Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of rational in infrastructure for above-mentioned deficiency, can assist with cable unwrapping wire, and the line style of emitting cable is more straight, and a people just can operate, time saving and energy saving, and the hard cable paying-off device that can count emitting the length of cable.
For solving the problems of the technologies described above, the constructional feature of this hard cable paying-off device is: comprise base, on base, by center shaft, be rotatablely equipped with rotating disk, on center shaft, slip cap is equipped with handle, between handle and center shaft, be provided with latching device, handle is driven up and down and be connected with at least two strut members that can move between rotating disk middle part and limit portion by connecting rod mechanism, the rectification wheel that is disposed on cable output trajectory both sides is also installed on base, on base, be provided with and correct the stroke sensor that coordinates of wheel, the treater being electrically connected to stroke sensor is also installed on base, treater mouth is electrically connected with telltale.
This hard cable paying-off device be by the vertical swivel feeding structure of adjustable inner support and both sides roller, correct that structure realizes can assist with cable unwrapping wire, the line style of emitting cable is more straight, one people just can operate, time saving and energy saving, and can to emitting, the length of cable counts.
The vertical swivel feeding of adjustable inner support is in principle, mainly refer to that hard cable drum is to be supported and fixed by inner support mode, its support degree is adjustable, namely can support the drum of different inner diameters, and wire coil shaft carries out cable feeding to vertical setting and by rotation mode, unwrapping wire namely.Structurally mainly comprise by vertical center shaft and be rotatably installed in the rotating disk on base, like this, rotating disk just can, under the support of center shaft, freely rotate around center shaft above base.On center shaft, slip cap is equipped with handle, and handle can slide along center shaft easy on and off.Between handle and center shaft, be provided with latching device, by operation latching device, handle can be positioned to the optional position of passed through center shaft.On rotating disk, be provided with at least two strut members, strut member can slide between rotating disk middle part and limit portion.Rotating disk and handle link together by connecting rod mechanism, like this, and when handle slides up and down along center shaft, handle will promote strut member by connecting rod mechanism and move to rotating disk limit portion from rotating disk middle part, referred to as outer, otherwise, pull strut member to be moved to middle part by rotating disk limit portion, referred to as inside contracting.Therefore, by adjusting the height of handle on center shaft, just can control or adjust the position that strut member makes progress in rotating disk footpath, namely control the degree that strut member is opened or inside contracted outward.The quantity of strut member is set at least two, and when moving handle, handle will drive each strut member synchronization action, can guarantee like this to open or inside contract the consistent of the amount of feeding outward.
In use, first hard cable wire rim central axle sleeve is installed to all strut members outside, then by release lever and center shaft, and along the downward driving handle of center shaft.Now, can to promote strut member by connecting rod mechanism close to drum inwall for handle.When strut member withstands on drum inwall and while compressing, handle is locked on center shaft by latching device, now, drum is fixed on rotating disk or center shaft because the support type of strut member clamps.Because the action of each strut member under handle drives is consistent, therefore can guarantee that drum is coaxial with center shaft after clamped.Even if the movement of each strut member is not in full accord, after opening outside stressed, can guarantee the support type of drum to be fixedly clamped.Now drum and center shaft disalignment, but do not affect cable unwrapping wire.While needing unwrapping wire, by the outside tractive of cable head in drum outside, can rotate by drum drive wire coiling center shaft, drum will drive the outside feeding of cable in outside in stressed rotation like this, namely outside unwrapping wire.
Unwrapping wire is complete, removes handle locking, and upwards pulls handle along center shaft, and now each strut member moves to center shaft under handle drives, and also starts to inside contract.When strut member is during away from drum inwall, handle is locked on center shaft by latching device, now can easily residue drum be taken off from rotating disk.While using, directly install to drum all strut members outside and repeat said process along central axle sleeve next time, operates very simple.Because this hard cable paying-off device has adopted and can open the structure that is fixedly clamped that can inside contract outward drum, therefore can be fixedly clamped and unwrapping wire to the drum of various internal diameters, commonality is better.
