CN206490537U - Magnetic shaft coupling electric screw driver load testing device - Google Patents

Abstract

The utility model discloses a kind of magnetic shaft coupling electric screw driver load testing device, including screwdriver bit（1）, overcoat（6）, motor（13）And the controller of control circuit（7）, the screwdriver bit（1）It is connected with the driving shaft for rotating it（41）, the driving shaft（41）Pass through outer rotor set（8）It is connected with outer rotor（81）；The motor（13）Pass through motor shaft（12）It is connected with and outer rotor（81）The internal rotor of magnetic couplings（91）, the outer rotor set（8）Periphery be provided with one group of detection outer rotor（81）The detector module of rotation, the motor shaft（12）It is connected with detection bar（121）, in detection bar（121）Detection bar can be tested by being provided with one group（121）The detector module of rotating speed.The utility model produces two groups of waveforms by being provided with detector module, and respective rotating speed, load are drawn according to waveform, is used as the feedback of speed control and Power Control.

Description

Magnetic shaft coupling electric screw driver load testing device

Technical field

The utility model is related to field of power tools, more particularly to a kind of magnetic shaft coupling electric screw driver load testing device.

Background technology

With the development and the appearance of novel magnetic materials of magnetic material, the moment of torsion of Magnetic Force Transmission Coupling transmission will more Come bigger, volume will be more and more small, its application will be more and more wide, in addition to pump and reactor, valve, hydraulic cylinder and Cylinder and some other occasion that need to solve dynamic sealing leakage problem can all be applied.It is contemplated that Magnetic Force Transmission Coupling will Have a boundless market prospects.

Magnetic Force Transmission Coupling belongs to non-contact type coupling, and it is typically made up of inside and outside 2 magnets, and inner magnet is with being transmitted Part is connected, and outer magnet is connected with force piece.Magnetic Force Transmission Coupling except flexible shaft coupling buffer absorbing function in addition to, its Maximum the characteristics of, is that it breaks traditions the structure type of shaft coupling, using brand-new magnetic coupling principle, realize driving shaft with from The transmission of power and torque just can not be carried out by directly contacting between moving axis, and dynamic sealing can be turned to static seal, realize that zero lets out Leakage.Therefore it is widely used in the occasion for having particular/special requirement to leakage.

Electric screw driver is equipped with adjusting and limits the mechanism of moment of torsion, the electric tool for tightening and unscrewing screw, It is mainly used in assembly line, is one of indispensable instrument of most of manufacturing enterprise.

In general, the structure of electric screw driver is by motor, gear reduction unit, clutch apparatus, driver bit and guarantor Sheath, rotating power switch and power supply coupling arrangement part etc. are constituted.Wherein, motor passes through gear reduction unit and driver bit In connection, i.e., current electric screw driver, motor is hardwired with driver bit, and Hard link can be rushed directly when overloading stall Motor is hit, motor is easily damaged.

Therefore, it is necessary to design electric screw driver that is a kind of contactless and quickly being protected with overload.

Utility model content

The utility model is a kind of magnetic shaft coupling electric screw driver load testing device of offer that solves the above problems, and is connect using non- Touch shaft coupling carries out the transmission of power and torque, two groups of waveforms are produced by two groups of detection components, is drawn respectively according to waveform From rotating speed, load, be used as the feedback of speed control and Power Control；Simultaneously according to the contrast of two groups of waveforms come Judge whether overload so that controller in the event of overloading, can be quickly detected and then close motor, be that electric screw driver is carried Quick overload protection is supplied；And can determine whether out it is screwdriver bit overload or motor rotation blockage, it is easy to user according to specific event Barrier is timely and effectively improved.

To achieve the above object, the effect above is reached, the utility model is achieved through the following technical solutions：

A kind of magnetic shaft coupling electric screw driver load testing device, including screwdriver bit, driving shaft, overcoat, output shaft, motor, subtract Fast device and controller, screwdriver bit are connected with driving shaft, and output shaft and decelerator connection, decelerator and motor connection, driving shaft lead to Cross outer rotor set and be connected with outer rotor, the motor shaft that output shaft is connected with internal rotor, motor by internal rotor magnetic force axle passes through Decelerator, driving output shaft is rotated, so that internal rotor is rotated, in the presence of magnetic couplings, outer rotor and internal rotor Rotate together, drive screwdriver bit to rotate by driving shaft, so as to complete tightening or unscrewing to screw；The periphery covered in outer rotor is set The detector module that one group of detection outer rotor is rotated is equipped with, motor shaft is connected with detection bar, and detection bar, which is provided with one group, to be surveyed The detector module of detection bar rotating speed is tried, detector module rotates with internal rotor, outer rotor and produces pulse, and controller is according to two Dutycycle, signal frequency, the stability of signal waveform of waveform produced by pulse can draw load and rotating speed, for making For speed control, the feedback of Power Control and judge whether overload.

