CN101758478A - Power tool - Google Patents
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- CN101758478A CN101758478A CN200910006650A CN200910006650A CN101758478A CN 101758478 A CN101758478 A CN 101758478A CN 200910006650 A CN200910006650 A CN 200910006650A CN 200910006650 A CN200910006650 A CN 200910006650A CN 101758478 A CN101758478 A CN 101758478A
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- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims description 32
- 230000008859 change Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 description 23
- 238000010586 diagram Methods 0.000 description 14
- 230000006378 damage Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
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Abstract
The invention discloses a power tool, comprising a machine shell, a motor, an output shaft, a planetary gear transmission mechanism and a torque control system, wherein the motor is arranged in the machine shell and outputs rotary power; the planetary gear transmission mechanism is arranged between the motor and the output shaft to transfer the rotary output of the motor to the output shaft and comprises gear rings; and the torque control system is used for detecting the torque borne by the gear rings, judges whether the detected torque is more than or equal to the preset torque value of the power tool, and stops power supply of the motor if so, thus avoiding the power tool self or materials and workpieces from being damaged.
Description
Technical field
The present invention relates to a kind of power tool, especially have the power tool of screwdriver function.
Background technology
Power tool with screwdriver function, wireless rifle for example, electric screw are criticized etc., be widely used in the various field, such as building, house decoration, factory work or the like.
According to the needs of the scope of application, institute's material processed of screw screwdriver bit or the character such as workpiece of being processed, power tool can not surpass certain moment of torsion when realizing the screwdriver function, otherwise can cause the damage of power tool itself or material, workpiece.
In order to prevent to make the power tool damage owing to surpassing the moment of torsion of setting, the destruction of perhaps causing material or workpiece has produced the electric screw with mechanical clutch and has criticized in the prior art.For example U.S.'s bulletin patent US5277527 discloses a kind of screwdriver, and this screwdriver is provided with motor, the planetary gear reducing mechanism that is connected with motor output shaft, the main shaft that is connected with planetary gear reducing mechanism, and the screw screwdriver bit that is connected with main shaft.Mechanical clutch is arranged on the planetary gear reducing mechanism, and clutch comprises internal gear, steel ball, packing ring and flexible member.Inner gear housing is located on the planetary gear, in axial direction extends the end tooth on a plurality of bands inclined-plane on the end face of internal gear, forms axially extended internal tooth on the inwall of internal gear, and internal tooth is used for and planetary axially extended external tooth engagement.Steel ball and packing ring are arranged in the torsion setting cover, and steel ball is arranged between the end face of packing ring and internal gear, and flexible member is resisted against steel ball on the end face of internal gear.
Screwdriver is before work, earlier be covered with required surely torque value with torsion setting, during screwdriver work, motor output shaft produces rotation, drive planetary gear reduction system, main shaft generation rotation, thereby drive the screw screwdriver bit and turn screw, load torque passes to planetary gear reducing mechanism, ring gear, steel ball, flexible member through the screw screwdriver bit.When load torque during greater than the elastic force of the flexible member of pressing pressing steel balls, when promptly reaching the moment of torsion of setting, steel ball just overcomes the elastic force of flexible member, cross the end tooth of ring gear, make ring gear produce rotation, at this moment, the moment of torsion transmission between motor output shaft and the screw screwdriver bit is interrupted.
Such mechanical clutch can not be when moment of torsion reaches setting value; hard stop; constantly the clutch that impacts acts on screwdriver; the torque value that makes workpiece is greater than setting value; thereby only can realize the setting of coarse relatively peak torque; the setting of this moment of torsion also can only classification be regulated, and mechanical clutch can produce mechanical wear, and capable transmission is descended along with the continuous wearing and tearing of mechanical clutch.Be adjusted under the situation of peak torque, clutch separates less than given moment of torsion the time sometimes, separates greater than the setting moment of torsion time sometimes, thereby also can cause the damage of screwdriver itself or material, workpiece.
U.S. bulletin patent US4231270 has disclosed and has utilized microswitch (micro switch) combine with mechanical clutch to realize moment of torsion control, thereby reaches when setting value at moment of torsion, and the shutoff motor prevents the damage of screwdriver itself and workpiece, material.Owing to use microswitch, when operation, on make and break contact, can produce spark etc., not only cause the wearing and tearing of contact, also can bring various drawbacks to the electronic component of periphery or electronic circuit etc.This mechanical switch not only can exert an influence to the life-span of whole power tool, power tool integral body is carried out miniaturization also can have a lot of restrictions textural.
Britain bulletin patent GB2328634B discloses a kind of utilization and has been arranged on permanent magnet (permanent magnet) and the Hall element (Hall sensor) that is arranged on the casing on the ring gear, carries out the moment of torsion control of screwdriver in conjunction with mechanical clutch.When load torque during greater than the elastic force of the spring in the mechanical clutch; the ring gear of mechanical clutch can rotate; the permanent magnet that drive is arranged on the ring gear rotates together; Hall element is sensed the rotation of permanent magnet; just signal being passed to motor makes and motor shutdown prevents the damage of screwdriver itself and workpiece, material.Because this torque detecting unit need combine with mechanical clutch, the mechanical clutch drawback of wearing and tearing easily still exists, be adjusted under the situation of peak torque, mechanical clutch separates less than given moment of torsion the time sometimes, greater than the setting moment of torsion time, separate sometimes, thereby also can cause the damage of screwdriver itself or material, workpiece.
