CN218676858U - Electric tool - Google Patents

Abstract

The utility model relates to the technical field of tools, a electric tool is disclosed. Electric tool includes power source, motor, controller, multichannel control circuit, and power source is used for inserting the power, and the motor is used for providing power for electric tool, and the controller is connected with the operating condition of control motor with the motor at least, and multichannel control circuit includes the contact switch that supplies the user to trigger and the switch element of being connected with the contact switch electricity, and multichannel control circuit includes at least: the first control circuit includes a first contact switch and a first switch element, the second control circuit includes a second contact switch mechanically linked with the first contact switch and a second switch element, and the controller is configured to control the motor to rotate when the first switch element and the second switch element are turned on according to a preset turn-on sequence. Electric tool sets up to mechanical linkage and switches on in proper order in order through setting up two contact switches, makes the electric tool who has the binary channels switch have stable switching performance.

Description

Electric tool

Technical Field

The utility model relates to an instrument technical field especially relates to an electric tool.

Background

In the production of electric tools, safety is the most basic and important performance index for checking whether electric tools can be normally put on the market. In the safety regulations for electric power tools, various safety requirements are involved, for example, safety requirements for switch control circuits.

In order to improve the safety of the electric tool, the prior art provides a drive control circuit switch for controlling the on/off of the electric tool, the electric tool comprises a power interface for accessing a power supply, a motor for providing power for the electric tool and a drive control circuit, the drive control circuit comprises a controller which is electrically connected with the motor and can control the working state of the motor, a first control circuit and a second control circuit are sequentially arranged between the controller and the power interface in series, a first contact switch and a first switch element are arranged on the first control circuit, a second contact switch and a second switch element are arranged on the second control circuit, the drive control circuit further comprises a charging circuit, when the power interface is accessed to the power supply and the first contact switch and the second contact switch are both switched off, the charging circuit is charged, when the power interface is accessed to the power supply, the first contact switch and the second contact switch are switched on from the off state, the charging circuit is firstly charged, then the charging circuit is discharged, and the first switch element on the first control circuit and the second switch element on the second control circuit are sequentially switched on, so as to control the working state of the motor.

However, such a drive control circuit has a problem in that: in the actual operation process, it is difficult to ensure that the two contact switches are triggered simultaneously, that is, there is a time difference between the triggering of the two contact switches. If the contact switch close to the controller is triggered first and the contact switch close to the charging circuit is triggered again, the normal starting of the tool is not influenced no matter how long the triggering time difference between the contact switch close to the controller and the contact switch close to the charging circuit is; however, if the contact switch close to the charging circuit is triggered before the contact switch close to the controller, and the triggering interval time between the two is greater than the preset value, the electric quantity stored in the charging circuit is discharged within the interval time within the time difference, and at this time, even if the contact switch close to the controller is triggered again, the switch element in the second control circuit cannot be conducted, so that the controller cannot be powered on, and the motor cannot work.

Therefore, there is a need for a power tool to solve the technical problem of the controller being unable to power up due to the above reasons.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric tool can guarantee behind two closed contact switches that the controller can go up the electricity smoothly.

To achieve the purpose, the utility model adopts the following technical proposal:

a power tool, comprising:

the power interface is used for accessing a power supply;

a motor for providing power to the power tool;

the controller is at least connected with the motor so as to control the working state of the motor;

the multi-path control circuit comprises a contact switch triggered by a user and a switch element electrically connected with the contact switch;

the multiplex control circuit at least comprises:

a first control circuit including a first contact switch and a first switching element;

a second control circuit including a second contact switch and a second switching element;

the second contact switch is mechanically linked with the first contact switch;

the controller is configured to:

and when the first switch element and the second switch element are conducted according to a preset conduction sequence, controlling the motor to rotate.

As an implementable solution, the preset turn-on sequence includes:

the first contact switch and the second contact switch are simultaneously conducted; or

The second contact switch is firstly conducted; or

And the second contact switch is conducted within the preset time after the first contact switch is conducted.

As an implementation scheme, the electric tool further comprises a pressing component and a triggering component, wherein the triggering component is movably connected with the shell of the electric tool and has a first position and a second position, and when the triggering component is located at the first position, the triggering component presses the pressing component so that the pressing component presses and triggers the first contact switch and the second contact switch; when the trigger component is located at the second position, the pressing component is disconnected with the first contact switch and the second contact switch respectively.

As an implementable solution, the first contact switch includes a first mounting seat and a first contact arranged on the first mounting seat, and the second contact switch includes a second mounting seat and a second contact arranged on the second mounting seat;

the pressing assembly comprises a first elastic sheet and a second elastic sheet, one end of the first elastic sheet is connected with the first mounting seat, the other end of the first elastic sheet extends to the position above the first contact, one end of the second elastic sheet is connected with the second mounting seat, and the other end of the second elastic sheet extends to the position above the second contact;

the trigger assembly is used for extruding one end of the pressing assembly to be an extruding end, and the first contact and the second contact are arranged in a staggered mode relative to the extruding end, so that the distances between the first contact and the second contact and the extruding end are unequal respectively.

