Grinding machine

Abstract

The utility model provides a grinding machine which comprises a shell and a supporting arm connected to the shell, the supporting arm can rotate relative to the shell, the supporting arm comprises a first limiting part and a second limiting part, the shell comprises a matching structure, the matching structure is located between the first limiting part and the second limiting part, and in the process that the supporting arm rotates relative to the shell, the supporting arm rotates relative to the shell. The matching structure and the first limiting part are matched at the first limiting position to limit anticlockwise rotation of the supporting arm, and the matching structure and the second limiting part are matched at the second limiting position to limit clockwise rotation of the supporting arm.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric tools, in particular to a grinder. BACKGROUND

[0002] At present, the traditional grinder includes an arm and a grinding disc. Some wall surface grinders do not have an arm rotation limiting structure, which is easy to cause misoperation, thereby reducing the grinding efficiency, grinding comfort and dust collection rate, and even breaking the connection part of the machine or causing the machine to be scrapped. Although the arm rotation limiting structure is provided in another part of the wall surface grinder, the force arm of the arm rotation limiting structure is long, and the torque is large when limiting. In order to reliably limit, the arm rotation limiting structure has to be external and large, so that the machine appears very bulky and affects the appearance.

[0003] Therefore, it is necessary to provide a new grinder. CONTENT OF THE INVENTION

[0004] The present application provides a grinder which is beautiful in appearance, high in reliability, low in cost and simple in assembly.

[0005] Specifically, the present application provides a grinder, which includes a shell and an arm connected to the shell, the arm is rotatable relative to the shell, the arm includes a first limiting part and a second limiting part, the shell includes a matching structure, the matching structure is located between the first limiting part and the second limiting part, during the rotation of the arm relative to the shell, the matching structure and the first limiting part cooperate at a first limit position to limit the counterclockwise rotation of the arm, and the matching structure and the second limiting part cooperate at a second limit position to limit the clockwise rotation of the arm.

[0006] Further, the arm includes an annular groove and the first limiting part and the second limiting part arranged in the annular groove, the shell includes an annular structure, the annular structure includes a ring body and the matching structure protruding radially from the ring body, and the annular structure is installed in the annular groove.

[0007] Further, the grinder further includes a connecting piece, the connecting piece rotatably connects the arm to the shell, and the arm rotates around the connecting piece.

[0008] Further, the matching structure comprises a first matching part and a second matching part, the first matching part and the second matching part are radially protruded from the ring body, and the first matching part and the second matching part are adjacently arranged; during the rotation of the supporting arm relative to the shell, the first matching part matches with the first limiting part at the first limit position to limit the counterclockwise rotation of the supporting arm, and the second matching part matches with the second limiting part at the second limit position to limit the clockwise rotation of the supporting arm.

[0009] Further, the first limiting part and the second limiting part are radially protruded into the groove from the groove wall of the annular groove.

[0010] Further, the matching structure is radially protruded outward from the ring body.

[0011] Further, the first matching part and the second matching part are radially protruded outward from the ring body.

[0012] Further, the polishing machine comprises two supporting arms, the two supporting arms are symmetrically connected to two sides of the shell, the supporting arm comprises a first end part and a second end part, the first limiting part and the second limiting part are arranged on the first end part, and the second end part of one supporting arm and the second end part of another supporting arm are assembled together to form a cylindrical structure.

[0013] Further, the polishing machine further comprises a main pipe, one end of the main pipe is located in the cylindrical structure, the main pipe extends in a first direction, and the connecting piece extends in a second direction, wherein the second direction is perpendicular to the first direction.

[0014] Further, the maximum angle α of the rotation of the supporting arm relative to the shell is greater than 180°.

[0015] In the present application, the supporting arm is rotatable relative to the shell, the supporting arm comprises a first limiting part and a second limiting part, the shell comprises a matching structure, the matching structure is located between the first limiting part and the second limiting part, during the rotation of the supporting arm relative to the shell, the matching structure matches with the first limiting part at the first limit position to limit the counterclockwise rotation of the supporting arm, and the matching structure matches with the second limiting part at the second limit position to limit the clockwise rotation of the supporting arm, without additional limiting structure, the matching structure, the first limiting part and the second limiting part are close to the rotation center of the supporting arm, the force arm is short, and the torque borne during the limiting is small, therefore, the above-mentioned limiting mode is more reliable, the cost is lower, the assembly is simpler, the structure is more compact, and the appearance is more beautiful. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the polishing machine of the present application.

