CN113172522B

CN113172522B - Angle grinder

Info

Publication number: CN113172522B
Application number: CN202110393288.3A
Authority: CN
Inventors: 刘强
Original assignee: Youwei Technology Suzhou Co ltd
Current assignee: Youwei Technology Suzhou Co ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2023-03-24
Anticipated expiration: 2041-04-13
Also published as: CN113172522A

Abstract

The invention discloses an angle grinder which comprises an angle grinder body and an auxiliary handle arranged at the front end of the angle grinder body, wherein the auxiliary handle is determined to be provided with a central axis, the auxiliary handle rotates around the central axis and generates a linear adjusting signal to be transmitted to a main control unit of the angle grinder body, and the main control unit drives the rotating speed of a motor of the angle grinder to change linearly according to the received linear adjusting signal. The invention can linearly adjust the speed while the angle grinder works, thereby improving the working efficiency and improving the user experience.

Description

Angle grinder

Technical Field

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

Background

An angle grinder is a machine for grinding, removing rust, and polishing metal members by using a thin grinding wheel or the like rotating at a high speed, is suitable for brushing metal and stone, does not use water during the work, and can perform grinding and polishing work if appropriate accessories are attached to the machine in a machine type equipped with an electronic control device.

The existing angle grinder generally adopts a mode of arranging a speed regulating mechanism on a main handle to regulate the speed of the angle grinder. As shown in fig. 1, the angle grinder includes a display interface 1 disposed at the end of a main handle, the display interface includes four display units 11 and a speed-regulating mechanism 12 distributed in a row, the speed-regulating mechanism 12 is configured to be manipulated to wake up the display interface 1 when the display interface 1 is in a screen-off state, and to be manipulated to adjust the gear of the angle grinder when the display interface 1 is in a wake-up state, so as to change the rotation speed of an output shaft. Because the speed regulating mechanism is arranged at the tail end of the main handle, when the angle grinder is used, the speed regulating mechanism is positioned behind the position of holding the main handle by hand, one hand cannot drive the speed regulating mechanism while driving the switch of the angle grinder, and further cannot realize the speed regulation of the angle grinder in the running state. In fact, the speed regulation mechanism of the angle grinder in the above patent is pre-speed regulation, that is, the speed regulation is required before the angle grinder works or in a pause interval, which affects the continuity of the work of the angle grinder, resulting in low working efficiency and poor user experience.

Disclosure of Invention

The invention aims to provide an angle grinder which can linearly adjust the speed while the angle grinder works, so that the working efficiency is improved, and the user experience is improved.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: an angle grinder comprises an angle grinder body and an auxiliary handle arranged at the front end of the angle grinder body, wherein the auxiliary handle is determined to have a central axis, the auxiliary handle rotates around the central axis and generates a linear adjusting signal to be transmitted to a main control unit of the angle grinder body, and the main control unit drives the rotating speed of a motor of the angle grinder to change linearly according to the received linear adjusting signal.

In the technical scheme, the auxiliary handle comprises a static part fixed on the angle grinder body and a movable part rotating around a central axis relative to the static part, and the movable part and the static part rotate relatively to generate a linear adjusting signal.

In the technical scheme, the stationary part is provided with the linear hall sensor, the movable part is provided with the magnet, the signal output end of the linear hall sensor is electrically connected to the main control unit, the magnet rotates along with the movable part, and the projection of the linear hall sensor on the plane formed by the rotation of the magnet falls on the rotation track of the magnet.

In the technical scheme, the static part comprises a rotating disc, a first connecting part which is arranged on one side of the rotating disc and is fixedly connected with the angle grinder body, and a second connecting part which is arranged on the other side of the rotating disc and is internally provided with a first cylindrical cavity, and the linear Hall sensor is arranged on the surface of one side of the rotating disc, which corresponds to the second connecting part;

the movable part comprises a neck part for accommodating the rotating disc and a holding part extending from one side of the neck part to one side far away from the angle grinder body, a second cylindrical cavity is formed in the holding part, and a cylindrical pin body extending from one side far away from the neck part to one side close to the neck part is arranged in the second cylindrical cavity;

when the movable part is matched and connected with the static part, the cylindrical pin body is embedded into the first cylindrical cavity, the rotating disc is positioned in the neck part, a first return spring is arranged between the second connecting part and the cylindrical pin body, and the first return spring provides restoring force for returning the movable part to the initial rotating position.

