CN211404445U - Electric tool - Google Patents

Abstract

The utility model discloses an electric tool, include: a tool accessory; the motor, with the motor that the instrument annex is connected, with motor electric connection's drive circuit, with drive circuit electric connection's control module, with drive circuit electric connection's power module to and switching device, switching device includes: a trigger mechanism; the current switch is arranged in association with the trigger mechanism to be triggered by the trigger mechanism and is used for switching on and switching off the electrical connection between the power supply module and the motor; and the signal switch is arranged in association with the trigger mechanism to be triggered by the trigger mechanism, and is at least used for outputting an electric signal to the control module so that the control module controls the motor to brake. The utility model discloses electric tool, its switching device collection is integrated simultaneously has current switch and signal switch, can strengthen switching system stability, reduces the inefficacy risk, and compact structure, and the cost is lower.

Description

Electric tool

Technical Field

The utility model relates to an electric tool.

Background

Electric tool such as angle grinder, circular saw, its operating current is great, and this great operating current is born by the heavy current switch who sets up on the major loop usually, and the spark is produced easily to heavy current switch's contact, leads to the contact to warp or the inefficacy, has the potential safety hazard. Therefore, there is a need for a scheme that can avoid switch control failure when carrying a large current, so as to improve the accuracy of switch control in the electric tool and further improve the safety of the electric tool.

Disclosure of Invention

For solving the not enough of prior art, the utility model provides an electric tool that security is high, the cost is lower and on-off control is difficult for becoming invalid.

In order to achieve the above object, the utility model adopts the following technical scheme:

a power tool, comprising: a tool accessory; a motor coupled to the tool attachment to drive the tool attachment; the driving circuit is electrically connected with the motor and is used for loading the electric energy of the power supply module to the motor; the control module is electrically connected with the driving circuit and used for controlling the driving circuit; the power supply module is electrically connected with the driving circuit and used for supplying electric energy to the motor; a switching device, comprising: a trigger mechanism; a current switch disposed in association with the trigger mechanism to be triggered by the trigger mechanism; the current switch is used for switching on and switching off the electrical connection between the power supply module and the motor; a signal switch disposed in association with the trigger mechanism to be triggered by the trigger mechanism; the signal switch is at least used for outputting an electric signal to the control module so that the control module controls the motor to brake.

Optionally, the method further comprises: the power supply circuit is electrically connected to the power supply module and the control module and is used for converting the electric energy of the power supply module into electric energy capable of supplying power to the control module; the signal switch is electrically connected with the power circuit and is also used for triggering the power circuit to work so that the power circuit supplies power for the control module.

Optionally, the switching device comprises: a switch housing accommodating the current switch and the signal switch; the actuating pull rod is connected with the triggering mechanism and driven by the triggering mechanism to move along a first direction; the current switch includes: the movable contact frame is connected with the actuating pull rod in a linkage manner and can move in a direction opposite to the first direction under the driving of the actuating pull rod; the static contact is arranged in the switch shell; the moving contact is arranged on the moving contact frame, moves relative to the fixed contact along with the moving contact frame and is contacted with or separated from the fixed contact.

Optionally, the fixed contact includes: the two first static contacts are electrically connected with the motor, and the two second static contacts are electrically connected with the power supply module; the two first static contacts are connected through a metal sheet, and the two second static contacts are connected through a metal sheet; the moving contact comprises: the two first movable contacts are respectively used for being connected with the two first fixed contacts, and the two second movable contacts are respectively used for being connected with the two second fixed contacts; the two first movable contacts are connected through a metal sheet, and the two second movable contacts are connected through a metal sheet.

Optionally, the switching device comprises: and the first elastic element is arranged between the actuating pull rod and the switch shell and is used for resetting the actuating pull rod.

Optionally, the switching device comprises: and the second elastic element is arranged between the actuating pull rod and the movable contact frame and is used for enabling the actuating pull rod to drive the movable contact frame to move.

Optionally, the current switch comprises: a stopper disposed adjacent to the movable contact carrier for abutting against the movable contact carrier, the stopper being movable in a second direction substantially perpendicular to the first direction; an elastic conductor provided to the stopper, the elastic conductor being capable of following the stopper to move; and the conductive sheet is arranged near the stop piece and is in contact with the elastic conductor.

Optionally, one end of the actuating lever is formed with a wedge structure for lifting the stopper.

Optionally, the elastic electrical conductor comprises: the first elastic conductor and the second elastic conductor are connected through a conductor; the conductive sheet includes: a first conductive sheet in contact with the first elastic conductor; a second conductive sheet in contact with the second elastic conductor; the second conductive sheet comprises a first part and a second part which are arranged in a mutually separated way; the signal switch is in a first state when the second elastic conductor is in contact with the first portion; the signal switch is in a second state when the second elastic conductor is in contact with the second portion; when the signal switch is switched from the second state to the first state, the signal switch is used for triggering the control module to control the motor to brake; when the stopper moves in the second direction, the second elastic conductor contacts the first portion first and then contacts the second portion.

