CN212553187U - Electric tool - Google Patents

Abstract

The application provides an electric tool, including casing, motor, reducing gear box, output shaft, cutter, safety cover subassembly and spacing portion. Through set up spacing portion on the end cover of reduction box can inject the safety cover body and wind rotation range when the output shaft rotates, wherein, along cutter direction of rotation, the safety cover body winds when the output shaft rotates the biggest angle, its border with the contained angle that the axis of casing formed is 140-160, can prevent the opening of safety cover body towards the operator like this reliably to prevent that the powder that electric tool produced in the course of the work from flying to the operator, and even the cracked scattering of emery wheel piece and collision safety cover body in the use, make its safety cover body along the circumstances of cutter direction of rotation removal, also can make safety cover body rotation angle in certain within range, improve its product safety in utilization.

Description

Electric tool

Technical Field

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

Background

The angle grinder product has wide application in various industries of national production, the structure of the angle grinder product is a cylindrical machine body, the machine body can be used as a handle to be held, and a motor is arranged in the machine body. The front part of the machine body is provided with a reduction gearbox, the reduction gearbox enables the rotation output of the motor to be output in the direction vertical to the motor shaft after reducing the speed through a bevel gear set, and a clamping device is arranged on an output shaft and clamps the grinding wheel. The grinding wheel generates high-speed rotation motion to remove redundant materials, in order to prevent particles generated in the process of removing the redundant materials or fragments generated when the grinding wheel is broken from flying to an operator, a grinding wheel protective cover is arranged on the side, facing the operator, of the grinding wheel approximately in the half circle, a circular mounting part is arranged on the grinding wheel cover, a bolt is arranged on the circular mounting part, a reduction box is correspondingly provided with a circular convex part which is matched with the circular part of the grinding wheel cover, in addition, the grinding wheel cover can be disassembled for convenient replacement and use of the grinding wheel, in addition, in order to enable the operator to have better operation posture for operation, the covering range can be adjusted at any angle along the circumference relative to an output shaft, after the orientation angle of the grinding wheel cover is adjusted, the bolt can be screwed to be fixed, and the opening direction of the grinding wheel cover is back to the operator generally, however, when an operator fails to open the grinding wheel cover to a larger angle towards the operator side in the rotation direction of the grinding wheel, particles generated in the rotation direction during grinding or even fragments generated when the grinding wheel is broken fly towards the operator, the angle of adjusting the grinding wheel cover to any position is not favorable for the safety protection of the operator, in addition, even after the initial adjustment is carried out to an angle away from the operator, if the bolt is not screwed tightly, the grinding wheel cover may also collide against a workpiece or fragments generated when the grinding wheel is broken to drive the grinding wheel cover to deflect the angle, so that the opening angle faces the direction unfavorable for operation, and safety accidents may be caused, in order to reliably avoid the above conditions, the maximum opening facing angle of the grinding wheel cover needs to be limited, and many domestic angle grinding products circulating on the market do not have special structural measures in the aspect, has great potential safety hazard.

Disclosure of Invention

The invention aims to provide an electric tool, which solves the technical problem that the protective cover of the existing electric tool can not reliably prevent the opening from facing an operator.

To achieve the above object, the present application provides an electric power tool including:

a housing;

a motor disposed within the housing;

the reduction box is connected with the motor; the reduction gearbox comprises a reduction gearbox body and a reduction gear part, and the reduction gear part is arranged in the reduction gearbox body;

an output shaft connected to the reduction gear portion and protruding from the gear housing, the reduction gear portion driving the output shaft;

the cutter is connected with the output shaft, and the output shaft drives the cutter to work;

the protective cover assembly comprises a hoop and a protective cover body, and the protective cover body is connected with the hoop; the clamp is connected with the reduction box body, so that the protective cover body covers the periphery of the cutter and covers part of the cutter; the clamp can rotate around the output shaft, so that the coverage of the protective cover body on the periphery of the cutter can be changed;

the limiting part is arranged on the reduction box body and used for limiting the rotating range of the protective cover body when the protective cover body rotates around the output shaft; and when the protective cover body rotates around the output shaft by the maximum angle along the rotation direction of the cutter, the boundary of the protective cover body and the axis of the shell form an included angle A of 140-160 degrees.