As an implementation solution, the first contact switch includes a first mounting seat and a first contact disposed on the first mounting seat, the second contact switch includes a second mounting seat and a second contact disposed on the second mounting seat, and the first contact and the second contact are disposed flush;

the pressing assembly comprises a first elastic sheet and a second elastic sheet, one end of the first elastic sheet is connected with the first mounting seat, the other end of the first elastic sheet extends to the position above the first contact, one end of the second elastic sheet is connected with the second mounting seat, and the other end of the second elastic sheet extends to the position above the second contact;

the trigger assembly is used for extruding one end of the pressing assembly and is provided with a first abutting portion and a second abutting portion, the first abutting portion and the second abutting portion are respectively used for abutting against the first elastic sheet and the second elastic sheet, the second abutting portion protrudes out of the first abutting portion in the direction close to the corresponding contact, and therefore the distance between the first contact and the first abutting portion is unequal to the distance between the second contact and the second abutting portion.

As an implementable scheme, the pressing assembly includes a pressing piece and two first elastic pieces, one of the first elastic pieces elastically abuts between the first contact switch and the pressing piece, and the other first elastic piece elastically abuts between the second contact switch and the pressing piece;

the second contact switch protrudes from the first contact switch along a direction close to the pressing piece.

As an implementable aspect, the pressing assembly includes:

the body part is movably connected with the shell, the trigger assembly can extrude the first end of the body part, and the first contact switch and the second contact switch are arranged in a flush mode relative to the body part;

two first elastic pieces, one of which is elastically pressed between the first contact switch and the body part, and the other of which is elastically pressed between the second contact switch and the body part;

the first pressing end and the second pressing end are respectively used for pressing the first contact switch and the second contact switch, and the second pressing end protrudes out of the first pressing end along the direction close to the corresponding contact switch.

As an implementable scheme, the electric tool further comprises an elastic resetting piece, two ends of the elastic resetting piece are respectively abutted with the shell and the trigger assembly, and the trigger assembly always has a tendency of being located at the second position.

As an implementable scheme, the triggering component is provided with a guiding part, the guiding part extends along a connecting line direction of the first position and the second position, and the elastic resetting piece is sleeved on the guiding part.

As an implementation solution, the trigger assembly includes an operating part and a connecting part, which are connected with each other, the operating part is disposed outside the housing, and the connecting part is disposed inside the housing.

The utility model discloses beneficial effect does:

the utility model discloses an electric tool sets up the mode into mechanical linkage through with first contact switch and second contact switch to make first contact switch and second contact switch on in proper order in order predetermineeing, thereby can make the electric tool who adopts to have the binary channels switch have stable switching performance, avoid appearing the condition emergence that influence such as start inefficacy used experience.

Drawings

Fig. 1 is a circuit block diagram of an electric tool according to a first embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of an electric tool according to a first embodiment of the present invention;

fig. 3 is a schematic partial structural view of an electric tool according to a first aspect of the present invention;

fig. 4 is an exploded schematic structural diagram of a partial structure of an electric tool according to a first aspect of the present invention;

fig. 5 is an exploded schematic structural diagram of a partial structure of an electric tool according to a second embodiment of the present invention;

fig. 6 is a schematic partial structure view of an electric tool according to a second embodiment of the present invention;

fig. 7 is a schematic structural diagram of an elastic conductive component according to a first aspect provided in an embodiment of the present invention;

fig. 8 is an exploded schematic structural diagram of an elastic conductive component according to a second embodiment of the present invention.

In the figure:

10-a power interface; 20-a motor; 30-a controller; 40-a multi-way control circuit; 401 — a first control circuit; 402-a second control circuit; 50-a charging circuit; 60-a housing;

11-a first contact switch; 111-a first mount; 112-a first contact; 12-a second contact switch; 121-a second mount; 122-a second contact;

2-a pressing assembly; 211-a first elastic sheet; 212-a second spring; 22-a press; 221-a body portion; 2221-first pressing end; 2222-second pressing end; 223-a second elastic member; 23-a first elastic member;

3-a trigger component; 31-an operating member; 32-a connector; 321-a pressing end; 3221-a first pressing part; 3222-a second pressing part; 323-a guide;

4-elastic restoring piece.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

The utility model discloses electric tool includes but not limited to: various ac or dc tools such as electric drills, circular saws, sanding machines with reciprocating saws, snow blowers, hair dryers, etc., other types of electric tools may fall within the scope of the present invention as long as the essence of the technical solution disclosed below can be adopted.

As shown in fig. 1, the electric tool at least includes a power interface 10, a motor 20, a controller 30, a multi-way control circuit 40 and a charging circuit 50, wherein the multi-way control circuit 40 at least includes a first control circuit 401 and a second control circuit 402, and the first control circuit 401, the second control circuit 402 and the controller 30 are sequentially connected in series.

The power interface 10 is used for accessing a power supply. In one embodiment, the power source accessed by the power interface 10 may be ac mains. In one embodiment, the power source accessed by the power interface 10 may be a battery pack, and the battery pack may be composed of a group of battery units, for example, the battery units may be connected in series to form a single power branch, forming a 1P battery pack. The power voltage received by the power interface 10 can power up the controller 30, so that the controller 30 can output a control signal to control the rotation state of the motor 20, for example, to control the motor 20 to start, rotate or stop rotating. Alternatively, if the power voltage is higher, the power conversion circuit needs to convert the power voltage and then power up the controller 30. The power conversion circuit can convert the power voltage into a voltage suitable for powering on the controller 30, for example, the power voltage is 20V, and the voltage is converted into a voltage of 3V or 5V for powering on the controller 30 through the power conversion circuit.