Optionally, the movable contact frame is provided with a groove, and the second elastic conductor is in contact with the second portion when the stopper moves to contact the groove along the second direction.

Has the advantages that: the utility model discloses electric tool, its switching device is integrated simultaneously has current switch and signal switch, can strengthen the steady nature of switching system, reduces the inefficacy risk, and compact structure, and the cost is lower.

Drawings

Fig. 1 is an external view of an electric power tool of an embodiment;

FIG. 2 is a schematic electrical circuit diagram of one embodiment of the electrical tool shown in FIG. 1;

FIG. 3 is a block diagram of a handle portion of the power tool shown in FIG. 1;

FIG. 4 is a structural view of a switch device of the electric power tool shown in FIG. 1

FIG. 5 is a partial block diagram of the switchgear shown in FIG. 4;

FIG. 6a is a block diagram of a stopper part in the switchgear shown in FIG. 4;

fig. 6b is a structural view of a PCB circuit board portion in the switching device shown in fig. 4;

fig. 7a to 7c show different states of movement of the switching device shown in fig. 4 when the power tool is activated.

Fig. 8a to 8b show different states of movement of the switching device shown in fig. 4 when the power tool is switched off.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

The electric tool of the present invention may be a hand-held electric tool, a garden-type tool, and is not limited herein. The electric tool of the utility model includes but is not limited to the following content: electric tools needing speed regulation, such as a screwdriver, an electric drill, a wrench, an angle grinder and the like, electric tools possibly used for grinding workpieces, such as a sander and the like, and a reciprocating saw, a circular saw, a curve saw and the like possibly used for cutting the workpieces; electric hammers and the like may be used as electric tools for impact use. These tools may also be garden type tools, such as pruners, chain saws; in addition, the tools may be used for other purposes, such as a blender. It is within the scope of the present invention that the electric tools can adopt the essence of the technical solution disclosed below.

Referring to fig. 1, as an embodiment, an electric power tool 10 is exemplified by an electric circular saw, and the electric power tool shown in fig. 1 specifically includes: housing 11, tool accessories, motor 13, switching device 16.

The housing 11 is for accommodating a motor 13, a circuit board, and the like. Optionally, the power tool 10 further includes a handle 12, the handle 12 being formed by a housing 11, the handle 12 being provided with a switch device 16 for operation by a user. The switch device 16 is triggered by user operation to control the operation process of the power tool 10, and the switch device 16 includes a trigger mechanism 161, and the trigger mechanism 161 can be triggered. The tool attachment is used to perform the function of the power tool 10. For electric circular saws, the tool attachment is embodied as a saw blade (not shown), for other electric tools the tool attachment is embodied as an attachment that performs the function of the electric tool, for example, for electric tools the tool attachment is embodied as a drill. The motor 13 is used for driving the tool accessories to work, the motor 13 comprises a stator, a rotor, windings and a motor shaft 131, and the motor shaft 131 is driven by the rotor of the motor 13.

For a circular saw, the power tool further includes: a base plate 17 for contacting a workpiece, the housing 11 being mounted on the base plate 17; the saw blade cover 19 is connected with the shell body 11; the saw blade shaft 18 is used for supporting the saw blade to rotate in the saw blade cover 19 so as to cut a workpiece; the transmission 14 is used for transmitting the power output by the motor 13 to the tool accessory, specifically, the transmission 14 connects the motor shaft 131 with the saw blade shaft 18, and transmits the rotary motion of the motor shaft 431 to the saw blade shaft 18 to drive the saw blade to rotate. The transmission 14 may specifically include a reduction mechanism, such as an intermeshing worm and gear mechanism. The worm gear may include a gear structure with different gear ratios, or a synchronous belt drive structure with different synchronous wheel radii. Optionally, a motor 13.

Referring to fig. 2, to control the operation of the power tool 10, the power tool 10 further includes: a power supply module 24, a control module 21, a current switch 26 and a signal switch 27.

The power module 24 is used to provide power to the power tool 10, and more specifically, the power module 24 is used to at least provide power to the motor 13. The power module 24 may include a dc power source or an ac power source. In some embodiments, power module 24 comprises a dc power source, and more specifically, power module 24 comprises battery pack 15. In other embodiments, the power module 24 includes an AC power source, which may be 120V or 220V AC mains power, and the power tool 10 uses AC power, and includes AC-DC power conversion circuitry connected to the AC power for converting the AC power into electrical power for use by the power tool 10.