In the above technical scheme, an external thread is arranged on the outer surface of the first connecting part.

In the technical scheme, a plurality of limiting grooves are formed inwards at the opening of the neck, the limiting grooves are circumferentially distributed on the inner side edge of the opening of the neck at equal intervals, and the plane where each limiting groove is located is perpendicular to the central axis of the auxiliary handle;

a plurality of limiting blocks corresponding to the limiting grooves are formed at the edge of the rotating disc, and the limiting blocks are matched with the limiting grooves for limiting;

the movable part reciprocates along the central axis direction of the auxiliary handle to switch the rotating disc between a first position and a second position in the neck part;

when the rotating disc is positioned at the first position, the movable part is allowed to rotate relative to the static part; when the rotating disc is located at the second position, the limiting block is matched with the limiting groove to prevent the movable portion from rotating relative to the static portion.

In the above technical scheme, a third connecting portion extending to the cylindrical pin body is formed in the first cylindrical cavity of the movable portion, a through hole for the third connecting portion to pass through is formed in the end portion of the cylindrical pin body, a second return spring is sleeved on the third connecting portion, and the second return spring provides restoring force for enabling the rotating disc to be switched from the first position to the second position.

In the above technical scheme, a third cylindrical cavity is formed in the cylindrical pin body, and a limiting bolt for preventing the third connecting portion from slipping off the cylindrical pin body is arranged on the end portion of the third connecting portion, which is located in the third cylindrical cavity.

In the above technical solution, a cover for closing the third cylindrical cavity is detachably disposed on a side of the cylindrical pin body away from the third connecting portion.

Among the above-mentioned technical scheme, the edge of lid is provided with a plurality of buckles at the equidistant, the opening edge of the cylindrical cavity of third is provided with the bayonet socket that corresponds the buckle, the lid is through the cooperation joint of buckle and bayonet socket to the terminal surface of keeping away from neck one side of the portion of gripping.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. the invention can realize linear adjustment of the rotating speed of the angle grinder by rotating the auxiliary handle, and has simple and convenient operation and good user experience;

2. the invention can prevent the auxiliary handle from being operated by mistake.

Drawings

FIG. 1 is a schematic view of the structure of the angle grinder of the present invention.

Fig. 2 is a schematic view of the sub-handle of the present invention in a locked state.

Fig. 3 is a schematic view of the positional relationship between the linear hall sensor and the magnet when the sub-handle of the present invention is in the locked state.

Fig. 4 is a schematic view of the sub-handle of the present invention in a rotated state.

Fig. 5 is a schematic view showing a positional relationship between the linear hall sensor and the magnet when the sub-handle of the present invention is in a rotated state.

Fig. 6 is a schematic view of the engagement between the limiting groove and the limiting block.

Fig. 7 is a block diagram of the speed control circuit of the present invention.

Wherein: 1. an angle grinder body; 2. an auxiliary handle; 21. a stationary portion; 211. a linear hall sensor; 212. rotating the disc; 2121. a limiting block; 213. a first connection portion; 214. a first cylindrical cavity; 2141. a third connecting portion; 21411. a limit bolt; 215. a second connecting portion; 2151. a support rib; 216. a channel; 22. a movable portion; 221. a magnet; 222. a neck portion; 2221. a limiting groove; 223. a grip portion; 224. a second cylindrical cavity; 225. a cylindrical pin body; 2251. a through hole; 2252. a third cylindrical cavity; 22521. a bayonet; 2253. a cover; 22531. buckling; 23. a first return spring; 24. a second return spring.

Detailed Description

The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the present invention provides an angle grinder for cutting or grinding objects, which comprises an angle grinder body 1 and an auxiliary handle 2 arranged at the front end of the angle grinder body, wherein when a user uses the angle grinder, the user holds a main handle at the rear end of the angle grinder body 1 with one hand and holds the auxiliary handle 2 of the angle grinder with the other hand, so that the angle grinder is in a stable posture during operation. Specifically, the auxiliary handle 2 defines a central axis, the auxiliary handle 2 rotates around the central axis and generates a linear adjusting signal to be transmitted to the main control unit of the angle grinder body 1, and the main control unit drives the rotation speed of the motor of the angle grinder to change linearly according to the received linear adjusting signal.

