CN211491284U

CN211491284U - Electric screw driver

Info

Publication number: CN211491284U
Application number: CN201922288835.2U
Authority: CN
Inventors: 何德涛
Original assignee: Zhejiang Minglei Tools Industry Co ltd
Current assignee: Zhejiang Minglei Tools Industry Co ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2020-09-15
Anticipated expiration: 2029-12-18

Abstract

The utility model relates to an electric screwdriver relates to electric tool's field, and it includes drive assembly, cladding and the installation cover that constitutes by first installation shell and second installation shell on drive assembly, is provided with the first butt joint groove that runs through first installation shell on the first installation shell, is provided with the first butt joint piece that inserts in first butt joint groove on the drive assembly, is provided with the second butt joint groove that runs through the second installation shell on the second installation shell, is provided with the second butt joint piece that inserts in second butt joint groove on the drive assembly. The utility model discloses have the effect that improves electric screwdriver life.

Description

Electric screw driver

Technical Field

The utility model belongs to the technical field of electric tool's technique and specifically relates to an electric screwdriver is related to.

Background

An electric screwdriver, also known as a screwdriver or an electric screwdriver, is an electric tool for screwing and unscrewing screws.

As shown in the attached drawing 1, the existing screwdriver comprises a battery component 1 and a driving component 2, an installation sleeve 5 is detachably installed on the battery component 1 and the driving component 2 and comprises a first installation shell 3 and a second installation shell 4, a handle shell 6 is sleeved on the installation sleeve 5, when the screwdriver is actually installed, the battery component 1 and the driving component 2 are wrapped and fixed by the installation sleeve 6, and the electric screwdriver can be operated by opening a switch.

The above prior art solutions have the following drawbacks: battery pack and drive assembly are fixed through the parcel of installation cover, because electric screwdriver can take place vibrations at the motor of in the actual working time drive assembly, long-time vibrations easily lead to battery pack and drive assembly to take place the shake, can cause battery pack internal connection bad even when serious to cause the condition of electric screwdriver inoperative to take place, lead to electric screwdriver's life to descend, there is the space of improvement in addition.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electronic screw thread sword, the difficult emergence shake of electric screwdriver during operation improves electric screwdriver's life to prior art exists.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:

the utility model provides an electric screwdriver, includes drive assembly, cladding and the installation cover that constitutes by first installation shell and second installation shell on drive assembly, be provided with the first butt groove that runs through first installation shell on the first installation shell, be provided with the first butt piece that inserts in first butt groove on the drive assembly, be provided with the second butt groove that runs through the second installation shell on the second installation shell, be provided with the second butt piece that inserts in second butt groove on the drive assembly.

Through adopting above-mentioned technical scheme, first butt groove and the cooperation of first butt piece looks butt, second butt groove and second butt piece are mutually supported for after drive assembly installs on the installation cover, owing to receive the butt effect in first butt groove and second butt groove, the difficult emergence of motor in the drive assembly when rotating is rocked, improves the stability of drive assembly installation, thereby improves drive assembly's life.

The present invention may be further configured in a preferred embodiment as: the battery pack is fixedly connected with a butt plate, a first limiting plate which is abutted and limited with the butt plate is integrally arranged on the first mounting shell, and a second limiting plate which is abutted and limited with the butt plate is integrally arranged on the second mounting shell;

the battery pack mounting structure is characterized in that a first limiting half ring which is abutted and limited with a battery pack is arranged on the first mounting shell, and a second limiting half ring which is abutted and limited with the battery pack and is matched with the first limiting half ring is arranged on the second mounting shell.

By adopting the technical scheme, the first limiting plate and the second limiting plate are matched with each other, and after the battery assembly is wrapped by the first mounting shell and the second mounting shell, the first limiting plate and the second limiting plate are abutted against the abutting plate, so that the battery assembly cannot shake in the mounting sleeve, the mounting stability of the battery assembly is improved, and the service life of the battery assembly is prolonged; after first installation shell and second installation are installed on battery pack, first spacing semi-ring was mutually supported with the spacing semi-ring of second, was encircleed battery pack to at the in-process that electric screwdriver used, can prevent that battery pack from taking place to rock between first installation shell and second installation shell, further improve battery pack's installation stability, thereby further improve battery pack's life.