Optionally, the power tool further includes a driving circuit 22, the control module 21 is electrically connected to the driving circuit 22 for outputting a driving signal to control the driving circuit 22 to operate, and in some embodiments, the control module 21 employs a dedicated control chip, for example, a single chip microcomputer (MCU, micro control module, Microcontroller Unit), a DSP (Digital signal processor, DSP), an ARM (Advanced RISC (Reduced Instruction set computer, RISC microprocessor) chip, or the like.

The driving circuit 22 is used for applying the voltage of the power supply module to the motor 12 to drive the motor 13 to output power, and is electrically connected with the motor 13. The driving circuit 22 is further electrically connected to the control module 21 and receives a driving signal from the control module 21. The driving circuit 22 is electrically connected to the three-phase electrode U, V, W of the motor 13, and thus connected to the winding of the motor 13, so as to drive the motor 13 to operate. The driving circuit 22 shown in fig. 2 includes driving switches VT1, VT2, VT3, VT4, VT5, VT6, and driving switches VT1, VT2, VT3, VT4, VT5, VT6 to form a three-phase bridge. The drive switch may be a MOSFET or an IGBT. The driving switches VT 1-VT 6 change the connection state according to the driving signal output by the control module 21, so as to change the voltage state of the power supply module 24 loaded on the winding of the motor 13, generate an alternating magnetic field to drive the rotor to rotate, further realize the driving of the motor 13 and drive the motor 13 to run. In the present embodiment, the driving circuit 22 is electrically connected to or disconnected from the power supply module 24 through the current switch 26.

Referring to fig. 2, the switching device 16 further includes: a current switch 26 for switching on and off the electrical connection of the power supply module 24 and the motor 13, the current switch 27 being associated with the triggering mechanism 161 to be triggered by the triggering mechanism 161; and a signal switch 27 at least for outputting an electrical signal to the control module 21 to enable the control module 21 to control the motor 13 to brake, wherein the signal switch 27 is associated with the triggering mechanism 161 to be triggered by the triggering mechanism 161.

Specifically, one end of the current switch 26 is electrically connected to the power supply module 24, and the other end is electrically connected to the driving circuit 22, and the motor 13 is electrically connected to or disconnected from the power supply module 24 through the driving circuit 22 and the current switch 26. The current switch 26 is triggered by the trigger mechanism 161 to switch between an on state and an off state, when the current switch 26 is in the on state, the driving circuit 22 is connected to the power supply module 24, and the power supply module 24 can supply power to the motor 13 through the driving circuit 22, specifically, when the current switch 26 is in the on state, the driving circuit 22 is connected to the power supply module 24, and the control module 21 controls the power of the power supply module 24 loaded to the motor 13 by controlling the driving switch of the driving circuit 22 to be turned on or off; when the current switch 26 is in the off state, the electrical connection between the driving circuit 22 and the power supply module 24 is disconnected, and the power supply module 24 stops supplying power to the driving circuit 22.

The signal switch 27 is associated with the trigger mechanism 161 to be triggered by the trigger mechanism 161. The signal switch 27 is electrically connected to the control module 21, and the signal switch 27 is at least used for outputting an electrical signal to the control module 21 so that the control module 21 controls the motor 13 to brake. The signal switch 27 has a first state and a second state, and is triggered by the trigger mechanism 161 to switch between the first state and the second state.

Optionally, the signal switch 27 is further electrically connected to the power circuit connection 25, and the signal switch 27 is further configured to trigger the power circuit 25 to operate during the starting process of the power tool 10, so that the power circuit 25 provides power to the control module 21. That is, during the starting process of the power tool 10, the signal switch 27 is in a state for triggering the power circuit 25 to operate, so that the power circuit 25 supplies power to the control module 21, and the power tool 10 is powered on; the signal switch 27 is used to provide a braking signal to the control module 21 to enable the control module 21 to control the motor 13 to brake during the power-off process of the power tool 10.

The power circuit 25 is used to convert the power from the power module 24 into power for the control module 21 and the electrical components. The power supply circuit 25 is connected to the power supply module 24 and the control module 21.

Optionally, the power tool 10 further includes a signal switch state detection circuit 28, the signal switch state detection circuit 28 is electrically connected to the signal switch 27 and the control module 21, the signal switch state detection circuit 28 is configured to detect a state of the signal switch 27 and send detected state information of the signal switch 27 to the control module 21, and the control module 21 controls the motor 13 to brake according to the state of the signal switch 27.

Optionally, the power tool 10 further includes a current switch state detection circuit 29, and the current switch state detection circuit 29 is electrically connected to the current switch 26 and the control module 21 for detecting the on/off state of the current switch 26.

The control module 21 can receive the electric signals of the signal switch state detection circuit 28 and the current switch state detection circuit 29, and the control module 21 controls the operation process of the motor 13 according to the received electric signals of the switch state detection circuits. By providing the switching state detection circuit, it is possible to effectively prevent the electric power tool 10 from malfunctioning when the current switch 26 or the signal switch 27 cannot be effectively triggered or erroneously triggered due to a failure in the mechanical structure of the switching device. The software mode formed by the hardware switch and the switch state detection circuit forms double protection to avoid unexpected misoperation of the electric tool 10.