Specifically, the sub-handle 2 includes a stationary portion 21 fixed to the angle grinder body 1 and a movable portion 22 rotating about a central axis with respect to the stationary portion 21, and the movable portion 22 rotates relative to the stationary portion 21 to generate a linear adjustment signal. With the sub-handle 2 of this structure, it can be seen that the rotation of the sub-handle 2 of the present invention is actually the rotation of the movable portion 22. Specifically, the user achieves linear acceleration of the motor of the angle grinder by rotating the movable portion 22 of the sub-handle 2.

More specifically, as shown in fig. 2 to 5, a linear hall sensor 211 is disposed on the stationary portion 21, a magnet 221 is disposed on the movable portion 22, a signal output end of the linear hall sensor 211 is electrically connected to the main control unit, the magnet 221 rotates along with the movable portion 22, and a projection of the linear hall sensor 211 on a plane formed by the rotation of the magnet 221 falls on a rotation track of the magnet 221. As known to those skilled in the art, the linear hall sensor 211 comprises a hall element, a linear amplifier and an emitter follower, and the output voltage thereof is proportional to the intensity of the magnetic field passing through itself, and the output voltage thereof rises or falls according to the characteristics and intensity of the magnetic field, and the detailed structure of the linear hall sensor 211 is not described herein. In a specific operation, when the movable part 22 is at the initial rotation position, the projection of the linear hall sensor 211 on the plane formed by the rotation of the magnet 221 is farthest away from the magnet 221; when the movable portion 22 is at the rotation end position, the projection of the linear hall sensor 211 on the plane formed by the rotation of the magnet 221 overlaps the magnet 221.

In order to realize the relative rotation of the movable part 22 and the stationary part 21, the stationary part 21 comprises a rotating disc 212, a first connecting part 213 which is arranged on one side of the rotating disc 212 and fixedly connected with the angle grinder body 1, and a second connecting part 215 which is arranged on the other side of the rotating disc 212 and is internally provided with a first cylindrical cavity 214, the linear hall sensor 211 is arranged on one side surface of the rotating disc 212 corresponding to the second connecting part 215, in order to realize the signal transmission of the linear hall sensor 211 and the main control unit, a channel 216 which penetrates through the rotating disc 212 and the first connecting part 213 is arranged in the center of the rotating disc 212 and the inside of the first connecting part 213, and the signal transmission line of the linear hall sensor 211 is electrically connected to the main control unit after passing through the channel 216;

the movable portion 22 comprises a neck portion 222 for accommodating the rotating disc 212 and a holding portion 223 extending from one side of the neck portion 222 to the side far away from the angle grinder body 1, a second cylindrical cavity 224 is formed in the holding portion 223, a cylindrical pin body 225 extending from one side far away from the neck portion 222 to one side close to the neck portion 222 is arranged in the second cylindrical cavity 224, and the inner diameter of the neck portion 222 is larger than the inner diameter of the rotating disc 212 (i.e. the diameter of the second cylindrical cavity 224), so that the movable area of the rotating disc 212 is limited in the neck portion 222;

when the movable portion 22 is coupled to the stationary portion 21, the cylindrical pin 225 is inserted into the first cylindrical cavity 214, the rotating disk 212 is located in the neck portion 222, a first return spring 23 is disposed between the second connecting portion 215 and the cylindrical pin 225, the first return spring 23 provides a restoring force for returning the movable portion 22 to the initial position of rotation, and specifically, the first return spring 23 is a torsion spring with one end fixed to an outer wall of the second connecting portion 215 and the other end fixed to an inner wall of the holding portion 223;

in order to prevent the unstable operation of the sub-handle 2 caused by the shaking of the second connecting part 215 of the stationary part 21 in the second cylindrical cavity 224 of the movable part 22, a plurality of support ribs 2151 interposed between the outer wall of the second connecting part 215 and the inner wall of the grip 223 are formed on the outer wall of the second connecting part 215, and the gap between the outer wall of the second connecting part 215 and the inner wall of the grip 223 can be reduced by providing the support ribs 2151, thereby improving the operation stability of the sub-handle 2 and improving the user experience and the use safety.