As a kind of preferred embodiment of detector module, detector module includes Hall sensor and at least one magnet, Magnet is placed on the periphery of outer rotor set and on detector, Hall sensor is placed on the opposite side of magnet, and wherein magnet is gone to , will be because of by changes of magnetic field during the position that Hall sensor is placed, and cutting magnetic line, Hall sensor will export arteries and veins Rush signal.

As a kind of preferred embodiment of detector module, it is infrared anti-with least one that detector module includes infrared sensor Region is penetrated, infrared sensor includes infrared transmitter and infrared remote receiver, and infrared external reflection region is placed on the periphery of outer rotor set With on detector, infrared sensor is placed on the opposite side in infrared external reflection region, infrared transmitter sends infrared signal, is running into Behind infrared external reflection region, reflection infrared signal to infrared remote receiver is received, so as to produce pulse.

As a kind of preferred embodiment of detector module set location, outer rotor, which is put, is connected with coupler sleeve, detector Sensor in component is separately positioned on coupler sleeve with controller, and coupler sleeve and controller do not rotate, from And make internal rotor and outer rotor after certain position is turned to, the sensor on coupler sleeve and controller, in triggering device In the presence of, so as to produce waveform.

As the further optimization of magnet, more than two magnet are provided with the detector, are set on the detector In length not symmetrically, the waveform so occurred when motor is rotated and reverse difference can be examined magnet with this The rotating of measured motor.

Changed for the ease of user and screwdriver bit attaching/detaching apparatus is connected with screwdriver bit, the screwdriver bit, screwdriver bit attaching/detaching apparatus includes screwdriver bit Adapter sleeve, it is arranged on screwdriver bit adapter sleeve and is used for withstanding screwdriver bit when the screwdriver bit positioning ball of screwdriver bit, screwdriver bit are fixed for fixing The screwdriver bit positioning sleeve of positioning ball, the screwdriver bit spring being connected with screwdriver bit positioning sleeve；It is provided with and is positioned with screwdriver bit on screwdriver bit positioning sleeve The corresponding opening of steel ball, when changing, user's down force is on screwdriver bit positioning sleeve, and screwdriver bit spring starts to be compressed to opening At correspondence screwdriver bit positioning ball, now user takes out screwdriver bit, and extruding screwdriver bit positioning ball is exposed in opening, the suitable screwdriver bit of insertion To suitable position, screwdriver bit positioning sleeve is unclamped, screwdriver bit spring starts resilience so that opening misplaces with screwdriver bit positioning ball, now The sidewall extrusion screwdriver bit positioning ball of screwdriver bit positioning sleeve, so that fixed screwdriver bit.

As a kind of preferred embodiment of the present utility model, magnetic shaft coupling electric screw driver load testing device is adjusted including moment of torsion Nut, moment of torsion adjusting nut adjusts moment of torsion by adjusting spacing distance or coupling area between outer rotor and internal rotor, outside Spacing distance between rotor and internal rotor is more remote or coupling area is fewer, then the moment of torsion dynamics produced is smaller, otherwise bigger.

As a kind of preferred embodiment of magnet coupler, in the inner circumferential portion point of the outer circumference of internal rotor, outer rotor Not Zhuan You magnet, internal rotor aligns with the magnet working face on outer rotor, and magnet is even number pole, and justified according to NS interleaved modes Week arrangement, using coaxial type magnet coupler, can provide larger moment of torsion dynamics in certain size.