Summary of the invention
Technical problem to be solved by this invention is: a kind of power tool with torque control system is provided.
Technical scheme of the present invention is: a kind of power tool comprises casing; Be arranged on the motor in the casing, described motor outputting rotary power; Output shaft; Be arranged between motor and the output shaft with the rotation output with motor and be delivered to planetary gear mechanism on the output shaft, planetary gear mechanism comprises gear ring; Torque control system; Described torque control system is used to detect the torque value that described gear ring is subjected to, and whether the moment of torsion that judge to detect is more than or equal to the predetermined torque value of power tool, if more than or equal to the default torque value of power tool,, described torque control system supplies with just stopping the power supply of motor.
Wherein, described gear drive comprises at least one group of gear train, and described gear train comprises planet circular system, and described planet circular system comprises several rows star-wheel and the planet carrier that is used to support planetary gear, and described gear ring is connected with described planetary gear profile of tooth; Described torque control system detects the suffered moment of torsion of gear ring in real time with hand; Described torque control system comprises torque detecting unit and the processing unit that is electrically connected with torque detecting unit.
Wherein, described torque detecting unit comprises the sensor that is fixedly installed on the casing, be connected with gear ring and when gear ring moves and with respect to the detection piece of sensor movement, described sensor generates the signal that characterizes described gear ring movement change amount according to the movement change amount of detected detection piece, and passes to described processing unit; Described processing unit is used for the moment of torsion according to the calculated signals gear ring that receives, and at moment of torsion during greater than the torque value set, output signal stops motor power and supplies with.
Wherein, described detection piece is done axially-movable with respect to output shaft.
Described power tool also comprises the sphere push rod that is fixedly installed togather with detection piece, and is set in the flexible member on the detection piece; An end face of described gear ring is provided with the inclined-plane, and described sphere push rod is pressed on the inclined-plane; When output shaft is delivered to that moment of torsion reaches certain value on the gear ring, the gear ring rotation, and by the moving sphere push rod of clinohedral and detection piece with respect to sensor movement; Described sensor is a photoelectric sensor, and described detection piece is an anti-dazzling screen; Described sensor is a magnetic coder, and described detection piece is a magnetic sheet.
Wherein, described detection piece rotates with respect to output shaft.
Described power tool also comprises flexible member, and described flexible member one end is fixedly installed on the flexible member on the gear ring, and the other end is fixedly installed on the casing; When output shaft is delivered to moment of torsion on the gear ring when reaching certain value, the gear ring rotation, and drive flexible member simultaneously and produce and reverse, drive detection piece and rotate with respect to sensor; Described sensor is a photoelectric sensor, and described detection piece is the blanking disc of annular; Described sensor is a magnetic coder, and described detection piece is the disk of annular.
Wherein, described torque detecting unit comprises the pressure sensor that is arranged in the casing, is evenly equipped with a plurality of projectioies on the outer circumference surface of described gear ring, and described pressure sensor is resisted against on one of the described projection.
Described torque control system also comprises the torque setting unit that is electrically connected with processing unit, and described torque setting unit is used to set numerical value, and described processing unit can convert the numerical value that the torque setting unit is set to the predetermined torque value and be stored in the processing unit.
Described torque control system also comprises the torque setting unit that is electrically connected with processing unit, and described torque setting unit is used to set the predetermined torque value, and described processing unit is used to store the predetermined torque value.
The invention has the beneficial effects as follows: torque control system of the present invention is measured the suffered moment of torsion of ring gear by torque detecting unit, rotate as long as ring gear is stressed, torque detecting unit just can be sensed pulse signal in real time, by with the processing unit acting in conjunction, detect the suffered moment of torsion of ring gear in real time.When torque value that the suffered moment of torsion of detected gear ring is set greater than power tool, the power supply that can stop motor being supplied with, and has avoided the damage of power tool itself or material, workpiece.
Description of drawings
The present invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the partial sectional view of power tool first embodiment of the present invention.
Fig. 2 is the cutaway view of running part among Fig. 1.
Fig. 3 is the partial enlarged drawing of part shown in the C among Fig. 2.
Fig. 4 is along the schematic diagram of direction shown in the B among Fig. 3.
Fig. 5 is along the schematic diagram of direction shown in the A among Fig. 3.
Fig. 6 is the functional-block diagram of power tool first embodiment of the present invention.
Fig. 7 is the partial sectional view of power tool second embodiment of the present invention.
Fig. 8 is the partial enlarged drawing of part shown in the E among Fig. 7.
Fig. 9 is along the schematic diagram of direction shown in the B ' among Fig. 8.
