Grinding machine

Abstract

The utility model provides a grinding machine which comprises a machine shell, a motor, a transmission mechanism and an output shaft, the motor, the transmission mechanism and the output shaft are arranged in the machine shell, the transmission mechanism comprises a gear box and a gear set arranged in the gear box, the motor transmits power to the output shaft through the gear set, and the output shaft comprises a shaft part and a sealing ring integrally formed with the shaft part. The sealing ring is formed by extending outwards from the shaft part in the radial direction, the shaft part is configured to be provided with a grinding head, the grinding machine further comprises a flexible sealing ring, and the sealing ring and the sealing ring jointly cover a gap between the shaft part and the gear box. According to the grinding machine, through the combined action of the sealing ring of the output shaft and the flexible sealing ring, a good sealing structure is formed, and the situation that dust enters the shell to cause failure of components such as a motor is effectively prevented.

Description

Technical Field

[0001] The invention relates to the field of wall grinding, in particular to a grinding machine. Background Art

[0002] Traditional wall sanding is primarily done manually with a hand brush, resulting in low efficiency. The advent of electric sanders has greatly improved work efficiency. However, with this increased efficiency comes a significant increase in dust generated per unit time. This dust not only spreads into the air but also has a chance of entering the machine, potentially causing failure of components like the motor and gears, shortening the sander's service life. Utility Model Content

[0003] The purpose of this application is to overcome the deficiencies in the prior art and provide a grinding machine with good sealing performance.

[0004] The present application provides a grinder, comprising a housing, a motor arranged in the housing, a transmission mechanism and an output shaft, the transmission mechanism comprising a gearbox and a gear set arranged in the gearbox, the motor transmitting power to the output shaft through the gear set, the output shaft comprising a shaft portion and a sealing ring integrally formed with the shaft portion, the sealing ring extending radially outward from the shaft portion, the shaft portion being configured to mount a grinding head, the grinder further comprising a flexible sealing ring, the sealing ring and the sealing ring jointly covering a gap between the shaft portion and the gearbox.

[0005] Furthermore, the sealing ring, the sealing ring and the gear box together form a labyrinth sealing structure.

[0006] Furthermore, the sealing ring includes an outer wall, an inner wall and a bottom wall connecting the inner wall and the outer wall, and the gear box includes an end away from the motor, and the end and the sealing ring are at least partially located between the outer wall and the inner wall.

[0007] Furthermore, in the direction in which the bottom wall points to the gear set, the outer wall protrudes more than the sealing ring, and the inner wall protrudes more than the outer wall.

[0008] Furthermore, the sealing ring is located between the end portion and the inner wall.

[0009] Furthermore, the grinder includes a first bearing and a second bearing located in the gear box, the first bearing and the second bearing jointly support the shaft portion of the output shaft, and the second bearing is located between the first bearing and the sealing ring.

[0010] Furthermore, the ratio of the distance from the sealing ring to the second bearing to the distance from the first bearing to the second bearing is less than 1 / 2.

[0011] Furthermore, the sealing ring includes an inner ring, an outer ring and a connecting portion connecting the inner ring and the outer ring, and the inner ring and the outer ring are arranged at intervals.

[0012] On the other hand, the present application also provides a grinder, which includes a casing, a motor arranged in the casing, a transmission mechanism and an output shaft, the transmission mechanism includes a gear box and a gear set arranged in the gear box, and the motor transmits power to the output shaft through the gear set; the output shaft includes a shaft portion and a sealing ring integrally formed with the shaft portion, the sealing ring extends outward from the shaft portion, the sealing ring forms an accommodating space, the shaft portion is configured to install a grinding head, the grinder also includes a flexible sealing ring, the gear box portion is located in the accommodating space, and the sealing ring is located in the accommodating space.

[0013] The grinder of the present application forms a good sealing structure through the combined action of the sealing ring of the output shaft and the flexible sealing ring, which effectively prevents dust from entering the housing and causing failure of components such as the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional schematic diagram of a grinder according to an embodiment of the present application.

[0015] Figure 2 for Figure 1 A schematic diagram of a grinding machine is shown, with one housing half not shown.

[0016] Figure 3 for Figure 1 A partial cutaway view of the grinding machine is shown.

[0017] Figure 4 for Figure 3 A partial enlarged view of . DETAILED DESCRIPTION

[0018] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different drawings represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with this application.