The controller 30 can output a PWM control signal to the motor 20 to control the motor 20 to switch between different states, such as starting, changing the rotation speed, changing the direction of rotation, adjusting the rotation frequency, stopping, etc. of the motor 20. It will be appreciated that a drive circuit (not shown) is also connected between the controller 30 and the motor 20. The drive circuit has a plurality of semiconductor switching elements to switch the energization state of the motor 20. In one embodiment, the driving circuit is electrically connected to each phase of the stator winding of the motor 20 for transmitting a power current to the stator winding to drive the motor 20 to rotate. As one of the embodiments, the driving circuit may include a plurality of switching elements, for example, six switching elements. Each gate terminal of each switching element is electrically connected to the controller 30 for receiving a control signal from the controller 30. Each drain or source of the switching element is connected to a stator winding of the motor 20. The six switching elements receive control signals from controller 30 to change the respective conduction states to vary the current supplied by the power source to the stator windings of motor 20.

The multi-channel control circuit 40 includes at least a contact switch for user activation and a switching element electrically connected to the contact switch and having a certain power. In one implementation, the contact switch includes contacts a, b, and c, where the contact a is floating, when the contact switch is pressed, the contact a and c is closed, and when the contact switch is not pressed, the contact a and b is closed, and the contact switch is open. The switching elements may be controllable semiconductor power devices, such as FETs, BJTs, IGBTs, etc., or any other type of solid-state switches, such as IGBTs, BJTs, etc. In this application, the multiplex control circuit 40 can control the power-on or power-off of the controller 30, so as to control the on/off of the motor 20.

As shown in fig. 1, the electric power tool further includes a first capacitor C1, and when the power interface 10 is connected to a power supply when the contact switch in the multi-path control circuit 40 is in an off state, a charging circuit 50 formed by the power supply, the multi-path control circuit 40, and the first capacitor is turned on to charge the first capacitor C1. It should be noted that the capacity of the first capacitor C1 is small, and the full-charge state can be reached quickly. Further, when the contact switch in the multi-path control circuit 40 is triggered to be turned on, the first capacitor C1 will be discharged through the multi-path control circuit 40, so as to turn on the switch element in the multi-path control circuit 40, thereby powering on the controller 30, and the controller 30 can output a control signal to control the motor 20 to start. In particular, in order to maintain the controller 30 to continuously output the control signal, the controller 30 may further output an electrical signal POWER to charge the first capacitor C1. Alternatively, an external power source may be used to generate the electrical signal for charging the first capacitor C1. Further, during the process that the controller 30 outputs the control signal to control the operation of the motor 20, the controller 30 may detect the voltage signal of the contact switch in real time to determine whether the switch is turned off. If the switch is turned off, the controller 30 outputs a control signal to stop the motor 20. It will be appreciated that even if the controller 30 fails to detect a switch open signal, the multiplexed control circuit 40 will no longer provide power to the controller 30 due to the switch being open, and the controller 30 will not be able to output a control signal due to a loss of power to effect a shutdown of the motor 20. That is, the safety of the tool shutdown operation can be ensured in the event of a failure of the controller 30 by the multiplexing control circuit 40 including the contact switch provided in the present application.

It will be appreciated that during use of the power tool, there may be situations where the power tool is de-energized due to the power interface 10 becoming loose or the user simply unplugging the power source to de-energize the tool, but not opening the contact switch. In this case, when the user switches on the power supply next time, the tool is directly started because the contact switch is in the closed state, thereby bringing about a potential safety hazard. Therefore, in order to avoid the above situation, the present application provides the first capacitor C1, and as shown in fig. 1, the first capacitor C1 and at least the first contact switch 11 constitute the charging circuit 50. When the power interface 10 is connected to a power source and the first contact switch 11 is in an off state, the charging circuit 50 is turned on, and the power source can charge the first capacitor C1; when the first contact switch 11 is in the closed state and the power interface 10 is connected to the power supply, the charging circuit 50 is not turned on, and the first capacitor C1 is not charged. That is, when the contact switch is in the closed state, the tool is powered on, and the first capacitor C1 is not charged, i.e., not discharged, so that the switch element in the multi-path control circuit 40 is not turned on, and the controller 30 cannot be powered on. And the motor 20 cannot be started, avoiding the safety problem caused by switching on the power supply when the contact switch is closed.

In this embodiment, to further enhance the safety of the tool shutdown control. The multiplexing control circuit 40 shown in fig. 3 and 4 may include at least two control circuits, such as a first control circuit 401 and a second control circuit 402, but may also include more control circuits. In this embodiment, the first control circuit 401 and the second control circuit 402 are connected in series. By arranging at least two control circuits, when part or all of the components in one control circuit fail, the other control circuit can maintain normal power-off of the controller 30, so that normal operation of on/off of the tool is ensured, and the safety problem caused by failure of part of the components to cause that the on/off operation is not responded is avoided. It will be appreciated that the multiplexing control circuit 40 may also include three or four or more control circuits connected in series. In the present application, two control circuits connected in series are selected in consideration of requirements such as the cost of components and the heat loss of components.