Figure 10 is along the schematic diagram of direction shown in the A ' among Fig. 8.
Figure 11 is the structural representation of anti-dazzling screen among Fig. 7.
Figure 12 is the functional-block diagram of power tool second embodiment of the present invention.
Figure 13 is the partial sectional view of power tool the 3rd embodiment of the present invention.
Figure 14 is the schematic diagram of the touch-switch among Figure 13.
Figure 15 is the schematic diagram of dial among the 3rd embodiment.
Figure 16 is the cutaway view of running part among Figure 13.
Figure 17 is the partial enlarged drawing of part shown in the F among Figure 16.
Figure 18 is the schematic diagram of anti-dazzling screen among Figure 16.
Figure 19 is the schematic diagram of anti-dazzling screen among Figure 16.
Figure 20 is the functional-block diagram of power tool the 3rd embodiment of the present invention.
Figure 21 is the partial sectional view of power tool the 4th embodiment of the present invention.
Figure 22 is the partial enlarged drawing of part shown in the G among Figure 21.
Figure 23 is the structural representation of disk among Figure 21.
Figure 24 is the partial sectional view of power tool the 5th embodiment of the present invention.
Figure 25 is along the cutaway view of direction shown in the H-H among Figure 24.
Wherein:
1. housing 2. motors 3. power supplys 4. gear drives
41. first planetary gear, 42. first planet carriers, 43. second planetary gears, 44. second planet carriers
45. the third line star gear 46. the third line star framves 47, first gear ring 48, second gear ring
6. switch 7. output shafts 8. ring-type elements 81. teeth
9. fore shell 91. grooves 92. detents 93. grooves
10. back cover 11. the 3rd gear ring 111. grooves 112. projectioies
12. torque detecting unit 121. photoelectric sensors 1211. light 122. anti-dazzling screens
1221. through hole 123. sphere push rods 124. flexible members 13. printed substrates
15. torque setting unit 16. potentiometers, 161. teeth, 17. supports
30. torque detecting unit 301. magnetic coders 302. magnetic sheets 303. sphere push rods
304. flexible member 31. torque setting unit 32. anti-dazzling screens, 321. through holes
33. photoelectric sensor 34. supports 51. torque detecting units 511. photoelectric sensors
512. blanking disc 5121. through holes 5122. light tight striped 513. flexible members
60. torque detecting unit 601. magnetic coders 602. disks 61. torque detecting units
611. pressure sensor
The specific embodiment
To shown in Figure 6, is the structural representation of power tool first embodiment of the present invention referring to Fig. 1.A kind of power tool comprises housing 1, is arranged on the motor 2 in the housing 1, the supply power 3 of motor 2, starts or stops main switch 6, planetary gear mechanism 4 and the output shaft 7 of motor 2.Gear drive 4 is arranged in the gear-box, and gear-box comprises fore shell 9 and back cover 10.Planetary gear mechanism 4 comprises first planetary gearsets of being made up of first planetary gear 41 and first planet carrier 42, first gear ring 47, second planetary gearsets of forming by second planetary gear 43 and second planet carrier 44, second gear ring 48, the third line star gear train of forming by the third line star-wheel 45 and the third line star frame 46, the 3rd gear ring 11.Output shaft 7 is fixedly mounted on the third line star frame 46.
The inner surface of the 3rd gear ring 11 forms internal tooth, the external tooth engagement of internal tooth and the third line star-wheel 45.The 3rd gear ring 11 forms the inclined-plane on the end face of the direction of output shaft 7.
Power tool also comprises torque control system, and torque control system comprises torque setting unit 15, torque detecting unit 12, data converting circuit, processing unit and the control performance element of mutual electrical connection.
Data converting circuit is arranged on the printed substrate 13 (pcb board).This data converting circuit is the industry common circuit, repeats no more herein.Data converting circuit comprises two change-over circuits, i.e. first data converting circuit, second data converting circuit.First data converting circuit is used to receive resistance or the pulse signal changing value from the torque setting unit, and second data converting circuit is used to receive the pulse signal changing value from torque detecting unit.
Processing unit is arranged on the printed substrate 13.Processing unit can adopt MCU or DSP etc.In the present embodiment, processing unit is a microcomputer control system (MCU).What it may occur to persons skilled in the art that is, MCU has generally included CPU (CPU), read-only storage (ROM), random access memory (RAM) etc., because the operation principle of these unit is well known to those of ordinary skill in the art, repeats no more herein.
The control performance element is arranged on the printed substrate, and the control performance element is controlled by processing unit, comes the power of actuating motor to turn-off.Because the operation principle of control performance element is well known to those of ordinary skill in the art, repeats no more herein.