[0019] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. Unless otherwise defined, technical or scientific terms used in this application should have the same ordinary meaning as those of ordinary skill in the art to which this invention belongs. The terms "first," "second," and similar terms used in this application do not denote any order, quantity, or importance, but are simply used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a limitation of quantity, but rather indicate the presence of at least one. "Multiple" or "several" means two or more. Unless otherwise indicated, terms such as "front," "rear," "lower," and / or "upper" are for convenience only and are not intended to limit a position or spatial orientation. Terms such as "include" or "comprising" mean that the elements or objects listed before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. As used in this specification and the appended claims, the singular forms "a," "an," "said," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0020] Please combine Figures 1 to 3 The present application provides a grinder that can be used for grinding surfaces such as walls, ceilings, and floors. It includes a shell 1, a motor 2, a transmission structure 3, and an output shaft 4. The motor 2 and the transmission structure 3 are arranged in the shell 1. The transmission mechanism 3 includes a gear box 31 and a gear set 32 ​​arranged in the gear box. The gear set 32 ​​transmits the power of the motor 2 to the output shaft 4.

[0021] The housing 1 is composed of two half shells 11 and a handle 12. The handle 12 is located at the rear end of the two half shells 11. The two half shells 11 are assembled with the handle 12 after being buckled together. Figure 3 and Figure 4 The output shaft 4 includes a shaft portion 41 and a sealing ring 42 integrally formed with the shaft portion. The sealing ring 42 extends radially outward from the shaft portion 41. The shaft portion 41 protrudes from the housing 1 and is configured to mount a grinding head.

[0022] The grinder also includes a flexible sealing ring 5, which, together with a sealing ring 42, covers the gap between the shaft 41 and the gearbox 31. Optionally, the sealing ring 42 includes an outer wall 421, an inner wall 422, and a bottom wall 423 connecting the inner and outer walls. The gearbox 32 includes an end 321 distal from the motor. The end 321 and the sealing ring 5 are at least partially located between the outer wall 421 and the inner wall 422, thereby forming a labyrinthine structure that minimizes dust from entering the housing and damaging components such as the motor and gears. Dust generated during grinding can be introduced into a dust collection device via a pipe 13.

[0023] Preferably, in the direction in which the bottom wall 423 points to the gear set 22, the outer wall 421 protrudes more than the sealing ring 423, and the inner wall 422 protrudes more than the outer wall 421, so that the maze structure turns multiple times. Even if there is dust in the gap, it will stop after hitting the sealing ring 42, the sealing ring 5 and the end 321, further reducing the inflow of dust.

[0024] The sealing ring 5 is located between the end 321 and the inner wall 422. The sealing ring 5 includes an inner ring 51, an outer ring 52, and a connecting portion 53 connecting the inner ring 51 and the outer ring 52. The inner ring and the outer ring are spaced apart to reserve deformation space so that the sealing ring can better fit the sealing ring 42 and the end 321. The inner ring 51 is adjacent to the inner wall 422, and the outer ring 52 is adjacent to the outer wall 421.

[0025] In addition, it can also be considered that the sealing ring 42 forms an accommodating space 40, which is surrounded by an inner wall 422, an outer wall 421 and a bottom wall 423. The gear box 31 is partially located in the accommodating space 40, and the sealing ring 5 is located in the accommodating space 40.

[0026] The grinding machine includes a first bearing 61 and a second bearing 62 located within the gearbox. The first and second bearings 61 and 62 jointly support the shaft portion 41 of the output shaft 4. The second bearing 62 is located between the first bearing 61 and the sealing ring 42. The ratio of the distance from the sealing ring 42 to the second bearing 62 to the distance from the first bearing 61 to the second bearing 62 is less than 1 / 2. In other words, the short distance from the second bearing 62 to the sealing ring 42 ensures that both bearings provide good support for the output shaft 4.

[0027] The grinder of the present application forms a good sealing structure through the combined action of the sealing ring of the output shaft and the flexible sealing ring, which effectively prevents dust from entering the housing and causing failure of components such as the motor.

[0028] It should be understood that the drawings illustrate exemplary embodiments in detail, and it should be understood that the present application is not limited to the details or methods set forth in the specification or illustrated in the drawings. It should also be understood that the terminology is for descriptive purposes only and should not be considered as limiting.