The present invention may be further configured in a preferred embodiment as: a plurality of limiting pieces are integrally arranged on two side edges of the first installation shell, the limiting pieces stretch out in the direction perpendicular to the side edges of the first installation shell and towards the second installation shell, and limiting grooves for the limiting pieces to insert into the limiting grooves are formed in the second installation shell.

Through adopting above-mentioned technical scheme, first installation shell and second installation shell install the in-process on battery pack and drive assembly, and spacing piece can insert to the spacing groove, after spacing piece inserted to the spacing groove, first installation shell and second installation shell are owing to receive the limiting displacement of spacing piece and spacing groove to relative displacement can not take place, thereby improve the stability of first installation shell and second installation shell installation.

The present invention may be further configured in a preferred embodiment as: one side an organic whole that first installation shell was kept away from to spacing piece is provided with the fixed block, set up on the second installation shell and supply the fixed orifices that the fixed block joint was fixed and communicate each other with the spacing groove.

Through adopting above-mentioned technical scheme, after spacing piece inserts to the spacing inslot, the fixed block can the joint to the fixed orifices in, through the joint of fixed block and fixed orifices for first installation shell and second installation shell receive difficult separation after the joint effect of fixed block and fixed orifices, improve the stability of first installation shell and second installation shell installation.

The present invention may be further configured in a preferred embodiment as: the integrative butt post that is provided with on the first installation shell, the side of the perpendicular first installation shell of butt post stretches out to the direction of second installation shell, be provided with on the second installation shell with butt post butt complex butt hole.

Through adopting above-mentioned technical scheme, butt post and butt hole mutually support, after first installation shell lock is on the second installation shell, the butt post can stretch to the butt hole in for first installation shell and second installation shell receive the limiting displacement of butt post and can not take place relative displacement, further improve the stability of first installation shell and second installation shell installation.

The present invention may be further configured in a preferred embodiment as: the one end that battery pack was kept away from to drive assembly is fixed with fixed cover through the bolt, one side that fixed cover contradicted with the handle shell is provided with spacing lug, be provided with on the handle shell with spacing recess of contradicting with spacing lug spacing.

Through adopting above-mentioned technical scheme, spacing lug and spacing recess are mutually supported for relatively fixed between handle shell and the installation of fixed cover, and fixed cover passes through the bolt fastening on drive assembly, thereby realizes the relatively fixed between drive assembly and the handle shell, thereby further improves the stability of drive assembly installation.

The present invention may be further configured in a preferred embodiment as: and a dustproof cover is arranged on one side of the fixed sleeve, which is far away from the driving component.

Through adopting above-mentioned technical scheme, the setting of shield can avoid external dust to enter into the inside of air for the inside drive assembly and the battery pack of electric screwdriver do not receive the interference of dust, improve drive assembly and battery pack's life, thereby improve electric screwdriver's life.

The present invention may be further configured in a preferred embodiment as: one side of the dustproof cover close to the fixed sleeve is integrally provided with a plurality of connecting columns, and the fixed sleeve is provided with connecting holes for the connecting columns to be inserted and fixed and to be in one-to-one correspondence with the connecting columns.

Through adopting above-mentioned technical scheme, when sheatheeing the shield installation to fixed, only need insert the spliced pole on the shield to the connecting hole in, can fix the shield and sheathe in fixed, convenient operation improves the efficiency of shield installation.