In a particular implementation, as shown in fig. 1, the first control circuit 401 may include at least a first contact switch 11 and first switching elements Q1, Q3; the second control circuit 402 may include a second contact switch 12 and second switching elements Q2, Q4. The first contact switch 11 and the second contact switch 12 are both contact switches including three contacts, and when pressed, the contacts a and c are connected to the contact switches, and when not pressed, the contacts a and b are disconnected from the contact switches. In the actual use process, if the second contact switch 12 is triggered first and the first contact switch 11 is triggered again, the controller 30 can be powered on no matter how long the triggering time difference between the two is, that is, the normal starting of the tool is not affected; however, if the first contact switch 11 is triggered before the second contact switch 12, and when the time difference between the two triggered times is greater than a certain value, that is, the second contact switch 12 is not turned on for a long time, the discharge of the capacitor C1 is completed, and Q4 and Q2 are not turned on, the controller 30 cannot be powered on, and the motor 20 does not operate.

In order to solve this problem, in this embodiment, the second contact switch 12 is mechanically linked to the first contact switch 11, and the first contact switch 11 and the second contact switch 12 are switched from the off state to the on state according to the preset on sequence, so that the first switch elements Q1 and Q3, the second switch elements Q2 and Q4 are switched on according to the preset on sequence, thereby ensuring that the controller 30 is powered on, and controlling the motor 20 to rotate, so that the electric tool with the dual-channel switch has stable switching performance, and avoiding the occurrence of the situation that the use experience is affected by the power failure, power on failure, and the like.

Specifically, the preset conduction sequence includes that the first contact switch 11 and the second contact switch 12 are simultaneously conducted; or the second contact switch 12 is turned on before the first contact switch 11; or the second contact switch 12 is turned on within a preset time after the first contact switch 11 is turned on. The above conduction sequence is satisfied, and the charging circuit 50 sequentially turns on the first switching elements Q1 and Q3 and the second switching elements Q2 and Q4, so as to power on the controller 30. The preset time after the first contact switch 11 is turned on is a time before the electric quantity of the first capacitor C1 is discharged.

It is understood that the circuit in fig. 1 further includes a plurality of voltage dividing resistors and rectifying diodes, which are not described in detail herein.

The control process of the motor 20 in the present application will be described in detail with reference to fig. 1:

with regard to the process of closing the contact switch after insertion of the power supply: when the power interface 10 is connected to a power source when the first contact switch 11 and the second contact switch 12 are connected to the contacts a and b in the off state, the charging circuit 50 including the power source, the resistor R, the first contact switch 11, and the first capacitor C1 is turned on to charge the capacitor C1. Further, when the first contact switch 11 and the second contact switch 12 are closed according to the preset conduction sequence, the first capacitor C1 is discharged to turn on Q3, so that Q1 is turned on, and further Q4 and Q2 are also turned on successively, so that the multi-path control circuit 40 is turned on comprehensively. The multi-path control circuit 40 outputs an electrical signal to power the controller 30, and the controller 30 is powered and outputs a control signal to control the motor 20 to rotate. Meanwhile, the controller 30 outputs the electric signal POWER to the first capacitor C1 to continuously charge the first capacitor C1, so as to maintain the conduction of Q3, Q1, Q4, and Q2, and maintain the normal operation of the controller 30.

With regard to the process of opening the contact switch: in the normal operation process of the controller 30, the voltage signals of the first contact switch 11 and the second contact switch 12 may be detected in real time or at a certain frequency to determine whether the first contact switch 11 and the second contact switch 12 are triggered to switch from the closed state to the open state. If the controller 30 detects that the first contact switch 11 and/or the second contact switch 12 is turned off, it may output a control signal to control the motor 20 to stop rotating. In a possible case, if the controller 30 cannot effectively detect the turn-off signal of the first contact switch 11 and/or the second contact switch 12, the controller will not output the control signal to control the motor 20 to stop rotating. However, since the first contact switch 11 and the second contact switch 12 are actually turned off, the switching elements Q3, Q1, Q4, and Q2 are not turned on, the multi-path control circuit 40 does not output an electrical signal any more, the controller 30 loses power, and cannot output a control signal to control the motor 20 to continue to rotate, so that the shutdown control of the motor 20 can also be realized. In a possible case, if the first contact switch 11 or the second contact switch 12 fails, that is, one of the contact switches is damaged and cannot respond to the shutdown operation of the user, and the other contact switch is normal, the whole electric tool can be shut down. For example, the first contact switch 11 is in a long-closed state in which the contact a is always connected to the contact c, the controller 30 may control the motor 20 to stop rotating by detecting the opening signal of the second contact switch 12. In addition, even if the first contact switch 11 is in the on state after failure, the second switching elements Q2 and Q4 are turned off after the second contact switch 12 is turned off, so that the second control circuit 402 does not output any electric signal any more, the controller 30 loses power, and the motor 20 stops rotating.

In a possible case, if one of the first switching element and the second switching element fails, that is, one switching element is damaged in a state of being always on or always off, the other switching element can be normally operated. For example, if Q1 and/or Q3 fails and is always in the on state, but Q2 and/or Q4 can work normally, i.e. Q2 and/or Q4 is/are off when the second contact switch 12 is off, the controller 30 can normally output a control signal to control the motor 20 to stop rotating when detecting that the first contact switch 11 and/or the second contact switch 12 is off during the normal operation of the tool. In addition, after the second contact switch 12 is turned off, Q2 and Q4 are also turned off, so that the second control circuit 402 does not output any electric signal any more, the controller 30 is also powered off, and the motor 20 stops rotating.