Conventionally, an external thread is provided on an outer surface of the first connection portion 213; in fact, to meet the routing requirement of the signal transmission line of the linear hall sensor 211, the first connection portion 213 is a hollow bolt; correspondingly, the angle grinder body 1 is provided with a mounting hole with an internal thread, and the first connecting part 213 is fixed to the angle grinder body 1 through the threaded connection of the external thread and the internal thread, so that the auxiliary handle 2 is mounted on the angle grinder body 1, in particular on a metal head of the angle grinder. In order to further improve the safety of the angle grinder, and prevent the screw connection from being loosened by the speed regulation of the sub-handle 2, the screw structure needs to be configured to be tightened in the process of turning the movable portion 22 from the initial turning position to the final turning position.

In order to further improve the holding stability of the auxiliary handle 2 and prevent the misoperation, referring to fig. 6, a plurality of limiting grooves 2221 are formed inwards at the opening of the neck portion 222, the limiting grooves 2221 are circumferentially distributed at equal intervals on the inner side edge of the opening of the neck portion 222, and the plane where each limiting groove 2221 is located is perpendicular to the central axis of the auxiliary handle 2;

the edge of the rotating disk 212 forms a plurality of limiting blocks 2121 corresponding to the limiting grooves 2221, and the limiting blocks 2121 are matched with the limiting grooves 2221 for limiting;

the movable portion 22 reciprocates in the direction of the central axis of the sub-handle 2 to switch the rotating disk 212 between the first position and the second position in the neck portion 222;

when the rotating disc 212 is in the first position, the movable part 22 is allowed to rotate relative to the stationary part 21; when the rotating disc 212 is located at the second position, the limiting block 2121 cooperates with the limiting groove 2221 to prevent the movable portion 22 from rotating relative to the stationary portion 21.

Specifically, in this embodiment, each of the limiting grooves 2221 and the limiting blocks 2121 is selected to be 3, and during operation, the movable portion 22 is pushed towards one side of the angle grinder body 1, so that the limiting blocks 2121 are separated from the limiting grooves 2221 relatively, and the movable portion 22 is allowed to rotate relative to the stationary portion 21, so as to adjust the rotating speed.

More specifically, a third connecting portion 2141 extending toward the cylindrical pin body 225 is formed in the first cylindrical cavity 214 of the movable portion 22, a through hole 2251 is formed at an end of the cylindrical pin body 225, the third connecting portion 2141 is sleeved with a second return spring 24, and the second return spring 24 provides a restoring force for switching the rotating disk 212 from the first position to the second position. By arranging the second return spring 24, the position of the limiting block 2121 and the limiting groove 2221 can be restored to the matched limiting position after the speed regulation is completed.

Wherein, a third cylindrical cavity 2252 is formed in the cylindrical pin 225, and a limit bolt 21411 for preventing the third connecting portion 2141 from slipping off the cylindrical pin 225 is disposed on an end of the third connecting portion 2141 located in the third cylindrical cavity 2252. During specific installation, the movable part 22 is sleeved on the stationary part 21, so that after the third connecting part 2141 penetrates through the through hole 2251 in the cylindrical pin body 225, the limiting bolt 21411 is screwed on the end part of the third connecting part 2141, the diameter of the limiting bolt 21411 is larger than the hole diameter of the through hole 2251, the movable part 22 and the stationary part 21 can be freely assembled and disassembled by arranging the limiting bolt 21411, the movable part 22 can be prevented from being separated from the stationary part 21 in the use and speed regulation processes of the angle grinder, and the use safety is improved.

To improve the sealing performance of third cylindrical cavity 2252, a cover 2253 for closing third cylindrical cavity 2252 is detachably provided on the side of cylindrical pin 225 remote from third connecting portion 2141.

Specifically, the edge of the cover 2253 is provided with a plurality of notches 22531 at equal intervals, the opening edge of the third cylindrical cavity 2252 is provided with notches 22521 corresponding to the notches 22531, and the cover 2253 is snapped onto the end surface of the grip 223 on the side away from the neck 222 via the engagement of the

notches

22531 and 22521. When mounting the cover 2253, the cover 2253 is simply pressed in after the catch 22531 and the catch 22521 have been aligned.