Referring to shown in Figure 1, torque setting unit 15 comprises a ring-type element 8 and is arranged on potentiometer 16 (potentiometer) on the fore shell 9 rotationally.This ring-type element 8 is set on the fore shell 9, forms tooth 81 on the inwall of ring-type element 8.Be set with support 17 on fore shell 9, potentiometer 16 is arranged on the support 17 rotationally, and the excircle of potentiometer 16 is provided with tooth 161, the tooth 161 of potentiometer 16 and 81 engagements of the tooth of ring-type element 8.In the present embodiment, potentiometer 16 is a rotary variable resistor.When needs are set moment of torsion, the operator rotates ring-type element 8 by hand, the rotating band electrokinetic potential device 16 of ring-type element 8 is rotated, the resistance value of potentiometer 16 just can change, resistance change passes to processing unit by first data converting circuit, processing unit is converted into torque value through calculating, and promptly draws the setting moment of torsion of power tool.
In the present embodiment, anti-dazzling screen 122 comprises a plurality of through holes 1221 of even setting.
Referring to Fig. 4 and shown in Figure 5, after the power tool start, send Ray Of Light 1211 from photoelectric sensor 121, when power tool is worked, when the moment of torsion that is delivered to the 3rd gear ring 11 by output shaft 7 arrives certain value (the certain value in this place is meant and overcomes the required torque value of flexible member 124 initial torsion), the 3rd gear ring 11 rotates, the inclined-plane of the 3rd gear ring 11 compresses spherical push rod 123, make anti-dazzling screen 122 move with respect to photoelectric sensor 121 straight lines along the direction shown in the K, be that anti-dazzling screen 122 is done axially-movable with respect to output shaft 7, at this moment, light 1211 can be covered by anti-dazzling screen 122, perhaps pass the through hole 1221 of anti-dazzling screen 122, the quantity of the through hole 1221 that photoelectric sensor 121 records pass through, and (displacement is represented in each pulse to generate corresponding pulse signal, be displacement/pulse), this signal passes to processing unit by second data converting circuit, processing unit is through calculating, pulse signal is converted into corresponding displacement, being the displacement of flexible member 124, equally also is the displacement of the 3rd gear ring 11.For example, photoelectric sensor 121 generates n pulse signal, and the displacement computing formula is: displacement=n * displacement/pulse.
Then, processor multiplies each other according to the rigidity (power/length) of flexible member 124 and displacement and obtains the suffered pressure F1 of flexible member 124, calculate the power F2 that 11 pairs of sphere push rods 123 of the 3rd gear ring apply by the inclined-plane computing formula then, power F2 is vertical with the radius of gyration of the 3rd gear ring 11.Take advantage of the radius of gyration of the 3rd gear ring 11 to calculate the suffered moment of torsion of the 3rd gear ring 11 according to power F2 then, promptly drawing needs the torque value measured.
Wherein, the inclined-plane computing formula is the general formula of industry, and for example, setting the inclined-plane of gear ring and the angle of horizontal plane is α, and the rigidity of flexible member is P, and P ' is an equivalent friction angle, then the suffered power F2=F1/tag of gear ring (α+P ').
Referring to shown in Figure 6, be the power tool first embodiment functional-block diagram of the present invention.After switch 6 closures, the processor electrification reset, carry out initialization action (step 191), the operator rotates ring-type element 8 then, make potentiometer 16 produce rotation, the resistance value of potentiometer 16 changes (step 192), and this resistance change passes to processing unit (step 193) by first data circuit, processing unit is converted into torque value (step 194) by calculating with resistance value, and new torque setting value is deposited in first internal memory (step 195) of processing unit.At this moment, power tool start working (step 196), photoelectric sensor 121 detects the movement change amount of anti-dazzling screen 122 in real time, and generation in real time characterizes the signal of the 3rd gear ring 11 movement change amounts, this signal passes to processing unit by second data converting circuit, processing unit reads the detected value (step 197) of photoelectric sensor 121 in real time, and be converted into second internal memory (step 198) that torque value deposits processing unit in, processing unit is measured torque value more in real time whether more than or equal to setting torque value (step 199), if not, then proceed next step, power tool can work on (step 200); If then processing unit is passed to the control performance element with signal, cut off motor power and supply with (step 201).
Referring to Fig. 7 to Figure 12, be the second embodiment of the present invention.In this embodiment, the structure of data converting circuit, processing unit and control module is identical with first embodiment with operation principle, repeats no more herein.
In the present embodiment, torque setting unit 30 also can use the torque setting unit 15 among first embodiment.
Referring to Fig. 9, shown in Figure 10, magnetic sheet 302 is provided with many group S, N magnetic pole, and magnetic pole can be printed on the surface of magnetic sheet 302, also can be arranged on the magnetic sheet 302 by sintering, also can be arranged on the magnetic sheet 302 by the mode of spray magnetic.The known set-up mode of those skilled in the art all belongs to design scope of the present invention.
