CN115609432A

CN115609432A - Electric grinder

Info

Publication number: CN115609432A
Application number: CN202211323715.1A
Authority: CN
Inventors: 董明宏
Original assignee: Ningbo Hongtai Power Tools Industry Co ltd
Current assignee: Ningbo Hongtai Power Tools Industry Co ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-01-17

Abstract

The invention discloses an electric grinder which comprises a shell, a motor, a rotating shaft assembly and a grinding head, wherein the shell is provided with a first end and a second end; a bolt vertical to the rotating shaft assembly is movably arranged on the side wall of the shell in a penetrating mode, an inserting groove is formed in the side wall of the rotating shaft assembly, a spring is sleeved on the bolt located on the outer side of the shell, and a clamp spring is clamped on the bolt located on the inner side of the shell in a matched and clamped mode; the electric grinder also comprises a support sleeve and a rotating sleeve, wherein the support sleeve is sleeved outside the shell and is circumferentially limited on the shell, the rotating sleeve is rotatably sleeved outside the support sleeve, a protruding part is arranged on the inner wall of the rotating sleeve, an arc-shaped surface is arranged on the inner wall of the protruding part, the arc-shaped surface gradually shrinks inwards from one end to the other end, and the outer end part of the plug pin abuts against the arc-shaped surface; a reset structure is arranged between the rotating sleeve and the supporting sleeve; the invention can bring convenience to the pushing of the bolt, namely bring convenience to the locking of the rotating shaft assembly.

Description

Electric grinder

Technical Field

The invention relates to the technical field of hardware tools, in particular to an electric grinder.

Background

The electric grinder is a hardware tool for driving a grinding head to rotate so that the grinding head can grind a workpiece or a product, and the electric grinder on the market at present comprises a shell, a motor, a rotating shaft assembly and the grinding head, wherein the motor is fixed inside the shell, the rear end of the rotating shaft assembly is in transmission connection with an output shaft of the motor, and the front end of the rotating shaft assembly extends out of the shell and is in transmission connection with the grinding head; the side wall of the shell is movably provided with a bolt perpendicular to the rotating shaft component in a penetrating mode, the side wall of the rotating shaft component is provided with a slot for inserting the inner end part of the bolt, the bolt positioned on the outer side of the shell is sleeved with a spring, the bolt positioned on the inner side of the shell is in matched clamping with a clamp spring used for preventing the bolt from being separated from the shell, when the outer end part of the bolt is pushed to enable the inner end part of the bolt to be inserted into the slot, the bolt is used for locking the rotating shaft component to prevent the rotating shaft component from rotating relative to the shell, and when the outer end part of the bolt is released, the spring is used for driving the bolt to move outwards to reset so that the inner end part of the bolt is separated from the slot; in the electric grinding structure, when the grinding head needs to be replaced, firstly, the bolt is pushed by fingers so that the inner end part of the bolt is inserted into the slot and then the rotating shaft assembly is locked, after the rotating shaft assembly is locked, the locking sleeve at the front end of the rotating shaft assembly can be unscrewed to replace the grinding head, and after the grinding head is replaced, the locking sleeve at the front end of the rotating shaft assembly is screwed again and the bolt is released so that the bolt releases the locking of the rotating shaft assembly; however, in the above process, since the plug pin is directly pushed by a finger, but the outer diameter of the plug pin is smaller, in the process of pushing the plug pin, the plug pin is inconvenient to push, that is, the rotating shaft assembly is inconvenient to lock.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an electric grinder which can bring convenience to the pushing of a bolt, namely, can bring convenience to the locking of a rotating shaft assembly.