[0017] Figure 2 is Figure 1 is a perspective exploded view of the sander shown.

[0018] Figure 3 is Figure 2 is an enlarged view of the circle portion shown.

[0019] Figure 4 is Figure 2 is a further perspective exploded view of the sander shown.

[0020] Figure 5 is Figure 4 is an enlarged view of the circle portion shown.

[0021] Figure 6 is Figure 4 is a further perspective exploded view of the sander shown.

[0022] Figure 7 is Figure 6 is an enlarged view of the circle portion shown.

[0023] Figure 8 is Figure 1 is a cross-sectional view of the sander shown.

[0024] Figure 9 is Figure 8 is an enlarged view of the circle portion shown.

[0025] Figure 10 is Figure 1 is a cross-sectional view of the sander shown.

[0026] Figure 11 is Figure 10 is an enlarged view of the circle portion shown. DETAILED DESCRIPTION

[0027] The exemplary embodiments will be described in detail herein with reference to the attached drawings, wherein like reference numerals refer to like elements throughout. The following detailed description is not intended to be understood in a restrictive sense, and is presented as an example of the exemplary embodiments consistent with the present disclosure.

[0028] The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. Unless otherwise defined, all terms of art used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field of the application. It will be further understood that the use of "first", "second", and / or other similar

[0029] Please combine Figures 1 to 11 The present application provides a sander 100, which comprises a housing 10 and two supporting arms 20 connected to the housing 10, the two supporting arms 20 are symmetrically connected to two sides of the housing 10, the supporting arms 20 are rotatable relative to the housing 10, and the maximum angle a of the rotatable supporting arms 20 relative to the housing 10 is greater than 180°. The sander 100 further comprises a connecting member 30, the connecting member 30 rotatably connects the supporting arms 20 to the housing 10, and the supporting arms 20 rotate around the connecting member 30. The sander 100 further comprises a polishing disc and a driving assembly, the driving assembly is installed in the housing 10, and the polishing disc is driven by the driving assembly.

[0030] The support arm 20 comprises an annular groove 23 and a first limiting portion 21 and a second limiting portion 22 arranged in the annular groove 23. The shell 10 comprises an annular structure 11 comprising a ring body 12 and a fitting structure 13 protruding radially from the ring body 12, the annular structure 11 is arranged in the annular groove 23, the fitting structure 13 is located between the first limiting portion 21 and the second limiting portion 22, during the rotation of the support arm 20 relative to the shell 10, the fitting structure 13 cooperates with the first limiting portion 21 at the first limit position to limit the counterclockwise rotation of the support arm 20, and the fitting structure 13 cooperates with the second limiting portion 22 at the second limit position to limit the clockwise rotation of the support arm 20. Specifically, the fitting structure 13 comprises a first fitting portion 131 and a second fitting portion 132, both of which protrude radially from the ring body 12, and the first fitting portion 131 and the second fitting portion 132 are arranged adjacent to each other; during the rotation of the support arm 20 relative to the shell 10, the first fitting portion 131 cooperates with the first limiting portion 21 at the first limit position to limit the counterclockwise rotation of the support arm 20, and the second fitting portion 132 cooperates with the second limiting portion 22 at the second limit position to limit the clockwise rotation of the support arm 20.

[0031] The fitting structure 13 protrudes radially outward from the ring body 12. Specifically, the first fitting portion 131 and the second fitting portion 132 both protrude radially outward from the ring body 12. The first limiting portion 21 and the second limiting portion 22 both protrude radially inward from the groove wall of the annular groove 23.

[0032] The support arm 20 comprises a first end portion 25 and a second end portion 26, the annular groove 23 and the first limiting portion 21 and the second limiting portion 22 in the annular groove 23 are arranged at the first end portion 25, the second end portion 26 of one support arm 20 and the second end portion 26 of another support arm 20 are assembled together to form a cylindrical structure 24. The grinding machine 100 further comprises a main pipe 40, the main pipe 40 comprises a third end portion and a fourth end portion, the third end portion is located in the cylindrical structure 24. The main pipe 40 extends along a first direction X, and the connecting piece 30 extends along a second direction Y, wherein the second direction Y is perpendicular to the first direction X.

