CN105437168B

CN105437168B - Power tool

Info

Publication number: CN105437168B
Application number: CN201510923436.2A
Authority: CN
Inventors: 张士松; 钟红风; 庞晓丽; 徐静涛; 保罗·安德罗
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2011-08-06
Filing date: 2011-08-06
Publication date: 2018-07-06
Anticipated expiration: 2031-08-06
Also published as: CN105437128A; CN105437169A; CN102909698B; CN105437169B; CN102909698A; CN105437168A; CN105437128B

Abstract

The present invention relates to a kind of power tool, including：Casing；Motor is arranged in casing simultaneously outputting rotary power；Main shaft is coupled with one of several work heads and for the work head to be driven to rotate；Transmission mechanism is arranged between motor and main shaft and can the rotary power that motor exports be passed to main shaft；Storage folder, it is set in casing, storage folder is included for the receiving storehouse that accommodates several work heads being set up in parallel, and main shaft can be axially moved the operating position across the mating of receiving one of storehouse and several work heads and the releasing position separated with one of several work heads；Power tool further includes the position-limit mechanism being arranged between casing and main shaft, position-limit mechanism includes the limited block operationally moved between two positions, in first position, main shaft is in operating position, the main direction axially away from work head of limited block limitation moves, in the second position, main shaft is in releasing position, and limited block allows the main direction axially away from work head to move.

Description

Power tool

The application is " power tool and for the power tool entitled filed in applicant's August in 2011 6 days Operating method ", application No. is the divisional applications of 201110224257.1 Chinese invention patent application.

Technical field

Storage and quick-replaceable drill gun the present invention relates to a kind of power tool more particularly to a kind of achievable work head Class power tool.

Background technology

In existing drill gun class power tool, electric drill, electric screw driver and impact drill are generally included.

Electric screw driver is for by a kind of common electric tool on screw-driving to workpiece.It is needed during use When tightening the screw of different size, different work heads, that is, screwdriver bit are replaced according to the difference of screw specification, i.e., Originally the work head installed is removed, then loads onto the work head of another structure.In the use for needing frequently replacement work head Under occasion, great inconvenience is brought to operator, on the one hand cause replace work head it is loaded down with trivial details, the work on the other hand removed Head is placed be easily lost everywhere.Although there is some that can realize the storage of work head and quick-replaceable in some hand-operated tools, It is the inherent defect due to hand-operated tools, i.e. torque is small, and operation is hard so that operator is easy to fatigue, causes inefficiency, Be not suitable for the tool as profession in industrial sector to use.

Chinese utility model patent CN201086280Y discloses a kind of Multi-tool head electric tool, including power tool body With multi-knife-head rotaring wheel structure, multi-knife-head rotaring wheel structure includes a multi-knife-head runner cylinder that can accommodate multiple cutter heads, and multi-knife-head turns Cylinder is axially slidable is connected with tool body for wheel, when multi-knife-head runner cylinder slides into the position of separate tool body, can lead to Rotation multi-knife-head runner cylinder is crossed so as to select the cutter head needed.But when multi-knife-head runner cylinder is far from tool body, main shaft It is exposed, dust, powder can enter during multi-knife-head runner cylinder slides inside electric tool or multi-knife-head The inside of runner cylinder, the time, which has been grown, can cause multi-knife-head runner cylinder that can not rotate progress cutter head selection or directly result in electronic Tool can not use.And work head is against on workpiece when work, such main shaft needs to bear the active force of negative direction, Main shaft can bring pressure so as to which torque cannot be transmitted to main shaft by transmission mechanism to transmission mechanism.

In addition, the randomness due to electric tool in use, when shutting down on main shaft installment work head cylinder The angle of wall is uncertain, and the angle that work head retracts runner cylinder is also uncertain, so in the mistake for replacing work head Cheng Zhong, it is possible to there are the dislocation of angle and the work head angle of the barrel of main shaft, cause work head can not correctly, smoothly into Enter the situation of main shaft.Chinese utility model patent CN201086280Y discloses multi-knife-head runner cylinder and switch gearing, works as multitool When head runner cylinder slides into the position far from tool body, the cutter head needed can be selected by rotating multi-knife-head runner cylinder； When multi-knife-head runner cylinder slides back into tool body, interlocking bar movement is driven, interlocking bar, which can press switch, makes motor work Make, rotating a certain angle makes sleeve angle be matched with cutter head angle.On the one hand, the regular motor of startup in short-term is easily made It shortens or damages into electrical machinery life；The angle being staggered between another aspect sleeve and cutter head generally will not be very big, ordinary circumstance For the handle of lower cutter head to be hexagonal, remaining does not exceed 60 degree with the angle that sleeve is staggered, and even if electric motor micro-motion once will Take a turn for the better multi-turn, if motor rotation it is not in place, not only cutter head can not accurately, smoothly enter sleeve, it is also possible to cause motor Or the damage of cutter head.

Moreover, when replacing cutter head, need that cutter head first is retracted into runner cylinder, knife when runner cylinder moves axially in order to prevent Head is sucked and is left from runner cylinder by magnet, and Chinese utility model patent CN201086280Y discloses it and passes through on cutter head The mode of retainer ring is set to prevent cutter head from being disengaged with runner cylinder, but such cutter head needs are especially customized so that tool Using without versatility.And it is directly more unstable by main shaft band dynamic cutter head speed ratio, it is main because the length of main shaft is longer The bounce of axis is bigger, brings some potential dangerous to the user of tool.Furthermore because runner cylinder need move axially with Main shaft separates, it is easy to can not be cleaned into dust and other impurities.

Invention content

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of power tools of reliable operation.

The technical solution adopted by the present invention to solve the technical problems is：A kind of power tool, including：Casing；Motor, if It puts in casing, and outputting rotary power；Main shaft is coupled with one of several work heads and for driving several described work The rotation of one of head；Transmission mechanism is arranged between motor and main shaft and can the rotary power that motor exports be passed to main shaft；It deposits Chu Jia is set in casing, and the storage folder includes the receiving storehouse for accommodating several work heads being set up in parallel, the master Axis can be in the operating position being coupled across receiving one of storehouse and several work heads and one of with several work heads It is axially moved between separated releasing position；The power tool further includes the position-limit mechanism being arranged between casing and main shaft, The position-limit mechanism includes the limited block operationally moved between two positions, and in first position, the main shaft is in work Position, the main direction axially away from work head of limited block limitation move, and in the second position, the main shaft is in release position It puts, the limited block allows the main direction axially away from work head to move.

Preferably, the power tool further includes the operating parts that is set to and can be moved axially on casing along main shaft, described Operating parts drives the main shaft to be axially moved.

