CN217530355U - Safety protection mechanism for power output end of polishing tool and electric sander - Google Patents

Abstract

The utility model discloses a grinding tool power take off end safety protection mechanism and electric sander belongs to the grinding tool field. The utility model discloses a safety protection mechanism, including locating the power take off spare on the organism, the lower extreme endwise slip ground of power take off spare is equipped with the protective cover, is equipped with the through-hole that the connecting portion that supplies power take off spare lower part to pass on the protective cover, is equipped with the elastic component between protective cover and the power take off spare. The utility model has the advantages that the protective cover is arranged on the power output part, and after the grinding accessory is disassembled, the protective cover can cover the connecting part of the power output part under the action of the elastic part, thereby playing a role in protection and preventing the power output part from being exposed to cause potential safety hazards; the protective cover can slide inwards and contract, normal installation and use of the polishing accessory cannot be influenced, and the protective cover can be applied to polishing tools with detachable polishing accessories, such as a sander and the like; the device has the advantages of simple and ingenious structural design, easiness in implementation, safety, stability, low manufacturing cost, wide application range and the like.

Description

Polishing tool power take off end safety protection mechanism and electric sander

Technical Field

The utility model relates to a grinding tool, more specifically say, relate to a grinding tool power take off end safety protection mechanism and electric sander.

Background

When a workpiece is ground or polished, grinding tools such as a sander and the like are commonly used, and are popular among users due to convenience and flexibility. The sander has a casing with a driving unit connected via a transmission unit to a working bottom plate, and a bottom plate with abrasive material such as sand paper. When the grinding machine works, the driving device drives the bottom plate assembly to eccentrically or rotationally move, the bottom plate accessory attached to the bottom plate assembly correspondingly moves, and the working surface is ground, so that the working surface is smooth and flat.

For different polishing environments, base plates with different shapes, such as rectangle, circle, triangle, etc., can be selected on the sander to meet different sanding conditions, so that the sander is required to have the function that the base plates are easy to disassemble and replace. Chinese patent No. ZL201821738178.6 discloses "sander of grinder bottom plate easy dismounting mechanism and applied its", its bottom plate easy dismounting mechanism locates between the connecting seat of grinder bottom plate and grinder, including installing the locking lever on the grinder bottom plate and locating the pothook of connecting seat lower part, the working part of locking lever rotates and installs on the upper portion of grinder bottom plate connecting end, and the working part of locking lever be equipped with can be through rotating the locking lever and with the pothook lock on the connecting seat or the buckling part that breaks away from, the one end of locking lever still is equipped with and is used for driving the operating handle of working part pivoted. This patent application utilizes locking lever and pothook cooperation to realize the quick connection of bottom plate and grinder organism and tear open and trade, and the structure sets up simply, assembly convenient operation. However, after the base plate of the sander is disassembled, the power output end of the sander body has an exposed hook and positioning column structure, and when the base plate is not installed, the sander body is started by mistake, which is easy to cause safety risk due to the accidental rotation of the exposed hook and the positioning column.

In addition, in similar sanding tools, after the sanding head is removed, there are mostly exposed power take-off components, which are also prone to safety problems due to mis-activation of the tool. There is a need for an improved sanding tool that is safe to use.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The utility model aims to overcome the defect that the power output part of the existing polishing tool brings potential safety hazards due to error starting, and provides a power output end safety protection mechanism of the polishing tool and an electric sander, by adopting the technical scheme of the utility model, through arranging the protective cover which can elastically move in a telescopic way on the power output part, after the polishing accessory is disassembled, the protective cover can cover the connecting part of the power output part under the action of the elastic part, thereby playing a protection role and preventing the power output part from being exposed to cause potential safety hazards; in addition, the protective cover can slide inwards and contract, the normal installation and use of the polishing accessory cannot be influenced, and the protective cover can be applied to polishing tools with detachable polishing accessories, such as a sander and the like; has the advantages of simple and ingenious structural design, easy implementation, safety, stability, low manufacturing cost, wide application range and the like.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a grinding tool power take off end safety protection mechanism, including locating the power take off spare that is used for with the detachable connection of grinding annex on the organism, the lower extreme of power take off spare be equipped with the protective cover axially slidably, the protective cover on be equipped with the through-hole that the connecting portion that supplies the power take off spare lower part passed, be equipped with the elastic component between protective cover and the power take off spare, the protective cover have first position and second position for the power take off spare;