The electric grinder comprises a shell, a motor, a rotating shaft assembly and a grinding head, wherein the motor is fixed inside the shell, the rear end of the rotating shaft assembly is in transmission connection with an output shaft of the motor, and the front end of the rotating shaft assembly extends out of the shell and is in transmission connection with the grinding head; the side wall of the shell is movably provided with a bolt perpendicular to the rotating shaft component in a penetrating mode, the side wall of the rotating shaft component is provided with a slot for inserting the inner end part of the bolt, the bolt positioned on the outer side of the shell is sleeved with a spring, the bolt positioned on the inner side of the shell is in matched clamping with a clamp spring used for preventing the bolt from being separated from the shell, when the outer end part of the bolt is pushed to enable the inner end part of the bolt to be inserted into the slot, the bolt is used for locking the rotating shaft component to prevent the rotating shaft component from rotating relative to the shell, and when the outer end part of the bolt is released, the spring is used for driving the bolt to move outwards to reset so that the inner end part of the bolt is separated from the slot; the electric grinder also comprises a support sleeve and a rotating sleeve, wherein the support sleeve is sleeved outside the shell and is circumferentially limited on the shell, the rotating sleeve is rotatably sleeved outside the support sleeve, a protruding part is arranged on the inner wall of the rotating sleeve, an arc-shaped surface extending along the circumferential direction of the rotating sleeve is arranged on the inner wall of the protruding part, the arc-shaped surface gradually shrinks inwards from one end to the other end, and the outer end part of the plug pin abuts against the arc-shaped surface; when the rotating sleeve rotates towards one side relative to the supporting sleeve, the outer end part of the bolt gradually slides from one end of the arc-shaped surface to the other end of the arc-shaped surface so that the arc-shaped surface gradually pushes the bolt inwards, and when the rotating sleeve rotates towards the other side relative to the supporting sleeve, the outer end part of the bolt gradually slides from the other end of the arc-shaped surface to one end of the arc-shaped surface so that the arc-shaped surface gradually releases the bolt; a reset structure is arranged between the rotating sleeve and the supporting sleeve, and when the rotating sleeve is released, the reset structure is used for driving the rotating sleeve to enable the rotating sleeve to rotate and reset towards the other side relative to the supporting sleeve; the reset structure comprises a tension spring, one end of the tension spring is connected with the outer wall of the support sleeve, the other end of the tension spring is connected with the inner wall of the rotating sleeve, and when the rotating sleeve is released, the tension spring is used for driving the rotating sleeve to enable the rotating sleeve to rotate towards the other side relative to the support sleeve to reset; the outer wall of the shell is provided with at least one limiting bulge, the side wall of the support sleeve is provided with a limiting groove corresponding to each limiting bulge one by one, each limiting bulge is embedded into the limiting groove on the corresponding position, and the support sleeve and the shell are limited circumferentially through the limiting bulges and the limiting grooves; by adopting the reset structure, when the rotating sleeve is released, the tension spring can drive the rotating sleeve to enable the rotating sleeve to rotate towards the other side relative to the supporting sleeve for resetting, and the reset structure has the advantages of simple structure and low cost; through the setting of spacing arch and spacing groove, after supporting cover and casing assembly, every spacing arch homoenergetic is embedded into the spacing groove on the corresponding position to support and can conveniently realize the spacing purpose of circumference between cover and the casing.

By adopting the structure, the pushing of the bolt is realized by the rotation of the rotating sleeve, namely compared with the traditional mode of directly pushing the bolt by fingers, the pushing of the bolt is convenient, and the locking of the rotating shaft assembly is also convenient.

According to the electric grinder, the limit stop is arranged on the outer wall of the support sleeve, and when the rotating sleeve rotates towards the other side relative to the support sleeve to reset, the limit stop is used for abutting against the protruding part to limit the rotating sleeve to rotate continuously; through limit stop's setting, after rotating the cover and supporting the cover relatively and rotate the reset towards the opposite side, limit stop can support with the bulge and lean on in order to restrict to rotate the cover and continue to rotate to can avoid rotating the cover and appear by the excessive pivoted condition.

The electric grinder comprises a tension spring, a support sleeve, a rotating sleeve and a support sleeve, wherein the tension spring comprises an elastic part positioned in the middle, and a first pull ring and a second pull ring which are respectively connected to two ends of the elastic part; by adopting the structure, the first pull ring is connected with the support sleeve, and the tension spring can be reliably connected with the support sleeve and the rotating sleeve after the second pull ring is connected with the rotating sleeve.