The present invention may be further configured in a preferred embodiment as: further comprising:

a switching device which is arranged on the battery assembly and converts the pressing physical quantity into a switching signal;

the delay trigger device is coupled with the switch device to receive the switch signal and delay and output the delay trigger signal;

the comparison device is coupled with the delay trigger device to receive the delay trigger signal and output a comparison signal;

a reference device coupled to the comparison device for providing a reference signal to the comparison device;

the self-locking device is coupled with the comparison device to receive the comparison signal and control the delay trigger device to complete self-locking and output a self-locking signal;

and the execution device is coupled with the self-locking device and the switch device and is used for receiving the self-locking signal and the switch signal simultaneously and controlling the rotation of the driving assembly.

By adopting the technical scheme, when an operator presses the switch, the switch device converts the pressed physical quantity into a switch signal, and transmits the signal after delaying for a certain time through the delay triggering device, so that the circuit is conducted after the operator presses the switch for a certain time, and the effect of opening the electric screwdriver when the operator touches the switch by mistake can be avoided; after the time delay trigger device is switched on, the circuit is in a conducting state through the locking of the self-locking device, and the screwdriver can be started without pressing the switch for a certain time, so that the operation is more convenient.

and the time delay disconnection device is coupled with the execution device to receive the execution signal and responds to the execution signal to cut off the power supply loop of the time delay trigger device in a time delay way.

Through adopting above-mentioned technical scheme, after the circuit switches on, through the control of time delay disconnection, the circuit can self-closing after the certain time when not using, saves the power, and after the circuit closed, just can open after needing to press the switch certain time again, so after the circuit self-closing, if when operating personnel touched the switch by mistake, the circuit still can not switch on, saves electric power.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the first abutting block is matched with the first abutting groove, and the second abutting block is matched with the second abutting groove, so that the mounting stability of the driving assembly is improved;

2. the abutting plate is abutted against the first limiting plate and the abutting plate is abutted against the second limiting plate, so that the mounting stability of the battery assembly is improved;

3. the first limit semi-ring is matched with the second limit semi-ring, so that the stability of the installation of the battery pack is further improved.

Drawings

Fig. 1 is a schematic view showing a comparative structure of the prior art electric screwdriver.

Fig. 2 is a schematic structural view of the electric screwdriver.

Fig. 3 is an exploded view of the power screwdriver.

Fig. 4 is a first exploded view of the battery assembly, the driving assembly, the first mounting case and the second mounting case.

Fig. 5 is an exploded view of the battery assembly, the driving assembly, the first mounting case and the second mounting case.

Fig. 6 is an exploded view of the first and second mounting housings.

Fig. 7 is a schematic structural diagram of the first mounting case and the second mounting case.

Fig. 8 is a cross-sectional view of the first mounting case, the second mounting case, and the battery module.

Fig. 9 is a schematic structural view of the fixing sleeve, the limiting projection and the dust cap.

Fig. 10 is an exploded view of the retainer sleeve and dust cap.

Fig. 11 is a schematic circuit diagram of the switching device, the delay trigger device, the comparator, the reference device, the self-lock device, and the actuator.

Fig. 12 is a circuit schematic of the time delay disconnect device.

In the figure, 1, a battery pack; 2. a drive assembly; 3. a first mounting case; 4. a second mounting case; 5. installing a sleeve; 6. a handle housing; 7. a first abutting groove; 8. a first abutment block; 9. a second abutting groove; 10. a second abutment block; 11. a butt joint plate; 12. a first limit plate; 13. a second limiting plate; 14. a first limit half ring; 15. a second limit semi-ring; 16. a limiting sheet; 17. a limiting groove; 18. a fixed block; 19. a fixing hole; 20. a butting post; 21. abutting against the hole; 22. fixing a sleeve; 23. a limiting bump; 24. a limiting groove; 25. a dust cover; 26. connecting columns; 27. connecting holes; 28. a switching device; 29. a delay trigger device; 30. a comparison device; 31. a self-locking device; 32. an execution device; 33. a time delay disconnect device; 34. a reference device.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 2 and 3, an electric screwdriver disclosed by the present invention includes a battery assembly 1 and a driving assembly 2; the battery component 1 and the driving component 2 are sleeved with an installation sleeve 5, the installation sleeve 5 is made of plastic materials, the installation sleeve 5 comprises a first installation shell 3 and a second installation shell 4, the section of each of the first installation shell 3 and the second installation shell 4 is semicircular, and when the battery component 1 and the driving component 2 are actually installed, the battery component 1 and the driving component 2 can be wrapped and fixed by buckling the first installation shell 3 and the second installation shell 4; the handle shell 6 is sleeved outside the mounting sleeve 5, the handle shell 6 is made of hollow plastic materials, and the first mounting shell 3 and the second mounting shell 4 are wrapped on the battery component 1 and the driving component 2 and then are sleeved with the handle shell 6 on the mounting sleeve 5.