Alternatively, the signal switch 27 and the current switch 26 are provided as one integral structure. Referring to fig. 3 and 4, as a structure of one embodiment of the switching device 16, the signal switch 27 and the current switch 26 are provided as an integral structure.

Referring to fig. 2 and 4, the switching device 16 specifically includes: trigger mechanism 161, switch housing 162, actuating lever 163. The current switch 26 and the signal switch 27 are disposed in a switch housing 162, and the switch housing 162 is used to accommodate the current switch 26 and the signal switch 27.

The trigger mechanism 161 is operable by a user, and the trigger mechanism 161 is, for example, a trigger. The current switch 26 and the signal switch 27 are disposed in the switch housing 162, and the current switch 26 and the signal switch 27 are disposed in association with the trigger mechanism 161 to be triggered by the trigger mechanism 161.

The actuating lever 163 is connected to the trigger mechanism 161 and is movable in a first direction F1 (fig. 7 a) by the trigger mechanism 161. The first end 163a of the actuating lever 163 is connected to the trigger mechanism 161, and when the trigger mechanism 161 is activated by a user, the actuating lever 163 is moved relative to the switch housing 162. The actuating lever 163 is further provided with a first resilient element 166 for resetting the actuating lever 163 to its initial position.

The current switch 26 includes: a movable contact frame 164, a fixed contact 261 and a movable contact 262. For convenience of illustration, the moving direction of the actuating lever 163 from the initial position to the final position is defined as a first direction F1. The initial position of the actuating pull rod 163 refers to the position of the pull rod 163 when the trigger mechanism 161 is not triggered, and the final position of the actuating pull rod 163 refers to the position of the actuating pull rod 163 when the trigger mechanism 161 is triggered to the bottom. The position at which the trigger mechanism 161 is not triggered is the initial position of the trigger mechanism 161, and the position at which the trigger mechanism 161 is triggered to the bottom is the final position of the trigger mechanism 161.

Referring to fig. 4, the movable contact frame 164 is connected to the actuating lever 163 to be movable in a direction opposite to the first direction F1 by the actuating lever 163. In some embodiments, a second elastic member 167 is disposed between the movable contact frame 164 and the actuating lever 163, and the actuating lever 163 is connected in association with the movable contact frame 164 through the second elastic member 167. The second elastic member 167 is, for example, a compression spring or a spring.

Optionally, a second resilient member 167 is removably mounted to the movable contact frame 164 and the actuating pull rod 163. Specifically, a first mounting structure 163c for mounting a second elastic member 167 is provided on a side of the actuating lever 163 facing the movable contact holder 164, and correspondingly, another second mounting structure 164c for mounting the second elastic member 167 is provided on the movable contact holder 164, and the second elastic member 167 can be mounted between the movable contact holder 164 and the actuating lever 163 through the first mounting structure 163c and the second mounting structure 164c, and the second elastic member 167 is detachably mounted on the first mounting structure 163c or the second mounting structure 164 c. Alternatively, the second mounting structure 164c is disposed at a middle position of the contact frame 164, and the second elastic member 167 is disposed at a middle position of the movable contact frame 164. When the actuating pull rod 163 moves back and forth along the first direction F1, the movable contact frame 164 can move toward a direction opposite to the moving direction of the actuating pull rod 163 by the urging of the second elastic element 167, so that the movable contact 162 is in contact with or disconnected from the stationary contact 261.

As a specific embodiment, when the second elastic element 167 is a compression spring or a spring, at least one of the first mounting structure 163c and the second mounting structure 164a is a circular protrusion structure having a diameter slightly smaller than that of the spring or the compression spring, so that the spring or the compression spring can be mounted.

Referring to fig. 5, the movable contact 262 is disposed on the movable contact frame 164, the stationary contact 261 is disposed in the switch housing 162, and the movable contact 262 corresponds to the stationary contact 261. The movable contact 262 can contact or separate from the stationary contact 261 following the movement of the movable contact holder 164 with respect to the stationary contact 261.

Specifically, the movable contact 262 is disposed at two ends of the movable contact frame 164, the stationary contact 261 is correspondingly disposed in the switch housing 161, and when the movable contact frame 164 moves, the movable contact 262 is driven to move, so as to drive the movable contact C1, the movable contact D1, the movable contact C2, and the movable contact D2 to contact with or separate from the stationary contact a1, the stationary contact B1, the stationary contact a2, and the stationary contact B2, respectively. When the actuating rod 163 is in its final position, the movable contact 262 is in contact with the stationary contact 261, and the current switch 26 is switched on; when the actuating lever 163 is in its initial final position, the movable contact 262 is in a separated state from the stationary contact 261 and the current switch 26 is open.

