CN112548851A

CN112548851A - Mechanical power-off protection mechanism and angle grinder with same

Info

Publication number: CN112548851A
Application number: CN202011394977.8A
Authority: CN
Inventors: 徐靖洲
Original assignee: Individual
Current assignee: Ningbo Chitu Technology Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-03-26
Anticipated expiration: 2040-12-03
Also published as: CN112548851B

Abstract

The invention relates to a mechanical power-off protection mechanism and an angle grinder with the same, and the mechanical power-off protection mechanism comprises a microswitch, a toggle switch, a slide rail and a contact switch, wherein one end of the contact switch is connected with the toggle switch, the other end of the contact switch is provided with a pull rod which extends downwards to form a hook part, a detection sheet is connected in the slide rail in a sliding way, one end of the detection sheet is matched and abutted with a battery, and the contact switch can move and is close to the microswitch when the battery is installed; after the battery is arranged on the detection piece, the first reset spring for driving the detection piece to reset is arranged, one end, close to the micro switch, of the detection piece is provided with a bidirectional torsion spring and a limiting boss in limiting fit with the bidirectional torsion spring, one end, close to the micro switch, of the detection piece is further rotatably provided with a moving piece, the detection piece is further respectively provided with a first limiting table and a second limiting table, and a fan-shaped rotating area of the moving piece is formed between the first limiting table and the second limiting table. The invention has the advantages of low cost and better safety.

Description

Mechanical power-off protection mechanism and angle grinder with same

Technical Field

The invention relates to the technical field of angle grinders, in particular to a mechanical power-off protection mechanism and an angle grinder with the same.

Background

An angle grinder (anglegnder), also called as a grinder or a disc grinder, is a hand-held electric tool for cutting and grinding by using glass fiber reinforced plastics, is mainly used for cutting, grinding and brushing metal and stone materials, cannot use water during operation, and carries out grinding, cutting, derusting and polishing processing on metal components by using a sheet grinding wheel, a rubber grinding wheel, a steel wire wheel and the like which rotate at a high speed.

The angle grinder is an electrical appliance because a motor is required to be arranged inside the angle grinder, and the angle grinder is usually operated by the following steps: firstly, a power supply is plugged in, then the switch is turned on, the switch is turned off after the use is finished, and finally the power supply is pulled out. However, in order to improve the working efficiency, the worker often pulls out the power plug without turning off the switch, so that the machine is forcibly turned off, and therefore, when the machine is used for the second time, the power angle grinder can be automatically started after being plugged in due to the fact that the switch is not turned off, and the machine is very dangerous.

In summary, as for the angle grinder as an electrical device, how to ensure the safety of the power consumption of the angle grinder in the using process is very important, the power supply of the angle grinder is generally 220V, which exceeds the application range of human body, once the power consumption is improper, the electric shock phenomenon is easy to occur, therefore, in order to make the power consumption safer, the angle grinder is internally provided with a power-off protection function, the current power-off protection function is realized by an internal power-off detection circuit, and the internal power-off detection circuit is utilized to have the following problems: 1. because the internal power-off detection circuit comprises a plurality of electronic components which belong to quick-wear parts, the situation that power cannot be off easily occurs under the condition that the electronic components are damaged, the safety is damaged, and the power-off is not firm; 2. electronic components need to be frequently replaced at the later stage, and the electronic components need to be disassembled and assembled, so that the electronic components are relatively troublesome; 3. the adopted components need to be combined with programming, the manufacturing is relatively complex, and the processing cost is high.

Disclosure of Invention

In view of the above, the present invention provides a mechanical power-off protection mechanism and an angle grinder having the same, which adopts mechanical power-off, and has low cost and reliable power-off.