The electric grinder is characterized in that the outer wall of the support sleeve is provided with a first inserting column and a first caulking groove, the first inserting column is inserted into the first pull ring in a matched mode, and the first caulking groove is embedded into a tension spring positioned between the first pull ring and the elastic part; after adopting this kind of structure, first pull ring can be conveniently and reliably with support the cover and link together, and under the effect of first caulking groove, when the elastic component stretches out and draws back, can avoid first pull ring first grafting post pivoted condition relatively to appear, can ensure the tension force that the extension spring applyed to the rotating sleeve promptly.

The electric grinder is characterized in that the inner wall of the rotating sleeve is provided with a second inserting column and a second caulking groove, the second inserting column is inserted into the second pull ring in a matched mode, and the second caulking groove is embedded into a tension spring between the second pull ring and the elastic part; after adopting this kind of structure, the second pull ring can be conveniently and reliably be in the same place with rotating the cover and connecting, and under the effect of second caulking groove, when the elastic component stretches out and draws back, can avoid the second pull ring the second relative post pivoted condition of pegging graft to appear, can ensure promptly that the extension spring is to the pulling force that the rotating sleeve applyed.

The electric grinder comprises a support, a circuit board, a rotating ring, a gear and an end cover, wherein the front end of the support is inserted into the shell and fixed with the shell, the rear end of the support extends out of the shell, the rear end of the support is provided with a concave cavity, the circuit board is fixed in the concave cavity, a speed regulation knob is fixed on the circuit board, the gear is fixed with an adjusting end of the speed regulation knob, the rotating ring is rotatably sleeved outside the rear end of the support, a rack part is arranged on the inner wall of the rotating ring and in the circumferential direction of the rotating ring, the gear is meshed with the rack part, and the end cover is fixed at the rear end of the support and used for sealing the concave cavity; after adopting above-mentioned structure, when the rotational speed that the electric grinder drove the bistrique needs to be adjusted, only need to rotate the rotation circle so that the regulation end that the rotation circle drove the speed governing knob rotates and can realize to can drive the regulation of bistrique pivoted speed for the electric grinder and bring the convenience.

The electric grinder is characterized in that a circumferential limiting structure is arranged between the rotating ring and the support and used for limiting the rotating angle range of the rotating ring relative to the support; through setting up of circumference limit structure, under circumference limit structure's effect, can restrict the relative support pivoted angle scope of rolling circle, can avoid the rolling circle excessively pivoted condition to appear promptly, also can avoid the regulation end of speed governing knob to appear by excessively pivoted condition to can avoid the damage of speed governing knob.

The electric grinder comprises a rotating ring, wherein the rotating ring is arranged on the outer side of the rotating ring, and the circumferential limiting structure comprises an arc-shaped groove arranged on the inner wall of the rotating ring; when the rotating ring rotates relative to the bracket, the lug is used for abutting against the end part of the arc-shaped groove so as to limit the rotating angle range of the rotating ring relative to the bracket; after the circumferential limiting structure is adopted, when the rotating ring rotates forwards or backwards relative to the support, the convex block can finally abut against one end part of the arc-shaped groove respectively, so that the rotating angle range of the rotating ring relative to the support can be conveniently limited.

The electric grinder is characterized in that a plurality of anti-slip grooves are circumferentially arranged on the outer wall of the rotating ring, and each anti-slip groove extends along the axial direction of the rotating ring; after the plurality of anti-skidding grooves are formed in the outer wall of the rotating ring, when the anti-skidding sleeve is rotated by fingers, the friction force between the fingers and the rotating ring can be increased under the action of the anti-skidding grooves, and therefore the anti-skidding function can be achieved.