Referring to fig. 2 and 4, alternatively, the fixed contact 261 includes a plurality of fixed contacts, the movable contact 262 includes a plurality of movable contacts, and the fixed contacts 261 correspond to the number of the movable contacts 262 one to one.

Optionally, stationary contact 261 comprises four stationary contacts, two first stationary contacts a1 and a2, and two second stationary contacts B1 and B2. The two first stationary contacts a1 and a2 are electrically connected to the motor 13, and specifically, the two first stationary contacts a1 and a2 are electrically connected to the motor 13 through the driving circuit 22. The two stationary contacts B1 and B2 are electrically connected to the power supply module 24. The two first stationary contacts a1 and a2 are connected by a first metal sheet, and the two second stationary contacts B1 and B2 are connected by a first metal conductor.

The movable contact 262 includes four movable contacts, two first movable contacts C1 and C2, and two second movable contacts D1 and D2, respectively. Wherein, the two first movable contacts C1 and C2 are respectively used for connecting with the two first fixed contacts a1 and a2, and the two second movable contacts D1 and D2 are respectively used for connecting with the two second fixed contacts B1 and B2. The two first movable contacts C1 and C2 are connected by a second metal sheet, and the two second movable contacts D1 and D2 are connected by a second metal sheet.

In the present embodiment, stationary contact a1 and stationary contact B1 are a first pair of contacts, and stationary contact a2 and stationary contact B2 are a second pair of contacts. The movable contact C1 is for making contact with the stationary contact a1, the movable contact D1 is for making contact with the stationary contact B1, the movable contact C2 is for making contact with the stationary contact a2, and the movable contact D2 is for making contact with the stationary contact B2. That is, the two pairs of contacts may be connected in parallel through the first metal conductor and the movable contact 262.

The current switch 26 uses at least two pairs of contacts to carry all the current output by the power supply module 24, so that sparking of the contacts of the current switch 26 due to carrying a large current can be avoided. In some embodiments, the first metallic conductor copper sheet. In some embodiments, a second metallic conductor copper sheet. The two branches connected with the copper sheet bear the current from the power supply module 24 in parallel, and the copper sheet has good conductivity and good heat dissipation property, so that according to the connection mode, on one hand, the phenomenon that the ignition phenomenon is generated between the switch contacts at the moment of switching-on of large current can be effectively solved, and on the other hand, the copper sheet arranged on the surface of the switch in an attached mode can assist in providing heat dissipation for the current switch.

When the trigger 161 is triggered to connect the moving contact 262 with the stationary contact 261, the current switch 26 is turned on, the power supply module 24 is electrically connected to the driving circuit 22, and the power supply module 24 supplies power to the driving circuit 22 and the motor 13. When the trigger 161 is released to separate the moving contact 262 from the stationary contact 261, the current switch 26 is turned off, and the power supply module 24 stops supplying power to the driving circuit 22 and the motor 13.

The signal switch 27 includes: a stopper 165, an elastic conductor 169, a conductive sheet 170, and a PCB 171.

For convenience of illustration, the moving direction of the stopper 165 from the initial position to the final position is defined as a second direction F2. The initial position of the stopper 165 refers to the position of the stopper 165 when the trigger mechanism 161 is not triggered, and the final position of the stopper 165 refers to the position of the stopper 165 when the trigger mechanism 161 is triggered to the bottom.

A stopper 165 is provided in association with the second end 163b of the actuating lever 163, and in particular, the second end 163b of the actuating lever 163 is provided with a wedge structure 163d for interfering with and lifting the stopper 165 when the actuating lever 163 moves toward the stopper 165.

A stop 165 is disposed in the switch housing 162 proximate the second end 163b of the actuating link 163. The stopper 165 is movable relative to the switch case 162 in a second direction F2 substantially perpendicular to the first direction F1. The first end 165a of the stopper 165 is disposed in the switch housing 162 by the third elastic member 168, and specifically, the first end 165a of the stopper 165 is in contact with one end of the third elastic member 168, and the other end of the third elastic member 168 abuts against the inner surface of the switch housing 162. The second end 165b of the stopper 165 can be in non-simultaneous contact with the actuating lever 163 and the movable contact frame 164. The movable contact holder 164 is provided with a groove 164d, and the groove 164d is used to contact the stopper 165 when the movable contact holder 164 moves to approach the stopper 165. The stopper 165 also serves to abut against the movable contact holder 164 and prevent the first end 164a of the movable contact holder 164 from being lifted up, so as to prevent the movable contact 262 from being misaligned with the stationary contact 261.