when the protective cover is in the first position, the grinding accessory is separated from the power output part, and the protective cover is positioned at the lower part of the power output part under the action of the elastic part, so that the connecting part at the lower part of the power output part is covered;

when the protective cover is in the second position, the accessory of polishing combine together with power take off spare, the protective cover removes the upper portion to power take off spare under the accessory effect of polishing, stretches out and is connected with the accessory of polishing for the connecting portion of power take off spare lower part.

Furthermore, the elastic element is a pagoda spring.

Furthermore, the periphery of the protective cover is also provided with a circle of upward circular protective wall which can cover the connecting part at the lower part of the power output part from the periphery when the protective cover is at the first position.

Further, the inboard of protective cover be equipped with the spacing buckle that upwards extends, power take off spare on be equipped with the corresponding buckle hole in above-mentioned spacing buckle position, spacing buckle stretch into the buckle hole that corresponds, and spacing buckle can be at the downthehole axial motion of buckle to clip through spacing buckle top and the outer edge in buckle hole are spacing.

The utility model discloses an electric sander, including organism and the annex of polishing, the organism on be equipped with the power take off spare that is used for connecting the annex of polishing, the annex of polishing adopt quick change mechanism detachable connection with power take off spare, this electric sander has foretell polishing tool power take off end safety protection mechanism.

Furthermore, the quick change mechanism including locate the locking piece on the annex of polishing and locate the pothook of power take off spare lower part, the locking piece on be equipped with can through rotating the locking piece and with the pothook lock on the power take off spare locking or break away from the buckling part of unblock, the one end of locking piece still be equipped with the handle, the protective cover on be equipped with the through-hole that supplies the pothook to pass.

Furthermore, the lower part of the power output part is also provided with a positioning column, the polishing accessory is provided with a positioning hole corresponding to the positioning column in position, and the protective cover is also provided with a through hole for the positioning column to pass through.

Furthermore, the grinding accessory is a triangular bottom plate, a round bottom plate or a rectangular bottom plate.

Furthermore, a driving motor is arranged in the machine body, an eccentric shaft is fixed on a motor shaft of the driving motor, a bearing frame is installed on the eccentric shaft through a bearing, the power output part is fixed on the bearing frame, and the eccentric shaft rotates to drive the power output part to do random orbital motion or revolution orbital motion.

Furthermore, the motor shaft is also provided with a fan, the eccentric shaft is fixedly connected with the motor shaft through a locking bolt screwed on the motor shaft, and the power output part is fixed at the lower part of the bearing frame through a screw.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following beneficial effect:

(1) The utility model discloses a grinding tool power take off end safety protection mechanism and electric sander, it is through setting up the protective cover that can elastically stretch out and draw back the motion on power take off spare, after the accessory dismantlement of polishing, the protective cover can cover the connecting portion of power take off spare under the effect of elastic component, and then play the guard action, prevent that power take off spare from exposing and causing the potential safety hazard; in addition, the protective cover can slide inwards and contract, the normal installation and use of the polishing accessory cannot be influenced, and the protective cover can be applied to polishing tools with detachable polishing accessories, such as a sander and the like; the structure has the advantages of simple and ingenious structural design, easy implementation, safety, stability, low manufacturing cost, wide application range and the like;

(2) The utility model discloses a safety protection mechanism for the power output end of a polishing tool and an electric sander, wherein an elastic part is a pagoda spring, and the elastic part occupies small space after being compressed, so that the matching structure of a protective cover and a power output part is more compact;

