62 connected to the outside of the tube 60. The heat sink fins 62 are spaced apart, for example, they can be arranged in an array centered on the axis of the tube 60. After the airflow is blown out from the gas flow channel 13, it passes through the heat sink fins 62, thereby carrying away the heat from the heat sink fins 62. By adding the heat sink 6, the heat dissipation effect at the front end of the drive unit 2 can be further improved. Optionally, the heat sink fins 62 extend along the axis of the drive unit 2 to reduce obstruction to the airflow and improve the air outlet efficiency.

[0074] Optionally, the heat sink 6 is located within the second part 1b of the outer casing 1. Since the second part 1b has a relatively larger space, the volume of the heat sink 6 can be made larger, thereby increasing the area of ​​the heat sink 62 and improving the heat dissipation effect. Optionally, the heat sink 62 of the heat sink 6 is in direct contact with the inner wall of the outer casing 1 to maximize the area of ​​the heat sink 62.

[0075] Figure 16 In the illustrated embodiment, the second part 1b includes a first annular portion 163, a second annular portion 164, and a conical portion 165 connecting the first annular portion 163 and the second annular portion 164. The first annular portion 163 is closer to the drive device 2 than the second annular portion 164. The radial dimension of the first annular portion 163 is smaller than that of the second annular portion 164. The radial dimension of the conical portion 165 gradually increases from the first annular portion 163 towards the second annular portion 164. The radial dimension of the first annular portion 163 is larger than that of the first part 1a. The impeller 3 is located within the first annular portion 163, allowing for a larger blade size. Furthermore, its close proximity to the inner wall of the first annular portion 163 generates greater wind pressure.

[0076] The drive unit 2 can be disposed either inside or outside the housing 1 to reduce the size of the polishing machine, for example, by reducing its radial dimension (diameter). In some embodiments, such as... Figure 5 , Figure 6 , Figure 18 and Figure 19 As shown, Figure 6 for Figure 5 The diagram shows a cross-sectional view of the polishing machine. Figure 19 for Figure 18 The cross-sectional view of the front end of the polishing machine shown is shown. Figure 19 The working head 4 in the middle Figure 5 The working head 4 is closer to the opening 10. In the illustrated embodiment, the outer shell 1 is connected to the front end of the drive device 2. Specifically, the outer shell 1 is connected to the front end cover 230 of the drive device 2. The outer shell 1 is provided with an inlet air hole 121 that communicates with its inner and outer sides. The inlet air hole 121 is located on the side of the impeller 3 near the drive device 2. It and the opening 10 are located on the two sides of the impeller 3, respectively. When the impeller 3 rotates, the airflow is drawn in through the inlet air hole 121 and discharged through the opening 10. Figure 19 The arrows in the diagram indicate the direction of airflow. It can be understood that placing the outer casing 1 at the front end of the drive device 2 can also play a certain role in heat dissipation, for example, it can dissipate heat at the front end of the drive device 2.

[0077] Optional, see reference Figure 18 and Figure 19The opening end 11 of the outer casing 1 has an annular sealed structure, meaning that the outer casing 1 does not have through holes or grooves at the end near the working head 4. This not only better isolates it from the outside, preventing external liquids from entering the interior of the outer casing 1 through the holes or grooves of the opening end 11, but also allows more airflow to be blown out from the opening 10, increasing the airflow rate and velocity, and better removing residues. Optionally, along the axis 210 of the drive device 2, the outer casing 1 has an outer portion located on the side of the blade 30 near the working head 4, and this outer portion of the outer casing 1 has an annular sealed structure to further ensure the effect. It is understood that the polishing machine in other embodiments of this document can also use the aforementioned structure to improve the protective effect through the annular sealed structure at the front end of the outer casing 1.

[0078] The number of front air vents 121 is multiple, and they are spaced apart on the outer casing 1 to make the total area of ​​the front air vents 121 larger, so as to allow for more efficient air intake. Optionally, the front air vents 121 are arranged at equal intervals.