Referring to fig. 6a, an elastic conductor 169 is arranged on the stopper 165, the elastic conductor 169 being able to follow the stopper 165, the elastic conductor 169 being, for example, a structure in the form of a brush. Referring to fig. 6b, a PCB 171 is disposed opposite to the elastic conductor 169, an electric conductive sheet 170 is disposed on the PCB 171, the electric conductive sheet 170 is disposed near the stopper 165, and the elastic conductor 169 can contact the electric conductive sheet 170. When the stopper 165 moves F2 in the second direction relative to the switch housing 162, the elastic conductor 169 on the stopper 165 is driven to slide on the conductive sheet 170. The PCB 171 is disposed to extend along the stopper 165 and the moving direction of the elastic conductive body 169, i.e., along the second direction F2, and the conductive sheet 170 is disposed along the moving direction of the elastic conductive body 169.

Alternatively, the stopper 165 may be provided with two elastic conductors 169 arranged side by side, namely a first elastic conductor 169a and a second elastic conductor 169b, which are connected by a conductor, and the first elastic conductor 169a and the second elastic conductor 169b may be provided as a single integral structure or integrally molded.

The circuit board 171 is correspondingly provided with two first conductive sheets 170a and two second conductive sheets 170b arranged side by side, the first conductive sheets 170a and the second conductive sheets 170b are arranged in an insulated manner, the first conductive sheets 170a are used for being in contact with the first elastic conductor 169a, and the second conductive sheets 170b are used for being in contact with the second elastic conductor 169 b.

The first and second conductive sheets 170a and 170b are connected to the first and second wires 170c and 170d, respectively, and the first and second wires 170c and 170d are connected to an external circuit or an electronic component. Optionally, the first wire 170c is electrically connected to at least one of the control module 21, the signal switch state detection circuit 28, and the power circuit 25, and the second wire 170d is connected to a power supply of the PCB, such as 2V, 5V, and the like. Optionally, the first conductive wires 170c and the second conductive wires 170d are processed by glue.

The second conductive sheet 170B has a first portion a and a second portion B, which are spaced apart from each other. When the second elastic conductor 169B contacts the first portion a of the second conductive sheet 170B, the signal switch 27 is in a first state, e.g., an off state, and when the second elastic conductor 169B contacts the second portion B of the second conductive sheet 170B, the signal switch 27 is in a second state, e.g., an on state. Alternatively, the first portion a is provided independently, and the second portion B is connected to an external circuit or an electronic component, such as a power supply of a PCB circuit board, through the second wire 170 d. When the stopper 165 moves from the initial position to the final position in the second direction F2, the second elastic conductor 169B contacts the first portion a first and then the second portion B. When the stopper 165 moves in the second direction F2 to contact the groove 164d, the second elastic conductor 169B contacts the second portion B.

When the signal switch 27 is switched from the first state to the second state, the signal switch 27 triggers the power circuit 25 to operate, so that the power circuit 25 supplies power to the control module 24. When the signal switch 27 is switched from the second state to the first state, the trigger control module 21 controls the motor 13 to brake.

Fig. 7a to 7c show different states of movement of the switch device 160 and the states of the switches when the power tool 10 is activated. Fig. 8a to 8b show different movement states of the switch device 160 and states of the switches when the power tool 10 is turned off.

The different states of movement of the switch device 160 when the power tool 10 is activated will first be explained.

Referring to fig. 7a, when the trigger mechanism 161 is not triggered to be in the initial position, the actuating lever 163 is in the initial position, where the first mounting structure 163c and the second mounting structure 164c are staggered with respect to each other such that the second elastic element 167 is biased in a direction toward the stopper 165.

The stopper 165 abuts against the second end 163b of the actuating pull rod 163 due to the elastic force of the second elastic element 167, and the stopper 165 is at the initial position, i.e., the first position in the second direction F2, at this time, the first elastic conductor 169a on the stopper 165 contacts with the first conductive sheet 170a on the PCB 171, and the second elastic conductor 169b on the stopper 165 contacts with the first portion a of the second conductive sheet 170b on the PCB 171, and the signal switch 27 is in the first state, i.e., the off state, because the first portion a is independently disposed. At this time, the movable contact frame 164 has not moved to the position where the movable contact 262 on the movable contact frame 164 is in contact connection with the stationary contact 261 provided in the switch housing 162, and thus the current switch 26 is not turned on but is turned off.

Referring to fig. 7b, when the trigger mechanism 161 is triggered by the user to move the actuating link 163 away from the stopper 165, the actuating link 163 moves in the first direction F1, and when the actuating link 163 moves to a position separated from the stopper 165, the stopper 165 continues to be pushed by the second elastic member 167 to move toward the second direction F2 to contact the movable contact frame 164 without being supported by the actuating link 163, and the stopper 165 is at the second position in the second direction F2. Since the first mounting structure 163c and the second mounting structure 164c are still misaligned with each other at this time, the second elastic member 167 is still biased toward the stopper.