In order to solve the technical problems, the technical scheme of the invention is as follows: a mechanical power-off protection mechanism comprises a microswitch, a toggle switch, a slide rail, a pull rod, a detection piece and a contact switch, wherein one end of the pull rod is connected with the toggle switch, the other end of the pull rod extends downwards to form a hook part, the detection piece is connected in the slide rail in a sliding mode and used for detecting whether a battery is installed, one end of the detection piece is matched and abutted with the battery, and the contact switch can move and is close to the microswitch when the battery is installed; a first reset spring for driving the detection piece to reset after the battery falls off is arranged on the detection piece, a bidirectional torsion spring and a limit boss in limit fit with the bidirectional torsion spring are arranged at one end of the detection piece close to the microswitch, two support legs of the bidirectional torsion spring are positioned at two sides of the limit boss and are propped against the limit boss, one end of the detection piece close to the microswitch is also rotatably provided with a movable piece which is positioned between the two support legs of the bidirectional torsion spring, the detection sheet is also provided with a first limit platform and a second limit platform respectively, a sector-shaped rotating area of the moving sheet is formed between the first limit platform and the second limit platform, the moving plate can abut against the end surface of the hook part to form a first critical point in the process of rotating towards the micro switch in the fan-shaped rotating area, the moving piece can abut against the end face of the hook part to form a second critical point in the rotating process of the fan-shaped rotating area towards the direction far away from the microswitch;

the toggle switch drives the hook part to reciprocate at the starting position and the shutdown position through the pull rod; when the hook part is in the power-off position, the moving plate can cross the second critical point in the battery installation process, and when the hook part moves from the power-off position to the power-on position under the state that the battery is installed, the hook part drives the moving plate to rotate relative to the detection plate, and when the hook part is in the power-on position, the moving plate triggers the contact switch;

when the hook part is positioned at a starting position and the battery falls off, the detection piece is far away from the microswitch, and the moving piece crosses the first critical point at the moment to reset the microswitch; when the hook part is in the starting position, if the battery is inserted again, the moving plate cannot cross the second critical point, the battery cannot be installed, and the micro switch cannot be started.

Preferably, one end of detecting the piece is provided with rotatory boss, the moving plate rotates to be connected on rotatory boss, the slide rail constitute by the first limiting plate that two upper and lower intervals set up, be provided with the spring fixed bolster that is used for fixed first reset spring in the slide rail, the upper and lower two sides of detecting the piece all offsets with the first limiting plate surface that corresponds, the center of detecting the piece is provided with the through-hole, is provided with the locating lever that the level set up in the through-hole, first reset spring's one end overlaps on the locating lever, and the other end overlaps on spring fixed bolster.

As preferred, for the convenience of limiting, avoid when toggle switch does not open, because detect the piece shift position too big and directly lead to the moving plate to offset with the contact button and the starter motor produces the potential safety hazard, all be provided with the stopper that the restriction detected the piece removal in the upper and lower two sides of detecting the piece, the stopper is located one side of two first limiting plates to when detecting the piece removal, can offset with first limiting plate and realize spacingly.

Preferably, the moving plate comprises a rotating part and a connecting rod positioned on one side of the rotating part, the rotating part is rotatably connected to the detecting plate through a rotating shaft, and the bidirectional torsion spring is sleeved outside the rotating shaft and rotates along with the rotating shaft.

The invention also discloses an angle grinder with the mechanical power-off protection mechanism, which comprises the mechanical power-off protection mechanism, a handle and a battery pack, a battery slot for inserting a battery pack is arranged on the left side of the handle, a movable groove for placing a toggle switch is arranged at the upper end of the handle, the toggle switch can horizontally move in the movable groove, a motor and a microswitch electrically connected with the motor are arranged in the handle, the output shaft of the motor is connected with a transmission mechanism driven by the output shaft of the motor, a working head which is connected with the transmission mechanism and is driven by the transmission mechanism to rotate is arranged on the right side of the handle, the handle include back base and the preceding lid of mutual lock, the slide rail locate on the back base inner wall, the pull rod arrange the handle in, the one end of detecting the piece is located the battery slot.