[0079] In some embodiments, such as Figures 18 to 20 As shown, the front air inlet 121 is strip-shaped and is arranged along the axis 210 of the drive unit 2. In other embodiments, such as Figure 22 and Figure 24 As shown, the front air hole 121 is strip-shaped and horizontally positioned (perpendicular to the axis 210 of the drive device 2). In other embodiments, the front air hole 121 may also be inclined, or the front air hole 121 may be other shapes besides strip-shaped, such as round hole, ellipse, etc.

[0080] Figure 18 and Figure 19 In the illustrated embodiment, the outer casing 1 is a straight tube, and its inner wall is parallel to the axis of the drive device 2. Optionally, the outer casing 1 and the drive device 2 are coaxially arranged.

[0081] like Figures 19 to 21 As shown, in some embodiments, the polishing machine further includes a heat sink 6 disposed inside and connected to the housing 1. The heat sink 6 includes a tube 60, a rib 61 connected to the housing 1, and a plurality of heat sink fins 62 disposed on the outer surface of the tube 60. The rib 61 connects the tube 60 and the housing 1. The heat sink fins 62 are correspondingly disposed to the inlet air hole 121, that is, the two are at least partially opposite each other in the radial direction. When the impeller 3 rotates, airflow is drawn in from the inlet air hole 121 and flows through the heat sink fins 62. Since the heat sink fins 62 increase the heat dissipation area, heat dissipation can be performed more efficiently. Optionally, the heat sink fins 62 are disposed along the axis 210 of the drive device 2, which is basically consistent with the airflow direction, so as to reduce the obstruction to the airflow and further improve the heat dissipation effect. It is understood that the heat sink 6 may also not include the rib 61 and be directly connected to the housing 1 through the heat sink fins 62.

[0082] In some embodiments, reference Figure 19 Along the axis 210, the length L1 of the heat sink 62 is greater than the length L2 of the inlet vent 121, and both ends of the heat sink 62 extend beyond the ends of the inlet vent 121 to improve heat dissipation. The length L2 of the heat sink 62 is less than the length of the housing 1, and there is a gap between its front end and the end face of the housing 1 to provide space for mounting the impeller 3, which helps to improve the compactness of the structure and reduce the volume.

[0083] To further improve heat dissipation, the front air vent 121 is positioned close to the bottom of the heat sink 6 (i.e., the end of the heat sink 6 facing away from the working head 4). This allows more airflow to pass over the heat sink 62, thereby improving heat dissipation. To ensure more efficient airflow over the heat sink 62, in some embodiments, such as... Figure 23 As shown, the inlet vent 121 is located on the bottom surface 620 of the heat sink 62, near the working head 4. The furthest distance L3 between the inlet vent 121 and the bottom surface 620 of the heat sink 62 does not exceed 15mm. The furthest distance refers to the distance between the point on the inlet vent 121 furthest from the bottom surface 620 along the axis of the drive device 2 and the bottom surface 620. In other embodiments, the inlet vent 121 is located behind the heat sink 6 (i.e., on the side of the bottom surface 620 of the heat sink 6 facing away from the working head 4), so that the airflow entering from the inlet vent 121 can completely flow through the heat sink 6, thereby improving the heat dissipation effect. Figure 24 and Figure 25 As shown, the heat sink 6 is disposed on the front end face 202 of the housing 20 of the drive device 2. The outer shell 1 partially surrounds the front end of the housing 20 of the drive device 2, forming an annular cavity 14 between the outer shell 1 and the housing 20. The inlet vent 121 is disposed on the portion of the outer shell 1 surrounding the housing 20, and is positioned opposite to the housing 20, thereby placing the inlet vent 121 behind the heat sink 6. Since the airflow entering through the inlet vent 121 flows over a portion of the surface of the drive device 2, the heat dissipation effect can be further improved.

[0084] Both the housing 1 and the heat sink 6 can be made of materials with good heat dissipation properties, such as metal. In some embodiments, for example... Figure 20 In the illustrated embodiment, the housing 1 and the heat sink 6 are integrally formed. In other embodiments, for example... Figure 16 and Figure 25 In the embodiment shown, the outer casing 1 and the heat sink 6 are separate components.