At this time, the first elastic conductor 169a of the stopper 165 contacts the first conductive sheet 170a of the PCB 171, the second elastic conductor 169b of the stopper 165 still contacts the first portion a of the second conductive sheet 170b of the PCB 171, and since the first portion a is independently disposed, no current flows through the signal switch 27, and the signal switch 27 is in an off state. At this time, the movable contact frame 164 has not moved to the position where the movable contact 262 on the movable contact frame 164 is in contact connection with the stationary contact 261 provided in the switch housing 162, and thus the current switch 26 is not turned on but is turned off.

When the user continues to press the trigger mechanism 161 to move the actuating lever 163 away from the stopper 165, i.e., the actuating lever 163 continues to move toward the first direction F1, the second elastic member 167 follows the actuating lever movement 163, and during the movement of the second elastic member 167, the center line of the second elastic member 167 moves from being biased toward the direction opposite to the first direction F1 to being parallel to the second direction F2 to being biased toward the first direction F1, and the second elastic member 167 pushes the movable contact frame 164 to move toward the stopper 165, i.e., to move toward the direction opposite to the first direction F1.

Referring to fig. 7c, when the actuating lever 163 moves toward the first direction F1, the second elastic element 167 is driven to push the movable contact frame 164 to move toward a direction opposite to the first direction F1, that is, the movable contact frame 164 moves toward the stop 165, when the second elastic element 167 moves to a position where the centerline of the second elastic element is biased toward the first direction F1, the movable contact 261 of the movable contact frame 164 is in contact connection with the fixed contact 261 of the switch housing 162, the current switch 26 is turned on, and the electrical connection between the power supply module 24 and the driving circuit 22 is turned on. And when the groove 164d of the movable contact frame 164 moves below the stopper 165, the stopper 165 moves from the second position to the first direction F1 to abut against the groove 164d, and the stopper 165 is in the third position, i.e., the final position of the stopper 165. At this time, the first elastic conductor 169a on the stopper 165 still contacts with the first conductive sheet 170a on the PCB 171, the second elastic conductor 169B on the stopper 165 becomes to contact with the second portion B of the second conductive sheet 170B on the PCB 171, since the second portion B is connected to an external circuit or an electronic component through a wire, a current flows between the elastic conductor 169 and the conductive sheet 170, the signal switch 27 is switched from the first state to the second state, that is, the off state is switched to the on state, and the signal switch 27 triggers the power circuit 25 to operate, so that the power circuit 25 supplies power to the control module 21. When the actuating lever 163 moves in the first direction F1, the current switch 26 is turned on prior to the signal switch 27. Alternatively, the time interval during which the current switch 26 is turned on before the signal switch 27 is less than 20 ms.

During the movement of the actuating lever 163 and the stop 165 from their initial positions to their final positions, i.e., during the start-up of the power tool 10, the current switch 26 is first turned on, the signal switch 27 is then turned on, and the signal switch 27 is changed from the first state to the second state, i.e., from the off state to the on state, to trigger the power circuit 25 to operate the power circuit 25 to supply power to the control module 21 from the power circuit 25, so that the power tool 10 is powered on.

The operation of the switch device 160 and the states of the switches when the power tool 10 is turned off will be described.

Referring to fig. 8a to 8b, when the power tool 10 needs to be turned off, the user releases the trigger mechanism 161, the trigger mechanism 161 starts to return, the actuating pull rod 163 returns in the direction opposite to the first direction F1, the actuating pull rod 163 drives the second elastic element 167 to push the movable contact frame 164 to move in the direction opposite to the first direction F1, that is, the movable contact frame 164 moves away from the stopper 165, and the actuating pull rod 163 moves toward the stopper 165. When the second elastic element 167 moves to a position where the centerline thereof is biased to be opposite to the first direction F1, the wedge structure 163d disposed at the first end 163a of the actuating pull rod 163 contacts with the stopper 165, the actuating pull rod 163 continues to move, the wedge structure 163d pushes the stopper 165 to move toward a direction opposite to the second direction F2 until the stopper 165 is separated from the groove 164d, the stopper returns from the third position to the second position and returns to the first position (initial position), at which time, the first elastic conductor 169a on the stopper 165 contacts with the first conductive sheet 170a on the PCB 171, the second elastic conductor 169b becomes in contact with the first portion a of the second conductive sheet 170b on the PCB 171, and due to the independent disposition of the first portion a, the signal switch 27 is switched from the second state to the first state, at which no current flows between the elastic conductor 169 and the conductive sheet 170, the signal switch 27 is turned from the on state to the off state, and the signal switch 27 triggers the control module 27 to control the motor 13 to brake.