In this embodiment, when the controller 30 outputs the control signal to control the motor 20 to stop rotating, the PWOER electrical signal is also stopped to stop charging the first capacitor C1.

In addition, the first control circuit 401 further includes a second capacitor C2, the second capacitor C2 is connected in parallel with the first switching element Q3, for example, one end of the second capacitor C2 is connected to the emitter of Q3, and the other end of the second capacitor C2 is connected to the base of Q3 through a voltage dividing resistor. The second capacitor C2 is fully charged in the process of closing the first contact switch 11, and after the first contact switch 11 is turned off, the first switch element Q3 can be discharged for a period of time to maintain conduction, so that Q1 is maintained to be conducted. The second control circuit 402 is further provided with a third capacitor C3, the third capacitor C3 is connected in parallel with the second switching element Q4, for example, one end of the third capacitor C3 is connected to the emitter of the second switching element Q4, and the other end of the third capacitor C3 is connected to the base of the second switching element Q4 through a divider resistor. The third capacitor C3 is fully charged in the process of closing the second contact switch 12, and after the second contact switch 12 is opened, the second power element Q4 can be discharged for a period of time to maintain conduction, so that Q2 is maintained to be conducted. That is, by setting C2 and C3, after the first contact switch 11 and the second contact switch 12 are turned off, the controller 30 may be maintained to be powered for a period of time, and the controller 30 outputs a control signal to control the motor 20 to stop rotating during the period of time. It is ensured that the controller 30 has time to perform the shutdown action after detecting the shutdown signal, i.e. detecting that the first contact switch 11 and the second contact switch 12 are turned off.

Regarding the process of plugging in the power supply after closing the contact switch: when the first contact switch 11 and the second contact switch 12 are in a closed state, i.e. the contacts a and C are connected, if the power interface 10 is connected to a power supply, the charging circuit 50 is not conductive, and thus the first capacitor C1 cannot be charged. Since the first capacitor C1 is not charged, it cannot be discharged. The multi-path control circuit 40 cannot output the electric signal, the controller 30 cannot be powered, and the motor 20 cannot be started.

In order to realize that the first contact switch 11 and the second contact switch 12 are triggered in mechanical linkage, as shown in fig. 2-4, the electric tool further comprises a housing 60, a pressing component 2 and a triggering component 3, the motor 20 and the controller 30 are all arranged in the housing 60, the triggering component 3 is movably connected with the housing 60 and has a first position and a second position, when the triggering component 3 is located at the first position, the triggering component 3 presses the pressing component 2 to deform, so that the pressing component 2 presses and triggers the first contact switch 11 and the second contact switch 12, and when the triggering component 3 is located at the second position, the pressing component 2 is disconnected with the first contact switch 11 and the second contact switch 12 respectively.

That is, in the process that the user operates the trigger assembly 3 to switch from the second position to the first position, the pressing assembly 2 can be pressed to deform, and the pressing assembly 2 presses the first contact switch 11 and the second contact switch 12 in the deformation process, so that the first contact switch 11 and the second contact switch 12 are closed, and mechanical linkage is realized. When the user releases the trigger assembly 3, the pressing assembly 2 returns to its shape to disconnect the first contact switch 11 and the second contact switch 12 and push the trigger assembly 3 from the first position back to the second position.

Preferably, as shown in fig. 3, the power tool further includes an elastic restoring member 4, and two ends of the elastic restoring member 4 respectively abut against the housing 60 and the trigger assembly 3, and make the trigger assembly 3 always have a tendency to be located at the second position. When needs trigger subassembly 3 and return to the second position, elasticity reset piece 4 can assist and press subassembly 2 and exert the motive force to trigger subassembly 3 together, guarantees to trigger subassembly 3 and gets back to the second position smoothly, and then guarantees to trigger subassembly 3 and no longer extrudees pressing subassembly 2, makes to press subassembly 2 and first contact switch 11 and the separation of second contact switch 12 smoothly, promptly for first contact switch 11 and the smooth disconnection of second contact switch 12 provide the assurance.

Further, as shown in fig. 3, the triggering component 3 is provided with a guiding portion 323, the guiding portion 323 extends along a connecting line direction of the first position and the second position, and the elastic restoring member 4 is sleeved on the guiding portion 323. The guide part 323 can guide the deformation direction of the elastic resetting piece 4, so that the acting force direction of the elastic resetting piece 4 on the trigger component 3 is along the connecting line direction of the first position and the second position, and the trigger component 3 is prevented from generating position deflection in the position switching process. In this embodiment, the guiding portion 323 is a guide pillar disposed on the trigger assembly 3, the elastic restoring member 4 is a spring, the spring is sleeved on the guide pillar, and one end of the spring abuts against the housing 60, and the other end of the spring abuts against the trigger assembly 3.

In this embodiment, the triggering component 3 enables the second contact switch 12 to be closed before the first contact switch 11, so as to ensure that the controller 30 can be smoothly powered up.

As an implementable solution, as shown in fig. 3 and fig. 4, the first contact switch 11 includes a first mounting base 111 and a first contact 112 disposed on the first mounting base 111, the second contact switch 12 includes a second mounting base 121 and a second contact 122 disposed on the second mounting base 121, the pressing component 2 includes a first elastic sheet 211 and a second elastic sheet 212, one end of the first elastic sheet 211 is connected to the first mounting base 111, the other end extends above the first contact 112, one end of the second elastic sheet 212 is connected to the second mounting base 121, the other end extends above the second contact 122, the triggering component 3 is used for pressing one end of the pressing component 2 to be a pressing end 321, and the first contact 112 and the second contact 122 are staggered with respect to the pressing end 321, so that the distance between the first contact 112 and the pressing end 321 is greater than the distance between the second contact 122 and the pressing end 321.