For the convenience of limiting, a second limiting plate used for limiting the moving position of the pull rod is further arranged on the inner wall of the rear base, a first longitudinal rod extending downwards is arranged at the front end of the pull rod, a second transverse rod horizontally arranged is connected to the lower end of the first longitudinal rod, a hook portion is arranged at the other end of the second transverse rod, the first longitudinal rod is located on the right side of the second limiting plate, and the second transverse rod is located below the second limiting plate.

Preferably, in order to facilitate resetting, a connecting column located on the left side of the second limiting plate is arranged at the rear end of the second cross rod, and a second resetting spring is arranged between the connecting column and the second limiting plate.

In order to improve the fixing effect on the micro switch, a positioning bracket is arranged in the rear base, and the micro switch is arranged in the positioning bracket.

In order to facilitate disassembly, the right side of the battery pack is provided with an elastic buckle, and a clamping groove matched with the elastic buckle is arranged in the battery slot.

In order to have certain antiskid nature when using, have the silica gel cover in the handle overcoat.

Compared with the prior art, the invention has the following technical effects: can realize that the one end when detecting the piece is extruded by the battery of male assurance rotor to the contact button removal, be close to the contact button, make the distance of contact button and rotor be short than the distance when not inserting the battery, then become the start position from original shut-off position through promoting toggle switch, in opening the in-process, along with toggle switch's promotion can drive the hook portion on pull rod and the pull rod simultaneously and remove, let hook portion be close to the rotor at this moment, and it is rotatory to drive the rotor, let the one end of rotor press to the contact button, in order to realize triggering the contact button and close the effect that finally realizes the power supply, consequently, set up the guard action that realizes the battery outage with mechanized structure through above-mentioned structural design, make whole structural operation simpler, moreover, the structure is also relatively simple, the cost is lower.

Drawings

Fig. 1 is a schematic structural diagram of a mechanical power-off protection mechanism in this embodiment 1;

FIG. 2 is a schematic structural view of the detecting plate and the moving plate in FIG. 1;

FIG. 3 is a schematic view of the detector of FIG. 1 with the rotor removed;

fig. 4 is a schematic overall structure diagram of an angle grinder with a mechanical power-off protection mechanism in the embodiment 1;

FIG. 5 is a schematic structural diagram of an angle grinder with a mechanical power-off protection mechanism in the embodiment 1 without a front cover;

FIG. 6 is a schematic structural diagram of an angle grinder with a mechanical power-off protection mechanism in the embodiment 1 when no battery pack is installed;

FIG. 7 is a schematic view showing the structure of a drawbar in this embodiment 1;

FIG. 8 is a schematic structural diagram of an angle grinder with a mechanical power-off protection mechanism according to embodiment 1 when the front cover is not installed and the outer cover is separated from the handle;

FIG. 9 is a schematic structural diagram of the rear chassis in this embodiment 1;

FIG. 10 is a schematic view showing a first state of a toggle switch, a microswitch and a detection piece in embodiment 1;

FIG. 11 is a schematic view showing a second state of the toggle switch, the microswitch and the detection piece in embodiment 1;

FIG. 12 is a schematic view showing a third state of the toggle switch, the microswitch and the detection piece in embodiment 1;

FIG. 13 is a schematic view showing a fourth state of the toggle switch, the microswitch and the detection piece in embodiment 1;

FIG. 14 is a schematic view showing a fifth state of the toggle switch, the microswitch and the detection piece in embodiment 1;

fig. 15 is a schematic view of the states of two critical points in example 1.