Referring to fig. 4 and 5, a first abutting groove 7 is formed in the first mounting shell 3, the first abutting groove 7 is disposed through the first mounting shell 3, and a first abutting block 8 inserted into the first abutting groove 7 is disposed on the driving assembly 2; a second abutting groove 9 is formed in the second mounting shell 4, the second abutting groove 9 penetrates through the second mounting shell 4, and a second abutting block 10 inserted into the second abutting groove 9 is arranged on the driving assembly 2; when the first installation shell 3 and the second installation shell 4 are buckled on the driving component 2 and the battery component 1, the first butt joint groove 7 is aligned with the first butt joint block 8, and the second butt joint groove 9 is aligned with the second butt joint block 10, and then buckling is carried out.

Referring to fig. 5 and 6, a plurality of limiting pieces 16 are integrally arranged on two side edges of the first mounting shell 3, in this embodiment, the number of the limiting pieces 16 is preferably four, the limiting pieces 16 extend out in a direction perpendicular to the side edge of the first mounting shell 3 toward the second mounting shell 4, the limiting pieces 16 have certain elastic performance, and the second mounting shell 4 is provided with limiting grooves 17 for the limiting pieces 16 to be inserted into for limiting and corresponding to the limiting pieces 16 one to one; when the first mounting shell 3 is buckled with the second mounting shell 4, the limiting sheet 16 is inserted into the limiting groove 17.

One end of the limiting piece 16, which is far away from the first mounting shell 3, is integrally provided with a fixing block 18, and the fixing block 18 protrudes out of the side edge of the limiting piece 16; the second mounting shell 4 is provided with a fixing hole 19 for clamping and fixing the fixing block 18 and communicating with the limiting groove 17. In the process of first installation shell 3 and the lock of second installation shell 4, fixed block 18 can take place to contradict with spacing groove 17 earlier, orders about spacing piece 16 and takes place certain deformation, inserts to spacing groove 17 after spacing piece 16, and fixed block 18 can insert in fixed orifices 19, and fixed block 18 receives the resilience force butt of spacing piece 16 on the lateral wall of fixed orifices 19 for fixed block 18 is difficult for droing from fixed orifices 19.

Referring to fig. 5 and 7, a butting column 20 is integrally arranged on the first mounting shell 3, the butting column 20 is cylindrically arranged, the butting column 20 extends out in a direction perpendicular to the side edge of the first mounting shell 3 toward the second mounting shell 4, and a butting hole 21 matched with the butting column 20 in a butting manner is arranged on the second mounting shell 4; after first installation shell 3 lock is on second installation shell 4, butt post 20 butt is in butt hole 21 for difficult relative movement takes place after first installation shell 3 and second installation shell 4 are installed, improves the stability of first installation shell 3 and the installation of second installation shell 4.

Referring to fig. 8, the outer side wall of the battery assembly 1 is fixedly connected with a butt plate 11 through glue, the butt plate 11 is a rectangular plate made of plastic, a first limiting plate 12 which is abutted to the butt plate 11 and limited is integrally arranged on the first mounting shell 3, and a second limiting plate 13 which is abutted to the butt plate 11 and limited is integrally arranged on the second mounting shell 4.