During power tool work, when the moment of torsion that is delivered to the 3rd gear ring 11 by output shaft 7 arrives certain value, the 3rd gear ring 11 rotates, the inclined-plane of the 3rd gear ring 11 compresses spherical push rod 303, make magnetic sheet 302 move relative to magnetic coder 301 straight lines along the direction shown in the M, be that magnetic sheet 302 is done axially-movable with respect to output shaft 7, be arranged on the S on the magnetic sheet 302, the N magnetic pole just moves relative to magnetic coder 301 successively, at this moment, magnetic coder 301 is noted the number of the S utmost point that passes through or the N utmost point and production burst signal, and (displacement is represented in each pulse, be displacement/pulse), this signal passes to processing unit by second data converting circuit, and processing unit is converted into corresponding displacement through calculating with pulse signal, this displacement is the displacement of flexible member 304, equally also is the displacement of the 3rd gear ring 11.Multiply each other according to the rigidity (power/length) of flexible member 304 and displacement then and obtain the suffered pressure of flexible member 304, calculate the power that 11 pairs of sphere push rods 303 of the 3rd gear ring apply by the inclined-plane computing formula then, take advantage of the radius of gyration of the 3rd gear ring 11 to calculate the suffered moment of torsion of the 3rd gear ring 11 according to power then, promptly drawing needs the torque value measured.
Referring to shown in Figure 12, be the power tool second embodiment functional-block diagram of the present invention.Behind switch closure, the processor electrification reset, carry out initialization action (step 361), processing unit reads the torque value of last time setting (step 362) in the internal memory afterwards, the operator rotates ring-type element 8 then, make anti-dazzling screen 32 produce and produce rotation with respect to photoelectric sensor 33, photoelectric sensor 33 inductive impulses change (363), the pulse change signal passes to processing unit by first data converting circuit, processing unit is by calculating the torque value that pulse change is converted into detected variation, the torque value that changes can be positive number, also can be negative (step 364), change torque value and add that last time setting value just was the torque value (step 365) of new settings, the torque value of new settings is deposited in first internal memory (step 366) of processing unit.At this moment, power tool start working (step 367), magnetic coder 301 detects the movement change amount of magnetic sheet 302 in real time, and generation in real time characterizes the signal of the 3rd gear ring 11 movement change amounts, this signal passes to processing unit by second data converting circuit, processing unit reads the detected value (step 368) of magnetic coder in real time, and be converted into second internal memory (step 369) that torque value deposits processing unit in, and whether measure torque value more in real time more than or equal to setting torque value (step 370), if not, then proceed next step, power tool can work on (step 371); If then processing unit is passed to the control performance element with signal, cut off motor power and supply with (step 372).
To shown in Figure 20, is power tool the 3rd embodiment of the present invention referring to Figure 13.In the present embodiment, the structure of data converting circuit, processing unit and control module is identical with first embodiment with operation principle, repeats no more herein.
Utilize touch-switch 521, operator's button 523,524 of operating and setting torque value easily sets torque value, and the torque value of setting is delivered to first internal memory of processing unit by first data converting circuit.In the present embodiment, torque setting unit 52 also can use the torque setting unit among first embodiment or second embodiment.
Torque detecting unit 51 comprises the sensor that is fixedly installed on the back cover 11, and sensor is preferably photoelectric sensor 511, is fixedly installed on the detection piece on the 3rd gear ring 11, and detection piece is preferably the blanking disc 512 of annular.In the present embodiment, the 3rd gear ring 11 is provided with groove 111 towards the end face of output shaft 7, a free end of flexible member 513 is arranged in the gear ring groove 111, and the main body of flexible member 513 is set on the fore shell 9, and another free end of flexible member 513 is fixedly installed on the fore shell 9.In the present embodiment, flexible member 513 is a torsion spring.Referring to shown in Figure 16, blanking disc 512 comprises a plurality of through holes 5121 that evenly are arranged on the circumference.Referring to shown in Figure 19, blanking disc 512 also can use light transmissive material to make, and evenly is provided with a plurality of lighttight stripeds 5122 on the circumference of blanking disc 512.
During power tool work, when the moment of torsion that is delivered to the 3rd gear ring 11 by output shaft 7 arrives certain value, the 3rd gear ring 11 rotates, the rotating band dynamic elasticity element 513 of the 3rd gear ring 11 produces and reverses, drive blanking disc 512 simultaneously and rotate with respect to photoelectric sensor 511, promptly blanking disc 512 rotates with respect to output shaft 7.The light that photoelectric sensor 511 sends just can be covered by anti-dazzling screen 512, perhaps pass the through hole 5121 of anti-dazzling screen 512, photoelectric sensor 511 is noted the number of the through hole 5121 that passes through and production burst signal, and (angular displacement is represented in each pulse, be angular displacement/pulse), this signal passes to processing unit by second data converting circuit, processing unit is through calculating, pulse signal is converted into the corresponding angular amount, multiplying each other according to the rigidity (moment of torsion/angle) of flexible member 513 and angular displacement simultaneously obtains the suffered moment of torsion of flexible member 513, and promptly drawing needs the torque value measured.