Referring to fig. 7, the speed regulation circuit of the present invention includes a linear hall sensor, an MCU micro control unit, an optical coupling isolation driving module, a motor speed regulation module, a motor speed feedback module, a power supply circuit and a motor, where each component is supplied with power by the power supply circuit, and may adopt ac input or battery pack dc input. Specifically, the signal output end of linear hall sensor is electrically connected to the signal input end of MCU little the control unit, the signal output end of MCU little the control unit is connected to the signal input end of motor speed governing module through opto-coupler isolation drive module electricity, the signal output end of motor speed governing module is electrically connected to the signal input end of motor and the signal input end of motor speed feedback module, the signal output end of motor speed feedback module is electrically connected to the signal output end of MCU little the control unit. The speed regulating circuit collects magnetic field data of the magnet through the linear Hall sensor and feeds the magnetic field data back to the MCU, the MCU controls the motor speed regulating module to realize motor speed regulation according to output signals of the linear Hall sensor, and the motor speed is constant through the motor speed feedback module.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The utility model provides an angle mill, includes angle mill body and sets up the vice handle at angle mill body front end, angle mill body is still including the main handle who is located the rear end, its characterized in that: the auxiliary handle is determined to have a central axis, the auxiliary handle rotates around the central axis and generates a linear adjusting signal to be transmitted to a main control unit of the angle grinder body, and the main control unit drives the rotating speed of a motor of the angle grinder to change linearly according to the received linear adjusting signal;

the auxiliary handle comprises a static part fixed on the angle grinder body and a movable part rotating around a central axis relative to the static part, and the movable part and the static part rotate relatively to generate a linear adjusting signal;

the linear Hall sensor is arranged on the static part, a magnet is arranged on the movable part, the signal output end of the linear Hall sensor is electrically connected to the main control unit, the magnet rotates along with the movable part, the projection of the linear Hall sensor on a plane formed by the rotation of the magnet falls on the rotation track of the magnet, and the linear Hall sensor is positioned in a space enclosed by the static part and the movable part.

2. The angle grinder of claim 1, wherein: the static part comprises a rotating disc, a first connecting part which is arranged on one side of the rotating disc and is fixedly connected with the angle grinder body, and a second connecting part which is arranged on the other side of the rotating disc and is internally provided with a first cylindrical cavity, and the linear Hall sensor is arranged on the surface of one side of the rotating disc, which corresponds to the second connecting part;

3. The angle grinder of claim 2, wherein:

and an external thread is arranged on the outer surface of the first connecting part.

4. The angle grinder of claim 2, wherein:

a plurality of limiting grooves are formed inwards at the opening of the neck, the limiting grooves are circumferentially distributed on the inner side edge of the opening of the neck at equal intervals, and the plane of each limiting groove is perpendicular to the central axis of the auxiliary handle;

when the rotating disc is positioned at the first position, the movable part is allowed to rotate relative to the static part; when the rotating disc is located at the second position, the limiting block is matched with the limiting groove to prevent the movable part from rotating relative to the static part.

5. The angle grinder of claim 4, wherein:

a third connecting portion extending towards the cylindrical pin body is formed in the first cylindrical cavity of the movable portion, a through hole for the third connecting portion to pass through is formed in the end portion of the cylindrical pin body, a second return spring is sleeved on the third connecting portion, and the second return spring provides restoring force for enabling the rotating disc to be switched from the first position to the second position.

6. The angle grinder of claim 5, wherein:

and a third cylindrical cavity is formed in the cylindrical pin body, and a limiting bolt for preventing the third connecting part from slipping off the cylindrical pin body is arranged on the end part of the third connecting part, which is positioned in the third cylindrical cavity.

7. The angle grinder of claim 6, wherein:

and a cover used for sealing the third cylindrical cavity is arranged on one side of the cylindrical pin body, which is far away from the third connecting part, in a freely detachable mode.

8. The angle grinder of claim 7, wherein:

the edge of lid is provided with a plurality of buckles at the equidistant, the opening edge of the cylindrical cavity of third is provided with the bayonet socket that corresponds the buckle, the lid is through the cooperation joint of buckle and bayonet socket to the terminal surface of the neck one side of keeping away from of the portion of gripping on.