Preferably, the operating parts is equipped with the solution lock section to offset with limited block, and the operating parts passes through the solution lock section Limited block is driven to move between the first position and the second position, and in the second position, the operating parts can drive The main shaft is axially moved.

Preferably, a part for the storage folder is housed in the casing, and another part is covered simultaneously by the operating parts And expose as operating parts is mobile.

Preferably, the operating parts and casing alternative one upper edge main shaft are axially arranged with guide groove, the operating parts and machine Another of both shells is equipped with the guide rail to match with guide groove, and the operating parts is slided by the guide rail in guide groove And it is axially moved relative to casing along main shaft.

Preferably, inside the operating parts along the main shaft axially spaced-apart be equipped with the first convex block and the second convex block, it is described The one end of main shaft far from the storage folder is equipped with fixed block, and the fixed block is relative to main shaft axial restraint and positioned at described the Between one convex block and the second convex block, the fixed block can be axially moved between the first convex block and the second convex block.

Preferably, the casing can axially be divided into the motor part equipped with motor along main shaft, the driving section equipped with transmission mechanism, Storage part equipped with storage folder, when the main shaft is in operating position, the operating parts axial direction and the driving section and storage part Overlapping；When the main shaft is in releasing position, the operating parts is axial Chong Die with the motor part, with driving section part weight It is folded.

Preferably, the limited block surrounds pivoting perpendicular to main shaft axial direction.

Preferably, the limited block, which surrounds, is parallel to pivoting for main shaft axial direction.

Preferably, the limited block moves along a straight line along perpendicular to main shaft axially direction.

Preferably, the power tool further includes the output shaft for connecting work head, one end of the main shaft with it is described Transmission mechanism can transmit the connection of torque, and the other end of the main shaft can be connected to the output shaft and be driven by output shaft Work head rotates.

Preferably, the position-limit mechanism further includes the elastic element that limited block is compressed to first position.

Preferably, gear-box is equipped in the casing, the transmission mechanism is housed in the gear-box, the gear-box Toothed wheel box cover plate is equipped between storage folder.

Preferably, the storage folder is rotatably supported between casing and the toothed wheel box cover plate.

Preferably, the transmission mechanism includes the planetary gear reducing mechanism being connected with motor and is connected with the main shaft Pinion gear mechanism, be equipped in the gear-box between the planetary gear reducing mechanism and the pinion gear mechanism every Plate.

Preferably, the pinion gear mechanism include connect with the planetary gear reducing mechanism first gear, with it is described The third gear of main shaft connection and the second gear engaged simultaneously with first gear and third gear.

Also a kind of operating method of power tool of the present invention, the power tool include：Casing；Motor is arranged on casing It is interior, and outputting rotary power；Main shaft is coupled with one of several work heads and for driving the rotation of one of several work heads Turn；Transmission mechanism is arranged between motor and main shaft and can the rotary power that motor exports be passed to main shaft；Storage folder, if It is placed in casing, the storage folder includes the receiving storehouse for accommodating several work heads being set up in parallel, and the main shaft can It separates in the operating position being coupled across receiving one of storehouse and several work heads and with one of several work heads It is axially moved between releasing position；The power tool further includes the position-limit mechanism being arranged between casing and main shaft, the limit Position mechanism includes the limited block operationally moved between two positions, and in first position, the main shaft is in operating position, institute It states the main direction axially away from work head of limited block limitation to move, in the second position, the main shaft is in releasing position, the limit Position block allows the main direction axially away from work head to move, and the operating method includes the following steps：1) operation limited block is in The second position releases the limitation that limited block is axially moved main shaft；2) mobile main shaft is in releasing position；3) operation storage folder, Select the work head needed；4) mobile main shaft returns back to operating position.

Preferably, the power tool further includes the operating parts that is set to and can be moved axially on casing along main shaft, described Operating parts drives the main shaft to be axially moved, and the operating parts is equipped with the solution closing piece to offset with limited block, and the operating parts leads to Crossing the solution closing piece drives limited block to move between the first position and the second position, and the operating method further includes：Pass through axis After moving operation part makes limited block be in the second position, continue to move to operating parts and main shaft is driven to be in releasing position.

Preferably, the operating method further includes：After moving operation part drives main shaft to be in releasing position, the storage folder A part expose as operating parts is mobile.

Preferably, the position-limit mechanism further includes the elastic element that limited block is compressed to first position, the operating method It further includes：After the main shaft returns back to operating position, the limited block is compressed by elasticity returns back to first position.

Compared with prior art, the beneficial effects of the invention are as follows：The power tool of the present invention during the work time can be effective Limitation main axle moving, it is ensured that higher reliability.

Description of the drawings

Fig. 1 is the sectional view when power tool in the preferred embodiment for the present invention is in running order.

Fig. 2 is that power tool in Fig. 1 is in sectional view when replacing work head status.

Fig. 3 is the part isometric exploded view of power tool in Fig. 1.

Fig. 4 is the stereogram of power tool running part in Fig. 1.

Fig. 5 is the stereogram of the slip lid of power tool in Fig. 1.

Fig. 6 is the schematic diagram of the position-limit mechanism first embodiment of power tool in Fig. 1, and position-limit mechanism is in locking at this time State.

Fig. 7 is similar to Fig. 6, and wherein position-limit mechanism is in the unlocked state.

Fig. 8 is the schematic diagram of the position-limit mechanism second embodiment of power tool in Fig. 1, and position-limit mechanism is in locking at this time State.

Fig. 9 is similar to Fig. 8, and wherein position-limit mechanism is in the unlocked state.

Figure 10 is the schematic diagram of the position-limit mechanism third embodiment of power tool in Fig. 1, and position-limit mechanism is in lock at this time Determine state.

Figure 11 is similar to FIG. 10, and wherein position-limit mechanism is in the unlocked state.

Figure 12 is the schematic diagram of first embodiment that limitation work head retreats when power tool replaces work head in Fig. 2.

Figure 13 is the schematic diagram that block piece is in first position in Figure 12.

Figure 14 is the schematic diagram that block piece is in the second position in Figure 12.

Figure 15 is the schematic diagram of second embodiment that limitation work head retreats when power tool replaces work head in Fig. 2.

Figure 16 is the schematic diagram that block piece is in first position in Figure 15.

Figure 17 is the schematic diagram that block piece is in the second position in Figure 15

Figure 18 is the schematic diagram of the first embodiment of the output shaft of power tool in Fig. 1.

Figure 19 is the front view of the output shaft of power tool in Figure 18.

Figure 20 is the schematic diagram of the second embodiment of the output shaft of power tool in Fig. 1.

Figure 21 is the front view of the output shaft of power tool in Figure 20.

Figure 22 is the schematic diagram of the third embodiment of the output shaft of power tool in Fig. 1.

Figure 23 is the front view of the output shaft of power tool in Figure 22.