Referring to shown in Figure 20, be power tool the 3rd embodiment functional-block diagram of the present invention.After switch 6 closures, the processor electrification reset, carry out initialization action (step 531), start touch-switch 521 afterwards, former setting value zero clearing (step 532) with processing unit, push touch-switch 521 then, set torque value (step 533), the torque value of new settings passes to first internal memory (step 534) of processing unit by first data converting circuit.At this moment, power tool start working (step 535), photoelectric sensor 511 detects the movement change amount of blanking disc 512 in real time, and generation in real time characterizes the signal of the 3rd gear ring 11 movement change amounts, this signal passes to processing unit by second data converting circuit, processing unit reads the detected value (step 536) of photoelectric sensor 511 in real time, and be converted into second internal memory (step 537) that torque value deposits processing unit in, and whether measure torque value more in real time more than or equal to setting torque value (step 538), if not, then proceed next step, power tool can work on (step 539); If then processing unit is passed to the control performance element with signal, cut off motor power and supply with (step 540).
The touch-switch 521 of the torque setting unit 52 of present embodiment can be replaced by the dial 55 that is electrically connected with printed substrate 13, referring to shown in Figure 15.The kind of dial is a lot, and dial is binary-coded decimal code (BCD code) (binary-coded decimal) dial and use eaily.
Referring to shown in Figure 15, among the figure four decimal system input dial groups of four binary-coded decimal dial splicings.Every dial has zero to 90 positions, and each position all has corresponding digital to show, represents the decimal number of dial input.Therefore, every dial can be represented a decimal number.Need several decimal numbers can select several BCD dial-up dish splicings.
There are five contacts binary-coded decimal dial back, and wherein A is an input control line, and other four is the binary-coded decimal output signal line.When dial pushes diverse location, input control line A respectively with four binary-coded decimal output lines in certain root or a few connections.The binary-coded decimal output line state of its connection is just in time consistent with the decimal number of dial indication.
Described dial 55 is electrically connected with processing unit.Described processing unit can detect the numerical value of binary-coded decimal dial 55 settings and convert thereof into the corresponding torque value.
To shown in Figure 23, is power tool the 4th embodiment of the present invention referring to Figure 21.In the present embodiment, the structure of data converting circuit, processing unit and control module is identical with first embodiment with operation principle, torque setting unit 15 is identical with the setting device of first embodiment, any one torque setting mode among second, third embodiment can be replaced by in torque setting unit 15, repeats no more herein.
Torque detecting unit 60 comprises the sensor that is fixedly installed on the back cover 10, and sensor is preferably magnetic coder 601, is fixedly installed on the detection piece on the 3rd gear ring 11, and detection piece is preferably the disk 602 of annular.The structure of the flexible member 603 in the present embodiment and set-up mode are identical with third embodiment of the invention, repeat no more herein.
Referring to shown in Figure 23, disk 602 comprises a plurality of S, the N magnetic pole that evenly is arranged on the circumference, and magnetic pole can be printed on disk 602 surfaces, also can be arranged on the disk 602 by sintering, also can be arranged on the disk 602 by the mode of spray magnetic.The known set-up mode of those skilled in the art all belongs to design scope of the present invention.
During power tool work, when the moment of torsion that is delivered to the 3rd gear ring 11 by output shaft 7 arrives certain value, the 3rd gear ring 11 rotates, the rotating band dynamic elasticity element 603 of the 3rd gear ring 11 produces and reverses, drive disk 602 simultaneously and rotate with respect to magnetic coder 601, promptly disk 602 rotates with respect to output shaft 7.At this moment, magnetic coder 601 is noted the number of the S utmost point that passes through or the N utmost point and production burst signal, and (angular displacement is represented in each pulse, be angular displacement/pulse), and will pass to processing unit to this signal by second data converting circuit, processing unit is through calculating, pulse signal is converted into the corresponding angular amount, and multiplying each other with angular displacement according to the rigidity (moment of torsion/angle) of flexible member 603 simultaneously obtains the suffered moment of torsion of torsion spring, and promptly drawing needs the torque value measured.
Referring to Figure 24, shown in Figure 25, be power tool the 5th embodiment of the present invention.In the present embodiment, the 3rd gear ring 11 is except forming the internal tooth with the engagement of the external tooth of planetary gear 45 on inner ring, the 3rd gear ring 11 on outer circumference surface, also be evenly equipped with a plurality of protruding 112, the three gear rings 11 by this a plurality of protruding 112 be arranged on corresponding a plurality of detent 92 matched in clearance on the fore shell 9.
In the present embodiment, the structure of data converting circuit, processing unit and control module is identical with first embodiment with operation principle, torque setting unit 15 is identical with the setting device of first embodiment, any one torque setting mode among second, third embodiment can be replaced by in torque setting unit 15, repeats no more herein.
Torque detecting unit 61 comprises the pressure sensor 611 that is fixedly installed on the casing.Referring to shown in Figure 25, the preceding groove 93 that is provided with, groove 93 communicates with detent 92.Pressure sensor 611 just is arranged in the groove 93.Pressure sensor herein can have various ways.Preferably, pressure sensor 611 can be straingauge.
During power tool work, when the moment of torsion that is delivered to the 3rd gear ring 11 by output shaft 7 arrives certain value, the 3rd gear ring 11 rotates, projection 112 on the outer circumference surface of the 3rd gear ring 11 just compresses straingauge, straingauge produces distortion, resistance value changes, resistance change passes to processing unit by second data converting circuit, processing unit is converted into the power value by the variable quantity that calculates resistance value, the power radius of gyration with the 3rd gear ring 11 on duty just draws the suffered torque value of the 3rd gear ring 11, and being needs the torque value measured.