The first mounting shell 3 is provided with a first limit half ring 14 which is abutted and limited with the battery component 1, and the second mounting shell 4 is provided with a second limit half ring 15 which is abutted and limited with the battery component 1 and is mutually matched with the first limit half ring 14. First spacing semi-ring 14 and second spacing semi-ring 15 mutually support and surround battery pack 1, prevent that battery pack 1 from taking place to rock when in-service use, improve the stability of battery pack 1 installation.

Referring to fig. 9 and 10, a fixing sleeve 22 abutting against the handle housing 6 for limiting is fixed at one end of the driving assembly 2 away from the battery assembly 1 by a bolt (not shown in the figure), two limiting lugs 23 are symmetrically arranged at one side of the fixing sleeve 22 abutting against the handle housing 6, and limiting grooves 24 abutting against the limiting lugs 23 for limiting are arranged on the first mounting shell 3 and the second mounting shell 4.

One side of fixed cover 22 that keeps away from drive assembly 2 is provided with shield 25, and one side that shield 25 is close to fixed cover 22 an organic whole is provided with four spliced poles 26, offers on the fixed cover 22 to supply spliced pole 26 to insert fixed and with spliced pole 26 one-to-one's connecting hole 27, only need insert the spliced pole 26 on the shield 25 to the connecting hole 27 in, can fix shield 25 on fixed cover 22.

Referring to fig. 11, the switching device 28 includes an intermediate relay K1, a push switch S, and a resistor R1, the intermediate relay K1 being of type HF32F, and the push switch S being of type LA 2.

One end of an intermediate relay K1 is connected with a power supply VCC, the other end of the intermediate relay K1 is connected with one end of a button switch S, the other end of the button switch S is connected with one end of a resistor R1, the other end of the resistor R1 is grounded GND, and the voltage of the power supply VCC is 6V.

When the button switch S is pressed, the intermediate relay K1 is powered; when the push switch S is not pressed, the intermediate relay K1 is not energized.

The delay trigger 29 includes a resistor R2, a capacitor C1, and a resistor R3. The capacitor C1 is of the type CD92 LH.

One end of an intermediate relay normally-open contact K1-3 is connected with a power supply VCC and one end of an intermediate relay normally-closed contact K4-1, the other end of an intermediate relay normally-open contact K1-3 is connected with the other end of an intermediate relay normally-closed contact K4-1, one end of an intermediate relay normally-open contact K1-1 and one end of an intermediate relay normally-open contact K2-1, the other end of an intermediate relay normally-open contact K1-1 is connected with the other end of an intermediate relay normally-open contact K2-1, one end of a resistor R2 and one end of a capacitor C1, the other end of the resistor R2 is connected with one end of a resistor R3 and the other end of a capacitor C1, and the other end of the.

The intermediate relay normally closed contact K4-1 is in a closed state under the condition of not being electrified, and the intermediate relay normally closed contact K4-1 is in an open state under the condition of being electrified.

When the intermediate relay K1 is electrified, the intermediate relay normally-open contact K1-3 and the intermediate relay normally-open contact K1-1 are closed, the capacitor C1 is electrified and charged until the capacitor C1 is fully charged, the voltage of the resistor R3 to the ground GND is gradually increased along with the charging of the capacitor C1 until the voltage of the resistor R3 to the ground GND is in the highest state after the capacitor C1 is fully charged; when the intermediate relay K1 is not powered, the intermediate relay normally open contact K1-3 and the intermediate relay normally open contact K1-1 are both opened and closed, the capacitor C1 is not powered and is not charged, and the resistor R3 is not powered.

The comparator 30 is a comparator N1, the comparator N1 is LM393, and the reference device 34 comprises a resistor R5 and a resistor R6.

The non-inverting input terminal of the comparator N1 is connected to the connection point between the resistor R3 and the capacitor C1, the inverting input terminal of the comparator N1 is connected to one end of the resistor R5 and one end of the resistor R6, the other end of the resistor R5 is connected to the power supply VCC, and the other end of the resistor R6 is connected to the ground GND.

When the capacitor C1 is full, the delay trigger signal is greater than the reference signal, and the comparator N1 outputs a high-level comparison signal; when the capacitor C1 is not full, the delay trigger signal is less than the reference signal, and the comparator N1 outputs a low level comparison signal.