[0033] In the application, the support arm 20 is rotatable relative to the shell 10, the support arm 20 comprises an annular groove 23, a first limiting part 21 and a second limiting part 22 arranged in the annular groove 23, the shell 10 comprises an annular structure 11, the annular structure 11 comprises a ring body 12 and a matching structure 13 protruding radially from the ring body 12, the annular structure 11 is installed in the annular groove 23, the matching structure 13 is located between the first limiting part 21 and the second limiting part 22, during the rotation of the support arm 20 relative to the shell 10, the matching structure 13 cooperates with the first limiting part 21 at the first limit position to limit the counterclockwise rotation of the support arm 20, the matching structure 13 cooperates with the second limiting part 22 at the second limit position to limit the clockwise rotation of the support arm 20, without additional limiting structure, the matching structure 13, the first limiting part 21 and the second limiting part 22 are close to the rotation center of the support arm 20, the force arm is short, the torque borne during limiting is small, therefore, the above-mentioned limiting mode is more reliable, the cost is lower, the assembly is simpler, the structure is more compact, and the appearance is more beautiful.

[0034] The above is only the preferred embodiment of the application, and does not limit the application in any form. Although the application has been disclosed as above, it is not intended to limit the application. Any skilled person in the art can make some changes or modifications to the above-mentioned disclosed technical content without departing from the scope of the technical solution of the application, and any simple modification, equivalent change and modification of the above-mentioned embodiment according to the technical essence of the application still belongs to the scope of the technical solution of the application.

Claims

1. A sander comprising a housing and an arm connected to the housing, the arm being rotatable relative to the housing, characterized in that, The supporting arm comprises a first limiting part and a second limiting part, the shell comprises a matching structure, the matching structure is located between the first limiting part and the second limiting part, during the rotation of the supporting arm relative to the shell, the matching structure matches with the first limiting part at a first limit position to limit the counterclockwise rotation of the supporting arm, and the matching structure matches with the second limiting part at a second limit position to limit the clockwise rotation of the supporting arm.

2. The sander of claim 1, wherein, The supporting arm comprises a ring-shaped groove and the first limiting part and the second limiting part arranged in the ring-shaped groove, the shell comprises a ring-shaped structure, the ring-shaped structure comprises a ring body and the matching structure protruding radially from the ring body, and the ring-shaped structure is installed in the ring-shaped groove.

3. The sander of claim 1, wherein, The polishing machine further comprises a connecting piece, the connecting piece rotatably connects the supporting arm to the shell, and the supporting arm rotates around the connecting piece.

4. The sander of claim 2, wherein, The matching structure comprises a first matching part and a second matching part, the first matching part and the second matching part both protrude radially from the ring body, and the first matching part and the second matching part are arranged adjacent to each other; during the rotation of the supporting arm relative to the shell, the first matching part matches with the first limiting part at the first limit position to limit the counterclockwise rotation of the supporting arm, and the second matching part matches with the second limiting part at the second limit position to limit the clockwise rotation of the supporting arm.

5. The sander of claim 2, wherein, The first limiting part and the second limiting part both protrude radially into the groove from the groove wall of the ring-shaped groove.

6. The sander of claim 2, wherein, The matching structure protrudes radially outward from the ring body.

7. The sander of claim 4, wherein, The first matching part and the second matching part both protrude radially outward from the ring body.

8. The sander of claim 3, wherein, The polishing machine comprises two supporting arms, the two supporting arms are symmetrically connected to two sides of the shell, the supporting arm comprises a first end part and a second end part, the first limiting part and the second limiting part are arranged at the first end part, and the second end part of one supporting arm and the second end part of another supporting arm are assembled together to form a cylindrical structure.

9. The sander of claim 8, wherein, The polishing machine further comprises a main pipe, one end of the main pipe is located in the cylindrical structure, the main pipe extends in a first direction, the connecting piece extends in a second direction, and the second direction is perpendicular to the first direction.

10. The sander of claim 1, wherein, The maximum rotation angle of the supporting arm relative to the shell is greater than 180 degrees.

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