Wherein,

1. 2. motor of casing, 3. transmission mechanism

4. 5. Working head quick-changing mechanism of output shaft, 6. battery

7. button switch 8,9. work head of 8a, 8b. position-limit mechanism

11. 13. front housing of handle, 15. guide groove

21. 22. gear-box of motor shaft, 30. pinion gear mechanism

31. 40. sleeve of planetary gear reducing mechanism, 41. through-hole

42. 45. deep gouge of step in radial protrusion 43.

50. 51. main shaft 52. of fixed block storage folder

53. 54. steel cap 56.U type springs of slip lid

57. shrapnel 81,81a, 81b. limited block 82,82a. axis pins

83. 131. trepanning of torsional spring 83b. springs

221. partition board, 223. toothed wheel box cover plate, 225. arched member

301. first gear, 302. second gear, 303. third gear

411. bottom surface, 412. side, 413. side

421. inclined-plane, 511. magnet, 512. annular groove

521. work heads receiving 522. pressing plate 523. of storehouse is open

526.U type grooves 532. solve 533. inclined-plane of closing piece

535. first 536. second convex block of convex block, 537. tread plate

571. elasticated end, 813. side

Specific embodiment

In the preferred embodiment of power tool of the present invention, power tool is powered screwdriver, according to power source not With can be divided into pneumatic screw driver, surge screwdriver and electric screw driver, be also divided into direct current in electric screw driver and exchange, this hair It is bright to be preferably specifically described by taking DC electric screwdriver as an example.

Referring to figs. 1 to shown in Fig. 3, which includes casing 1, motor 2, battery 6, transmission mechanism 3, work Head quick-changing mechanism 5 and output shaft 4.Casing 1 is closed up by symmetrical two half shells by screw (not shown) to be assembled, It is arrived with horizontal component with 11 part of handle of K angled with horizontal component settings, currently preferred angle K at 100 degree Between 130 degree, such gripping handle 11 can be pleasant when operating.Button switch 7, battery are equipped on the top of 11 part of handle 6 are fixed on the bottom of 1 handle of casing, 11 part, and 3 part of transmission mechanism is fixed and is housed in the horizontal component of casing 1.As excellent The embodiment of choosing, the battery 6 can be lithium ion batteries.It should be noted that described lithium ion battery is cathode here General name of the material for the rechargeable battery of elemental lithium, according to the difference of positive electrode, may make up many systems, such as " lithium manganese " electricity Pond, " lithium iron " battery etc..In the present embodiment, lithium ion battery of the lithium ion battery for a section 3.6V (volt).Certainly, battery 6 can also be the battery types well known to those skilled in the art such as ni-Cd, ni-mh.

(right side using drawing is rear) includes the planetary gear reducing mechanism that is driven by motor 2 to transmission mechanism 3 from the front to the back 31 and pinion gear mechanism 30, wherein pinion gear mechanism 30 is connected with Working head quick-changing mechanism 5, and passes through Working head quick-changing mechanism 5 The rotary motion of motor 2 is passed into output shaft 4.Wherein Working head quick-changing mechanism 5 includes storing different work heads Storage folder, work head here refers mainly to the common crosspoint tip screwdriver head of electric screw driver, flat blade screwdriver head etc., by setting work head fast Quick-replaceable different work head when converting mechanism 5 can be tightened in electric screw driver or unclamp different screws.

According to the composition of more than electric screw driver, electric screw driver can successively from the front to the back (right side using drawing is rear) point Into the motor part D of setting motor, the driving section C of transmission mechanism 3, the storage part B of setting storage folder and setting output shaft are set Output section A.

Motor in the preferred embodiment for the present invention is motor 2, and motor 2 has the motor extended anteriorly out from electric machine casing Axis 21.Motor 2 is fixed in casing 1, and a gear-box 22 is fixed in casing 1 and positioned at the forepart of motor 2, and gear-box 22 is used for Accommodate planetary gear reducing mechanism 31 and pinion gear mechanism 30.Wherein planetary gear reducing mechanism 31 has three-level deceleration system, The extension of motor shaft 21 is engaged with planetary gear reducing mechanism 31, and planetary gear reducing mechanism 31 communicates rotational motion to pinion gear Mechanism 30.When motor 2 is run in this way, by planetary gear reducing mechanism 31, pinion gear mechanism 30, finally exported by output shaft 4. In the present embodiment, deceleration mechanism is made of to obtain wanted output speed three-level deceleration system, in other embodiment party In formula, depending on the rotating speed of required output, deceleration mechanism can only include level-one or double reduction system, can also include more stages Deceleration system.

Pinion gear mechanism 30 is also housed in 22 in gear-box, by planetary gear reducing mechanism 31 and pinion gear mechanism Partition board 221 is set to separate the two between 30, and toothed wheel box cover plate 223 is set between gear-box 22 and Working head quick-changing mechanism 5, Transmission mechanism 3 and storage folder 52 can be separated in this way, i.e. transmission mechanism 3 and storage folder 52 is independent from each other.Pinion gear mechanism 30 include the first gear 301 that can be transmitted torque with planetary gear reducing mechanism 31 and connect, and are connect with Working head quick-changing mechanism 5 Third gear 303 and the second gear 302 engaged with first gear 301 and third gear 303, second gear 302 is by first The rotation of gear 301 passes to third gear 303, and the both ends of each gear are supported by axle sleeve.The middle part of partition board 221 is set There is the hole that the axis for first gear 301 passes through, the end face of partition board 221 is equipped with the groove for installing axle sleeve, supports pinion gear machine The rear axle housing of structure 30 is fixed on partition board 221, and front shaft sleeve is fixed on toothed wheel box cover plate 223, toothed wheel box cover plate 223 and gear-box 22 can be fixedly linked by screw, buckle etc., in this way, pinion gear mechanism 30 and planetary gear reducing mechanism 31 can be divided It opens, while the two can be closed again, prevent dust, powder etc. from entering inside transmission mechanism 3, can also prevent letting out for lubricating oil Leakage.In addition, three gears of setting are intended merely to make the inner space of tool compacter, so as to not influence external beauty.When So, two gears can also be arranged as required into, one is connected with planetary gear reducing mechanism 31, another and collet quick change Mechanism 5 is connected.In addition, transmission mechanism 3 is not limited to above-described form, transmission mechanism 3 can only include planetary gear Deceleration mechanism 31 either only includes pinion gear mechanism 30 or other rotary motion transmission mechanisms, such as ratchet mechanism, turbine Mechanism etc..