When a user operates the trigger assembly 3 to switch the trigger assembly 3 from the second position to the first position, the pressing end 321 presses the first elastic sheet 211 and the second elastic sheet 212 to deform, and the distance from the second contact 122 to the pressing end 321 is small, so that the second elastic sheet 212 is in contact with the corresponding contact prior to the first elastic sheet 211, even if the second contact switch 12 is closed before the first contact switch 11, the first control circuit 401 and the second control circuit 402 can be both switched on, and the controller 30 is powered on. When the first contact switch 11 and the second contact switch 12 need to be disconnected, the user does not operate the trigger assembly 3 any more, the first elastic piece 211 and the second elastic piece 212 lose the pressing force actively applied by the trigger assembly 3, and recover to the shape under the action of the elastic force thereof, so as to be disconnected from the first contact 112 and the second contact 122, and push the pressing end 321 of the trigger assembly 3, so that the trigger assembly 3 returns to the second position from the first position.

In this embodiment, as shown in fig. 3 and fig. 4, the trigger assembly 3 includes an operating element 31 and a connecting element 32 that are connected, the operating element 31 is disposed outside the housing 60, so as to be convenient for a user to operate, the connecting element 32 is disposed inside the housing 60, one end of the connecting element 32 away from the operating element 31 is a pressing end 321, the user can push the operating element 31 to slide relative to the housing 60, so that the trigger assembly 3 moves from the second position to the first position, and when the user cancels the pushing force on the operating element 31, the elastic resetting element 4, the first elastic sheet 211, and the second elastic sheet 212 jointly push the trigger assembly 3 to the second position.

The first and second mounting seats 111 and 121 are fixed in the housing 60 of the power tool, and optionally, as shown in fig. 4, the distance from the pressing end 321 to the first mounting seat 111 is greater than the distance from the pressing end 321 to the second mounting seat 121, so that the distance from the pressing end 321 to the first contact 112 is greater than the distance from the pressing end 321 to the second contact 122. Of course, in some embodiments, it is also possible that the first and second mounting seats 111 and 121 are the same distance from the pressing end 321, and only the first contact 112 is farther from the pressing end 321 than the second contact 122 is from the pressing end 321.

As another implementable solution, as shown in fig. 5, the first contact switch 11 includes a first mounting seat 111 and a first contact 112 disposed on the first mounting seat 111, the second contact switch 12 includes a second mounting seat 121 and a second contact 122 disposed on the second mounting seat 121, the first contact 112 and the second contact 122 are disposed in parallel, the pressing component 2 includes a first elastic sheet 211 and a second elastic sheet 212, one end of the first elastic sheet 211 is connected to the first mounting seat 111, and the other end extends above the first contact 112, one end of the second elastic sheet 212 is connected to the second mounting seat 121, and the other end extends above the second contact 122, the triggering component 3 is configured to press one end of the pressing component 2 and is provided with a first pressing portion 3221 and a second pressing portion 3222, the first pressing portion 3221 and the second pressing portion 3222 are respectively configured to press the first elastic sheet 211 and the second elastic sheet 212, and the second pressing portion 3222 is disposed in the first pressing portion 3221 along a direction close to the corresponding contact, so that a distance between the second pressing portion 3222 and the second contact 3221 is smaller than a distance between the first pressing portion 3221 and the second contact 112.

When the user operates the trigger assembly 3 to move the trigger assembly 3 from the second position to the first position, since the second pressing portion 3222 is closer to the corresponding elastic piece, the second pressing portion 3222 presses the corresponding elastic piece in preference to the first pressing portion 3221, so that the second elastic piece 212 contacts the corresponding contact in preference to the first elastic piece 211, that is, the second contact switch 12 is closed in preference to the first contact switch 11. When the first contact switch 11 and the second contact switch 12 need to be disconnected, the user does not operate the trigger assembly 3 any more, the first elastic piece 211 and the second elastic piece 212 lose the pressing force actively applied by the trigger assembly 3 and restore to the shape under the action of their own elastic force, so as to be disconnected from the first contact 112 and the second contact 122, and push the pressing end 321 of the trigger assembly 3, so that the trigger assembly 3 returns to the second position from the first position.

In this scheme, as shown in fig. 5, the trigger assembly 3 includes an operating element 31 and a connecting element 32 that are connected, the operating element 31 is disposed outside the housing 60, so as to facilitate user operation, the connecting element 32 is disposed inside the housing 60, the first pressing portion 3221 and the second pressing portion 3222 are disposed at one end of the connecting element 32 that is far away from the operating element 31, and a user can push the operating element 31 to slide relative to the housing 60, so that the trigger assembly 3 moves from the second position to the first position, and after the user cancels pushing force on the operating element 31, the elastic resetting element 4, the first elastic sheet 211, and the second elastic sheet 212 jointly push the trigger assembly 3 to the second position. Further, the first and second mounting seats 111 and 121 are fixed in the housing 60 of the power tool and are flush with each other, so that the first and second contacts 112 and 122 are flush with each other.