Optionally, in the electric tool, a groove is formed in the reduction box, the clamp is provided with a protruding portion protruding towards an axis of the clamp, and the protruding portion is arranged in the groove and can move along the groove; and when the lug boss moves to the limiting part along the rotation direction of the cutter, the limiting part limits the movement of the lug boss.

Optionally, in the electric tool, the groove is an o-shaped groove arranged along the circumferential direction of an end cover of the reduction box body; and a limit groove is arranged in the axial direction of the end cover of the reduction box body, a limit sheet is arranged in the limit groove, and one surface of the limit sheet facing the clamp is protruded out of the bottom surface of the o-shaped groove to form the limit part.

Optionally, in the electric power tool, the groove is a "c" shaped groove disposed along a circumferential direction of an end cover of the reduction box body, and two ends of the c "shaped groove are not connected to form the limiting portion.

Optionally, in the electric power tool, an opening is formed in the clamp, a clamping hole is formed in an end portion of the opening, and the two clamping holes are connected through bolts so that the clamp is clamped on an end face of the reduction box body.

Optionally, in the electric power tool, the clamp and an end surface of the reduction box body are provided with anti-slip pads.

Optionally, in the power tool, the power tool is an angle grinder.

Compared with the prior art, the electric tool that this application provided, through set up spacing portion on the end cover of reduction box can inject the safety cover body winds rotation range when the output shaft rotates, wherein, follows cutter direction of rotation, the winding of safety cover body when the output shaft rotates the maximum angle, its border with the contained angle that the axis of casing formed is 140-160, can prevent the opening of safety cover body towards the operator like this reliably to prevent that the powder that electric tool produced in the course of the work from flying to the operator, and even the broken safety cover body that scatters and collide of grinding wheel piece in the use, make under the condition that its safety cover body removed along cutter direction of rotation, also can make safety cover body rotation angle in certain within range, improve its product safety in utilization.

Drawings

Fig. 1 is an assembly view of a power tool according to an embodiment of the present application;

fig. 2 is a partial cross-sectional view of a power tool provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of an electric tool provided in an embodiment of the present application;

fig. 4 is an assembly view of a power tool according to another embodiment of the present application.

Wherein the reference numerals of figures 1 to 4 are as follows:

10-a housing; 20-reduction box body; 21-a groove; 22-a threaded hole; 23- "C" shaped groove; 30-an output shaft; 40-a cutter; 50-a protective cover assembly; 51-a protective cover body; 52-a clamp; 52 a-boss; 52 b-open end; 60-a limiting part; 61-a limit groove; 62-a limiting sheet; 62 a-attachment hole; 70-pressing plate; 80-bolt; 90-screw.

Detailed Description

To make the objects, advantages and features of the present invention more clear, the following detailed description of the electric tool proposed by the present invention is made with reference to the accompanying drawings 1 to 4. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 to 3, the present application provides an electric tool including a housing 10, a motor (not shown), a reduction box, an output shaft 30, a cutter 40, a protection cover assembly 50, and a limiting portion 60. The motor is disposed within the housing 10. The reduction gearbox is connected with the motor; the reduction gearbox comprises a reduction gearbox body 20 and a reduction gear part, and the reduction gear part is arranged in the reduction gearbox body 20. The output shaft 30 is connected to the reduction gear part (not shown) and protrudes out of the gear box, the motor drives the reduction gear part to move, and the reduction gear part drives the output shaft 30. The cutter 40 is connected with the output shaft 30, and the output shaft 30 drives the cutter 40 to work. The protective cover assembly 50 comprises a clamp 52 and a protective cover body 51, the protective cover body 51 is connected with the clamp 52, the clamp 52 is connected with the reduction box body 20, so that the protective cover body 51 covers the periphery of the cutter 40 and covers part of the cutter 40; the clip 52 can rotate around the output shaft 30, so that the coverage of the protective cover body 51 to the periphery of the cutter 40 can be changed. The stopper 60 is provided on the reduction case 20, and is used to limit a rotation range of the guard cover body 51 when rotating around the output shaft 30; in the rotating direction D of the cutter 40, when the protective cover body 51 rotates around the output shaft 30 by a maximum angle, the boundary thereof forms an included angle a of 140 ° to 160 ° with the axis G of the housing 10. For example 160 °, 150 °, 140 °.