Wherein: the detection device comprises a microswitch 1, a toggle switch 2, a slide rail 3, a hook part 5, a pull rod 4, a detection sheet 6, a moving sheet 7, a contact button 1-1, a bidirectional torsion spring 8, a first limit plate 10, a first return spring 9, a spring fixing support 11, a through hole 12, a locating rod 13, a limit block 14, a rotating part 15, a connecting rod 16, a rotating shaft 17, a handle 18, a battery pack 19, a battery slot 20, a movable groove 21, a motor 22, a transmission mechanism 23, a working head 24, a rear base 25, a front cover 26, a second limit plate 27, a first longitudinal rod 28, a second transverse rod 29, a connecting column 30, a second return spring 31, a locating support 32, an elastic buckle 33, a clamping groove 34, a silica gel sleeve 35, an outer cover 36, a first limit table 37, a second limit table 38, a sector rotating area 39, a rotating boss 40 and a limit boss 41.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in order to make the technical solution of the present invention easier to understand and understand.

Example 1:

as shown in fig. 1 to 3, the mechanical power-off protection mechanism disclosed in this embodiment includes a micro switch 1 and a toggle switch 2, and further includes a slide rail 3 and a pull rod 4 having one end connected to the toggle switch 2 and the other end provided with a downward extending hook portion 5, wherein a detection piece 6 for detecting whether a battery is installed is slidably connected in the slide rail 3, and one end of the detection piece 6 is abutted to the battery in a matching manner and can move and approach to a contact switch 1-1 of the micro switch 1 when the battery is installed; after the battery is arranged on the detection sheet 6 and falls off, the first reset spring 9 for driving the detection sheet 6 to reset is arranged at one end of the detection sheet 6 close to the microswitch 1, the bidirectional torsion spring 8 and the limit boss 41 matched with the bidirectional torsion spring 8 in a limit way are arranged, two support legs of the bidirectional torsion spring 8 are arranged at two sides of the limit boss 41 and abut against the limit boss 41, the end of the detection sheet 6 close to the microswitch 1 is further rotatably provided with a movable sheet 7, the movable sheet 7 is arranged between the two support legs of the bidirectional torsion spring 8, the detection sheet 6 is further respectively provided with a first limit platform 37 and a second limit platform 38, a fan-shaped rotating area 39 of the movable sheet 7 is formed between the first limit platform 37 and the second limit platform 38, as shown in figure 15, the movable sheet 7 can abut against the end surface of the hook part 5 in the rotating process of the fan-shaped rotating area 39 towards the direction of the microswitch to form a first critical point B, the moving plate 7 can abut against the end surface of the hook part 5 to form a second critical point A in the process of rotating towards the direction away from the microswitch in the fan-shaped rotating area 39;

the toggle switch 2 drives the hook part 5 to reciprocate at a starting position and a shutdown position through a pull rod 4; when the hook part 5 is at the power-off position, the moving plate 7 can cross a second critical point in the battery installation process, and when the hook part 5 moves from the power-off position to the power-on position under the state of installing the battery, the hook part 5 drives the moving plate 7 to rotate relative to the detection plate 6, and when the hook part 5 is at the power-on position, the moving plate 7 triggers the contact switch 1-1;

when the hook part 5 is in a starting position and the battery falls off, the detection sheet 6 is far away from the microswitch 1, and the moving sheet 7 passes through the first critical point at the moment to reset the microswitch 1; when the hook part 5 is in the power-on position, if the battery is inserted again, the moving plate 7 cannot pass through the second critical point, the battery cannot be installed, and the micro switch 1 cannot be started.

As preferred, be provided with rotatory boss 40 in the one end of detecting piece 6, the rotor 7 rotates and connects on rotatory boss 40, slide rail 3 constitute by the first limiting plate 10 that two upper and lower intervals set up, be provided with the spring fixed bolster 11 that is used for fixed first reset spring 9 in slide rail 3, detect the upper and lower two sides of piece 6 and all offset with the first limiting plate 10 surface that corresponds, the center of detecting piece 6 is provided with through-hole 12, is provided with the locating lever 13 that the level set up in through-hole 12, the one end cover of first reset spring 9 is on locating lever 13, and the other end overlaps on spring fixed bolster 11, makes effectively to carry on spacingly to first reset spring 9 through above-mentioned structure setting, can guarantee again that the later stage battery dismantles the back, and it is faster to reset.