The electric grinder is characterized in that the outer wall of the support is provided with an annular convex edge, and the annular convex edge is abutted against the rear end of the shell; a pair of clamping hooks is arranged on the outer wall of the support positioned on the front side of the annular convex edge, an annular clamping groove is arranged on the inner wall of the shell, and each clamping hook is matched and clamped with the annular clamping groove; by adopting the structure, the bracket can be conveniently matched and clamped with the shell, namely the bracket can be conveniently fixed with the shell; the end cover is provided with a plurality of screw holes and is fixed with the bracket through screws which are arranged in the screw holes in a penetrating way and are in threaded connection with the bracket; by adopting such a structure, the end cap can be reliably fixed to the rear end of the bracket.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a first perspective view of the present invention;

FIG. 2 is a schematic perspective sectional view of the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 2;

FIG. 4 is a first partially exploded perspective view of the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 4;

FIG. 6 is a schematic perspective view of the present invention with the rotating sleeve and the tension spring removed;

FIG. 7 is a first perspective view of the rotating sleeve;

FIG. 8 is a second perspective view of the rotating sleeve;

FIG. 9 is a second perspective view of the present invention;

FIG. 10 is a second partially exploded perspective view of the present invention;

FIG. 11 is a partially exploded perspective view of the present invention with the end cap removed;

fig. 12 is a schematic cross-sectional structure of the present invention.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such practical details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings for the sake of simplicity.

In addition, the descriptions related to "first", "second", etc. in the present invention are used for descriptive purposes only, do not specifically refer to an order or sequence, and do not limit the present invention, but merely distinguish components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1-12, the electric grinder of the present invention comprises a housing 1, a motor 2, a rotating shaft assembly 3 and a grinding head 31, wherein the motor 2 is fixed inside the housing 1, the rear end of the rotating shaft assembly 3 is in transmission connection with an output shaft of the motor 2, and the front end of the rotating shaft assembly 3 extends out of the housing 1 and is in transmission connection with the grinding head 31; a bolt 41 vertical to the rotating shaft component 3 is movably arranged on the side wall of the shell 1 in a penetrating mode, a slot 32 used for inserting an inner end portion of the bolt 41 is formed in the side wall of the rotating shaft component 3, a spring 42 is sleeved on the bolt 41 positioned on the outer side of the shell 1, a clamp spring 43 used for preventing the bolt 41 from being separated from the shell 1 is matched and clamped on the bolt 41 positioned on the inner side of the shell 1, when the outer end portion of the bolt 41 is pushed to enable the inner end portion of the bolt 41 to be inserted into the slot 32, the bolt 41 is used for locking the rotating shaft component 3 to prevent the rotating shaft component 3 from rotating relative to the shell 1, and when the outer end portion of the bolt 41 is released, the spring 42 is used for driving the bolt 41 to move outwards to reset to enable the inner end portion of the bolt 41 to be separated from the slot 32; the electric grinder also comprises a support sleeve 5 and a rotating sleeve 6, wherein the support sleeve 5 is sleeved outside the shell 1 and is circumferentially limited on the shell 1, the rotating sleeve 6 is rotatably sleeved outside the support sleeve 5, a protruding part 61 is arranged on the inner wall of the rotating sleeve 6, an arc-shaped surface 62 extending along the circumferential direction of the rotating sleeve 6 is arranged on the inner wall of the protruding part 61, the arc-shaped surface 62 gradually shrinks inwards from one end to the other end, and the outer end part of the plug pin 41 is abutted against the arc-shaped surface 62; when the rotating sleeve 6 rotates towards one side relative to the supporting sleeve 5, the outer end part of the bolt 41 gradually slides from one end of the arc-shaped surface 62 to the other end of the arc-shaped surface 62 so that the arc-shaped surface 62 gradually pushes the bolt 41 inwards, and when the rotating sleeve 6 rotates towards the other side relative to the supporting sleeve 5, the outer end part of the bolt 41 gradually slides from the other end of the arc-shaped surface 62 to one end of the arc-shaped surface 62 so that the arc-shaped surface 62 gradually releases the bolt 41; a reset structure is arranged between the rotating sleeve 6 and the supporting sleeve 5, and when the rotating sleeve 6 is released, the reset structure is used for driving the rotating sleeve 6 to enable the rotating sleeve 6 to rotate and reset towards the other side relative to the supporting sleeve 5; the reset structure comprises a tension spring 7, one end of the tension spring 7 is connected with the outer wall of the support sleeve 5, the other end of the tension spring 7 is connected with the inner wall of the rotating sleeve 6, and when the rotating sleeve 6 is released, the tension spring 7 is used for driving the rotating sleeve 6 to enable the rotating sleeve 6 to rotate towards the other side relative to the support sleeve 5 for resetting; the outer wall of the shell 1 is provided with at least one limiting protrusion 11, the side wall of the support sleeve 5 is provided with a limiting groove 51 corresponding to each limiting protrusion 11 one by one, each limiting protrusion 11 is embedded into the limiting groove 51 at the corresponding position, and the support sleeve 5 and the shell 1 are limited circumferentially through the limiting protrusions 11 and the limiting grooves 51; by adopting the reset structure, when the rotating sleeve is released, the tension spring can drive the rotating sleeve to enable the rotating sleeve to rotate towards the other side relative to the supporting sleeve for resetting, and the reset structure has the advantages of simple structure and low cost; through the setting of spacing arch and spacing groove, support cover and casing assembly back, every spacing arch homoenergetic is embedded into the spacing groove on corresponding the position to can conveniently realize the spacing purpose of circumference between support cover and the casing.