(3) The utility model discloses a polishing tool power take off end safety protection mechanism and electric abrasive finishing machine, the periphery of its protective cover still is equipped with round upward circular dado, and this circular dado can cover the connecting portion of power take off spare lower part from all around when the protective cover is in the first position, adopts the above-mentioned protective cover design, can cover power take off spare from a plurality of angles, can play the effect of preventing accidental injury more comprehensively;

(4) The utility model discloses a grinding tool power take off end safety protection mechanism and electric sander, the inboard of its protective cover is equipped with the spacing buckle that extends upwards, is equipped with the buckle hole corresponding with above-mentioned spacing buckle position on the power take off, spacing buckle stretches into corresponding buckle hole, and spacing buckle can be in the axial motion of buckle hole, and through the clip at spacing buckle top and the outer edge spacing of buckle hole, adopt the above-mentioned protective cover design, simple structure, easily shaping and assembly;

(5) The utility model discloses an electric sander, its quick change mechanism includes the locking piece that locates on the grinding attachment and locates the pothook of power take off spare lower part, be equipped with on the locking piece can through rotate the locking piece with the pothook lock on the power take off spare lock or break away from the lock part of unblock, one end of locking piece still is equipped with the handle, be equipped with the through-hole that supplies the pothook to pass on the protective cover, utilize foretell quick change mechanism can realize the quick assembly disassembly of sander bottom plate, structural design is simple, assembly operation is convenient, and firm reliable;

(6) The utility model discloses an electric sander, the lower part of its power take off spare still is equipped with the reference column, is equipped with the locating hole that the position corresponds with above-mentioned reference column on the grinding attachment, still is equipped with the through-hole that supplies the reference column to pass on the protective cover, utilizes above-mentioned location design, has made things convenient for the location of grinder bottom plate and power take off spare to be connected, and can transmit the moment of torsion better, improve the connection reliability of grinder bottom plate;

(7) The utility model discloses an electric sander, its organism can make random orbital motion or revolution orbital motion through the rotatory power take off that drives of eccentric shaft, can cooperate different grinder bottom plates to form different mode, makes the grinder use more nimble convenience, can satisfy different polishing scene and use needs.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of an electric sanding machine of the present invention;

fig. 2 is a schematic view of a base plate split state structure of the electric sanding machine of the present invention;

fig. 3 is a schematic diagram showing a disassembled state of a power output member and a protective cover in the electric sander of the present invention;

fig. 4 is a schematic view of the disassembly state of the safety protection mechanism for the power output end of the polishing tool of the present invention;

fig. 5 is a schematic structural view of the protective cover of the present invention in a first position on the polishing tool;

fig. 6 is a schematic view of the protective cover of the present invention in a second position on the polishing tool;

fig. 7 is a schematic view of a partial cross-sectional structure of an electric sander according to the present invention (disassembled bottom plate);

fig. 8 is a schematic view of a partial sectional structure of an electric sanding machine according to the present invention (bottom plate installed state).

The reference numerals in the schematic drawings illustrate:

1. a body; 1-1, motor shaft; 1-2, a fan; 1-3, an eccentric shaft; 1-4, locking bolts; 1-5, a bearing; 2. grinding the accessory; 2-1, a locking piece; 2-2, positioning holes; 3. a protective cover; 3-1, limiting buckles; 3-2, through holes; 4. a power take-off; 4-1, a hook; 4-2, a positioning column; 4-3, buckling holes; 4-4, passing through a hole; 5. an elastic member; 6. a bearing bracket; 6-1, screw holes.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.