Those of ordinary skills as can be known, the torque value that real-time detection among the above embodiment the 3rd gear ring 11 is suffered also can replace to the torque value that detects first gear ring 47 or second gear ring 48.The principle that its power supply that detects principle and cut-out motor is supplied with is all identical, repeats no more herein.
The present invention measures the suffered moment of torsion of ring gear by torque detecting unit, as long as ring gear is stressed rotates, torque detecting unit just can be sensed pulse signal in real time, by with the processing unit acting in conjunction, detect the suffered moment of torsion of ring gear in real time.When detected torque value when setting torque value, just can cut off the power supply of motor, prevent the damage of power tool itself and workpiece, material effectively.Because torque detecting unit does not need to combine with mechanical clutch, avoided the mechanical clutch drawback of wearing and tearing easily, power tool can cut off the power supply supply of motor at the torque value of setting, and has avoided the damage of power tool itself or material, workpiece.And torque control system of the present invention can detect the real-time working efficient of power tool, is the ready for operation of further optimizing power tool.
Claims (16)
1. a power tool comprises casing; Be arranged on the motor in the casing, described motor outputting rotary power; Output shaft; Be arranged between motor and the output shaft with the rotation output with motor and be delivered to planetary gear mechanism on the output shaft, planetary gear mechanism comprises gear ring; Torque control system; It is characterized in that: described torque control system is used to detect the torque value that described gear ring is subjected to, and whether the moment of torsion that judge to detect is more than or equal to the predetermined torque value of power tool, if more than or equal to the predetermined torque value of power tool,, described torque control system supplies with just stopping the power supply of motor.
2. power tool according to claim 1, it is characterized in that: described gear drive comprises at least one group of gear train, described gear train comprises planet circular system, described planet circular system comprises several rows star-wheel and the planet carrier that is used to support planetary gear, and described gear ring is connected with described planetary gear profile of tooth.
3. power tool according to claim 1 is characterized in that: described torque control system is used for detecting in real time the suffered moment of torsion of gear ring.
4. power tool according to claim 1 is characterized in that: described torque control system comprises torque detecting unit and the processing unit that is electrically connected with torque detecting unit.
5. power tool according to claim 4, it is characterized in that: described torque detecting unit comprises the sensor that is fixedly installed on the casing, be connected with gear ring and when gear ring moves and with respect to the detection piece of sensor movement, described sensor generates the signal that characterizes described gear ring movement change amount according to the movement change amount of detected detection piece, and passes to described processing unit; Described processing unit is used for the moment of torsion according to the calculated signals gear ring that receives, and at moment of torsion during more than or equal to the torque value set, output signal stops motor power and supplies with.
6. power tool according to claim 5 is characterized in that: described detection piece is done axially-movable with respect to output shaft.
7. power tool according to claim 6 is characterized in that: described power tool also comprises the sphere push rod that is fixedly installed togather with detection piece, and is set in the flexible member on the detection piece; An end face of described gear ring is provided with the inclined-plane, and described sphere push rod is pressed on the inclined-plane; When output shaft is delivered to that moment of torsion reaches certain value on the gear ring, the gear ring rotation, and by the moving sphere push rod of clinohedral and detection piece with respect to sensor movement.
8. power tool according to claim 6 is characterized in that: described sensor is a photoelectric sensor, and described detection piece is an anti-dazzling screen.
9. power tool according to claim 6 is characterized in that: described sensor is a magnetic coder, and described detection piece is a magnetic sheet.
10. power tool according to claim 5 is characterized in that: described detection piece rotates with respect to output shaft.
11. power tool according to claim 10 is characterized in that: described power tool also comprises flexible member, and described flexible member one end is fixedly installed on the flexible member on the gear ring, and the other end is fixedly installed on the casing; When output shaft is delivered to moment of torsion on the gear ring when reaching certain value, the gear ring rotation, and drive flexible member simultaneously and produce and reverse, drive detection piece and rotate with respect to sensor.
12. power tool according to claim 10 is characterized in that: described sensor is a photoelectric sensor, and described detection piece is the blanking disc of annular.
13. power tool according to claim 10 is characterized in that: described sensor is a magnetic coder, and described detection piece is the disk of annular.
14. power tool according to claim 4 is characterized in that: described torque detecting unit comprises the pressure sensor that is arranged in the casing, is evenly equipped with a plurality of projectioies on the outer circumference surface of described gear ring, and described pressure sensor is resisted against on the described projection.
15. power tool according to claim 4, it is characterized in that: described torque control system also comprises the torque setting unit that is electrically connected with processing unit, described torque setting unit is used to set numerical value, and described processing unit can convert the numerical value that the torque setting unit is set to the predetermined torque value and be stored in the processing unit.