The outer wall of the support sleeve 5 is provided with a limit stop 52, and after the rotating sleeve 6 rotates towards the other side relative to the support sleeve 5 and resets, the limit stop 52 is used for abutting against the convex part 61 to limit the rotating sleeve 6 to rotate continuously; through limit stop's setting, after rotating the cover and supporting the cover relatively and rotate the reduction towards the opposite side, limit stop can support with the bulge and lean on in order to restrict to rotate the cover and continue to rotate to can avoid rotating the cover and appear by the excessive pivoted condition.

The tension spring 7 comprises an elastic part 71 positioned in the middle, and a first pull ring 72 and a second pull ring 73 which are respectively connected with two ends of the elastic part 71, wherein the first pull ring 72 is connected with the support sleeve 5, and the second pull ring 73 is connected with the rotating sleeve 6; by adopting the structure, the tension spring can be reliably connected with the supporting sleeve and the rotating sleeve together after the first pull ring is connected with the supporting sleeve and the second pull ring is connected with the rotating sleeve.

A first inserting column 53 and a first embedded groove 54 are arranged on the outer wall of the support sleeve 5, the first inserting column 53 is inserted with the first pull ring 72 in a matching manner, and the first embedded groove 54 is embedded with the tension spring 7 positioned between the first pull ring 72 and the elastic part 71; after adopting this kind of structure, first pull ring can be conveniently and reliably link together with supporting the cover, and under the effect of first caulking groove, when the elastic component stretches out and draws back, can avoid first pull ring first grafting post pivoted condition relatively to appear, can ensure promptly that the extension spring is to the tension force that the rotating sleeve applyed.

A second inserting column 63 and a second caulking groove 64 are arranged on the inner wall of the rotating sleeve 6, the second inserting column 63 is inserted into the second pull ring 73 in a matching manner, and the second caulking groove 64 is embedded into the tension spring 7 between the second pull ring 73 and the elastic part 71; after adopting this kind of structure, the second pull ring can be conveniently and reliably be in the same place with rotating the cover and be connected, and under the effect of second caulking groove, when the elastic component stretches out and draws back, can avoid the second pull ring relative second plug column pivoted condition to appear, can ensure promptly that the extension spring is to the tension force that the rotating sleeve applyed.