When the actuating rod 163 continues to move toward the stop member 165, the movable contact 262 on the movable contact holder 164 is separated from the stationary contact 261 in the switch housing 162, the current switch 26 is opened, and the electrical connection between the power supply module 24 and the driving circuit 22 is disconnected. That is, when the power tool 10 is turned off, the signal switch 27 is turned off first, and the current switch 26 is turned off later.

The signal switch 27 is configured to cause the control module 21 to control the driving circuit 22 to brake the motor 13 when the signal switch is changed from the first state to the second state, i.e., from the off state to the on state. Specifically, in the process of shutting down the electric power tool, when the signal switch 27 is turned off, an electric signal (e.g., a current signal) generated by the signal switch is transmitted to the control module 21, the control module 21 outputs an electric signal in a PWM (Pulse Width Modulation) format to the driving circuit 22 according to the electric signal generated by triggering the signal switch 27, the driving circuit 22 brakes the motor 13 according to the electric signal, and then the user continues to release the triggering mechanism, the current switch 26 is turned off, and the electric power tool 10 is powered off and stopped.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. An electric power tool, characterized by comprising:

a tool accessory; a power supply module;

a motor coupled to the tool attachment to drive the tool attachment;

the driving circuit is electrically connected with the motor and is used for loading the electric energy of the power supply module to the motor;

the control module is electrically connected with the driving circuit and used for controlling the driving circuit;

the power supply module is electrically connected with the driving circuit and used for supplying electric energy to the motor;

a switching device, comprising:

a trigger mechanism;

a current switch disposed in association with the trigger mechanism to be triggered by the trigger mechanism; the current switch is used for switching on and switching off the electrical connection between the power supply module and the motor;

a signal switch disposed in association with the trigger mechanism to be triggered by the trigger mechanism; the signal switch is at least used for outputting an electric signal to the control module so that the control module controls the motor to brake.

2. The power tool of claim 1,

further comprising:

the power supply circuit is electrically connected to the power supply module and the control module and is used for converting the electric energy of the power supply module into electric energy capable of supplying power to the control module;

the signal switch is electrically connected with the power circuit and is also used for triggering the power circuit to work so that the power circuit supplies power for the control module.

3. The power tool of claim 1,

the switching device includes:

a switch housing accommodating the current switch and the signal switch;

the actuating pull rod is connected with the triggering mechanism and driven by the triggering mechanism to move along a first direction;

the current switch includes:

the movable contact frame is connected with the actuating pull rod in a linkage manner and can move in a direction opposite to the first direction under the driving of the actuating pull rod;

the static contact is arranged in the switch shell;

the moving contact is arranged on the moving contact frame, moves relative to the fixed contact along with the moving contact frame and is contacted with or separated from the fixed contact.

4. The power tool of claim 3,

the static contact includes:

two first stationary contacts electrically connected to the motor, an

The two second stationary contacts are electrically connected with the power supply module;

the two first static contacts are connected through a metal sheet, and the two second static contacts are connected through a metal sheet;

the moving contact comprises:

two first moving contacts for connection with the two first stationary contacts, respectively, and

the two second movable contacts are respectively used for being connected with the two second fixed contacts;

the two first movable contacts are connected through a metal sheet, and the two second movable contacts are connected through a metal sheet.

5. The power tool of claim 3,

the switching device includes:

and the first elastic element is arranged between the actuating pull rod and the switch shell and is used for resetting the actuating pull rod.

6. The power tool of claim 3,

the switching device includes:

and the second elastic element is arranged between the actuating pull rod and the movable contact frame and is used for enabling the actuating pull rod to drive the movable contact frame to move.

7. The power tool of claim 3,

the current switch includes:

a stopper disposed adjacent to the movable contact carrier for abutting against the movable contact carrier, the stopper being movable in a second direction substantially perpendicular to the first direction;

an elastic conductor provided to the stopper, the elastic conductor being capable of following the stopper to move;

and the conductive sheet is arranged near the stop piece and is in contact with the elastic conductor.

8. The power tool of claim 7,

one end of the actuating link is formed with a wedge structure for lifting the stopper.

9. The power tool of claim 7,

the elastic electric conductor includes:

the first elastic conductor and the second elastic conductor are connected through a conductor;

the conductive sheet includes:

a first conductive sheet in contact with the first elastic conductor; a second conductive sheet in contact with the second elastic conductor;

the second conductive sheet comprises a first part and a second part which are arranged in a mutually separated way;

the signal switch is in a first state when the second elastic conductor is in contact with the first portion;

the signal switch is in a second state when the second elastic conductor is in contact with the second portion;

when the signal switch is switched from the second state to the first state, the signal switch is used for triggering the control module to control the motor to brake;

when the stopper moves in the second direction, the second elastic conductor contacts the first portion first and then contacts the second portion.

10. The power tool of claim 9,

the movable contact frame is provided with a groove, and when the stop piece moves along the second direction to contact the groove, the second elastic electric conductor is contacted with the second part.

Images