16. power tool according to claim 4, it is characterized in that: described torque control system also comprises the torque setting unit that is electrically connected with processing unit, described torque setting unit is used to set the predetermined torque value, and described processing unit is used to store the predetermined torque value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910006650 CN101758478B (en) | 2008-12-19 | 2009-02-06 | Power tool |
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| CN200810188677 | 2008-12-19 | ||
| CN200810188677.7 | 2008-12-19 | ||
| CN 200910006650 CN101758478B (en) | 2008-12-19 | 2009-02-06 | Power tool |
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| CN101758478B CN101758478B (en) | 2013-03-06 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102620875A (en) * | 2012-04-09 | 2012-08-01 | 潍柴动力股份有限公司 | Torque measurer |
| CN102837283A (en) * | 2012-09-27 | 2012-12-26 | 北京科瑞思创测控科技有限公司 | Numerical-control constant-torque electric spanner |
| CN103286727A (en) * | 2012-03-02 | 2013-09-11 | 南京德朔实业有限公司 | Impact wrench capable of adjusting twisting force |
| CN104669186A (en) * | 2015-02-11 | 2015-06-03 | 小米科技有限责任公司 | Screwdriver control method, screwdriver control device and screwdriver |
| CN106197788A (en) * | 2016-07-01 | 2016-12-07 | 武汉千斤智能科技有限公司 | Torque sensor system, torque signals measuring method, electric assisted bicycle |
| JP2018091832A (en) * | 2016-11-30 | 2018-06-14 | 健騰精密機電股▲ふん▼有限公司 | Axial rotation type torque sensor |
| CN109510530A (en) * | 2017-09-15 | 2019-03-22 | 德丰电创科技股份有限公司 | Electrical switching unit for controlling the operation of a DC motor of an electrical apparatus |
| CN110010005A (en) * | 2019-04-18 | 2019-07-12 | 珠海格力电器股份有限公司 | Flexible folding display screen and display device |
| CN110238800A (en) * | 2018-03-09 | 2019-09-17 | 车王电子股份有限公司 | Electric tool and its torque detector |
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| CN201405312Y (en) * | 2009-02-06 | 2010-02-17 | 苏州宝时得电动工具有限公司 | Power tool |
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| JPH075927Y2 (en) * | 1991-03-29 | 1995-02-15 | リョービ株式会社 | Torque adjuster |
| JP4999236B2 (en) * | 2001-04-25 | 2012-08-15 | 勝行 戸津 | Torque control method for electric rotary tools |
| JP5201842B2 (en) * | 2007-01-29 | 2013-06-05 | 勝行 戸津 | Screwdriver torque detection device for electric screwdriver |
| CN201124405Y (en) * | 2007-10-12 | 2008-10-01 | 苏州宝时得电动工具有限公司 | Power tool |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201405312Y (en) * | 2009-02-06 | 2010-02-17 | 苏州宝时得电动工具有限公司 | Power tool |
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| CN103286727A (en) * | 2012-03-02 | 2013-09-11 | 南京德朔实业有限公司 | Impact wrench capable of adjusting twisting force |
| CN103286727B (en) * | 2012-03-02 | 2015-06-10 | 南京德朔实业有限公司 | Impact wrench capable of adjusting twisting force |
| CN102620875A (en) * | 2012-04-09 | 2012-08-01 | 潍柴动力股份有限公司 | Torque measurer |
| CN102837283A (en) * | 2012-09-27 | 2012-12-26 | 北京科瑞思创测控科技有限公司 | Numerical-control constant-torque electric spanner |
| CN102837283B (en) * | 2012-09-27 | 2015-03-25 | 北京科瑞思创测控科技有限公司 | Numerical-control constant-torque electric spanner |
| CN104669186A (en) * | 2015-02-11 | 2015-06-03 | 小米科技有限责任公司 | Screwdriver control method, screwdriver control device and screwdriver |
| CN106197788A (en) * | 2016-07-01 | 2016-12-07 | 武汉千斤智能科技有限公司 | Torque sensor system, torque signals measuring method, electric assisted bicycle |
| JP2018091832A (en) * | 2016-11-30 | 2018-06-14 | 健騰精密機電股▲ふん▼有限公司 | Axial rotation type torque sensor |
| CN109510530A (en) * | 2017-09-15 | 2019-03-22 | 德丰电创科技股份有限公司 | Electrical switching unit for controlling the operation of a DC motor of an electrical apparatus |
| CN109510530B (en) * | 2017-09-15 | 2021-03-02 | 德丰电创科技股份有限公司 | Electrical switching unit for controlling the operation of a DC motor of an electrical apparatus |
| CN110238800A (en) * | 2018-03-09 | 2019-09-17 | 车王电子股份有限公司 | Electric tool and its torque detector |
| CN110238800B (en) * | 2018-03-09 | 2022-04-05 | 车王电子股份有限公司 | Electric tool and torsion detecting device thereof |
| CN110010005A (en) * | 2019-04-18 | 2019-07-12 | 珠海格力电器股份有限公司 | Flexible folding display screen and display device |
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| CN101758478B (en) | 2013-03-06 |
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