Working head quick-changing mechanism 5 is connected between output shaft 4 and pinion gear mechanism 30, including that can be passed with third gear 303 Main shaft 51, work head storage folder 52 and the operation axis 51 of torque delivery connection move axially to pass through or leave work head and deposit The slip lid 53 of storage folder 52.Main shaft 51 can connect with output shaft 4 and output shaft 4 is driven to rotate, and front housing 13 is connected on casing 1, A part for work head storage folder 52 is housed in front housing 13, and another part is covered with the movement of slip lid 53 and revealed by slip lid 53 Go out.Currently preferred storage folder 52 is cylindrical shape, facilitates rotation, occupies little space simultaneously, naturally it is also possible to set squarely Or triangle etc..When electric screw driver works, slip lid 53 is abutted with front housing 13, in this way can be work head Storage folder 52 and main shaft 51 are all closed.The position that main shaft 51 is corresponded on toothed wheel box cover plate 223 is equipped with what is passed through for main shaft 51 Hole is extended with arched member 225 on gear-box 22 around 51 axis of main shaft, and arched member 225 can be wholely set with gear-box 22, It can be provided separately, by setting arched member 225 that main shaft 51 is partially enclosed, more be changed jobs in electric screw driver Head 9 when, i.e., slip lid 53 is moved to the position of rearmost end and main shaft 51 will not be exposed, and can prevent dust, powder in this way The inside of the entering tools such as end.Moreover, toothed wheel box cover plate 223 extends to the end face of arched member 225, so as in an axial direction by driver 3 integrally closed of structure is together.During the work time, work head can be stored folder 52 and is closed by slip lid 53, so as to prevent ash Dirt enters, and when needing replacing work head, work head storage folder 52 can be exposed by removing slip lid 53, facilitated and selected different work Head thus needs slip lid 53 to have certain length, when slip lid 53 is moved to the operating position abutted with front housing 13, slip lid 53 with storage part B and driving section C axial overlaps, when slip lid 53 is moved to the position of replaceable work head, slip lid 53 and motor Portion's D axial overlaps, and with driving section C portion axial overlap.Certainly, the mode that slip lid 53 moves is also very much, such as slip lid 53 It is rotatably mounted on casing 1, is rotated between covering storage folder 52 and two positions for exposing storage folder 52；Or it is similar to The mode of sliding door can be opened or is closed；Mode of window for being connected to casing 1 either pivoted etc., can realize By 52 closing of storage folder during work, storage folder 52 is exposed when needing replacing work head.

Output shaft 4 is form of sleeve, in can installment work head 9, and work head 9 can be driven to rotate, the present invention passes through Main shaft 51 is inserted into output shaft 4 and output shaft 4 is driven to rotate, and then will rotation in a manner that output shaft 4 drives work head 9 to rotate Movement passes to work head 9, can use the work head 9 of standard in this way, and without opening up receiving work head 9 on main shaft 51 Hole, avoid 51 diameter of main shaft it is excessive increase complete machine weight and volume.Output shaft 4 is supported on front housing 13 by a sleeve 40 In axial aperture 131, sleeve 40 is fixed in the trepanning 131 of front housing 13, and radial support and axially position are provided to output shaft 4. In this way, it is output shaft directly to drive the rotation of work head 9, the distance of torque transmission is shortened, more may be used so as to the use of tool It leans on.It is above-described for main shaft output shaft indirect belt move work head rotation by way of, still, those skilled in the art hold very much Other transmission modes are readily conceivable that substitute, for example main shaft directly drives work head to rotate, i.e., main shaft directly with work head with can The mode for transmitting torque connects.

With reference to shown in Fig. 5, main shaft 51 is six square shafts for Fig. 1 to Fig. 3 cooperations, and axial restraint is equipped with a fixed block on main shaft 51 50, the rear end of main shaft 51 is rotatably against on fixed block 50, and slip lid 53 can drive master by way of being connected with fixed block 50 Axis 51 moves.The inside of slip lid 53 is equipped with the first convex block 535 and the second convex block 536 along 51 axially spaced-apart of main shaft, in electric screw The working condition of knife, the first convex block 535 have distance S with 50 axially spaced-apart of fixed block, when slip lid 53 slides backward, i.e., towards motor 2 direction is slided, and after having slided distance S, the first convex block 535 is axially abutted with fixed block 50, is fixed so as to which slip lid 53 drives Block 50 then drives main shaft 51 to move axially backward；In the state of the replaceable work head of electric screw driver, the second convex block 536 is with consolidating Determining 50 axially spaced-apart of block has distance S, when 53 forward slip of slip lid, i.e., is slided towards the direction of output shaft 4, slided distance S it Afterwards, the second convex block 536 is axially abutted with fixed block 50, so as to which slip lid 53 drives fixed block 50 then to drive main shaft 51 axially forward It is mobile.Certainly, the mode that slip lid 53 drives main shaft 51 to move is also very much, can such as be set on main shaft 51 around its outer Monday The annular groove in week, slip lid 53 is extend by a pin or steel wire ring in annular groove to be connected with main shaft 51, neither influences main shaft in this way 51 rotation nor affects on the movement that slip lid 53 drives main shaft 51.

The edge of slip lid 53 is equipped with guide rail 531, and corresponding casing 1 is equipped with guide groove 15, and slip lid 53 passes through its guide rail 531 It can slide axially in guide groove 15 relative to casing 1.It is of course also possible to be that guide groove is set on slip lid 53, casing 1 The mode of upper setting guide rail causes slip lid to move.In addition, the both sides outside slip lid 53 are provided with the tread plate 537 of concave or convex, Operator's finger is blocked when slip lid 53 moves and can prevent from skidding.

Work head storage folder 52 is rotatably supported between toothed wheel box cover plate 223 and front housing 13, work head storage folder 52 Its circumferencial direction of upper edge is evenly distributed with multiple work head receiving storehouses 521, and work head accommodates storehouse 521 and stores 52 axis of folder along work head It is closed to a part, a part of excircle opens wide so that it is convenient to which operator selects from open part can hold very much during work head 9 The shape on 9 head of work head is easily seen, so as to quickly select the work head 9 needed.Certainly, those skilled in the art are easy to think It arrives, work head receiving storehouse 521 can also be totally enclosed, need to be only identified in corresponding position or directly by work head Storage folder 52 is made transparent, can facilitate identification.Furthermore it is possible to work head storage folder 52 and toothed wheel box cover plate 223 it Between carry out flexibly positioned, i.e., correspond to the position of work head 9 on 52 end faces in face of toothed wheel box cover plate 223 of work head storage folder and set Groove is put, the steel cap or shrapnel compressed by spring is set on toothed wheel box cover plate 223, then, work head storage folder 52 often turns over One work head 9 can all send out steel cap or shrapnel falls into the voice prompt of groove, so as to which more convenient operator selects work First 9, and because these positions are pre-set, angle and the main shaft 51 that 52 rotation of folder can be stored to avoid work head are wrong It opens.Foregoing is to select different work heads by way of storing folder rotation, naturally it is also possible to by storing intermediate straight line The mode of movement, such as work head are arranged side by side along the radial direction of storage folder, select just to need radially to push to deposit during work head Chu Jia.In addition storage folder is axial restraint in the preferred embodiment of the present invention, is axially moved by main shaft and drives work head Work into output shaft, naturally it is also possible to be arranged to main shaft axial restraint, by store folder axial movement rotate again or Person is moved radially in a manner of selecting work head, and the fast of work head can be realized without removing work head so as to can also realize Speed is replaced.