[0085] In some embodiments, the outer shell 1 and the housing 20 are separate units, connected and fixed by means of adhesive bonding, welding, or bolting, such as... Figure 19As shown, the front end of the drive device 2 (specifically, its front end cover 230) is provided with a mounting groove 200. The mounting groove 200 surrounds the outside of the rotating shaft 21 of the drive device 2. The outer shell 1 and the heat sink 6 are fixed within the mounting groove 200 and can be limited by the mounting groove 200 for easy installation. It is understood that when the outer shell 1 and the heat sink 6 are separate, they can be made of the same or different materials. For example, the outer shell 1 can be made of plastic, and the heat sink 6 can be made of metal. In other embodiments, such as... Figure 25 As shown, the outer shell 1 and the housing 20 are integrally formed; furthermore, Figure 25 In the illustrated embodiment, part of the housing 20 is directly exposed to the air.

[0086] In some embodiments, reference Figure 19 The radial distance D1 between the blades 30 of the impeller 3 and the outer casing 1 is smaller than the radial distance D2 between the heat sink 62 and the outer casing 1. The blades 30 are located directly above the gap between the heat sink 62 and the outer casing 1, which can drive the airflow through the heat sink 62 more efficiently and make full use of the internal space of the outer casing 1 to further improve the wind power.

[0087] In some embodiments, the radial distance D3 between the tube 60 and the housing 1 is greater than the radial distance D4 between the root 302 of the blade 30 of the impeller 3 and the housing 1. The root 302 of the blade 30 refers to the portion of the blade 30 closest to the axis 210 of the rotating shaft 21. Thus, the projection of the impeller 3 along the axis 210 is completely located between the tube 60 and the housing 1. The blade 30 is smaller, which helps to reduce manufacturing costs and improve the structural strength of the blade 30. At the same time, the reduction in the size of the blade 30 can reduce the power of the motor (drive device 2), thereby allowing the motor to be smaller and generating less heat, so that heat dissipation only at the front end can meet the heat dissipation requirements.

[0088] In some embodiments, such as Figure 25 As shown, the polishing machine also includes a retaining ring 7 disposed on the inner wall of the housing 1. A heat sink 62 is located within the retaining ring 7. Optionally, the heat sink 62 contacts the inner wall of the retaining ring 7, which can increase the structural strength of the front end of the polishing machine. Optionally, the blades 30 of the impeller 3 are at least partially located within the retaining ring 7. This allows for a reduction in the size of the impeller 3 and its blades 30 without reducing the size of the working head 4, thereby enabling a smaller motor and reducing heat generation. (Continue to refer to...) Figure 25 Optionally, the radial distance D3 between the tube 60 and the housing 1 is smaller than the radial distance D4 between the root 302 of the blade 30 of the impeller 3 and the housing 1, so that the size of the blade 30 is not too small. Further optionally, the retaining ring 7 and the front end face 202 of the housing 20 are spaced apart along the axis of the drive device 2 to better connect the annular cavity 14 and the heat sink 62.

[0089] In some embodiments, the working head 4 and the rotating shaft 21 of the drive device 2 are coaxially arranged, and their axes coincide. In other embodiments, the working head 4 is eccentrically arranged relative to the rotating shaft 21 of the drive device 2, and the axis 42 of the working head 4 is parallel to the axis 210 of the drive device 2, for example... Figure 2 , Figure 6 , Figure 10 , Figure 16 , Figure 19 and Figure 25 The embodiments shown are illustrated. The working head 4 is eccentrically positioned relative to the rotating shaft 21 of the drive device 2, which can increase the outer end area of ​​the working head 4 when the rotating shaft 21 rotates.

[0090] The polishing machine includes a transmission mechanism 5 connecting the drive unit 2 and the working head 4, through which the power of the rotating shaft 21 is transmitted to the working head 4. Figure 26 As shown, the transmission mechanism 5 includes a connecting assembly 50 connected to the rotating shaft 21 of the drive device 2 and a connecting piece 52 connected to the connecting assembly 50. The working head 4 is connected to the connecting piece 52, and the connecting piece 52 and the working head 4 are arranged coaxially.

[0091] In some embodiments, the axis 42 of the working head 4 is parallel to the axis 210 of the rotating shaft 21, and the connector 52 is rotatably connected to the connecting assembly 50. The working head 4 can not only rotate around the axis 210 of the rotating shaft 21, but also rotate around its own axis 42. During the polishing process, when the working head 4 encounters resistance, it can rotate around its own axis 42 to avoid jamming or excessive resistance, thereby reducing the risk of damage to the working head 4 and the drive device 2.