Through the structure, when one end of the detection sheet 6 is extruded by the inserted battery to ensure that the moving sheet 7 moves towards the contact button 1-1, and in the moving process, the moving sheet 7 can cross a first critical point to ensure that the moving sheet 7 can cross the hook part 5 under the power-on state and is close to the contact button 1-1, so that the distance between the contact button 1-1 and the moving sheet 7 is shorter than that under the condition that the battery is not inserted, then the original power-off position is changed into the power-on position by pushing the toggle switch 2, in the opening process, the pull rod 4 and the hook part 5 on the pull rod 4 are synchronously driven to move along with the pushing of the toggle switch 2, the hook part 5 is close to the moving sheet 7 at the moment, the moving sheet 7 is driven to rotate, one end of the moving sheet 7 is pressed towards the contact button 1-1 to realize the closing of the trigger contact button 1-1, and finally realize the power supply function, if the battery falls off carelessly, the detection piece 6 moves in the direction away from the microswitch 1 under the action of the first return spring 9, and the moving piece 7 passes through the first critical point, so that the moving piece 7 can pass through the hook part 5 at the starting position, and the microswitch 1 is reset; if insert the battery again this moment, the rotor 7 can't cross the second critical point, and the battery can't be installed this moment, and micro-gap switch 1 can't start to realize power-off protection's effect, consequently set up the guard action that realizes the battery outage with mechanized structure through above-mentioned structural design, make whole structure operation simpler moreover, the structure is also simple relatively, and the cost is lower.

Preferably, in order to facilitate limiting, and avoid potential safety hazards caused by starting the motor by directly abutting the moving sheet 7 against the contact button 1-1 due to an excessively large moving position of the detection sheet 6 when the toggle switch 2 is not opened, the upper and lower surfaces of the detection sheet 6 are both provided with limiting blocks 14 for limiting the movement of the detection sheet 6, the limiting blocks 14 are positioned on one side of the two first limiting plates 10 and can abut against the first limiting plates 10 to realize limiting along with the movement of the detection sheet 6, through the above structure arrangement, even if the battery is installed, the limiting of the moving position of the detection sheet 6 can be realized, and the situation that the contact button 1-1 is pressed down to start the equipment due to the excessively large moving position of the detection sheet 6 is avoided, which easily causes safety problems of users under informed conditions, and reduces safety, therefore, the above structure is designed, the moving distance of the detection sheet 6 is limited through the first limiting plate 10, when the battery is installed, the distance between the detection sheet 6 and the contact button 1-1 is ensured, and only when the battery is installed and the toggle switch 2 is changed from a closed position to a starting position, the battery can be started, so that the safety is improved.

Preferably, the moving plate 7 comprises a rotating part 15 and a connecting rod 16 positioned on one side of the rotating part 15, the rotating part 15 is rotatably connected to the detecting plate 6 through a rotating shaft 17, the bidirectional torsion spring 8 is sleeved outside the rotating shaft 17 and rotates along with the rotating shaft 17, and the structure is convenient to operate through the structural arrangement.

The specific structure of the above structure applied to the angle grinder will be described below: as shown in fig. 4-9, this embodiment further discloses a corner grinder with a mechanical power-off protection mechanism, which includes the above-mentioned mechanical power-off protection mechanism, the structure further includes a handle 18 and a battery pack 19, a battery slot 20 for inserting the battery pack 19 is provided on the left side of the handle 18, a movable slot 21 for placing a toggle switch 2 is provided on the upper end of the handle 18, the toggle switch 2 can horizontally move in the movable slot 21, a motor 22 and a micro switch 1 electrically connected with the motor 22 are provided in the handle 18, an output shaft of the motor 22 is connected with a transmission mechanism 23 driven by an output shaft of the motor 22, a working head 24 connected with the transmission mechanism 23 and driven to rotate by the transmission mechanism 23 is provided on the right side of the handle 18, the handle 18 includes a rear base 25 and a front cover 26 that are fastened to each other, the slide rail 3 locate on the inner wall of the back base 25, the pull rod 4 locate in the handle 18, one end of the detection piece 6 is located in the battery slot 20, and the outer side of the transmission mechanism 23 is provided with an outer cover 36 matched with the handle 18 in the embodiment.