The front end of main shaft 51 is equipped with magnet 511, for adsorbing work head 9, when selecting good berth head 9, and operable slip lid 53 drive main shaft 51 to pass through the work head receiving storehouse 521 for accommodating the work head 9, and work head 9 is inhaled by the magnet 511 on main shaft 51 It is attached, and work head receiving storehouse 521 is left under the promotion of main shaft 51, into output shaft 4.When work, main shaft 51 drives defeated Shaft 4 rotates, and output shaft 4 drives work head 9 to rotate.

Electric screw driver needs work head 9 being axially pressed on screw or workpiece when being operated, in this way Work 9 can be generated the rear shifting of main shaft 51, the present invention is solves the problems, such as that this is proposed by a reversed responsive to axial force Three kinds of solutions, illustrate individually below.

With reference to shown in Fig. 4 to Fig. 7, the place of fixed block 50 is closed on equipped with the limit for preventing main shaft 51 from retreating in the rear end of main shaft 51 Position mechanism 8, position-limit mechanism 8 include pivotable limited block 81, along the torsional spring 83 of 81 pivotal orientation of limited block bias limited block 81. One end of wherein limited block 81 resists fixed block 50, and the other end is mounted on by an axis pin 82 on gear-box 22 or on casing 1, The axis of axis pin 82 is parallel to the axis of main shaft 51, and limited block 81 can be rotated around axis pin 82 in the range of certain angle.It turns round One end of spring 83 is fixed on limited block 81, and the other end is against on gear-box 22 or on casing 1, and the elastic force of torsional spring 83 makes limiting Block 81 is maintained at the first position (Fig. 4 and Fig. 6 shown in) to offset with fixed block 50.Such position-limit mechanism 8 is preferably provided two, It is distributed along the axisymmetrical of main shaft 51, stress balance can be kept in this way, the axial limiting for making main shaft 51 is relatively reliable.Work as needs During mobile main shaft 51, the limitation moved to main shaft 51 can be released by sliding slip lid 53.Slip lid 53 is internally provided with and limits The solution closing piece 532 that block 81 matches, solution closing piece 532 are equipped with inclined-plane 533, when slip lid 53 moves backward, inclined-plane 533 and limited block 81 side 813 contacts, and limited block 81 overcomes the elastic force of torsional spring 83 to act on around axis pin under the drive on inclined-plane 533 82 rotations, until limited block 81 is disengaged with fixed block 50, fixed block 50 is unlocked, and allows 51 axis of main shaft so as to which limited block 81 is in To the second position of movement (shown in Fig. 7).Main shaft 51 continues to move axially, and limited block 81 is stuck in the both ends of fixed block 50, this When can be carried out replace work head.It can thus be seen that elder generation sliding distance S is to release before slip lid 53 drives main shaft 51 to move The limitation that limited block 81 is axially moved main shaft 51, as long as therefore distance S meets the movement of slip lid 53 that can to release limited block 81 right The locking that main shaft 51 is axially moved.After work head is more finished changing, slip lid 53 moves forward, and drives main shaft 51 and fixed block 50 also forward Mobile, the side 813 for solving inclined-plane 533 and limited block 81 on closing piece 532 is contacted again and is separated with the Forward of slip lid 53, Limited block 81 comes back to the position axially to offset with fixed block 50 under the action of torsional spring 83, such electric screw driver work When, output shaft 4 is stretched into 51 front end of main shaft, and the fixed block 50 for being located at 51 rear end of main shaft is limited that block 81 is axial to be resisted, and leads in this way The axial movement of axis 51 is limited, i.e., main shaft 51 can not retreat, relatively reliable so as to the use of electric screw driver.

It is second of embodiment of position-limit mechanism 8 with reference to shown in Fig. 8 and Fig. 9, unlike above-mentioned position-limit mechanism 8, The axis of axis pin 82a is formed as perpendicular to the axis of main shaft 51, one end and the axis pin 82a pivot connections of limited block 81a, the other end It is hook-shaped, it hooks on fixed block 50, such fixed block 50 can also be moved backward by limitation, be led so as to which limited block 81a is in locking The first position that axis 51 is axially moved (shown in Fig. 8).Slip lid 53, which moves, makes it solve the inclined-plane 533 and limited block 81a on closing piece 532 Contact, limited block 81a inclined-plane 533 the locking that rotates and release down around axis pin 82a to fixed block 50 led, so as to limit Block 81a is in the second position that main shaft 51 is allowed to be axially moved (shown in Fig. 9).The effect of position-limit mechanism 8a is former in present embodiment Manage identical with first embodiment, which is not described herein again.

It is the third embodiment of position-limit mechanism 8 with reference to shown in Figure 10 and Figure 11, position-limit mechanism 8b includes limited block Relative to 1 axial restraint of casing, limited block 81b can be along perpendicular to the side of 51 axis of main shaft by 81b and spring 83b, limited block 81b To linear motion, one end of spring 83b is housed in limited block 81b, and the other end is connected with casing 1 or gear-box 22, spring 83b biass limited block 81b keeps it in the first position that axial direction offsets with fixed block 50 (shown in Figure 10).In present embodiment In and the inclined-plane 533 by being arranged in slip lid 53 and limited block 81b interact and fixed block 50 be axially moved to release Locking, limited block 81b overcomes the elastic force of spring 83b to be linearly moved to release the second position (Figure 11 institutes for locking main shaft 51 Show).The inclined direction on inclined-plane 533 here can be selected according to the limited block 81b directions moved, if limited block 81b is along hanging down Directly in the horizontal motion of 51 axis of main shaft, inclined-plane 533 forms flat relative to the direction of 51 axis of main shaft and vertical direction Face tilts；Limited block 81b is moved along perpendicular to the vertical direction of 51 axis of main shaft, inclined-plane 533 relative to main-shaft axis direction It is tilted with the plane that horizontal direction is formed；The limited block 81b edges direction angled with the horizontal direction perpendicular to 51 axis of main shaft Movement, such limited block 81b have along the component in horizontal and vertical both direction, thus the inclined direction on inclined-plane 533 can have it is more A selection, those skilled in the art can be easy to think of, and which is not described herein again.