The beneficial effects of the utility model are：

A kind of magnetic shaft coupling electric screw driver load testing device, by the magnetic couplings of outer rotor and internal rotor, reaches The technique effect that power is transmitted with torque is carried out using non-contact type coupling；By being provided with two groups of detector modules, so that Produce two groups of waveforms, the rotating speed of motor and outer rotor respectively obtained and with size is carried according to waveform, be used as speed control with And the feedback of Power Control；Judge whether overload according to the contrast situation of two groups of waveforms simultaneously so that controller is in electronic spiral shell In the case of silk knife overload, it can be quickly detected and then close motor, as electric screw driver provides quick overload protection； And can determine whether out it is screwdriver bit overload or motor rotation blockage, it is easy to user timely and effectively to be changed according to specific failure It is kind；Meanwhile, pass through screwdriver bit attaching/detaching apparatus so that user can change suitable screwdriver bit at any time, be adjusted by moment of torsion adjusting nut Torsion is locked, so as to adapt to tightening or unscrewing for various different screws.

Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model Art means, and being practiced according to the content of specification, with preferred embodiment of the present utility model and coordinate accompanying drawing detailed below Describe in detail it is bright as after, embodiment of the present utility model is shown in detail by following examples and its accompanying drawing.

Brief description of the drawings

Accompanying drawing described herein is used for providing further understanding to of the present utility model, constitutes the part of the application, Schematic description and description of the present utility model is used to explain the utility model, does not constitute to of the present utility model improper Limit.In the accompanying drawings：

Fig. 1 is the schematic diagram for the magnetic shaft coupling electric screw driver load testing device that the utility model is related to；

Fig. 2 is Fig. 1 profile；

Fig. 3 disassembles schematic diagram for Fig. 1 part；

Fig. 4 disassembles schematic diagram for Fig. 1 another part；

Fig. 5 is the enlarged diagram of a-quadrant in Fig. 2；

Fig. 6 is the enlarged diagram in B regions in Fig. 4.

Wherein, above-mentioned accompanying drawing is marked including drawings described below：Screwdriver bit 1, screwdriver bit attaching/detaching apparatus 2, screwdriver bit positioning sleeve 21, screwdriver bit connect Female connector 22, screwdriver bit positioning ball 23, screwdriver bit spring 24, moment of torsion adjusting nut 3, shaft coupling cover for seat 4, driving shaft 41, coupler sleeve 5th, Hall sensor 51, overcoat 6, controller 7, outer rotor set 8, outer rotor 81, magnet 82, internal rotor magnetic force axle 9, internal rotor 91st, output shaft 10, decelerator 11, decelerator set 111, decelerator end cap 112, motor shaft 12, detection bar 121, detector 122, Motor 13.

Embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, the utility model is described in detail：

As shown in figure 1, a kind of magnetic shaft coupling electric screw driver load testing device, including screwdriver bit 1, screwdriver bit attaching/detaching apparatus 2, torsion Square adjusting nut 3, shaft coupling cover for seat 4, coupler sleeve 5, overcoat 6, controller 7, wherein screwdriver bit 1 are connected with screwdriver bit attaching/detaching apparatus 2, Moment of torsion adjusting nut 3 is arranged on outside shaft coupling cover for seat 4, and controller 7 is arranged on afterbody, among the present embodiment, is turned round by rotating Square adjusting nut 3, changes the coupling area between outer rotor 81 and internal rotor 91, so as to adjust to suitable moment of torsion, to adapt to Demand of the different screws to different locking torsion.

As shown in Fig. 2 being Fig. 1 profile, coupler sleeve 5 is provided with outer rotor set 8, included under overcoat 6 defeated Shaft 10, decelerator 11, motor shaft 12, motor 13, wherein output shaft 10 are connected with decelerator 11, and motor 13 passes through motor shaft 12 It is connected, after motor 13 starts, is reached by decelerator 11 after suitable speed with decelerator 11, driving output shaft 10 is rotated, electricity Arbor 12 is connected with detector 122 by detection bar 121.

As shown in figure 3, being Fig. 1 optical cable, wherein screwdriver bit attaching/detaching apparatus 2 includes screwdriver bit positioning sleeve 21, screwdriver bit company Female connector 22, screwdriver bit positioning ball 23, screwdriver bit spring 24, screwdriver bit 1 are connected with screwdriver bit adapter sleeve 22, and screwdriver bit positioning ball 23 is arranged on On screwdriver bit adapter sleeve 22, screwdriver bit positioning sleeve 21 is enclosed on the outside of screwdriver bit adapter sleeve 22, and has withstood screwdriver bit positioning steel when fixed The opening corresponding with screwdriver bit positioning ball 23, screwdriver bit spring 24 and screwdriver bit positioning sleeve are provided with pearl 23, screwdriver bit positioning sleeve 21 21 connections, user is when changing different screwdriver bits 1, and down force is on screwdriver bit positioning sleeve 21, and screwdriver bit spring 24 starts to be compressed to At opening correspondence screwdriver bit positioning ball 23, now user takes out screwdriver bit 1, and extruding screwdriver bit positioning ball 23 is exposed in opening, inserted Suitable screwdriver bit unclamps screwdriver bit positioning sleeve 21 to suitable position, and screwdriver bit spring 24 starts resilience so that opening is positioned with screwdriver bit Steel ball 23 misplaces, now the sidewall extrusion screwdriver bit positioning ball 23 of screwdriver bit positioning sleeve 21, so that fixed screwdriver bit 1.