The end cover of the reduction box 20 is provided with the limiting part 60 to limit the rotation range of the protective cover body 51 when the protective cover body 51 rotates around the output shaft 30, wherein, when the protective cover body 51 rotates around the output shaft 30 by the maximum angle along the rotation direction D of the cutter 40, the boundary of the end cover of the reduction box 20 forms an included angle A of 140-160 degrees with the axis of the shell 10, thus the opening of the protective cover body 51 can be reliably prevented from facing an operator, thereby preventing powder particles generated in the working process of the electric tool from flying to the operator, and even if the grinding wheel is broken and scattered to collide with the protective cover body 51 during the use process, so that the protective cover body 51 moves along the rotation direction of the cutter 40, the rotation angle of the protective cover body 51 can be within a certain range, and the use safety of the product is improved.

Wherein, clamp 52 with protection cover body 51 formula structure as an organic whole, like protection cover body 51 with clamp 52 can not carry out relative slip, and is further cutter 40 can produce the fragment impact force when powder or cutter 40 are broken at the process of high-speed operation work or protection cover body 51 can overcome with the inconsistent power of work piece clamp 52 is right the chucking power of the end cover of reduction box 20 makes protection cover subassembly 50 is followed cutter 40 direction of rotation D rotates, at this moment protection cover body 51 with clamp 52's relative position is absolute, further assurance protection cover body 51 is to operator's guard action.

The reduction box body 20 is provided with a groove 21, specifically, the groove 21 is arranged on an end cover of the reduction box body 20, the clamp 52 is provided with a convex part 52a protruding towards the axis of the clamp, and the convex part 52a is arranged in the groove 21 and can move along the groove 21; and when the boss portion 52a moves to the stopper portion 60 in the rotation direction D of the cutter 40, the stopper portion 60 restricts the movement thereof. The recess 21 limits the degree of freedom of the projection 52a in the axial direction of the output shaft 30 so that the guard cover assembly 50 does not move on the reduction case 20 in the axial direction of the output shaft 30.

Specifically, the groove 21 is an o-shaped groove formed along the circumferential direction of the end cover of the reduction gear box 20. A stopper groove 61 is formed in the end cover of the reduction case 20 in the axial direction, a stopper piece 62 is provided in the stopper groove 61, and one surface of the stopper piece 62 facing the yoke 52 protrudes from the bottom surface of the o-shaped groove to form the stopper portion 60. The limiting sheet 62 is fixedly connected with the reduction box body 20, the specific structure is as shown in fig. 1, the limiting sheet 62 is L-shaped, a connecting hole 62a is formed in the bottom of the limiting sheet 62, and the connecting hole 62a is used for being connected with an original threaded hole 22 in the reduction box body 20 through a screw 90, so that the cost can be saved. Of course, the connection hole 62a may also be connected to a new threaded hole formed in the reduction case 20 by a screw.

The clamp 52 is provided with an opening, a clamping hole is formed in the end portion 52b of the opening, and the two clamping holes are connected through a bolt 80 so that the clamp 52 can be clamped on the end face of the reduction box body 20. The end surfaces of the yoke 52 and the reduction case 20 are provided with anti-slip pads (not shown), which can further limit the rotation range of the protective cover body 51.

The following description will be made of the assembly relationship and the working process of each structure by taking an angle grinder as an example, and the cutting tool 40 is a grinding wheel. The speed reduction gear part (not shown in the figure) comprises a first gear and a second gear, the first gear is connected with a spindle of the motor and can rotate around an axis G of the first gear, the second gear 18 is connected with the output shaft 30, the second gear and the output shaft 30 both rotate around the axis, a pressure plate 70 is arranged at the end part of the output shaft 30 and clamps the grinding wheel piece on the output shaft 30 to rotate around the output shaft, an end cover of the speed reduction box body 20 is a cylinder, an 'o' -shaped groove is formed in the side surface of the cylinder, a bulge 52a facing the output shaft 30 is arranged on a clamp 52 of the protection cover assembly 50, and the bulge 52a is matched with the 'o' -shaped groove to prevent the protection cover body 51 from moving axially along the output shaft 30. The clamp 52 has an opening, a clamping hole is provided at an end portion 52b of the opening, and the two clamping holes are connected by a bolt 80 to clamp the clamp 52 to the end surface of the reduction gear box 20, and the bolt 80 is tightened to fasten the protective cover body 51 to the end cover of the reduction gear box 20 after the protective cover body 51 is adjusted to a desired angle because the protective cover body 51 and the clamp 52 are of an integral structure.