Three kinds of embodiments of above-described position-limit mechanism 8 are right to release limited block 81 by the movement of slip lid 53 The locking that main shaft 51 is axially moved, because slip lid 53 also will drive main shaft 51 to move axially, thus needs slip lid 53 first to move A distance first releases the locking that limited block 81 is axially moved main shaft 51, main shaft 51 could be driven to move axially again, slip lid The first convex block 535 that 53 inside drive main shaft 51 to move is set with 50 axially spaced-apart of fixed block, and axially spaced a distance can pass through The angle of inclination on inclined-plane 533 and the maximum distance radially superposed with fixed block 50 of limited block 81 determine.Certainly, art technology Personnel in a manner that slip lid 53 moves it can also be appreciated that without that can also realize that releasing limited block 81 axially transports main shaft 51 Dynamic locking, sets the knob being connected with limited block 81 such as outside casing 1, limited block 81 is driven to overcome spring by turn knob Power rotates or movement；Either set outside casing 1 toggle that is connected with limited block 81 either button by push toggle or Pressing button can also drive limited block 81 to overcome spring force rotation or movement etc., can realize that releasing limited block 81 is right The locking that main shaft 51 is axially moved.

Furthermore it is possible to set elastic element between slip lid 53 and casing 1 or gear-box 22, slip lid 53 backs to end It can be blocked during position by the lock on casing 1, working condition can be automatically returned under elastic force when slip lid 53 is released Position.

When electric screw driver is needed to work, main shaft 51 moves forward under the drive of slip lid 53, pushes the work selected Enter output shaft 4 as head, when needing replacing work head, main shaft 51 retreats under the drive of slip lid 53, because of main shaft 51 and work The one end for making head contact is equipped with magnet 511, so the work head that main shaft 51 can drive work head to return to work head storage folder 52 is received Hold in storehouse 521.And if main shaft 51 moves after continuing, work head can be driven out, to lead to not more out of work head receiving storehouse 521 Change jobs head, if operator does not have found, rotary work head is stored when pressing from both sides 52, it is more likely that leads to the damage of tool.This hair Bright is to solve the problems, such as that this proposes two kinds of solutions, is illustrated individually below.

With reference to the first embodiment shown in Fig. 3 and Figure 12 to Figure 14, retreated for limitation work head with main shaft 51.Work Head storage folder 52 is equipped with pressing plate 522 in face of one end of gear-box 22, and pressing plate 522 can together be revolved as work head stores folder 52 Turning, pressing plate 522 can store folder 52 integral types setting with work head, can also be provided separately, and present embodiment is preferably provided separately, Both processing had been facilitated, also easily assembling.The position that pressing plate 522 corresponds to work head receiving storehouse 521 is equipped with opening 523, for across master Axis 51 is provided with U-type groove 526 in opening 523 on the end face of work head storage folder 52, U-shaped for accommodating U-shaped spring 56 It with opening 523 is Chong Die that spring 56, which has part in free state, and the design of U-type groove 526 is to the flexible deformation of U-shaped spring 56 It is reserved with space.Because the quantity in currently preferred work head receiving storehouse 521 is 6, corresponding 523 quantity that are open also are 6 A, the quantity of U-type groove 526 and U-shaped spring 56 is similarly 6, and certain those skilled in the art are it is readily conceivable that opening 523, U Type groove 526 and U-shaped spring 56 can also only set one, i.e. pressing plate 522 is fixedly installed relative to gear-box 22, such main shaft 51 It is same opening 523 to pass through every time, does not interfere with rotary work head storage folder 52 to select work head.When main shaft 51 retreats And when being moved backward under the action of magnet 511 with work head, the U-shaped meeting of spring 56 flexible deformation is stuck on main shaft 51, i.e., U-shaped Spring 56 is in the first position that main shaft 51 is allowed to move (with reference to Figure 13).Because main shaft 51 connects end and the work of work head The end of head connection main shaft 51 all has chamfering or rounding, when opening for pressing plate 522 is left in the end that main shaft 51 connects work head 9 When mouthfuls 523, U-shaped spring 56 replys free state, and 522 part of being open is blocked, work head 9 with main shaft 51 continue to retreat when Stopped by U-shaped spring 56, i.e., U-shaped spring 56 is in the second position that limitation work head 9 retreats (with reference to Figure 14).Main shaft 51 in this way It is separated with work head 9, arbitrarily rotary work head storage can press from both sides 52 another work head 9 needed with selection.In power spiral shell When silk knife work, U-shaped spring 56 causes resistance to the rotation of main shaft 51 in order to prevent, can axially correspond to U on main shaft 51 It is set at the position of type spring 56 around the main shaft annular groove of 51 1 weeks 512, spring 56 U-shaped in this way will not be to the rotation of main shaft 51 Turn to cause to interfere.

With reference to second of the embodiment shown in Figure 15 to Figure 17, retreated for limitation work head 9 with main shaft 51.Gear box cover A shrapnel 57 is fixed on plate 223, shrapnel 57 is arranged between work head storage folder 52 and toothed wheel box cover plate 223, on shrapnel 57 Equipped at least one elasticated end 571,571 part of elasticated end is stretched into the hole on toothed wheel box cover plate 223, passes through elasticity in this way The flexible deformation of end 571 can also be realized and block work head 9, prevent main shaft 51 from work head 9 being driven to leave work head when retreating Storage folder 52.With reference to Figure 16, elasticated end 571 is in the first position that main shaft 51 is allowed to move；With reference to Figure 17, elasticated end 571 in the second position that limitation work head 9 retreats.According to the present embodiment, those skilled in the art are it is readily conceivable that can be with Directly elasticated end 571 is stuck on toothed wheel box cover plate 223 or set rigid fixinig plate, fixinig plate can be made by elasticity It is moved between hole Liang Ge positions on toothed wheel box cover plate 223 with the hole on partial occlusion toothed wheel box cover plate 223 and leaving.