[0092] In some embodiments, the connecting assembly 50 includes a connecting seat 502 connected to the rotating shaft 21 of the driving device 2 and a bearing 503 disposed within the connecting seat 502. Figure 26 In the illustrated embodiment, the connecting seat 502 includes a base plate 5020 and an outer ring 5021 extending from the outer edge of the base plate 5020 toward the side where the working head 4 is located. A bearing 503 is disposed within the outer ring 5021. A connecting member 52 is connected to the bearing 503, specifically, it is connected to the inner hole of the bearing 503. The impeller 3 is connected to the connecting seat 502, and when the rotating shaft 21 rotates, it drives the connecting seat 502 and the impeller 3 to rotate synchronously.

[0093] In some embodiments, reference Figure 2 and Figure 10 The connector 52 is slidably engaged with the connecting assembly 50, and can move in a direction closer to or farther from the drive device 2 (i.e., along the axis 42 of the working head 4). Figure 27As shown, the transmission mechanism 5 also includes an elastic element 53 that elastically abuts against the connecting assembly 50 and the connecting member 52. The elastic element 53 can be, for example, a spring. The elastic element 53 applies a spring force to the connecting member 52 towards the side where the working head 4 is located. When the working head 4 contacts the workpiece, the elastic element 53 is compressed, and the spring force of the elastic element 53 keeps the working head 4 in contact with the workpiece. Since the connecting member 52 can axially float within a certain range, effectively compensating for axial movement, it can better ensure a good fit between the working head 4 and the workpiece. Simultaneously, the spring force of the elastic element 53 keeps the contact force between the working head 4 and the workpiece surface within a suitable range, absorbing abnormally increased working pressure during polishing, ensuring polishing effect, and preventing damage to the workpiece surface. When the contact force between the working head 4 and the workpiece surface is too large, the working head 4 can compress the elastic element 53 and automatically retract, preventing hard compression. This protects both the working head 4 and the motor, preventing the motor from overheating or burning out due to the working head 4 jamming or excessive resistance.

[0094] The sliding engagement between connector 4 and connecting assembly 50 can be achieved in various ways. Several feasible structures are illustrated below.

[0095] In some embodiments, such as Figure 27 As shown, the connecting assembly 50 includes an inner liner 500 disposed in the connecting seat 502 and a limiting member 501 fixedly connected to the inner liner 500. The bearing 503 is connected between the connecting seat 502 and the inner liner 500 so that the inner liner 500 can rotate smoothly relative to the connecting seat 502. The inner liner 500 includes a plate 5000 and a protruding ring 5001 protruding from the outer edge of the plate 5000 toward the side where the working head 4 is located. The limiting member 501 is at least partially located inside the protruding ring 5001. Specifically, the limiting member 501 is connected to the plate 5000 and extends into the protruding ring 5001. The connecting member 52 can be slidably engaged with the limiting member 501 and can slide along the limiting member 501. Specifically, the connecting member 52 includes a tube 523 and an end plate 520 provided at one end of the tube 523. The end plate 520 is provided with a guide hole 5200. The limiting member 501 passes through the guide hole 5200 and is adapted to the size of the guide hole 5200 so that the connecting member 52 can slide along the limiting member 501. The connector 52 can also be slidably engaged with the convex ring 5001. Specifically, the tube body 523 of the connector 52 can be configured to fit the inner hole of the convex ring 5001, allowing the connector 52 to slide along the convex ring 5001. To prevent the connector 52 from disengaging from the limiting member 501, the limiting member 501 has a limiting portion 5010 with a radial dimension larger than the guide hole 5200 at one end inside the tube body 523. When the end plate 520 moves outward, it can be limited by the limiting portion 5010, thereby preventing the connector 52 from disengaging from the limiting member 501. The limiting member 501 can be, for example, a bolt.

[0096] The elastic member 53 elastically abuts between the connector 52 and the plate 5000, providing a spring force to prevent the connector 52 from moving toward the plate 5000. Optionally, the connector 52 is provided with an outwardly protruding stepped portion 521, and the elastic member 53 is sleeved on the outside of the connector 52 (the tube body 523), with its two ends abutting against the stepped portion 521 and the plate 5000, respectively.