With reference to fig. 1 to 8, the utility model discloses a grinding tool power take off end safety protection mechanism, including locating organism 1 on be used for with 2 detachable connections's of accessory that polish power take off 4, power take off 4 receives organism 1 control rotary motion, can drive 2 rotary motion of accessory that polish and polish the operation. The construction of the connection of the power take-off 4 differs according to the manner of connection of the grinding attachment 2 to the power take-off 4 and the type of grinding tool. Different with current grinding tool's structure, the lower extreme axial slip ground of power take off 4 is equipped with protective cover 3, is equipped with the through-hole 3-2 that the connecting portion that supply 4 lower parts of power take off passed on the protective cover 3, is equipped with elastic component 5 between protective cover 3 and the power take off 4, makes protective cover 3 can slide from top to bottom on power take off 4 axial, and protective cover 3 has primary importance and second place for power take off 4:

when protective cover 3 was in the first position, the annex 2 of polishing separated with 4 phase separations of power take off spare (the annex 2 dismantlement state of polishing), protective cover 3 was in the lower part of power take off spare 4 under the effect of elastic component 5, made the connecting portion of 4 lower parts of power take off spare cover, under this state, easily caused the connecting portion of injury to the user to be hidden inside protective cover 3 on the power take off spare 4, and then can effectively prevent the bodily injury that power take off spare 4 unexpected work and caused.

When protective cover 3 was in the second position, the annex 2 that polishes combined together with power take off 4 (the annex 2 mounted state of polishing), and protective cover 3 removes the upper portion to power take off 4 under the annex 2 effect of polishing, makes the connecting portion of power take off 4 lower part stretch out and be connected with the annex 2 of polishing. In this state, the protective cover 3 can be pushed by the grinding attachment 2 to move up, so that the connecting part of the power output part 4 is exposed to realize the connection with the grinding attachment 2, and the normal installation and use of the grinding attachment 2 cannot be influenced.

By adopting the safety protection mechanism, the protection cover capable of elastically stretching and retracting is arranged on the power output part, and after the grinding accessory is disassembled, the protection cover can cover the connecting part of the power output part under the action of the elastic part, so that the protection effect is achieved, and the potential safety hazard caused by the exposure of the power output part is prevented; the protective cover can slide inwards and contract, normal installation and use of the polishing accessory cannot be influenced, and the protective cover can be applied to a polishing tool with a detachable polishing accessory; has the advantages of simple and ingenious structural design, easy implementation, safety, stability, low manufacturing cost, wide application range and the like.

As shown in fig. 3 and 4, in the present embodiment, in order to make the power output element 4 and the protecting cover 3 more compactly engaged, the elastic element 5 is preferably a pagoda spring, and the pagoda spring has a spiral reducing structure, and occupies a small space after being compressed, so that the engaging structure of the protecting cover 3 and the power output element 4 is more compactly engaged. As shown in fig. 3 and 4, an upward circular guard wall is provided at the outer periphery of the protecting cover 3, and the circular guard wall can cover the connecting portion at the lower part of the power output member 4 from the periphery when the protecting cover 3 is at the first position. By adopting the design of the protective cover 3, the power output part 4 can be covered from a plurality of angles, and the function of preventing accidental injury can be more comprehensively achieved.

Further, as shown in fig. 3 and 4, the inner side of the protecting cover 3 is provided with a limit buckle 3-1 extending upward, the limit buckle 3-1 has a certain height, the power output element 4 is provided with a buckle hole 4-3 corresponding to the position of the limit buckle 3-1, the limit buckle 3-1 extends into the corresponding buckle hole 4-3, and the limit buckle 3-1 can axially move in the buckle hole 4-3 and is limited by a clasp at the top of the limit buckle 3-1 and the outer edge of the buckle hole 4-3. Adopt above-mentioned protective cover 3 design, simple structure, easily shaping and assembly. In this embodiment, three limiting buckles 3-1 can be evenly arranged on the protective cover 3 along the circumferential direction, so that the protective cover 3 can slide on the power output part 4 more stably.

The utility model discloses in grinding tool can be the grinder that is used for the polishing and the angle mill that is used for the grinding etc. correspondingly, the annex 2 that polishes is grinder bottom plate or angle mill emery wheel etc..

The present invention will be further described with reference to the following examples.