Under normal circumstances, the axially disposed interior hexagonal hole of output shaft 4, so that the work head 9 for driving six sides rotates.But such as When fruit work head 9 enters output shaft 4 under the drive of main shaft 51, if six side's external forms of work head 9 and hexagonal hole in output shaft 4 Angle is staggered, and can bring big inconvenience to operator.The generation of such case in order to prevent, the present invention is to the knot of output shaft 4 Structure is improved, and is the first embodiment of output shaft 4 with reference to shown in Figure 18 to Figure 19, output shaft 4 is axially disposed logical Hole 41, the torque transfer part for the torque of output shaft 4 to be passed to work head 9 is equipped in through-hole 41 and drive work head with The correction unit that torque transfer part matches, torque transfer part are at least one radial protrusion 42 being arranged in through-hole 41, radial convex Rise 42 can with one of face of the work head 9 of six sides against and limit work head 9 and rotated relative to output shaft 4.Correction unit The inclined-plane 421 of 3 one end of transmission mechanism is closed on to be set in through-hole 41, it can be on inclined-plane when work head 9 is contacted with inclined-plane 421 Output shaft 4 or work head 9 is driven to rotate so that through-hole 41 and match with work head 9 under 421 guiding, that is to say, that inclined-plane 421 play the position of the relatively radially protrusion 42 of correction work head 9 when work head 9 enters through-hole 41, i.e. work head 9 and output shaft 4 relative rotation, so as to which the corner angle for preventing work head 9 are blocked by radial protrusion 42, so that work head 9 can smoothly enter through-hole 41 It is interior.Currently preferred inclined-plane 421 circumferentially tilts, the channeling direction of 4 relative rotation of such work head 9 and output shaft Definitely.In the present embodiment, radial protrusion 42 sets 12, is circumferentially uniformly distributed, so as to output shaft 4 Normal section is formed as the dodecagon that each protrusion is 150 degree, and dodecagon here is by between two hexagon circumferencial directions It is formed by stacking every 30 degree.When main shaft 51 push the work forward first 9 enter output shaft 4 when, if the ten of six sides of work head 9 and output shaft Two jiaos are staggered, and six angles of such work head 9 can be against on inclined-plane 421, and work head 9 moves axially, on inclined-plane 421 circumferentially Under the inclined guiding in direction, work head 9 or output shaft 4 are rotated up the angle of work head 9 and match with the through-hole 41 of output shaft 4, So as to which work head 9 smoothly enters output shaft 4.In addition, radial protrusion 42 and inclined-plane 421 can link together, radial protrusion 42 is axially extending along output shaft 4, and in this way with the contact area bigger of work head 9, the effect for transmitting torque is more preferable.Certainly, radially Protrusion 42 and inclined-plane 421 can also be provided separately, mode that axially disconnection or circumferencial direction are staggered etc..

With reference to shown in Figure 20 to Figure 21, being second of embodiment of output shaft 4, the radial protrusion 42 in through-hole 41 is only set One is put, is dodecagonal one of angle, one end setting inclined-plane 421 of same radial protrusion 42, inclined-plane 421 is along circle Circumferential direction tilt, likewise, output shaft 4 by a radial protrusion 42 with regard to work head 9 can be driven to rotate, and by one tiltedly The guiding in face 421 can also realize the rotation of work head 9 or output shaft 4 so as to which work head 9 be made smoothly to enter output shaft 4.But Work head, which accommodates, always has gap presence between storehouse 521 and work head 9, and main shaft 51 drives work head 9 to enter output shaft 4 every time Before, the axis of work head 9 and the axis of main shaft 51 being capable of the radial motions in output shaft 4 there are deviation, such work head 9 Space is with regard to very little, in order to make work head 9 empty relative to movement of the output shaft 4 with bigger when work head 9 enters output shaft 4 Between, guide part can be further set in through-hole 41, and guide part is to be arranged in through-hole 41 to close on work head storage folder 52 The interior step 43 of one end, the internal diameter of interior step 43 are more than the internal diameter of through-hole 41, pass through inclined-plane mistake between interior step 43 and through-hole 41 It crosses, the height of interior step 43 in an axial direction is substantially equal to the height of inclined-plane 421 in an axial direction, has just enter into output shaft 4 in work head 9 in this way When, work head 9 has the space of rotation or the axial movement of bigger relative to output shaft 4, more suitable hence into output shaft 4 Profit.

It is the third embodiment of output shaft 4 with reference to shown in Figure 22 and Figure 23, work head 9 enters output in order to prevent Just it is the tip of the sharp face radial protrusion 42 of peripheral six sides of work head 9 during axis 4, it can be in 4 through-hole of output shaft, 41 interior and diameter The deep gouge 45 that the position setting opposite at center to protrusion 42 is communicated with interior step 43, center is opposite to be referred herein to and radial direction The centrosymmetric point in tip of protrusion 42 is located between two sides 413 of deep gouge 45, and deep gouge 45 has what is be connected with through-hole 41 Bottom surface 411 and two sides 412, angled transition between bottom surface 411 and through-hole 41 are easily directed to work head 9 in through-hole 41, Two sides 412 circumferentially tilt, in this way when work head 9 enters the sharp face of output shaft 4 and peripheral six sides of work head 9 During the tip of radial protrusion 42,9 radial motion of work head is rotated down, while to deep gouge 45, and in leading for side 412 in bottom surface 411 lead is downwardly into through-hole 41.Ensure that work head 9 is in any angle and can smoothly enter output in this way Axis 4.

The above-described radial protrusion 42 for output shaft 4 contacts the mode that work head 9 is driven to rotate with 6 face of work head, 9 uniform force of work head, unit area stress are small in this way.Certainly, the radial protrusion 42 of output shaft 4 is contacted with 9 line of work head Work head 9 can be driven to rotate, such as：The unlimited angle for determining radial protrusion 42, as long as it can drive work head 9 to rotate, one end Inclined-plane 421 along the circumferential direction tilt, can also realize that work head 9 smoothly enters output shaft 4 in this way.

It will elaborate below to the quick-replaceable process of work head of the present invention.

With reference to shown in Fig. 1, electric screw driver is in running order, and depression of push button switch 7 can carry out twisting screw at this time Work.When needing replacing a further type of work head 9, operation slip lid 53 is moved to the direction of motor 2, and cooperation is with reference to figure Shown in 5, Fig. 8 and Figure 13, the inclined-plane 533 on slip lid 53 is contacted with a side 813 on limited block 81, with the shifting of slip lid 53 Dynamic, limited block 81 is pivoted to position shown in Fig. 9 under the action of inclined-plane 533, and limited block 81 is relieved to fixation at this time The locking that block 50 is axially moved, while slip lid 53 also moves to the position that the first convex block 535 is contacted with fixed block 50；Next after Continue to the direction of motor 2 and move slip lid 53, slip lid 53 drives main shaft 51 mobile in the same direction therewith by fixed block 50, main shaft 51 On annular groove 512 cross U-shaped spring 56, six side parts on main shaft 51 are contacted with U-shaped spring 56 and with main shaft 51 It moves afterwards and forces U-shaped 56 flexible deformation of spring, until main shaft 51 is moved to and is detached from U-shaped spring 56, U-shaped spring 56 returns back to freedom State (as shown in figure 14), slip lid 53 continues that main shaft 51 is driven to be moved to extreme position, and work head 9 can not then cross U-shaped bullet Spring 56 is so as to stay in work head storage folder 52, at this point, accommodating storehouse 521 by the work head being arranged on work head storage folder 52 Open section find the work head 9 needed replacing, rotary work head storage folder 52, by required work head 9 go to it is defeated The axially opposing position of shaft 4, i.e., position as shown in Figure 2.

