CN109842331A - Electric tool - Google Patents
Electric tool Download PDFInfo
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- CN109842331A CN109842331A CN201711227368.1A CN201711227368A CN109842331A CN 109842331 A CN109842331 A CN 109842331A CN 201711227368 A CN201711227368 A CN 201711227368A CN 109842331 A CN109842331 A CN 109842331A
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- motor
- current
- current value
- control device
- electric
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- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
The present invention relates to electric tools, the electric tool has reversion automatic stop function, the electric tool is in the case where moving back fastener gear (8), after operator triggers main switch (SW1), control device (4) receives the setting from forward-reverse switch (SW2) and the current value from current detection means (10) acquisition, when motor reversal, compared with the pre-set current value that the current value is stored in advance in control device (4) with one, if the current value is constantly less than pre-set current value in a predetermined time, motor supply electric current is turned off.Since during fastener is moved back in reversion, when fastener not yet completely disengages workpiece surface, tool will be automatically stopped work, to effectively prevent falling for fastener.
Description
[technical field]
The present invention relates to electric tools, in particular to a kind of to have the electric tool for moving back fastener function.
[background technique]
Currently, electric tool on the market, such as screwdriver, impact wrench remove non-operator when fastener is moved back in reversion
Trigger is unclamped, current of electric is cut off, electric tool can just stop operating, and otherwise electric tool can be rotated ceaselessly.It causes in this way
As a result, during moving back fastener, if turning off trigger not in time, fastener is non-since the revolving speed of tool usually compares comparatively fast
It is often easy to be unclamped and fallen by rotation.Especially in the case where high altitude operation, for example operator carries out moving back spiral shell on scaffold
When bolt operates, bolt is very easy to fall, and is easy to hurt sb.'s feelings when the bolt fallen is from falling from high altitude, while being also easily lost, need
The bolt etc. more renewed again, this brings many inconvenience to operator.
[summary of the invention]
To solve the above problems, the present invention provides a kind of electric tool for having and moving back fastener automatic stop function.
The invention provides the following technical scheme: electric tool includes: shell；Positioned at the intracorporal motor of the shell, control dress
It sets；Power supply is connect with the motor, for supplying the current of electric；Forward-reverse switch is connect with the control device, is used for
Control the direction of rotation of the motor；Current detection means is separately connected with the motor and the control device, for detecting
The current of electric；Mode selector is connect with the control device, and the mode selector, which at least has, moves back fastening
Part gear；It is described move back fastener gear under, the control device, which has, receives signal be arranged from forward-reverse switch, preparatory
It is stored in the preset current value for moving back fastener in control device and receives the current value that the current detection means acquisition provides,
When motor reversal, control device is by the current value and the preset current value ratio being stored in advance in control device
Compared with, if the current value in a predetermined time constantly be less than pre-set current value, turn off motor supply electric current.
Further improved scheme has, and the current detection means is a resistive element.
Further improved scheme has, and the motor is brushless motor.
Further improved scheme has, the mode selector, further includes a low torque gear and a high torque
Gear.
Further improved scheme has, and further includes the display device at the exhibition angle of shell, and the display device includes
At least two light emitting diodes, a variety of different modes for providing electric tool visually indicate.
Another technical solution provided by the invention are as follows: electric tool can be used for exiting fastener, which includes:
Shell；Positioned at the intracorporal motor of the shell, control device；Power supply is connect with the motor, for supplying the current of electric；Just
Reversal switch is connect with the control device, for controlling the direction of rotation of the motor；Current detection means and the motor
And the control device is separately connected, for detecting the current of electric；The control device has one preset to move back fastener
Current value and receive from the current detection means acquisition provide current value, when forward-reverse switch is switched to reversion,
The current value that control device provides current detection means is compared with the pre-set current value in control device, if the current value exists
Constantly it is less than the pre-set current value in a predetermined time, then turns off motor supply electric current.
Further improved scheme has, and the current detection means is a resistive element.
Further improved scheme has, and the motor is brushless motor.
Since tool is during fastener is moved back in reversion, may determine that by current detection means move back fastener into
Journey, and the supply electric current for timely cutting off motor is unscrewed when operator carries out moving back fastener operation when fastener is inverted
When, electric tool will be automatically stopped rotation, and fastener can't fall off from workpiece surface at this time, fall so as to avoid fastener
The risk fallen, and can effectively prevent fastener from falling off from workpiece surface release.
[Detailed description of the invention]
Fig. 1: electric tool schematic diagram of the invention；
Fig. 2: the mode selector and display device schematic diagram of the first embodiment of the present invention；
Fig. 3: the circuit block diagram of the first embodiment of the present invention；
Fig. 4: the circuit diagram of the first embodiment of the present invention；
Fig. 5: in the prior art, when electric tool moves back fastener, current curve schematic diagram；
Fig. 6: when electric tool of the invention moves back fastener, current curve schematic diagram；
Fig. 7: the circuit block diagram of the second embodiment of the present invention；
Fig. 8: the circuit diagram of the second embodiment of the present invention.