The electric grinder also comprises a support 81, a circuit board 82, a rotating ring 83, a gear 84 and an end cover 85, wherein the front end of the support 81 is inserted into the shell 1 and fixed with the shell 1, the rear end of the support 81 extends out of the shell 1, the rear end of the support 81 is provided with a concave cavity 811, the circuit board 82 is fixed in the concave cavity 811, the circuit board 82 is fixed with a speed regulation knob 86, the gear 84 is fixed with the regulation end of the speed regulation knob 86, the rotating ring 83 is rotatably sleeved outside the rear end of the support 81, a rack part 831 is arranged on the inner wall of the rotating ring 83 and along the circumferential direction of the rotating ring 83, the gear 84 is meshed with the rack part 831, and the end cover 85 is fixed at the rear end of the support 81 and used for closing the concave cavity 811; after the structure is adopted, when the rotation speed of the grinding head driven by the electric grinder needs to be adjusted, the adjustment can be realized only by rotating the rotating ring to enable the rotating ring to drive the adjusting end of the speed adjusting knob to rotate, so that convenience can be brought to the adjustment of the rotation speed of the grinding head driven by the electric grinder.

A circumferential limiting structure is arranged between the rotating ring 83 and the support 81 and is used for limiting the rotating angle range of the rotating ring 83 relative to the support 81; through the setting of circumference limit structure, under circumference limit structure's effect, can restrict the relative support pivoted angle scope of circle of rotating, can avoid the circle of rotating to appear excessive pivoted condition promptly, also can avoid the regulation end of speed governing knob to appear by the excessive pivoted condition to can avoid the damage of speed governing knob.

The circumferential limiting structure comprises an arc-shaped groove 832 arranged on the inner wall of the rotating ring 83, a lug 812 is arranged on the outer wall of the rear end of the bracket 81, and the lug 812 is inserted into the arc-shaped groove 832 and is in sliding connection with the arc-shaped groove 832; when the rotating ring 83 rotates relative to the bracket 81, the projection 812 is used for abutting against the end of the arc-shaped groove 832 so as to limit the rotating angle range of the rotating ring 83 relative to the bracket 81; after the circumferential limiting structure is adopted, when the rotating ring rotates forwards or backwards relative to the support, the convex block can finally abut against one end part of the arc-shaped groove respectively, so that the rotating angle range of the rotating ring relative to the support can be conveniently limited.

A plurality of anti-slip grooves 833 are circumferentially arranged on the outer wall of the rotating ring 83, and each anti-slip groove 833 extends along the axial direction of the rotating ring 83; after the plurality of anti-skidding grooves are formed in the outer wall of the rotating ring, when the anti-skidding sleeve is rotated by fingers, the friction force between the fingers and the rotating ring can be increased under the action of the anti-skidding grooves, and therefore the anti-skidding function can be achieved.

An annular convex edge 813 is arranged on the outer wall of the support 81, and the annular convex edge 813 abuts against the rear end of the shell 1; a pair of hooks 814 is arranged on the outer wall of the bracket 81 positioned at the front side of the annular convex edge 813, an annular clamping groove 12 is arranged on the inner wall of the shell 1, and each hook 814 is matched and clamped with the annular clamping groove 12; by adopting the structure, the bracket can be conveniently matched and clamped with the shell, namely the bracket can be conveniently fixed with the shell; the end cover 85 is provided with a plurality of screw holes 851, and the end cover 85 is fixed with the bracket 81 through screws which are arranged in the screw holes 851 and are in threaded connection with the bracket 81; by adopting such a structure, the end cap can be reliably fixed to the rear end of the bracket.

In the process of using the invention, when the grinding head needs to be replaced, the rotating sleeve is rotated by fingers so that the rotating sleeve rotates towards one side relative to the supporting sleeve, at the moment, the outer end part of the bolt can gradually slide from one end of the arc-shaped surface to the other end of the arc-shaped surface, at the moment, the inner end part of the bolt can be inserted into the slot and locks the rotating shaft assembly, and the grinding head can be replaced after the rotating shaft assembly is locked; after the grinding head is replaced, and after the rotating sleeve is released by fingers, the reset structure can drive the rotating sleeve to enable the rotating sleeve to rotate towards the other side to reset relatively to the supporting sleeve, at the moment, the outer end portion of the bolt can gradually slide to one end of the arc-shaped surface from the other end of the arc-shaped surface, and at the moment, the inner end portion of the bolt can be separated from the slot and lock the rotating shaft assembly.