Next, with continued reference to Fig. 2, resetted to the direction movement slip lid 53 of output shaft 4, slip lid 53 passes through the second convex block 536 are against drive main shaft 51 on fixed block 50 moves to the direction of output shaft 4, and main shaft 51 is equipped with one end of magnet 511 with having selected 9 tail portion of work head selected contacts and adsorbs the work head 9, and slip lid 53 drives main shaft 51 to be moved to the direction of output shaft 4, cooperation ginseng According to Figure 20, when work head 9 enters output shaft 4, under the guiding on inclined-plane 421, work head 9 smoothly enters output shaft 4, and main shaft 51 continue to move to slip lid 53, until work head 9 is exposed from the front end of output shaft 4, slip lid 53 is returned to abut with front housing 13 Position, at this point, the inclined-plane 533 on slip lid 53 is detached from limited block 81, limited block 81 be returned under elastic reaction with it is fixed The position that block 50 axially offsets, such electric screw driver have been returned to working condition shown in FIG. 1.The mistake that entire work head is replaced Journey is easy to operate, quickly, for the user, can greatly improve working efficiency.

The above-mentioned definition to each element is not limited in the various concrete structures or shape mentioned in embodiment, this field Those of ordinary skill replace while it can simply be known.Such as motor can substitute electricity with gasoline engine or diesel engine Machine；Work head can be polygon of the section for arbitrary rule；In addition, in the above embodiment, main shaft is stored with work head Moving to axial between folder can also be that main shaft is fixed, and work head storage folder can either be axially moved and can also rotate, And main shaft can also be with motor shaft coaxial arrangement etc..In addition, position-limit mechanism is mainly used for limiting main shaft axial movement, to it Structure simultaneously has no special requirements, and the interior of visual difference casing accordingly changes configuration, can increase new element, can also Reduce unnecessary element.

Claims

1. a kind of power tool, including：

Casing；

Motor is arranged in casing, for providing rotary power；

Main shaft, for driving the rotation of one of several work heads；

Transmission mechanism is arranged between motor and main shaft and can the rotary power that motor exports be passed to main shaft；

Storage folder, the receiving storehouse including being used to accommodate several work heads, the main shaft can be axially moved, so as in across The release mode for accommodating the operating mode in storehouse and being detached with receiving storehouse；

It is characterized in that, the power tool further includes the operating parts being set on casing, the operating parts can drive described Main shaft is axially moved, the storage folder include the first part that is housed in the casing and covered by the operating parts and The second part exposed as operating parts is mobile.

2. power tool as described in claim 1, it is characterised in that：The operating parts can be axially moveable.

3. power tool as claimed in claim 2, it is characterised in that：The operating parts and casing alternative one, which are equipped with, to be oriented to Another of both slot, the operating parts and casing are equipped with the guide rail to match with guide groove, and the operating parts passes through described Guide rail is moved in guide groove and is moved relative to chassis axial.

4. power tool as described in claim 1, it is characterised in that：The operating parts can relatively described main axle moving.

5. power tool as claimed in claim 4, it is characterised in that：The operating parts have spaced first convex block and Second convex block, the main shaft are equipped with fixed block, and the fixed block is relative to main shaft axial restraint, first convex block or second The operating parts and main shaft are synchronized with the movement when convex block is abutted with fixed block, and the fixed block is located at first convex block and second convex When between block, the operating parts and the main shaft relative motion.

6. power tool as described in claim 1, it is characterised in that：The casing includes the motor equipped with motor in an axial direction Portion, the driving section equipped with transmission mechanism, the operating parts are least partially overlapped with the driving section and motor part in an axial direction.

7. power tool as claimed in claim 6, it is characterised in that：The casing further includes the storage part equipped with storage folder, When the main shaft is in operating mode, the operating parts is axial least partially overlapped with the driving section, motor part and storage part； When the main shaft is in release mode, the operating parts axially partly overlaps with the motor part and driving section.

8. power tool as claimed in claim 6, it is characterised in that：The atop part of the operating parts cladding casing and part Side.

9. power tool as described in claim 1, it is characterised in that：The power tool further includes to connect work head Output shaft, the transmission mechanism deliver torque to output shaft by the main shaft, so as to output shaft driving work head rotation Turn.

10. power tool as described in claim 1, it is characterised in that：The power tool, which further includes, is arranged on casing and master Position-limit mechanism between axis, the axial movement of the operating parts is operable to drive position-limit mechanism to convert between the two states, In first state, the main direction axially away from work head of position-limit mechanism limitation moves；In the second state, the position-limit mechanism The main direction axially away from work head is allowed to move.

11. power tool as claimed in claim 10, it is characterised in that：The operating parts at least partly covers the position restrainer Structure.

12. a kind of power tool, including：

Casing；

Motor is arranged in casing, for providing rotary power；

Main shaft, for driving the rotation of one of several work heads；

It is characterized in that, the power tool further includes the operating parts being set on casing, the operating parts can be at first It puts and is moved between the second position and the main shaft can be driven to be axially moved, in first position, the main shaft is in Working mould Formula, a part for the operating parts covering storage folder, in the second position, the main shaft is in release mode, the storage A part for folder is exposed.

13. power tool as claimed in claim 12, it is characterised in that：The casing includes the motor equipped with motor in an axial direction Portion, the driving section equipped with transmission mechanism, the operating parts are least partially overlapped with the driving section and motor part in an axial direction.

14. power tool as claimed in claim 13, it is characterised in that：The casing further includes the storage equipped with storage folder Portion, when the main shaft is in operating mode, the operating parts is axial at least partly heavy with the driving section, motor part and storage part It is folded；When the main shaft is in release mode, the operating parts axially partly overlaps with the motor part and driving section.

15. power tool as claimed in claim 13, it is characterised in that：The atop part of the operating parts cladding casing and portion Divide side.

16. power tool as claimed in claim 12, it is characterised in that：The power tool, which further includes, is arranged on casing and master Position-limit mechanism between axis, the axial movement of the operating parts is operable to drive position-limit mechanism to convert between the two states, In first state, the main direction axially away from work head of position-limit mechanism limitation moves；In the second state, the position-limit mechanism The main direction axially away from work head is allowed to move.

17. power tool as claimed in claim 16, it is characterised in that：The operating parts at least partly covers the position restrainer Structure.

18. power tool as claimed in claim 12, it is characterised in that：The operating parts can relatively described main axle moving.

19. power tool as claimed in claim 18, it is characterised in that：The operating parts has spaced first convex block With the second convex block, the main shaft is equipped with fixed block, and the fixed block is relative to main shaft axial restraint, first convex block or the Two convex blocks when being abutted with fixed block the operating parts and main shaft be synchronized with the movement, the fixed block is located at first convex block and second When between convex block, the operating parts and the main shaft relative motion.