[0029] In view of this specification, further modifications and alternative embodiments of various aspects of the present invention will be obvious to those skilled in the art. Therefore, this description should be interpreted as being illustrative only. The configurations and arrangements shown in the various exemplary embodiments are illustrative only. Although only some embodiments are described in detail in this disclosure, many modifications (for example, variations in the size, dimensions, structure, shape and proportion of various elements, the value of parameters, the installation arrangement, the use of materials, colors, orientations, etc.) can be made without substantially departing from the novel teachings and advantages of the subject matter described herein. Some elements shown as being integrally formed can be constructed from multiple parts or elements, can be reversed or otherwise changed in the position of the elements, and the nature or number or position of discrete elements can be changed or varied. According to alternative embodiments, the order or sequence of any process, logical algorithm or method steps can be changed or reordered. Other replacements, modifications, changes and omissions can also be made to the design, operating conditions and arrangement of the various exemplary embodiments without departing from the scope of the present invention.

[0030] Although the present application recites particular combinations of features in the appended claims, various embodiments of the present invention relate to any combination of any of the features described herein, whether or not such combinations are currently claimed, and any such combination of features may be claimed in this application or in a future application. Any feature, element, or component of any exemplary embodiment discussed above may be used alone or in combination with any feature, element, or component of any other embodiment discussed above.

[0031] In various exemplary embodiments, relative dimensions, including angles, lengths, and radii, as shown in the accompanying drawings are drawn to scale. Actual measurements of the accompanying drawings would disclose the relative dimensions, angles, and ratios of the various exemplary embodiments. The various exemplary embodiments extend to various ranges encompassing absolute and relative dimensions, angles, and ratios that can be determined from the accompanying drawings. Various exemplary embodiments include any combination of one or more relative dimensions or angles that can be determined from the accompanying drawings. In addition, actual dimensions not expressly stated in this specification can be determined by combining the ratios of the dimensions measured in the accompanying drawings with the explicit dimensions stated in this specification.

Claims

1. A grinder comprising a housing, a motor disposed in the housing, a transmission mechanism, and an output shaft, wherein the transmission mechanism comprises a gearbox and a gear set disposed in the gearbox, and the motor transmits power to the output shaft via the gear set; characterized in that: The output shaft includes a shaft portion and a sealing ring integrally formed with the shaft portion, the sealing ring extending radially outward from the shaft portion, the shaft portion being configured to mount a grinding head, and the grinder further including a flexible sealing ring, the sealing ring and the sealing ring jointly covering the gap between the shaft portion and the gear box.

2. The grinding machine according to claim 1, characterized in that: The sealing ring, the sealing ring and the gear box together form a labyrinth sealing structure.

3. The grinding machine according to claim 2, characterized in that: The sealing ring includes an outer wall, an inner wall and a bottom wall connecting the inner wall and the outer wall. The gear box includes an end away from the motor. The end and the sealing ring are at least partially located between the outer wall and the inner wall.

4. The grinding machine according to claim 3, characterized in that: In the direction in which the bottom wall points to the gear set, the outer wall protrudes more than the sealing ring, and the inner wall protrudes more than the outer wall.

5. The grinding machine according to claim 3, characterized in that: The sealing ring is located between the end portion and the inner wall.

6. The grinding machine according to claim 1, characterized in that: The grinder includes a first bearing and a second bearing located in a gear box, wherein the first bearing and the second bearing jointly support the shaft portion of the output shaft, and the second bearing is located between the first bearing and the sealing ring.

7. The grinding machine according to claim 6, characterized in that: The ratio of the distance from the sealing ring to the second bearing to the distance from the first bearing to the second bearing is less than 1 / 2.

8. The grinding machine according to claim 1, characterized in that: The sealing ring comprises an inner ring, an outer ring and a connecting portion connecting the inner ring and the outer ring, and the inner ring and the outer ring are arranged at intervals.

9. A grinder comprising a housing, a motor disposed in the housing, a transmission mechanism, and an output shaft, wherein the transmission mechanism comprises a gearbox and a gear set disposed in the gearbox, and the motor transmits power to the output shaft via the gear set; characterized in that: The output shaft includes a shaft portion and a sealing ring integrally formed with the shaft portion, the sealing ring extending outward from the shaft portion, the sealing ring forming a receiving space, the grinder also includes a flexible sealing ring, the gear box portion is located in the receiving space, and the sealing ring is located in the receiving space.

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