For limiting conveniently, a second limiting plate 27 used for limiting the moving position of the pull rod 4 is further arranged on the inner wall of the rear base 25, a first vertical rod 28 extending downwards is arranged at the front end of the pull rod 4, a second transverse rod 29 horizontally arranged is connected to the lower end of the first vertical rod 28, the other end of the second transverse rod 29 is provided with the hook portion 5, the first vertical rod 28 is located on the right side of the second limiting plate 27, and the second transverse rod 29 is located below the second limiting plate 27.

Preferably, a connection post 30 positioned on the left side of the second stopper plate 27 is provided at the rear end of the second crossbar 29, and a second return spring 31 is provided between the connection post 30 and the second stopper plate 27, for the convenience of return.

In order to improve the fixing effect on the micro switch, a positioning bracket 32 is arranged in the rear base 25, the micro switch 1 is arranged in the positioning bracket 32, the micro switch 1 is positioned by arranging the positioning bracket 32, and the fixing effect on the micro switch 1 is improved.

For the convenience of disassembly, an elastic buckle 33 is arranged on the right side of the battery pack 19, a clamping groove 34 matched with the elastic buckle 33 is arranged in the battery slot 20, the battery pack 19 is convenient to disassemble through the structure, and when the battery pack 19 needs to be taken down, the operation button above the side edge of the battery pack 19 is pulled off, so that the elastic buckle 33 is separated from the buckling part on the battery slot 20 through the operation button, and the battery can be disassembled.

In order to have certain antiskid nature when using, have silica gel cover 35 at handle 18 overcoat, make to have certain antiskid nature when operating through setting up silica gel cover 35, conveniently hold.

When the mechanical power-off protection mechanism works, the mechanical power-off protection mechanism has the following states:

in the first state: when the battery pack 19 is not inserted, the toggle switch 2 is at the shutdown position at the moment, the pull rod 4 is far away from the contact button 1-1, and the detection piece 6, the pull rod 4 and the microswitch 1 are at the state shown in fig. 10 at the moment; the motor cannot be started no matter how the pull rod is operated,

in the second state: in the first state, when the battery pack 19 is inserted, the detection piece 6 moves towards the microswitch 1, so that the moving piece 7 is close to the contact button 1-1, and the pull rod 4 is far away from the contact button 1-1, in the process, as the moving piece 7 is hinged to the pull rod 4 through the rotating shaft 17, when the moving piece 7 moves along with the detection piece 6, the moving piece 7 can cross the second critical point, so that the moving piece 7 can cross the hook part 5 in the power-on state and be close to the contact button 1-1, the distance between the contact button 1-1 and the moving piece 7 is shorter than that when the battery is not inserted, and when the moving piece 7 crosses the hook part 5, the moving piece is reset under the action of the bidirectional torsion spring, and the state is as shown in fig. 11;

the third state: in a second state, the toggle switch 2 is turned on, at the moment, the toggle switch 2 can push the moving plate 7 close to the contact button 1-1 to rotate and touch the contact button 1-1, at the moment, the contact button 1-1 is pressed to ensure that the microswitch 1 is turned off, and the process of power-on starting is realized; the state at this time is shown in fig. 12;