The self-locking device 31 comprises a triode Q1, an intermediate relay K2 and a resistor R7, wherein the triode Q1 is an NPN type triode with the model number of 2SC2458, and the intermediate relay K2 is HF 32F. The actuating device 32 comprises a resistor R4, a driving motor M and an intermediate relay K3, wherein the model of the driving motor M is ZY80-30, and the model of the intermediate relay K3 is HF 32F.

The output end of the comparator N1 is connected with the base electrode of the triode Q1, the emitting electrode of the triode Q1 is grounded GND, the collecting electrode of the triode Q1 is connected with one end of the intermediate relay K2, the other end of the intermediate relay K2 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the power supply VCC.

One end of an intermediate relay normally-open contact K1-2 is connected with a power supply VCC, the other end of the relay normally-open contact K1-2 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with one end of an intermediate relay normally-open contact K2-2, the other end of the intermediate relay normally-open contact K2-2 is connected with one end of a driving motor M, the other end of the driving motor M is connected with one end of an intermediate relay K3, and the other end of the intermediate relay K3 is grounded GND.

When the triode Q1 receives a high-level comparison signal, the base of the triode Q1 is conducted after receiving the high-level signal, the intermediate relay K2 is powered on, the normally open contact K2-2 of the intermediate relay is closed, and the normally open contact K2-1 of the intermediate relay is powered on and closed to complete self-locking.

Once the button switch S is pressed, the intermediate relay K1 is powered on, so that the normally open contact K1-2 of the intermediate relay is closed, the intermediate relay K3 is powered on, the driving motor M is powered on to work at the moment, and the electric screwdriver starts to work; when the button switch S is not pressed down, the intermediate relay K1 is not powered on, so that the normally open contact K1-2 of the intermediate relay is not closed, the intermediate relay K3 is not powered on, the driving motor M is not powered on at the moment, and the electric screwdriver does not work.

Referring to fig. 11 and 12, the delay disconnection device 33 includes a resistor R8, a capacitor C2, a resistor R9, a resistor R10, a comparator N2, a resistor R11, a resistor R12, a transistor Q2, and a relay K4; the type of the capacitor C2 is CD92LH, the type of the comparator N2 is LM393, the type of the triode Q2 is an NPN type triode and is 2SC2458, and the type of the relay K4 is HF 32F.

One end of a normally closed contact K3-1 of the intermediate relay K3 is connected with a power supply VCC, one end of a resistor R8 is connected with the other end of the normally closed contact K3-1 of the intermediate relay K3 and one end of a capacitor C2; one end of a resistor R9 and one end of a resistor R9 are connected with the other end of the resistor R8 and the other end of a capacitor C2, one end of a resistor R10 is grounded GND, the other end of a resistor R10 is connected with the other end of R9 and the homodromous input end of a comparator N2, one end of a resistor R11 is connected with a power supply VCC, the other end of a resistor R11 is connected with the inverting input end of the comparator N2 and one end of a resistor R12, and the other end of the resistor R12 is connected with the grounded GND; the output end of the comparator N2 is connected with the base electrode of the triode Q2, the emitting electrode of the triode Q2 is grounded GND, the collecting electrode of the triode Q2 is connected with one end of the relay K4, and the other end of the relay K4 is connected with a power supply VCC; one end of a normally closed contact K4-1 of the relay K4 is connected with a power supply VCC and one end of an intermediate relay normally open contact K1-3, and one end of a normally closed contact K4-1 of the relay K4 is connected with the other end of an intermediate relay normally open contact K1-3, one end of an intermediate relay normally open contact K1-1 and one end of an intermediate relay normally open contact K2-1.

When the intermediate relay K3 is powered on, the normally closed contact K3-1 of the intermediate relay is disconnected, the capacitor C2 starts to discharge, the homodromous input end of the comparator N2 is smaller than the inverting input end of the comparator N2, the comparator N2 outputs a low level signal, the base of the triode Q2 receives the low level signal, the relay K4 is not powered on, and the normally closed contact K4-1 of the relay is powered off and closed.