[ examples ]

This embodiment is an electric sander. Referring to fig. 1 to 8, the electric sander comprises a sander body 1 and a grinding accessory 2, wherein the grinding accessory 2 is a sander base plate, a power output part 4 for connecting the grinding accessory 2 is arranged on the sander body 1, and the power output part 4 is controlled to rotate to drive the grinding accessory 2 to rotate for polishing. The grinding accessory 2 is detachably connected with the power output part 4 through a quick-change mechanism, so that the grinding accessory 2 can be quickly disassembled and replaced conveniently. The electric sanding machine is provided with the safety protection mechanism for the power output end of the sanding tool. Namely: a protective cover 3 is axially and slidably arranged at the lower end of the power output part 4, a through hole 3-2 for a connecting part at the lower part of the power output part 4 to pass through is arranged on the protective cover 3, an elastic part 5 is arranged between the protective cover 3 and the power output part 4, and the protective cover 3 has a first position and a second position relative to the power output part 4. When the protective cover 3 is at the first position, the grinding accessory 2 is separated from the power output part 4, the protective cover 3 is positioned at the lower part of the power output part 4 under the action of the elastic part 5, so that the connecting part at the lower part of the power output part 4 is covered; when protective cover 3 was in the second position, the annex 2 that polishes combined together with power take off 4, and protective cover 3 removes to the upper portion of power take off 4 under the effect of the annex 2 that polishes, makes the connecting portion of 4 lower parts of power take off stretch out and be connected with the annex 2 that polishes.

In this embodiment, the elastic member 5 is a pagoda spring. The periphery of the protective cover 3 is also provided with a circle of upward circular protective wall which can cover the connecting part at the lower part of the power output part 4 from the periphery when the protective cover 3 is at the first position. The inner side of the protective cover 3 is provided with a limit buckle 3-1 extending upwards, the power output part 4 is provided with a buckle hole 4-3 corresponding to the position of the limit buckle 3-1, the limit buckle 3-1 extends into the corresponding buckle hole 4-3, and the limit buckle 3-1 can axially move in the buckle hole 4-3 and is limited with the outer edge of the buckle hole 4-3 through a clasp at the top of the limit buckle 3-1.

As shown in fig. 2 to 6, in the present embodiment, the quick-change mechanism includes a locking member 2-1 disposed on the grinding accessory 2 and a hook 4-1 disposed on a lower portion of the power output member 4, the locking member 2-1 adopts a locking rod structure, the locking member 2-1 is provided with a locking portion capable of being locked with or unlocked from the hook 4-1 on the power output member 4 by rotating the locking member 2-1, one end of the locking member 2-1 is further provided with an operating handle, and the protective cover 3 is provided with a through hole 3-2 for the hook 4-1 to pass through. The quick-change mechanism can be used for quickly disassembling and assembling the base plate of the sanding machine, and is simple in structural design, convenient to assemble and operate, firm and reliable. The lower part of the power output part 4 is also provided with a positioning column 4-2, the grinding accessory 2 is provided with a positioning hole 2-2 corresponding to the positioning column 4-2, and the protective cover 3 is also provided with a through hole 3-2 for the positioning column 4-2 to pass through. By utilizing the positioning design, the base plate of the sander can be conveniently positioned and connected with the power output part 4, the torque can be better transmitted, and the connection reliability of the base plate of the sander is improved. Other specific structures and working principles related to the quick-change mechanism in this embodiment are similar to the patent application of "a sander base plate easy-to-replace mechanism and a sander using the same" disclosed in patent No. 201821738178.6, and are not described herein again.