the fourth state: under the starting state of the motor, namely the toggle switch 2 is changed from the original shutdown position to the startup position, if the battery pack 19 falls off carelessly at the moment, the battery pack moves towards the direction far away from the microswitch 1 under the action of the first return spring 9, then when the moving plate 7 is close to the hook part 5, because the moving plate 7 is hinged on the pull rod 4 through the rotating shaft 17, the moving plate 7 rotates towards the direction close to the microswitch firstly, then the rotating return is carried out under the action of the bidirectional torsion spring to jump over the hook part 5, so that the moving plate 7 reaches the left side of the hook part, and the state at the moment is shown in fig. 13, so that the moving plate 7 crosses the first critical point, the moving plate 7 is ensured to cross over the hook part 5 in the startup state, and the microswitch 1 is reset;

in the fifth state: in the fourth state, even if the battery pack is inserted again, the toggle switch 2 is turned on and off again, the battery pack cannot be turned on at the moment, because the moving plate cannot return to a position between the hook part and the contact button 1-1 by bypassing the lower end part of the hook part due to the limitation of the position of the hook part, only when the pull rod is reset again, the state is changed from the on state to the off state, when the pull rod moves to a certain position firstly, the contact point of the moving plate and the pull rod is in a critical state (namely, the moving plate can bypass the hook part under the action of a rotating shaft), the pull rod is continuously reset, the moving plate has no resistance at the moment, the moving plate automatically stays in the first state, namely, the standby state under the action of the bidirectional torsion spring, as shown in figure 14, the battery pack is turned on again at the moment, the motor can be turned on again, therefore, the protection function of battery power failure is realized by the, and the structure is relatively simple, and the cost is lower.

The above is, of course, only a specific application example of the present invention, and the scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims

1. The utility model provides a mechanical type power-off protection mechanism, includes micro-gap switch (1) and toggle switch (2), its characterized in that: the battery protection device is characterized by further comprising a sliding rail (3) and a pull rod (4) with one end connected with the toggle switch (2) and the other end provided with a hook part (5) which extends downwards, a detection sheet (6) used for detecting whether a battery is installed is connected in the sliding rail (3) in a sliding mode, one end of the detection sheet (6) is matched and abutted with the battery and can move and approach to a contact switch (1-1) of the microswitch (1) when the battery is installed; after a battery is arranged on the detection sheet (6) and falls off, a first reset spring (9) for driving the detection sheet (6) to reset is arranged, one end of the detection sheet (6) close to the micro switch (1) is provided with a bidirectional torsion spring (8) and a limit boss (41) matched with the bidirectional torsion spring (8) in a limiting way, two support legs of the bidirectional torsion spring (8) are positioned on two sides of the limit boss (41) and abut against the limit boss (41), one end of the detection sheet (6) close to the micro switch (1) is also rotatably provided with a movable sheet (7), the movable sheet (7) is positioned between the two support legs of the bidirectional torsion spring (8), the detection sheet (6) is also respectively provided with a first limit table (37) and a second limit table (38), and a sector-shaped rotating area (39) of the movable sheet (7) is formed between the first limit table (37) and the second limit table (38), the moving plate (7) can abut against the end face of the hook part (5) to form a first critical point in the process that the fan-shaped rotating area (39) rotates towards the direction of the micro-switch, and the moving plate (7) can abut against the end face of the hook part (5) to form a second critical point in the process that the fan-shaped rotating area (39) rotates towards the direction far away from the micro-switch;

the toggle switch (2) drives the hook part (5) to reciprocate at a starting position and a shutdown position through a pull rod (4); when the hook part (5) is at a shutdown position, the moving plate (7) can cross a second critical point in the battery installation process, and when the hook part (5) moves from the shutdown position to a startup position under the state of installing the battery, the hook part (5) drives the moving plate (7) to rotate relative to the detection plate (6), and when the hook part (5) is at the startup position, the moving plate (7) triggers the contact switch (1-1);

when the hook part (5) is in a starting position and the battery falls off, the detection sheet (6) is far away from the microswitch (1), and the moving sheet (7) crosses the first critical point to reset the microswitch (1); when the hook part (5) is in the starting position, if the battery is inserted again, the moving plate (7) cannot cross the second critical point, the battery cannot be installed, and the micro switch (1) cannot be started.