When the intermediate relay K3 is not powered on, the normally closed contact K3-1 of the intermediate relay is closed, the capacitor C2 is charged, after the capacitor C2 is fully charged, the homodromous input end of the comparator N2 is larger than the inverting input end of the comparator N2, the comparator N2 outputs a high level signal, the base of the triode Q2 receives the high level signal, the relay K4 is powered on, and the normally closed contact K4-1 of the relay is powered on and disconnected.

The installation step:

1. aligning the first abutting groove 7 with the first abutting block 8, aligning the second abutting groove 9 with the second abutting block 10, and fastening the first mounting shell 3 and the second mounting shell 4 on the battery assembly 1 and the driving assembly 2;

2. sleeving the handle shell 6 on the mounting sleeve 5;

3. aligning the limiting lug 23 on the fixing sleeve 22 with the limiting groove 24 on the handle shell 6, and fixing the fixing sleeve 22 through a bolt;

4. and then the connecting post 26 of the dust cap 25 is inserted into the connecting hole 27 to fix the dust cap 25 on the fixing sleeve 22.

5. After the button switch S is pressed for a period of time, the intermediate relay K1 is electrified, the intermediate relay normally-open contact K1-1, the intermediate relay normally-open contact K1-2 and the intermediate relay normally-open contact K1-3 are closed, so that after the capacitor C1 is fully charged, the intermediate relay K2 is electrified, the intermediate relay normally-open contact K2-1 and the intermediate relay normally-open contact K2-1 are closed, and the driving motor M is electrified to start working; the intermediate relay K3 is electrified, the normally closed contact K3-1 of the intermediate relay K3 is disconnected, the equidirectional input end of the comparator N2 is not electrified, the comparator N2 outputs a low level, the triode Q2 receives a low level signal, the relay K4 is not electrified, the normally closed contact of the relay K4 is closed, and the normally closed contact K4-1 of the relay is in a closed state.

At the moment when the driving motor M is in a working state and the button switch S is released, the intermediate relay normally-open contact K1-2 is disconnected, the intermediate relay normally-open contact K1-2 is disconnected, the intermediate relay normally-open contact K1-3 is disconnected, the intermediate relay K3 is not electrified, the normally-closed contact of the intermediate relay K3-1 is closed, the capacitor C2 is charged, the homodromous input end of the comparator N2 receives a low level signal, the comparator N2 outputs a low level signal, the relay K4 is not electrified at the moment, the normally-closed contact K4-1 of the relay 4 is closed, the capacitor C1 is still connected with the power supply VCC at the moment, and therefore the capacitor C1 is in a full-charge state.

If the time after the button switch S is released is less than the full-charge time of the capacitor C2, the button switch S is pressed again, the normally open contact K1-2 of the intermediate relay is closed, and the driving motor M works immediately after being electrified; if the time after the button switch S is released is longer than the time when the capacitor C2 is fully charged, because the capacitor C2 is fully charged, the equidirectional input end of the comparator N2 receives a high level signal, the comparator outputs a high level signal, meanwhile, the triode Q2 outputs a high level signal, the relay K4 is charged, the normally closed contact K4-1 of the relay K4 is disconnected, because the normally open contact K1-3 of the intermediate relay is disconnected at the moment, the normally closed contact K4-1 of the relay K4 is disconnected, the driving motor M does not work when the power is supplied, the button switch S is pressed again when the time after the button switch S is released is longer than the time when the capacitor C2 is fully charged, and the driving motor M needs to work again after the C1 is fully charged.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides an electric screwdriver, includes drive assembly (2), cladding and install cover (5) that shell (4) constitute by first installation shell (3) and second on drive assembly (2), its characterized in that: be provided with first butt joint groove (7) that run through first installation shell (3) on first installation shell (3), be provided with first butt joint piece (8) of inserting in first butt joint groove (7) on drive assembly (2), be provided with second butt joint groove (9) that run through second installation shell (4) on second installation shell (4), be provided with second butt joint piece (10) of inserting in second butt joint groove (9) on drive assembly (2).