The embodiment is an electric sander, wherein the sanding accessory 2 is a triangular bottom plate, a circular bottom plate or a rectangular bottom plate, the triangular bottom plate, the circular bottom plate and the rectangular bottom plate are respectively provided with the locking piece 2-1, and the electric sander can be selected to be suitable according to different working requirements. Further, as shown in fig. 7 and 8, a driving motor is arranged in the sander body 1, an eccentric shaft 1-3 is fixed on a motor shaft 1-1 of the driving motor, a bearing frame 6 is mounted on the eccentric shaft 1-3 through a bearing 1-5, a power output member 4 is fixed on the bearing frame 6, and the eccentric shaft 1-3 rotates to drive the power output member 4 to make random orbital motion or revolution orbital motion. Generally, when the triangular bottom plate and the rectangular bottom plate are connected with the power output part 4, the triangular bottom plate and the rectangular bottom plate are also connected with the machine body 1 through the swing bracket, and at the moment, the bottom plates only do revolution motion around the motor shaft 1-1 and belong to revolution orbital motion bottom plates; the circular bottom plate is only connected with the power output part 4, does revolution motion around the motor shaft 1-1 and also does rotation motion around the eccentric shaft 1-3, and belongs to a random orbital motion bottom plate.

Specifically, in the embodiment, the motor shaft 1-1 is further provided with a fan 1-2, the fan 1-2 can adopt an upper and lower double-blade design, the fan blades at the lower part are used for sucking dust, and the fan blades at the upper part are used for heat dissipation of the motor. The eccentric shaft 1-3 is fixedly connected with the motor shaft 1-1 through a locking bolt 1-4 screwed on the motor shaft 1-1, and the power output part 4 is fixed at the lower part of the bearing frame 6 through a screw. As shown in fig. 4, a screw hole 6-1 is formed in the bearing frame 6, a through hole 4-4 is formed in a position corresponding to the power output member 4, when the power output member 4 is mounted, the lower portion of the power output member 4 and the lower portion of the bearing frame 6 are positioned, and then a screw penetrates through the through hole 4-4 and is screwed into the screw hole 6-1, so that the power output member 4 and the bearing frame 6 are fixedly connected.

Other structural designs in the sander body are similar to those of the existing sanders, and are not described further herein.

In order to further understand the content of the present invention, the working principle of the safety protection mechanism for the power output end of the polishing tool and the electric polishing machine of the present invention will now be further explained with reference to fig. 7 and 8.

As shown in fig. 7, when the grinding attachment 2 is not installed, the protecting cover 3 is located at the lower part (i.e. the first position) of the power output part 4 under the action of the elastic member 5, at this time, the protecting cover 3 blocks the connecting part at the lower part of the power output part 4, the protecting cover 3 is used for preventing a user from contacting the power output part 4, and due to the smooth surface of the protecting cover 3, even if the grinding tool is started by mistake, the user cannot be injured, and a good protecting effect is achieved. As shown in fig. 8, when the grinding attachment 2 is installed, the grinding attachment 2 pushes the protective cover 3 upwards, the elastic member 5 compresses, the protective cover 3 moves upwards, the connecting portion (the hook 4-1 and the positioning column 4-2) at the lower portion of the power output member 4 is exposed, the grinding attachment 2 can be fixedly connected with the power output member 4, and the grinding attachment 2 is driven by the driving motor to move eccentrically or rotate to perform grinding operation.

The utility model discloses a grinding tool power take off end safety protection mechanism and electric sander, it is through setting up the protective cover that can elastically stretch out and draw back the motion on power take off spare, after the accessory dismantlement of polishing, the protective cover can cover the connecting portion of power take off spare under the effect of elastic component, and then plays the guard action, prevents that power take off spare from exposing and causing the potential safety hazard, has satisfied the ann rule requirement of product; in addition, the protective cover can slide inwards and contract, the normal installation and use of the polishing accessory cannot be influenced, and the protective cover can be applied to polishing tools with detachable polishing accessories, such as a sander and the like; has the advantages of simple and ingenious structural design, easy implementation, safety, stability, low manufacturing cost, wide application range and the like.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without creatively designing the similar structural modes and embodiments to the technical solutions, they should belong to the protection scope of the present invention.