In figure 3, driving shaft 41 is connected with screwdriver bit attaching/detaching apparatus 2, screwdriver bit 1 simultaneously；Decelerator 11 includes decelerator set 111 With decelerator end cap 112.

As shown in figure 4, Fig. 1 another part disassembles schematic diagram, the inside of wherein outer rotor set 8 is equipped with outer rotor 81, The inner circumferential portion of outer rotor 81 is equipped with the internal rotor 91 being set with magnet, output shaft 10 with the magnetic couplings of outer rotor 81, The outer circumference of internal rotor 91 is equipped with magnet, and internal rotor 91 aligns with the magnet working face on outer rotor 81, and magnet is Even number pole, and according to NS interleaved mode circumferential arrangements, i.e., using coaxial type magnet coupler, although plane synchronization magnet coupler It is simple in construction, it is less demanding to the axiality of two axles during installation, it is cheap, but due to the torque and disc face of transmission Product is relevant, therefore, and it is too big that the moment of torsion of plane synchronization magnet coupler can not be done, and otherwise can cause oversized, installation difficulty, So in the present embodiment, in order to ensure to provide larger moment of torsion dynamics in certain size, using coaxial type magnet coupler.

The enlarged diagram of a-quadrant is as shown in figure 5, the enlarged diagram in B regions is as shown in fig. 6, knot in Fig. 4 in fig. 2 Close Fig. 2,4,5,6 to understand, Hall sensor 51 is provided with coupler sleeve 5 and controller 7,8 periphery is covered in outer rotor A circle side is respectively arranged with, multiple magnet 82 is placed with circle side, detector 122 is provided with multiple magnet 82, such as Fig. 5 institutes Show, now the magnet 82 on outer rotor set 8 and the one group of detector group of formation of Hall sensor 51 on the coupler sleeve 5 of opposite side Equal magnet 82 forms another group of detector group with the Hall sensor 51 on the controller 7 of opposite side on part, detector 122 Part,, will be because of by changes of magnetic field when magnet 82 goes to the position of the placement of Hall sensor 51, and cutting magnetic line, suddenly Your sensor 51 will output pulse signal.

Meanwhile, do not marked in above-mentioned accompanying drawing 1-6, shell is additionally provided with the outside of overcoat 6, and show on shell torsion The graduation apparatus and button of square strength of adjustment, its graduation apparatus, button and controller 7 are connected.

In summary, the present embodiment when in use, according to the screw to be operated, by moment of torsion adjusting nut 3, regulation to Suitable moment of torsion dynamics, by screwdriver bit attaching/detaching apparatus 2, changes suitable screwdriver bit 1, presses switch key, starts motor 13 and rotates, Drive internal rotor 9 to rotate by decelerator 11, output shaft 10, internal rotor magnetic force axle 9, in the presence of magnetic couplings, drive outer Rotor 81 is rotated, and drives screwdriver bit 1 to rotate by driving shaft 41, completes screwing or unclamp to screw.

When internal rotor 91 and outer rotor 81 are rotated, because the driving shaft 41 that outer rotor 81 is connected needs certain torsional forces Degree so that carry out synchronous axial system between internal rotor 91 and outer rotor 81 to deviate initial position, internal rotor 91 is driven by motor 13, with The proportional relation of rotating speed of motor shaft 12, can obtain the waveform of internal rotor 91 indirectly, in rotation by the waveform on measured motor axle 12 During turning, the Hall sensor 51 of outer rotor set 8 and controller 7 can produce pulse signal when turning to magnet 82, i.e., Variable signal can be produced according to the relative position of Hall sensor 51 and magnet 82, signal waveform is divided using controller 7 Analysis, rotating speed can be calculated by signal frequency, and two signal waveforms are after certain processing, according to there is the time of dutycycle Difference reflects the deviation distance between internal rotor 91 and outer rotor 81, i.e., the band of magnet coupler is calculated according to dutycycle and phase difference Load situation.