When the electric grinder is used, the rotating ring can be rotated towards one direction when the rotating speed of the electric grinder needs to be increased, and at the moment, the rotating ring can drive the adjusting end of the speed adjusting knob to rotate towards one direction, so that the rotating speed of the electric grinder can be increased under the action of the speed adjusting knob; when the rotating speed of the electric grinder needs to be reduced, the rotating ring can be rotated towards the other direction, at the moment, the rotating ring can drive the adjusting end of the speed adjusting knob to rotate towards the other direction, and therefore the rotating speed of the electric grinder can be reduced under the action of the speed adjusting knob.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric grinder comprises a shell (1), a motor (2), a rotating shaft assembly (3) and a grinding head (31), wherein the motor (2) is fixed inside the shell (1), the rear end of the rotating shaft assembly (3) is in transmission connection with an output shaft of the motor (2), and the front end of the rotating shaft assembly (3) extends out of the shell (1) and is in transmission connection with the grinding head (31); a bolt (41) perpendicular to the rotating shaft assembly (3) is movably arranged on the side wall of the shell (1) in a penetrating mode, a slot (32) used for inserting the inner end portion of the bolt (41) is formed in the side wall of the rotating shaft assembly (3), a spring (42) is sleeved on the bolt (41) located on the outer side of the shell (1), a clamping spring (43) used for preventing the bolt (41) from being separated from the shell (1) is clamped on the bolt (41) located on the inner side of the shell (1) in a matching mode, when the outer end portion of the bolt (41) is pushed, so that the inner end portion of the bolt (41) is inserted into the slot (32), the bolt (41) is used for locking the rotating shaft assembly (3) to avoid the rotating shaft assembly (3) from rotating relative to the shell (1), and when the outer end portion of the bolt (41) is released, the spring (42) is used for driving the bolt (41) to move outwards to reset so that the inner end portion of the bolt (41) is separated from the slot (32); the method is characterized in that: the electric grinder also comprises a support sleeve (5) and a rotating sleeve (6), wherein the support sleeve (5) is sleeved outside the shell (1) and is limited on the shell (1) in the circumferential direction, the rotating sleeve (6) is rotatably sleeved outside the support sleeve (5), a protruding part (61) is arranged on the inner wall of the rotating sleeve (6), an arc-shaped surface (62) extending along the circumferential direction of the rotating sleeve (6) is arranged on the inner wall of the protruding part (61), the arc-shaped surface (62) gradually shrinks inwards from one end to the other end, and the outer end part of the bolt (41) is abutted against the arc-shaped surface (62); when the rotating sleeve (6) rotates towards one side relative to the supporting sleeve (5), the outer end part of the bolt (41) gradually slides from one end of the arc-shaped surface (62) to the other end of the arc-shaped surface (62) so that the arc-shaped surface (62) gradually pushes the bolt (41) inwards, and when the rotating sleeve (6) rotates towards the other side relative to the supporting sleeve (5), the outer end part of the bolt (41) gradually slides from the other end of the arc-shaped surface (62) to one end of the arc-shaped surface (62) so that the arc-shaped surface (62) gradually releases the bolt (41); a reset structure is arranged between the rotating sleeve (6) and the supporting sleeve (5), and when the rotating sleeve (6) is released, the reset structure is used for driving the rotating sleeve (6) to enable the rotating sleeve (6) to rotate towards the other side relative to the supporting sleeve (5) for resetting; the reset structure comprises a tension spring (7), one end of the tension spring (7) is connected with the outer wall of the support sleeve (5), the other end of the tension spring (7) is connected with the inner wall of the rotating sleeve (6), and when the rotating sleeve (6) is released, the tension spring (7) is used for driving the rotating sleeve (6) to enable the rotating sleeve (6) to rotate towards the other side relative to the support sleeve (5) for resetting; be provided with at least one spacing arch (11) on the outer wall of casing (1), be provided with on the lateral wall of support cover (5) with every spacing groove (51) of spacing arch (11) one-to-one, every spacing arch (11) all imbed in spacing groove (51) on corresponding position, it is spacing through spacing arch (11) and spacing groove (51) circumference to support cover (5) and casing (1).