Example two

The present embodiment provides an electric tool which has the same working principle as the first embodiment, except for the specific structure of the pressing member 2.

As shown in fig. 6, the trigger assembly 3 includes an operating member 31 and a connecting member 32 connected to each other, the operating member 31 is disposed outside the housing 60 so as to facilitate user operation, the connecting member 32 is disposed inside the housing 60, a groove portion is disposed at an end of the connecting member 32 away from the operating member 31, an end of the pressing assembly 2 can be engaged with the groove portion, and when the user pushes the trigger assembly 3, the groove portion of the trigger assembly 3 can push and press the pressing assembly 2 to move toward the first contact switch 11 and the second contact switch 12.

In this embodiment, in order to ensure that the controller 30 can be successfully powered up, the triggering component 3 enables the second contact switch 12 to be closed before the first contact switch 11, so as to ensure that the controller 30 can be successfully powered up.

As an implementation solution, as shown in fig. 7, the pressing assembly 2 includes a pressing member 22 and two first elastic members 23, one first elastic member 23 elastically abuts between the first contact switch 11 and the pressing member 22, and the other first elastic member 23 elastically abuts between the second contact switch 12 and the pressing member 22, and the second contact switch 12 is disposed to protrude from the first contact switch 11 along a direction approaching to the pressing member 22, so that a distance between the pressing member 22 and the second contact switch 12 is smaller than a distance between the pressing member 22 and the first contact switch 11.

When the user operates the trigger assembly 3 to move the trigger assembly 3 from the second position to the first position, the trigger assembly 3 pushes the pressing piece 22 to move towards the contact switch, and the second contact switch 12 is pressed and closed preferentially to the first contact switch 11 due to the closer distance of the second contact switch 12 to the pressing piece 22. When the first contact switch 11 and the second contact switch 12 need to be disconnected, the user does not operate the trigger assembly 3 any more, so that the pressing assembly 2 does not actively press the first contact switch 11 and the second contact switch 12, the first elastic member 23 recovers the shape under the action of the elastic force of the first elastic member, and pushes the pressing member 22 to be disconnected with the first contact switch 11 and the second contact switch 12, so that the pressing member 22 pushes the trigger assembly 3, and the trigger assembly 3 returns to the second position from the first position under the combined action of the pressing member 22 and the elastic resetting member 4.

As another practical solution, as shown in fig. 8, the pressing assembly 2 includes a main body 221, two first elastic members 23, a first pressing end 2221 and a second pressing end 2222, the main body 221 is movably connected to the housing 60, the triggering assembly 3 can press the first end of the main body 221, the first contact switch 11 and the second contact switch 12 are flush with each other with respect to the main body 221, one first elastic member 23 elastically presses between the first contact switch 11 and the main body 221, and the other first elastic member 23 elastically presses between the second contact switch 12 and the main body 221; the first pressing end 2221 and the second pressing end 2222 are both disposed at the other end of the body part 221, the first pressing end 2221 and the second pressing end 2222 are respectively used for pressing the first contact switch 11 and the second contact switch 12, and the second pressing end 2222 is disposed to protrude from the first pressing end 2221 in a direction close to the corresponding contacts, so that the distance between the second pressing end 2222 and the second contact switch 12 is smaller than the distance between the first pressing end 2221 and the first contact switch 11.

When the user operates the trigger assembly 3 to move the trigger assembly 3 from the second position to the first position, the trigger assembly 3 pushes the body 221 to move toward the contact switch, and since the second pressing end 2222 is closer to the second contact switch 12 than the first pressing end 2221 is to the first contact switch 11, the second contact switch 12 is closed in preference to the first contact switch 11, thereby ensuring that the controller 30 is smoothly powered on. When the first contact switch 11 and the second contact switch 12 need to be disconnected, the user does not operate the trigger assembly 3 any more, so that the pressing assembly 2 does not press the first contact switch 11 and the second contact switch 12 actively any more, the first elastic member 23 recovers its shape under the action of its own elastic force and pushes the body portion 221 to disconnect from the first contact switch 11 and the second contact switch 12, so that the body portion 221 pushes the trigger assembly 3, and the trigger assembly 3 returns from the first position to the second position under the combined action of the pressing member 22 and the elastic restoring member 4.

In this solution, as shown in fig. 8, an accommodating cavity is formed in the body portion 221, and the first pressing end 2221 and the second pressing end 2222 are connected and disposed in the accommodating cavity. Preferably, the pressing assembly 2 further includes two second elastic members 223, the second elastic members 223 are disposed in the accommodating cavity, one second elastic member 223 elastically abuts between the bottom of the accommodating cavity and the first pressing end 2221, the other second elastic member 223 elastically abuts between the bottom of the accommodating cavity and the second pressing end 2222, and by disposing the second elastic members 223, the pressing forces of the first pressing end 2221 and the second pressing end 2222 on the first contact switch 11 and the second contact switch 12 are made softer, and the risk of damage to the first contact switch 11 and the second contact switch 12 is reduced. In this embodiment, the second elastic member 223 may be a spring.