[0097] In other embodiments, such as Figure 28 As shown, the connecting component 50 includes components disposed on the connecting base 502 ( Figure 28 Not shown in the image, please refer to the following: Figure 27 The inner liner 500 and pressure ring 504 are located within the working head 4. The inner liner 500 includes a plate 5000 and a protruding ring 5001 extending from the outer edge of the plate 5000 towards the working head 4. The pressure ring 504 is connected to the protruding ring 5001, and the pressure ring 504 and the plate 5000 are located at opposite ends of the protruding ring 5001. A bearing 503 connects the connecting seat 502 and the inner liner 500, allowing the inner liner 500 to rotate smoothly relative to the connecting seat 502. The pressure ring 504 is located within the bearing 503 and can rotate with the inner liner 500. A connecting member 52 is slidably engaged with the pressure ring 504. Specifically, the connecting member 52 passes through the pressure ring 504, and the central hole 5040 of the pressure ring 504 is adapted to the connecting member 52, allowing the connecting member 52 to move relative to the pressure ring 504.

[0098] The connector 52 is provided with a protruding limiting ring 522. The projection of the limiting ring 522 along the axial direction of the connector 52 is at least partially located on the pressure ring 504, so as to achieve limiting through the contact between the limiting ring 522 and the pressure ring 504, and prevent the connector 52 from detaching from the pressure ring 504. An elastic member 53 elastically abuts between the limiting ring 522 and the plate 5000. Optionally, the elastic member 53 is sleeved on the connector 52.

[0099] In some embodiments, such as Figure 6 , Figure 10 , Figure 16 , Figure 19 , Figure 25 and Figure 26 As shown, the connecting seat 502 and the rotating shaft 21 are separate components, but they can be connected by bolts or other means. In other embodiments, such as... Figure 2 and Figure 27 As shown, the connecting seat 502 and the rotating shaft 21 are integrally formed.

[0100] The impeller 3 is connected to the connecting assembly 50. In some embodiments, the impeller 3 and the connecting assembly 50 are snap-fitted together, such as... Figure 26 , Figure 27 and Figure 29As shown, the impeller 3 includes a limiting plate 33 that contacts the top of the connecting seat 502 and a hook 34 that hooks into the connecting assembly 50, the hook 34 extending toward the side where the drive device 2 is located.

[0101] like Figure 26 and Figure 27 As shown, the axis 42 of the working head 4 is located on the first side of the axis 210 of the rotating shaft 21 of the drive device 2. In some embodiments, the mass of the connecting seat 502 on the first side is less than its mass on the second side. The first side and the second side are respectively located on both sides of the axis 210 of the drive device 2. In this way, the center of mass of the working head 4, connecting assembly 50 and other components connected to the rotating shaft 21 is closer to the axis 210 of the rotating shaft 21, which helps to improve the smoothness of the rotation of the components driven by the rotating shaft 21 when the rotating shaft 21 rotates. Optionally, the center of mass of the components driven by the rotating shaft 21 is located on the axis 210 of the rotating shaft 21 to further ensure the smoothness of the polishing machine's operation and reduce centrifugal force.

[0102] The position of the overall center of gravity of the component driven by the rotating shaft 21 can be adjusted in a variety of ways, and several adjustment methods are described below.

[0103] In some embodiments, the wall thickness B1 of the outer ring 5021 on the first side is less than the wall thickness B2 on the second side. Thus, the mass of the outer ring 5021 on the first side is less than the mass of the outer ring 5021 on the second side. Since the working head 4 is connected to the first side, the overall center of mass of the component driven by the rotating shaft 21 can be made to be closer to the axis 210 of the rotating shaft 21.