2. The mechanical power-off protection mechanism of claim 1, wherein: be provided with rotatory boss (40) in the one end of detecting piece (6), moving plate (7) are rotated and are connected on rotatory boss (40), slide rail (3) constitute by first limiting plate (10) that two upper and lower intervals set up, be provided with spring fixed bolster (11) that are used for fixed first reset spring (9) in slide rail (3), the upper and lower two sides of detecting piece (6) all offsets with first limiting plate (10) surface that corresponds, the center of detecting piece (6) is provided with through-hole (12), is provided with locating lever (13) that the level set up in through-hole (12), the one end cover of first reset spring (9) is on locating lever (13), and the other end cover is on spring fixed bolster (11).

3. A mechanical power-off protection mechanism as claimed in claim 2, wherein: limiting blocks (14) for limiting the movement of the detection sheet (6) are arranged on the upper surface and the lower surface of the detection sheet (6), and the limiting blocks (14) are located on one side of the two first limiting plates (10).

4. A mechanical power-off protection mechanism as claimed in claim 1, 2 or 3, wherein: the moving plate (7) comprises a rotating part (15) and a connecting rod (16) located on one side of the rotating part (15), the rotating part (15) is connected to the rotating boss (40) in a rotating mode through the rotating shaft (17), and the bidirectional torsion spring (8) is sleeved outside the rotating shaft (17) and rotates along with the rotating shaft (17).

5. An angle grinder with a mechanical power-off protection mechanism, which comprises the mechanical power-off protection mechanism as claimed in any one of claims 1 to 3, and is characterized in that: the battery pack cleaning device is characterized by further comprising a handle (18) and a battery pack (19), a battery slot (20) for inserting the battery pack (19) is formed in the left side of the handle (18), a movable groove (21) for placing a toggle switch (2) is formed in the upper end of the handle (18), the toggle switch (2) can horizontally move in the movable groove (21), a motor (22) and a microswitch (1) electrically connected with the motor (22) are arranged in the handle (18), an output shaft of the motor (22) is connected with a transmission mechanism (23) driven by an output shaft of the motor (22), a working head (24) connected with the transmission mechanism (23) and driven to rotate by the transmission mechanism (23) is arranged on the right side of the handle (18), the handle (18) comprises a rear base (25) and a front cover (26) which are mutually buckled, and the sliding rail (3) is arranged on the inner wall of the rear base (25), the pull rod (4) is arranged in the handle (18), and one end of the detection sheet (6) is positioned in the battery slot (20).

6. An angle grinder with mechanical power-off protection mechanism according to claim 5, characterized in that: second limiting plate (27) that are used for restricting pull rod (4) shift position are still located to back base (25) inner wall, the front end of pull rod (4) is provided with downwardly extending's first vertical pole (28), is connected with second horizontal pole (29) that the level set up at the lower extreme of first vertical pole (28), and the other end of second horizontal pole (29) is provided with hook portion (5), first vertical pole (28) are located the right side of second limiting plate (27), second horizontal pole (29) are located second limiting plate (27) below.

7. The angle grinder with the mechanical power-off protection mechanism according to claim 6, wherein: a connecting column (30) positioned on the left side of the second limiting plate (27) is arranged at the rear end of the second cross rod (29), and a second return spring (31) is arranged between the connecting column (30) and the second limiting plate (27).

8. An angle grinder with mechanical power-off protection mechanism according to claim 5, characterized in that: a positioning bracket (32) is arranged in the rear base (25), and the microswitch (1) is arranged in the positioning bracket (32).

9. An angle grinder with mechanical power-off protection mechanism according to claim 5, characterized in that: an elastic buckle (33) is arranged at the right side of the battery pack (19), and a clamping groove (34) matched with the elastic buckle (33) is arranged in the battery slot (20).

10. An angle grinder with mechanical power-off protection mechanism according to claim 5, characterized in that: a silica gel sleeve (35) is sleeved outside the handle (18).