2. The electric grinder according to claim 1, wherein the outer wall of the support sleeve (5) is provided with a limit stop (52), and after the rotating sleeve (6) is rotated and reset towards the other side relative to the support sleeve (5), the limit stop (52) is used for abutting against the protrusion (61) to limit the rotating sleeve (6) to rotate continuously.

3. The electric grinder according to claim 1 or 2, characterized in that the tension spring (7) comprises an elastic portion (71) in the middle and a first pull ring (72) and a second pull ring (73) connected to the two ends of the elastic portion (71), respectively, the first pull ring (72) being connected to the support sleeve (5) and the second pull ring (73) being connected to the rotating sleeve (6).

4. The electric grinder as claimed in claim 3, wherein the outer wall of the support sleeve (5) is provided with a first plug-in post (53) and a first caulking groove (54), the first plug-in post (53) is in fit plug-in connection with a first pull ring (72), and the first caulking groove (54) is embedded with a tension spring (7) between the first pull ring (72) and the elastic part (71).

5. The electric grinder as claimed in claim 3, wherein the inner wall of the rotating sleeve (6) is provided with a second plug-in post (63) and a second caulking groove (64), the second plug-in post (63) is in fit plug-in connection with a second pull ring (73), and the second caulking groove (64) is embedded with a tension spring (7) between the second pull ring (73) and the elastic part (71).

6. The electric grinder according to claim 1, characterized in that the electric grinder further comprises a bracket (81), a circuit board (82), a rotating ring (83), a gear (84) and an end cover (85), wherein the front end of the bracket (81) is inserted into the housing (1) and fixed with the housing (1), the rear end of the bracket (81) extends out of the housing (1), the rear end of the bracket (81) is provided with a cavity (811), the circuit board (82) is fixed in the cavity (811), the circuit board (82) is fixed with a speed adjusting knob (86), the gear (84) is fixed with an adjusting end of the speed adjusting knob (86), the rotating ring (83) is rotatably sleeved outside the rear end of the bracket (81), a rack portion (831) is arranged on the inner wall of the rotating ring (83) and in the circumferential direction of the rotating ring (83), the gear (84) is engaged with the rack portion (831), and the end cover (85) is fixed at the rear end of the bracket (81) and is used for closing the cavity (811).

7. The electric grinder according to claim 6, characterized in that a circumferential stop is provided between the rotating ring (83) and the support (81) for limiting the angular range of rotation of the rotating ring (83) relative to the support (81).

8. The electric grinder according to claim 7, characterized in that the circumferential limiting structure comprises an arc-shaped groove (832) arranged on the inner wall of the rotating ring (83), a lug (812) is arranged on the outer wall of the rear end of the bracket (81), and the lug (812) is inserted into the arc-shaped groove (832) and is slidably connected with the arc-shaped groove (832); when the rotating ring (83) rotates relative to the bracket (81), the lug (812) is used for abutting against the end part of the arc-shaped groove (832) to limit the rotating angle range of the rotating ring (83) relative to the bracket (81).

9. The electric grinder according to claim 6, characterized in that the outer wall of the rotating ring (83) is circumferentially provided with a plurality of anti-slip grooves (833), each anti-slip groove (833) extending in the axial direction of the rotating ring (83).

10. The electric grinder according to claim 6, characterized in that the outer wall of the support (81) is provided with an annular convex edge (813), and the annular convex edge (813) abuts against the rear end of the housing (1); a pair of hooks (814) is arranged on the outer wall of the bracket (81) positioned on the front side of the annular convex edge (813), an annular clamping groove (12) is arranged on the inner wall of the shell (1), and each hook (814) is matched and clamped with the annular clamping groove (12); the end cover (85) is provided with a plurality of screw holes (851), and the end cover (85) is fixed with the support (81) through screws which are arranged in the screw holes (851) in a penetrating manner and are in threaded connection with the support (81).