[0104] In some embodiments, such as Figure 26 and Figure 27 As shown, the outer ring body 5021 has a first protrusion 5022 located on the second side and a second protrusion 5023 located on the first side, and the mass of the first protrusion 5022 is greater than the mass of the second protrusion 5023. Figure 26 In the illustrated embodiment, the first protrusion 5022 and the second protrusion 5023 protrude radially (or laterally) from both sides of the outer ring body 5021, respectively. The thickness of the second protrusion 5023 is less than the thickness of the first protrusion 5022, so that its mass is smaller. Of course, the mass can also be changed by adjusting the distance of the protrusion. Since the mass of the first protrusion 5022 is greater than the mass of the second protrusion 5023, the mass of the second side of the outer ring body 5021 is greater, which is beneficial to make the overall center of mass of the component driven by the rotating shaft 21 closer to the axis 210 of the rotating shaft 21.

[0105] Optionally, the first protrusion 5022 is located on the top of the impeller 3, and the hook 34 of the impeller 3 is hooked to the first protrusion 5022, which can shorten the length of the hook 34.

[0106] It is understood that in other embodiments, the outer ring body 5021 may only have a first protrusion 5022 on the second side, without having a second protrusion 5023. Since the second side has a first protrusion 5022, the mass of the outer ring body 5021 on the second side increases, thereby making the overall center of mass of the component driven by the rotating shaft 21 closer to the axis 210 of the rotating shaft 21.

[0107] In some embodiments, the rotating shaft 21 extends from both ends of the housing 20, and a working head 4, an impeller 3, a transmission mechanism 5 and a corresponding housing structure are provided at both ends of the polishing machine. The description of the relevant structures can be found above. Figure 30 and Figure 31 In the illustrated embodiment, the outer casing 1 is located at both ends of the polishing machine, and the rotating shaft 21 extends from the front end cover 230 and the rear end cover 231 of the drive device 2. Both ends of the polishing machine are equipped with a working head 4, an impeller 3, and a transmission mechanism 5. Since the working heads 4 at both ends of the polishing machine can be driven to rotate, polishing operations can be performed at both ends of the polishing machine, which is beneficial for improving polishing efficiency. It is understood that when both ends of the polishing machine have working heads 4, either end can be chosen as the front end.

[0108] Optionally, when both ends of the polishing machine are equipped with working heads 4, the two ends of the polishing machine are symmetrical.

[0109] It should be noted that, in the absence of conflict, the various embodiments described herein can be combined with each other to obtain more implementation schemes.

[0110] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A polishing machine, characterized in that, include: The outer casing (1) has an opening (10); The drive unit (2) is connected to the outer casing (1); An impeller (3), disposed within the housing (1), is driven to rotate by the drive device (2), and the airflow generated by the rotation of the impeller (3) is discharged at least partially through the opening (10); and, The working head (4) is located at the opening (10) and is driven to rotate by the driving device (2). The working head (4) includes an outer end face (40) and an outer peripheral surface (41) connected to the outer end face (40). An air outlet gap (100) is formed between the working head (4) and the opening end (11) of the outer shell (1) for airflow to pass through. The airflow passing through the air outlet gap (100) passes at least partially through the outer peripheral surface (41).

2. The polishing machine as described in claim 1, characterized in that, The outer contour of the projection of the opening (10) along the axial direction of the drive device (2) is at least partially located on the outer peripheral surface (41) of the working head (4) or at least partially located outside the outer peripheral surface (41) of the working head (4).

3. The polishing machine as described in claim 1, characterized in that, The cross-sectional area of ​​the outer peripheral surface (41) of the working head (4) gradually decreases from the outer end surface (40) toward the side where the driving device (2) is located.

4. The polishing machine as described in claim 1, characterized in that, The outer contour of the longitudinal section of the outer peripheral surface (41) of the working head (4) is the first outer contour. The first outer contour includes oblique and / or curved parts, and the first outer contour gradually approaches the axis of the driving device (2) from the outer end face (40) toward the side where the driving device (2) is located.

5. The polishing machine as described in claim 1, characterized in that, The inner surface of the opening end (11) of the outer casing (1) is tapered and gradually expands outward; or, the inner surface of the opening end (11) of the outer casing (1) is a straight tube parallel to the axis of the driving device (2).