The feedback of speed control and Power Control can be used as with load situation and rotary speed information；When after treatment Two groups of signal waveforms be compared, be normal work when waveform is similar, when waveform produces acute variation, two waveforms occur bright In the significant difference different time, illustrate that screwdriver bit 1 overloads, cause screwdriver bit 1, outer rotor 81 to stop operating, now the hall sensing of outer rotor set 8 Device 51 is in fixed position with magnet 82, and perseverance output pulse or perseverance do not export pulse, and now under the drive of motor 13, it is interior Rotor 91 is still ceaselessly rotated, the magnetic field in air gap between outer rotor 81 changes rapidly, internal rotor 91, outer rotor 81 Magnet fills demagnetization by other side simultaneously, produces heat, temperature can rapidly rise to more than 100 degrees Celsius in the short time, so as to lead Magnet demagnetization is caused, magnet coupler is scrapped, set multiple magnet 82 to coordinate with Hall sensor 51, within the extremely short time, control Device 7 processed can be quickly detected and then close motor 13, it is to avoid the phenomenon of magnet demagnetization occur, so as to serve overload protection.

In the state of two groups of signal waveforms after treatment are in a stabilization, that is, illustrate outer rotor 81, internal rotor 91 are in the state that stops operating, now, and Hall sensor 51 is in fixed position, perseverance output pulse or perseverance with magnet 82 Do not export pulse so that two groups of signal waveform is in stable state, now, the controlled device 7 of motor 13 control according to Right output torque, and the rotating speed of motor 13 is 0, i.e., stall occurs for motor 13, and controller 7 is quickly detected and then closes motor 13, so as to play rotation-clogging protection, this can not learn that user is according to two for the single group waveform produced by single group detector module Group waveform is contrasted and analyzed, and is that screwdriver bit 1 overloads or the stall of motor 13 so as to effective distinguish, is easy to user according to tool Body failure is timely and effectively improved.

Second embodiment of the present utility model, is to reflect by the equivalence replacement of magnet 82 on the basis of preferred embodiment Infrared infrared external reflection region, is to include the infrared biography of infrared transmitter and infrared remote receiver by the equivalence replacement of Hall sensor 51 Sensor, i.e., in outer rotor set 8 with being provided with one group of infrared detection device assembly on detector 122, infrared transmitter sends infrared Signal, after infrared external reflection region is run into, reflection infrared signal to infrared remote receiver is received, so as to produce pulse.

3rd embodiment of the present utility model, on the basis of preferred embodiment, changes magnet 82

Set, the magnet 82 on detector 122 is not symmetrical in length, and for convenience of description, the present embodiment exists Two magnet 82 are provided with detector 122, successively referred to as the first magnet, the second magnet, wherein the first magnet, the second magnet The magnet 82 successively decreased successively for diameter, i.e. the first magnet, the second magnet successively decrease successively in length, when rotating forward, through two During the magnet 82 successively decreased successively, produced dutycycle is also successively decreased successively, and in reversion, through two magnet incremented by successively When 82, produced dutycycle is incremented by successively, produced signal waveform during so as to according to 13 forward or reverse of motor Difference, for detecting the rotating of motor 13, is of coursed, in the 3rd embodiment of the above, as long as the magnet on detector 122 82 is symmetrical so that produced signal waveform is different during the rotating of motor 13, is the equivalence enforcement of the present embodiment Example.

Fourth embodiment of the present utility model, on the basis of second embodiment, changes infrared external reflection region, makes it in inspection The infrared external reflection region surveyed on device 122 is not symmetrical so that produced signal waveform is different during the rotating of motor 13, according to The secondary rotating to measure motor 13.

Of course, two groups of detector modules that testing of electric motors axle 12 is rotated with outer rotor 81 can also be to differ, that is, survey Examination motor shaft 12 uses infrared detection, and test outer rotor 81 uses Hall sense using hall sensing either testing of electric motors axle 12 Should, test outer rotor 81 using infrared detection institute, so formed the 5th, sixth embodiment belong to preferred embodiment or the The equivalent integers of two embodiments, the 3rd, fourth embodiment is combined with the 5th, sixth embodiment to detect the positive and negative of motor 13 Turn, the seven, the eight embodiments so formed belong to the equivalent integers of 3rd embodiment or fourth embodiment.