2. The electric screwdriver according to claim 1, wherein: the battery pack is characterized by further comprising a battery assembly (1), wherein a butt plate (11) is fixedly connected to the battery assembly (1), a first limiting plate (12) which is abutted and limited with the butt plate (11) is integrally arranged on the first mounting shell (3), and a second limiting plate (13) which is abutted and limited with the butt plate (11) is integrally arranged on the second mounting shell (4);

the battery pack mounting structure is characterized in that a first limiting half ring (14) which is abutted and limited with the battery pack (1) is arranged on the first mounting shell (3), and a second limiting half ring (15) which is abutted and limited with the battery pack (1) and matched with the first limiting half ring (14) is arranged on the second mounting shell (4).

3. The electric screwdriver according to claim 1, wherein: a plurality of limiting pieces (16) are integrally arranged on two side edges of the first installation shell (3), the side edges of the limiting pieces (16) perpendicular to the first installation shell (3) stretch out towards the second installation shell (4), and limiting grooves (17) for the limiting pieces (16) to be inserted into the limiting grooves are formed in the second installation shell (4).

4. The electric screwdriver according to claim 3, wherein: spacing piece (16) keep away from one side an organic whole of first installation shell (3) and be provided with fixed block (18), set up on second installation shell (4) and supply fixed block (18) joint fixed and with spacing groove (17) fixed orifices (19) that communicate each other.

5. The electric screwdriver according to claim 1, wherein: the utility model discloses a supporting installation of a motor vehicle, including first installation shell (3), the integrative butt post (20) that is provided with on first installation shell (3), the side of the perpendicular first installation shell (3) of butt post (20) stretches out to the direction of second installation shell (4), be provided with on second installation shell (4) with butt post (20) butt complex butt hole (21).

6. The electric screwdriver according to claim 1, wherein: the one end that battery pack (1) was kept away from in drive assembly (2) is fixed with fixed cover (22) through the bolt, fixed cover (22) are provided with spacing lug (23) with one side that handle shell (6) contradicted, be provided with on handle shell (6) contradict spacing recess (24) with spacing lug (23).

7. The electric screwdriver according to claim 6, wherein: and a dustproof cover (25) is arranged on one side of the fixed sleeve (22) far away from the driving component (2).

8. The electric screwdriver according to claim 7, wherein: one side of the dustproof cover (25) close to the fixed sleeve (22) is integrally provided with a plurality of connecting columns (26), and the fixed sleeve (22) is provided with connecting holes (27) for the connecting columns (26) to be inserted and fixed and corresponding to the connecting columns (26) one by one.

9. The electric screwdriver according to claim 1, wherein: further comprising:

a switch device (28) that is provided on the battery pack (1) and converts a physical amount of depression into a switch signal;

the delay trigger device (29) is coupled with the switch device (28) to receive the switch signal and delay and output the delay trigger signal;

a comparing device (30) coupled to the delay trigger device (29) for receiving the delay trigger signal and outputting a comparison signal;

a reference device (34) coupled to the comparison device (30) for providing a reference signal to the comparison device (30);

the self-locking device (31) is coupled with the comparison device (30) to receive the comparison signal and control the delay trigger device to complete self-locking and output a self-locking signal;

the actuating device (32) is coupled with the self-locking device (31) and the switching device (28) and simultaneously receives the self-locking signal and the switching signal and controls the rotation of the driving assembly (2);

when the delay trigger signal is larger than the reference signal, the comparison device (30) outputs a high-level comparison signal and controls the self-locking device (31) to output a self-locking signal.

10. The electric screwdriver according to claim 1, wherein: and the delay disconnection device (33) is coupled with the execution device (32) to receive the execution signal and responds to the execution signal to delay and cut off the power supply loop of the delay triggering device (29).