[specific embodiment]
Below in conjunction with attached drawing, specific description is done to the embodiment of the present invention.
Embodiment one:
With reference to attached drawing 1 and attached electric tool shown in Fig. 3, which mainly includes shell 1, is located at the intracorporal electricity of shell
Machine (not shown), the work head 2 being driven by motor, the battery pack 3 as power supply connecting with tool body control motor
Starting/stopping main switch SW1 and a controller MCU4, controller MCU4 can receive main switch SW1, forward-reverse switch SW2, mould
Formula selects the signal of switch SW3 and current detecting unit 10, and control motor executes corresponding movement accordingly.
With reference to shown in attached drawing 3 and attached drawing 4, there are three types of operation range, low torque gears 6, high torque shelves altogether for the electric tool
7 and move back fastener gear 8 in position.Operator, can be in three kinds of works by the mode selection switch SW3 of pressing mode selector 9
Make to switch between gear, by the LED light of display device 13, operator can know its selected operation range, described
Display device 13 is arranged at the exhibition angle 12 of tool body handle.For example, when operator selectes low torque gear 6, it is corresponding
The indicator light LED1 of display device 13 shines；When selected high torque gear 7, corresponding 13 indicator light LED2 of display device hair
Light；Selected when moving back fastener gear 8, the indicator light LED3 of corresponding display device 13 shines.
Under low torque gear 6 or high torque gear 7, after operator triggers main switch SW1, (in figure not with brushless motor
Show) for, brushless motor starts turning under the driving of driving circuit 11, and controller MCU4 can be by adjusting output electric current
Duty ratio adjusts the revolving speed and torque of the brushless motor.And under the gear, unless main switch SW1 is disconnected or 3 electricity of battery pack
It can exhaust, otherwise brushless motor can continue the driving output of work head 2.
In the case where moving back fastener gear 8, after operator triggers main switch SW1, brushless motor is under the driving of driving circuit 11
It starts turning, if forward-reverse switch SW2 is in forward position, controller MCU4 is adjusted by adjusting the duty ratio of output electric current
Save the revolving speed and torque of brushless motor.If forward-reverse switch SW2 is in backward position, current detecting unit 10 detects motor
Electric current, controller MCU4 receive the motor current value of the detection, and by it compared with pre-set current value, if the current of electric
Value is constantly less than pre-set current value within the predetermined time, and controller MCU4 then cuts off motor power, and electric tool stops turning
It is dynamic.Wherein, the scheduled time is pre-stored in controller MCU4, it is preferred that the scheduled time is less than 1s；Described
Pre-set current value is the motor current value during moving back fastener, and is stored in advance in controller MCU4, the current detecting
Unit 10 can be a current sampling resistor R1.
In moving back fastener operation, motor working current curve in the prior art is as shown in figure 5, main switch is pressed, electricity
Electromechanical stream becomes larger, and as fastener is gradually loosened, current of electric is gradually reduced, and when fastener is screwed out completely, leaves
When workpiece, motor working current is almost close to no-load current value, and operator cuts off main switch in t2, under current of electric is quick
Drop, becomes zero, tool stops operating in t3.Compared with prior art, electric tool of the invention is during moving back fastener
Motor working current curve as shown in fig. 6, main switch SW1 is pressed, current of electric becomes larger, as fastener is gradually revolved
Pine, current of electric gradually become smaller, when current of electric within the predetermined time, in t1 to the t2 period as shown in Figure 5, constantly
When less than pre-set current value, t1 to the t2 period is less than 1s.Fastener at this time is not yet back-outed completely leaves workpiece surface, control
Device MCU4 processed has just cut off current of electric, and electric current quickly declines, and becomes zero in the t3 time, is fastening so as to cause electric tool
Part is not unscrewed to leave completely stops work before workpiece surface.Wherein pre-set current value is one greater than empty load of motor electric current
The value of value is preferably set to 5 times to 8 times of empty load of motor current value.