After the grinding wheel is installed, part of the grinding wheel is surrounded and covered by the protective cover body 51, the protective cover body 51 rotates around the output shaft 30 along the rotation direction D of the grinding wheel due to the impact force of grinding wheel fragments possibly generated during work or the collision between the cover body and a workpiece during operation, the limiting part 60 is arranged on the end cover of the reduction box body 20, the protruding part 52a on the hoop 52 abuts against the limiting part 60 when the protruding part rotates to a certain angle, the included angle A formed by the boundary of the protective cover body 51 and the axis G of the shell 10 after the protective cover body rotates to the maximum angle is 140-160 degrees, the protective cover body 51 is reliably prevented from continuing to rotate towards the rotation direction D of the grinding wheel, and therefore the position adjustment range of the protective cover body 51 is.

By limiting the rotation angle range of the protective cover body 51, the situation that the opening angle of an operator along the grinding wheel rotating direction D is too large is avoided, particles generated in the grinding process are prevented from flying to the operator, and even if the grinding wheel is broken and scattered to collide with the protective cover body 51 in the using process, the protective cover body 51 moves along the grinding wheel rotating direction, the rotation angle of the protective cover body 51 can be enabled to be within a certain range, the protruding portion 52a on the clamp 52 is abutted against the limiting piece 62, the grinding wheel fragments are prevented from flying to the operator, and the use safety of the product is improved.

Referring to fig. 4, in conjunction with fig. 2-3. In another embodiment, the groove 21 is a "c" shaped groove 23 disposed along the circumferential direction of the end cover of the reduction box 20, and two ends of the c "shaped groove are not connected to form the limiting portion 60, i.e., the ends and the tails of the c" shaped groove are not connected to form the limiting portion 60. Thus, the limiting part 60 and the end cover of the reduction box body 20 are integrated into a whole, so that the firmness of the limiting part 60 is greatly improved, and the service life of the limiting part is greatly prolonged.

Further, the above example is applicable not only to a small-sized angle grinder having a rear cover type handle function but also to a large-sized angle grinder having a special handle.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (7)

1. An electric power tool, characterized by comprising:

a housing;

a motor disposed within the housing;

the reduction box is connected with the motor; the reduction gearbox comprises a reduction gearbox body and a reduction gear part, and the reduction gear part is arranged in the reduction gearbox body;

an output shaft connected to the reduction gear portion and protruding from the reduction case, the reduction gear portion driving the output shaft;

the cutter is connected with the output shaft, and the output shaft drives the cutter to work;

the protective cover assembly comprises a hoop and a protective cover body, and the protective cover body is connected with the hoop; the clamp is connected with the reduction box body, so that the protective cover body covers the periphery of the cutter and covers part of the cutter; the clamp can rotate around the output shaft, so that the coverage of the protective cover body on the periphery of the cutter can be changed;

the limiting part is arranged on the reduction box body and used for limiting the rotating range of the protective cover body when the protective cover body rotates around the output shaft; when the protective cover body rotates around the output shaft by the maximum angle along the rotation direction of the cutter, the included angle formed by the boundary of the protective cover body and the axis of the shell of the end cover of the reduction box body is 140-160 degrees.

2. The power tool as claimed in claim 1, wherein the reduction case is provided with a recess, the yoke is provided with a projection projecting toward an axis thereof, and the projection is disposed in the recess so as to be movable along the recess; and when the lug boss moves to the limiting part along the rotation direction of the cutter, the limiting part limits the movement of the lug boss.

3. The power tool of claim 2, wherein the recess is an "o" shaped groove provided circumferentially along an end cover of the reduction case; and a limit groove is arranged in the axial direction of the end cover of the reduction box body, a limit sheet is arranged in the limit groove, and one surface of the limit sheet facing the clamp is protruded out of the bottom surface of the o-shaped groove to form the limit part.

4. The electric tool according to claim 2, wherein the recess is a "c" -shaped groove provided along a circumferential direction of an end cover of the reduction case, and both ends of the c "-shaped groove are not connected to form the stopper portion.

5. The power tool as claimed in claim 1, wherein the yoke has an opening, and a clamping hole is provided in an end portion of the opening, and the two clamping holes are connected by a bolt to clamp the yoke to an end surface of the reduction case.

6. The power tool of claim 1, wherein the clamp and the end surface of the reduction case are provided with anti-slip pads.

7. The power tool of claim 1, wherein the power tool is an angle grinder.

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