Claims (10)

1. The utility model provides a sanding tool power take off end safety protection mechanism, is used for on locating organism (1) with power take off spare (4) of accessory (2) detachable connection that polishes, its characterized in that: the lower end of the power output part (4) is axially slidably provided with a protective cover (3), the protective cover (3) is provided with a through hole (3-2) for a connecting part at the lower part of the power output part (4) to pass through, an elastic part (5) is arranged between the protective cover (3) and the power output part (4), and the protective cover (3) has a first position and a second position relative to the power output part (4);

when the protective cover (3) is at the first position, the grinding accessory (2) is separated from the power output part (4), the protective cover (3) is positioned at the lower part of the power output part (4) under the action of the elastic part (5), so that the connecting part at the lower part of the power output part (4) is covered;

when protective cover (3) was in the second position, grinding annex (2) and power take off (4) combine together, protective cover (3) remove the upper portion to power take off (4) under grinding annex (2) effect, make the connecting portion of power take off (4) lower part stretch out and be connected with grinding annex (2).

2. The sanding tool power take-off safety protection mechanism of claim 1, wherein: the elastic element (5) is a pagoda spring.

3. The sanding tool power take-off safety protection mechanism of claim 1, wherein: the periphery of protective cover (3) still be equipped with the ascending circular dado of round, this circular dado can cover the connecting portion of power take off spare (4) lower part all around when protective cover (3) are in the primary importance.

4. An abrasive tool power take off safety protection mechanism as claimed in claim 1, 2 or 3, wherein: the inner side of the protective cover (3) is provided with a limiting buckle (3-1) which extends upwards, a buckle hole (4-3) corresponding to the position of the limiting buckle (3-1) is formed in the power output part (4), the limiting buckle (3-1) extends into the corresponding buckle hole (4-3), the limiting buckle (3-1) can axially move in the buckle hole (4-3), and the limiting buckle (3-1) is limited by a clasp at the top of the limiting buckle (3-1) and the outer edge of the buckle hole (4-3).

5. The utility model provides an electric sander, includes organism (1) and grinding attachment (2), organism (1) on be equipped with power take off (4) that are used for connecting grinding attachment (2), grinding attachment (2) and power take off (4) adopt quick change mechanism detachable connection, its characterized in that: the electric sander has the safety protection mechanism for the power output end of the sanding tool as set forth in any one of claims 1 to 4.

6. An electric sanding machine according to claim 5, characterized in that: quick change mechanism including locating locking piece (2-1) on the annex (2) of polishing and pothook (4-1) of locating power take off (4) lower part, locking piece (2-1) on be equipped with through rotating locking piece (2-1) and with pothook (4-1) lock on power take off (4) or break away from the buckling part of unblock, the one end of locking piece (2-1) still be equipped with the handle, protective cover (3) on be equipped with through-hole (3-2) that supply pothook (4-1) to pass.

7. The electric sander as set forth in claim 6, wherein: the lower part of power take off spare (4) still be equipped with reference column (4-2), grinding annex (2) on be equipped with the position with above-mentioned reference column (4-2) corresponding locating hole (2-2), protective cover (3) on still be equipped with through-hole (3-2) that supply reference column (4-2) to pass.

8. An electric sanding machine according to claim 5, 6 or 7, characterized in that: the grinding accessory (2) is a triangular bottom plate or a circular bottom plate or a rectangular bottom plate.

9. The electric sander as set forth in claim 8, wherein: the machine body (1) is internally provided with a driving motor, an eccentric shaft (1-3) is fixed on a motor shaft (1-1) of the driving motor, a bearing frame (6) is installed on the eccentric shaft (1-3) through a bearing (1-5), the power output part (4) is fixed on the bearing frame (6), and the eccentric shaft (1-3) rotates to drive the power output part (4) to do random orbital motion or revolution orbital motion.

10. The electric sander as set forth in claim 9, wherein: the motor shaft (1-1) is further provided with a fan (1-2), the eccentric shaft (1-3) is fixedly connected with the motor shaft (1-1) through a locking bolt (1-4) screwed on the motor shaft (1-1), and the power output part (4) is fixed on the lower part of the bearing frame (6) through a screw.

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