Embodiment two:
Referring to shown in attached drawing 7 and attached drawing 8, compared with embodiment one, in example 2, there is no mode choosings for electric tool
Device and display device are selected, other are basically the same as the first embodiment.Operator triggers main switch SW1 and connects motor power, control
Device MCU14 receives the signal of main switch SW1, forward-reverse switch SW2, if forward-reverse switch SW2 is in forward position, control
Device MCU14 adjusts the output torque and revolving speed of brushless motor by adjusting the duty ratio of output electric current, if forward-reverse switch SW2
When in backward position, controller MCU14 receives the sampled current value from current detecting unit 20, and by the current value and in advance
The pre-set current value pre-existed in controller MCU14 compares, if the motor current value is constantly less than within the predetermined time
Pre-set current value, controller MCU14 then cut off brushless motor power supply, and electric tool just stops operating.The current detecting unit
20 can be a current sampling resistor R1.The current curve that fastener is moved back in reversion can refer to attached drawing 6.Wherein the scheduled time is preparatory
It is stored in the controller MCU14, the preferred scheduled time is less than 1s.The pre-set current value is during moving back fastener
Motor current value, and be stored in advance in the controller MCU14, be a value for being greater than empty load of motor current value, preferably
It is set as 5 times to 8 times of empty load of motor current value.
Claims (8)
1. electric tool, comprising:
Shell (1)；Positioned at the intracorporal motor of the shell, control device (4)；Power supply is connect with the motor, described for supplying
Current of electric；Forward-reverse switch (SW2) is connect with the control device (4), for controlling the direction of rotation of the motor；Electric current
Detection device (10) is separately connected with the motor and the control device (4), for detecting the current of electric；Model selection
Device (9) is connect with the control device (4), and the mode selector, which at least has, moves back fastener gear (8)；
It is characterized by: it is described move back fastener gear (8) under, the control device (4) have receive come from forward-reverse switch
(SW2) signal that is arranged is stored in advance in control device (4) a preset current value for moving back fastener and receives the electric current
The current value that detection device (10) acquisition provides, when motor reversal, control device (4) deposits the current value with described in advance
The preset current value ratio in control device (4) is stored up compared with if the current value is constantly less than in advance in a predetermined time
If current value, then motor supply electric current is turned off.
2. electric tool according to claim 1, which is characterized in that the current detection means is a resistive element
(R1)。
3. electric tool according to claim 2, which is characterized in that the motor is brushless motor.
4. electric tool according to any one of claims 1 to 3, which is characterized in that the mode selector
It (9), further include a low torque gear (6) and a high torque gear (7).
5. electric tool according to claim 4, which is characterized in that further include the display of at the exhibition angle of shell (12)
Device (13), the display device include at least two light emitting diodes (LED), for providing a variety of different moulds of electric tool
Formula visually indicates.
6. electric tool can be used for exiting fastener, which includes:
Shell (1)；Positioned at the intracorporal motor of the shell, control device (4)；Power supply is connect with the motor, described for supplying
Current of electric；Forward-reverse switch (SW2) is connect with the control device (4), for controlling the direction of rotation of the motor；Electric current
Detection device (20) is separately connected with the motor and the control device (4), for detecting the current of electric；
It is characterized by: the control device (14), which has a preset current value for moving back fastener and receives, comes from the electric current
The current value that detection device (20) acquisition provides, when forward-reverse switch is switched to reversion, control device (14) is by current detecting
The current value that device (20) provides is compared with the pre-set current value in control device (14), if the current value is when one is scheduled
It is interior to be constantly less than the pre-set current value, then turn off motor supply electric current.
7. electric tool according to claim 6, which is characterized in that the current detection means (20) is a resistive element
R1。
8. electric tool according to claim 7, which is characterized in that the motor is brushless motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711227368.1A CN109842331A (en) | 2017-11-29 | 2017-11-29 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711227368.1A CN109842331A (en) | 2017-11-29 | 2017-11-29 | Electric tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109842331A true CN109842331A (en) | 2019-06-04 |
Family
ID=66882150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711227368.1A Pending CN109842331A (en) | 2017-11-29 | 2017-11-29 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109842331A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024147A (en) * | 2019-12-26 | 2020-04-17 | 玳能科技(杭州)有限公司 | Component mounting detection method and device based on CNNs, electronic equipment and storage medium |
| CN112706131A (en) * | 2019-10-25 | 2021-04-27 | 南京德朔实业有限公司 | Electric tool |
| WO2024046498A1 (en) * | 2022-08-30 | 2024-03-07 | 江苏东成工具科技有限公司 | Electric tool and control method |
-
2017
- 2017-11-29 CN CN201711227368.1A patent/CN109842331A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112706131A (en) * | 2019-10-25 | 2021-04-27 | 南京德朔实业有限公司 | Electric tool |
| CN111024147A (en) * | 2019-12-26 | 2020-04-17 | 玳能科技(杭州)有限公司 | Component mounting detection method and device based on CNNs, electronic equipment and storage medium |
| WO2024046498A1 (en) * | 2022-08-30 | 2024-03-07 | 江苏东成工具科技有限公司 | Electric tool and control method |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190604 |
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| WD01 | Invention patent application deemed withdrawn after publication |