6. The polishing machine as described in claim 1, characterized in that, The outer contour of the longitudinal section of the outer peripheral surface (41) of the working head (4) is the first outer contour, and the inner contour of the longitudinal section of the opening end (11) of the outer shell (1) is the first inner contour. Both the first outer contour and the first inner contour are oblique lines, and the distances between the first outer contour and the first inner contour and the axis (210) of the driving device (2) gradually increase outwards. The angle between the first outer contour and the axis of the driving device (2) is a first angle α1, and the angle between the first inner contour and the axis of the driving device (2) is a second angle α2. The first angle α1 is smaller than the second angle α2; or, The distance between the first outer contour and the axis (210) of the driving device (2) gradually increases outward, and the first inner contour is parallel to the axis (210) of the driving device (2).

7. The polishing machine as described in claim 1, characterized in that, The drive device (2) is a motor. The housing (1) surrounds the outside of the housing (20) of the drive device (2). The housing (1) is provided with a rear air inlet (120) corresponding to the tail position of the drive device (2). The rear air inlet (120) is disposed opposite to the outer surface of the housing (20) of the drive device (2) or opposite to the rear end face (2310) of the drive device (2). A gas flow channel (13) is formed between the housing (1) and the housing (20) of the drive device (2) and communicates with the opening (10) and the rear air inlet (120).

8. The polishing machine as described in claim 7, characterized in that, The housing (20) is made of metal and has protruding heat dissipation teeth (201).

9. The polishing machine as described in claim 7, characterized in that, The outer casing (1) is provided with an air outlet (122) that connects its inner and outer sides, and the position of the air outlet (122) corresponds to the blade (30) of the impeller (3).

10. The polishing machine as described in claim 9, characterized in that, The impeller (3) includes a base plate (31), blades (30) extending from the base plate (31) toward the side where the drive device (2) is located, and a guide section (32) extending from the outer edge of the base plate (31) toward the side away from the drive device (2). The guide section (32) extends toward the side where the outer shell (1) is located, and its longitudinal section is an arc shape that is concave toward the side where the working head (4) is located. The outer casing (1) includes a straight tube-shaped annular portion (160), a conical annular portion (161) spaced apart from the annular portion (160) along the axial direction of the drive device (2), and a plurality of spaced connecting pieces (162) connecting the annular portion (160) and the conical annular portion (161), with the air outlet (122) formed between two adjacent connecting pieces (162). The cross-sectional area of ​​the conical ring portion (161) gradually increases toward the side where the working head (4) is located. The blade (30) includes a first inclined portion (300) corresponding to the conical ring portion (161) and a second inclined portion (301) at least partially corresponding to the air outlet (122). The air guide portion (32) is at least partially corresponding to the ring portion (160).

11. The polishing machine as described in claim 10, characterized in that, The portion of the blade (30) away from the axis of the drive device (2) is deflected relative to the portion of the blade (30) close to the axis of the drive device (2); the portion of the connecting piece (162) away from the axis of the drive device (2) is deflected relative to the portion of the connecting piece (162) close to the axis of the drive device (2), and the deflection directions of the blade (30) and the connecting piece (162) are opposite.

12. The polishing machine as described in claim 1, characterized in that, The drive device (2) is a motor. The housing (1) is connected to the front end of the drive device (2). The housing (1) is provided with an inlet air hole (121) that connects its inner and outer sides. The inlet air hole (121) and the opening (10) are located on both sides of the impeller (3).

13. The polishing machine according to any one of claims 1 to 12, characterized in that, The polishing machine includes a transmission mechanism (5) connected between the drive device (2) and the working head (4). The transmission mechanism (5) includes a connecting seat (502) connected to the rotating shaft (21) of the drive device (2), a bearing (503) disposed in the connecting seat (502), and a connecting piece (52) connected to the bearing (503). The connecting piece (52) is connected to the working head (4), and the connecting seat (502) is connected to the impeller (3). The axis of the working head (4) is parallel to the axis of the drive device (2).

14. The polishing machine according to any one of claims 1 to 12, characterized in that, The axial wind force generated by the impeller (3) is greater than the radial wind force; In the axial direction of the drive device (2), the inner wall of the housing (1) at least the portion outside the blades (30) of the impeller (3) does not have an inwardly protruding portion.

15. The polishing machine according to any one of claims 1 to 12, characterized in that, In the axial direction of the drive device (2), the inner wall of the housing (1) at least the portion outside the blades (30) of the impeller (3) does not retract toward the axis of the drive device (2).

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