Obviously, the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and for those skilled in the art, there are variations on the specific embodiments and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (9)

1. A power tool, comprising:

the power interface (10) is used for accessing a power supply;

a motor (20) for powering the power tool;

a controller (30) connected to at least the motor (20) to control an operating state of the motor (20);

a multi-way control circuit (40) comprising a contact switch for user triggering and a switch element electrically connected with the contact switch;

it is characterized in that the preparation method is characterized in that,

the multiplexing control circuit (40) comprises at least:

a first control circuit (401) including a first contact switch (11) and a first switching element;

a second control circuit (402) comprising a second contact switch (12) and a second switching element;

the second contact switch (12) is mechanically linked with the first contact switch (11);

the controller (30) is configured to:

when the first switching element and the second switching element are conducted according to a preset conduction sequence, the motor (20) is controlled to rotate;

the electric tool further comprises a pressing component (2) and a triggering component (3), wherein the triggering component (3) is movably connected with the shell (100) of the electric tool and has a first position and a second position, when the triggering component (3) is located at the first position, the triggering component (3) presses the pressing component (2) so that the pressing component (2) presses and triggers the first contact switch (11) and the second contact switch (12); when the trigger component (3) is located at the second position, the pressing component (2) is disconnected with the first contact switch (11) and the second contact switch (12) respectively.

2. The power tool of claim 1, wherein the predetermined turn-on sequence comprises:

the first contact switch (11) and the second contact switch (12) are turned on simultaneously; or

The second contact switch (12) is firstly conducted; or

And the second contact switch (12) is conducted within the preset time after the first contact switch (11) is conducted.

3. The power tool according to claim 1, wherein the first contact switch (11) includes a first mounting seat (111) and a first contact (121) provided on the first mounting seat (111), and the second contact switch (12) includes a second mounting seat (112) and a second contact (122) provided on the second mounting seat (112);

the pressing assembly (2) comprises a first elastic sheet (211) and a second elastic sheet (212), one end of the first elastic sheet (211) is connected with the first mounting seat (111), the other end of the first elastic sheet extends to the position above the first contact (121), one end of the second elastic sheet (212) is connected with the second mounting seat (112), and the other end of the second elastic sheet extends to the position above the second contact (122);

one end, used for extruding the pressing component (2), of the trigger component (3) is an extruding end (321), and relative to the extruding end (321), the first contact (121) and the second contact (122) are arranged in a staggered mode, so that the distances between the first contact (121) and the second contact (122) and the extruding end (321) are unequal.

4. The power tool according to claim 1, characterized in that the first contact switch (11) comprises a first mounting seat (111) and a first contact (121) arranged on the first mounting seat (111), the second contact switch (12) comprises a second mounting seat (112) and a second contact (122) arranged on the second mounting seat (112), and the first contact (121) and the second contact (122) are arranged flush;

the pressing assembly (2) comprises a first elastic sheet (211) and a second elastic sheet (212), one end of the first elastic sheet (211) is connected with the first mounting seat (111), the other end of the first elastic sheet extends to the position above the first contact (121), one end of the second elastic sheet (212) is connected with the second mounting seat (112), and the other end of the second elastic sheet extends to the position above the second contact (122);

the trigger component (3) is provided with a first pressing part (3221) and a second pressing part (3222) at one end for pressing the pressing component (2), the first pressing part (3221) and the second pressing part (3222) are respectively used for pressing the first elastic piece (211) and the second elastic piece (212), and the second pressing part (3222) protrudes out of the first pressing part (3221) along a direction close to the corresponding contact, so that the distance between the first contact (121) and the first pressing part (3221) is unequal to the distance between the second contact (122) and the second pressing part (3222).

5. The power tool according to claim 1, wherein the pressing assembly (2) comprises a pressing member (22) and two first elastic members (23), one of the first elastic members (23) elastically presses between the first contact switch (11) and the pressing member (22), and the other of the first elastic members (23) elastically presses between the second contact switch (12) and the pressing member (22);

the second contact switch (12) is arranged to protrude from the first contact switch (11) in a direction approaching the pressing member (22).

6. The power tool according to claim 1, characterized in that the pressing assembly (2) comprises:

the body part (221) is movably connected with the shell (100), the trigger assembly (3) can extrude the first end of the body part (221), and the first contact switch (11) and the second contact switch (12) are arranged in a flush mode relative to the body part (221);

two first elastic pieces (23), one first elastic piece (23) elastically presses against between the first contact switch (11) and the body part (221), and the other first elastic piece (23) elastically presses against between the second contact switch (12) and the body part (221);

the first pressing end (2221) and the second pressing end (2222) are both arranged at the other end of the body portion (221), the first pressing end (2221) and the second pressing end (2222) are respectively used for pressing the first contact switch (11) and the second contact switch (12), and the second pressing end (2222) protrudes out of the first pressing end (2221) along the direction close to the corresponding contact switch.

7. The power tool according to any one of claims 1 to 6, characterized in that it further comprises an elastic return member (4), the two ends of said elastic return member (4) respectively abutting against said housing (100) and said trigger assembly (3) and always having a tendency of said trigger assembly (3) to be in said second position.

8. The power tool according to claim 7, characterized in that the trigger assembly (3) is provided with a guide portion (323), the guide portion (323) extends along a direction connecting the first position and the second position, and the elastic restoring member (4) is sleeved on the guide portion (323).

9. The power tool according to any one of claims 1 to 6, wherein the trigger assembly (3) comprises an operating member (31) and a connecting member (32) connected, the operating member (31) being disposed outside the housing (100) and the connecting member (32) being disposed inside the housing (100).

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