Described above, preferred embodiment only of the present utility model not makees any formal to the utility model Limitation；The those of ordinary skill of all industry can be shown in by specification accompanying drawing and described above and swimmingly implement this practicality It is new；But, all those skilled in the art are not being departed from the range of technical solutions of the utility model, are taken off more than The technology contents shown and the equivalent variations of a little variation, modification and evolution made, are equivalent embodiment of the present utility model； Meanwhile, the change of all any equivalent variations made according to substantial technological of the present utility model to above example, modify and drill Become etc., still fall within the protection domain of the technical solution of the utility model.

Claims (8)

1. a kind of magnetic shaft coupling electric screw driver load testing device, including screwdriver bit（1）, overcoat（6）, motor（13）And control The controller of circuit（7）, it is characterised in that：The screwdriver bit（1）It is connected with the driving shaft for rotating it（41）, the driving shaft （41）Pass through outer rotor set（8）It is connected with outer rotor（81）；The motor（13）Pass through motor shaft（12）It is connected with and outer rotor （81）The internal rotor of magnetic couplings（91）, the outer rotor set（8）Periphery be provided with one group of detection outer rotor（81）Rotate Detector module, the motor shaft（12）It is connected with detection bar（121）, in detection bar（121）Detection can be tested by being provided with one group Bar（121）The detector module of rotating speed.

2. magnetic shaft coupling electric screw driver load testing device according to claim 1, it is characterised in that：The detector group Part includes Hall sensor（51）With at least one magnet（82）, the detection bar（121）On be connected with detector（122）, institute State magnet（82）It is placed on outer rotor set（8）Periphery and detector（122）On, the Hall sensor（51）It is placed on magnet （82）Opposite side.

3. magnetic shaft coupling electric screw driver load testing device according to claim 1, it is characterised in that：The detector group Part includes infrared sensor and at least one infrared external reflection region, and the infrared sensor includes infrared transmitter and infrared receiver Device, the detection bar（121）On be connected with detector（122）, the infrared external reflection region is placed on outer rotor set（8）Periphery With detector（122）On, the infrared sensor is placed on the opposite side in infrared external reflection region.

4. magnetic shaft coupling electric screw driver load testing device according to claim 1, it is characterised in that：The outer rotor set （8）On be connected with coupler sleeve（5）, the sensor in the detector module is placed on coupler sleeve（5）Upper and controller（7） On.

5. magnetic shaft coupling electric screw driver load testing device according to claim 2, it is characterised in that：In the detector （122）It is provided with more than two magnet（82）, it is arranged on detector（122）On magnet（82）It is mutually not right in length Claim.

6. according to any described magnetic shaft coupling electric screw driver load testing device of claim 1 to 5, it is characterised in that：It is described Screwdriver bit（1）On be connected with screwdriver bit attaching/detaching apparatus（2）, the screwdriver bit attaching/detaching apparatus（2）Including screwdriver bit adapter sleeve（22）, be arranged on batch Head adapter sleeve（22）Above and for fixing screwdriver bit（1）Screwdriver bit positioning ball（23）, screwdriver bit（1）Determine when fixed for withstanding screwdriver bit Position steel ball（23）Screwdriver bit positioning sleeve（21）And screwdriver bit positioning sleeve（21）The screwdriver bit spring of connection（24）；The screwdriver bit positioning sleeve （21）On be provided with and screwdriver bit positioning ball（23）Corresponding opening.

7. according to any described magnetic shaft coupling electric screw driver load testing device of claim 1 to 5, it is characterised in that：It is described Magnetic shaft coupling electric screw driver load testing device includes moment of torsion adjusting nut（3）, the moment of torsion adjusting nut（3）It is outer by regulation Rotor（81）With internal rotor（91）Between spacing distance or coupling area adjust moment of torsion.

8. according to any described magnetic shaft coupling electric screw driver load testing device of claim 1 to 5, it is characterised in that：Institute State internal rotor（91）Outer circumference, outer rotor（81）Inner circumferential portion be respectively provided with magnet, the internal rotor（91）With Outer rotor（81）On magnet working face align, the magnet is even number pole, and according to NS interleaved mode circumferential arrangements.