Both sides roller is corrected structure and is referred to that from the cable both sides of drum output, being provided with roller corrects structure, in output cable, cable is carried out to roller extruding, thereby realize, correct output line cable type, make to export cable and keep linear pattern or approach linear effect.Structurally, mainly comprise the rectification wheel being arranged on base, correct the both sides that wheel lays respectively at cable output trajectory, the rectification wheel of every side is responsible for the cable of this side partly to push rectification.When cable from both sides, correct between wheel through time, if there is crooked or distortion in cable, the rectification wheel of respective side will push to correct its shape to this part cable, is equivalent to have the hand that a pair of slides constantly smoothing out with the fingers straight line cable, contributes to the more straight line style of cable output.
Stroke sensor is also installed on base, the Main Function of stroke sensor be to correct take turns into rotation mileage monitor, namely the length of output cable is detected, and sends mileage number to treater and process.Treater mouth is electrically connected with telltale, and treater shows mileage number by telltale, namely emits the length of cable, very directly perceived.This hard cable paying-off device in use, only need be by cable from conical tube, correct wheel and pull out, operate very simply, a people can operate, and has greatly improved work efficiency.
As a kind of implementation, described latching device comprises the chute that is axially disposed within center shaft outer wall, chute is communicated with the inner chamber of center shaft, on the internal chamber wall of chute both sides, be evenly equipped with positioning teeth, the button extending in inner chamber is installed on handle, button the inner is provided with the positioning pawl coordinating with positioning teeth, and the spring that positioning pawl is compressed to positioning teeth is installed on handle.
Because chute extends axially along center shaft, therefore can guarantee that handle is along the axially movable while of center shaft, the button extending on handle in chute also can move axially along center shaft simultaneously.Positioning teeth on the internal chamber wall of chute both sides and the positioning pawl of button the inner are the critical components of this latching device, and both are pressed together under the effect of spring force, are namely relatively fixed together.After positioning pawl and positioning teeth are fixing, the button being connected with positioning pawl has also just been fixed on handle on center shaft, has also just realized the locking positioning effect to handle and center shaft.While needing release, only need press button to central axis direction, button can overcome spring force and drive positioning pawl away from positioning teeth, and now positioning pawl and positioning teeth, without any the interaction of power, in free state, are also latch-release, operate very simple.
As a kind of implementation, described connecting rod mechanism comprises the driving lever that upper end and the hinged lower end of handle and strut member are hinged, driving lever upper end near center shaft, lower end away from inclined setting.
Because driving lever two ends and handle and strut member are all hinged relationship, therefore not only can make handle, by driving lever, power be passed to strut member, can also realize the vertical upper and lower power of handle to the transformation that drives strut member in the horizontal direction power of rotating disk middle part and limit portion parallel motion by hinged matching relationship, be also the break-in of power.Driving lever is done to above-mentioned being obliquely installed, can guarantee that handle can only drive strut member peripheral mobile at the upper link point of driving lever, avoided because driving lever is when vertical, while also going up lower link point vertical alignment, because cannot driving strut member, moves the component that do not tilt, also enter and drive dead angle, also effectively avoided that driving lever upper end is outward-dipping, lower end inwardly (center shaft) tilt, and cause driving strut member to inside contract, can not drive the outer drawback of opening of strut member, that is to say the drawback of the drum that can not be fixedly clamped.
As improvement, rotating disk is provided with the slideway corresponding with strut member parallel motion track, is provided with and can only slides and the slide bar affixed with strut member bottom along slideway in slideway.
Because slide bar can only endwisely slip along slideway, and slideway is because strut member motion track is originally corresponding, therefore slide bar and strut member affixed after, not only can provide firm support for strut member, also just guaranteed the stable support of strut member to drum, and can make strut member outside fixing direction, open or inside contract, and be also difficult for deflection, guaranteed the reliability of service of whole hard cable paying-off device.
As improvement, correct base between wheel and rotating disk and be provided with difference and the different cable of outbound course is adjusted to the device for regulating direction consistent with correcting the corresponding cable track of wheel automatically highly on drum.
Drum is all generally circular, all has thickness, and after being installed on rotating disk, drum has just had certain altitude, and direction or angle when this just causes cable on each height outwards to be exported are different.Because there is the rectification wheel that cable line style is adjusted in this hard cable paying-off device, therefore for the cable that makes to correct after wheel is corrected has more straight line style, on the cable track between rotating disk and rectification wheel, the device that cable track is carried out to tuning must be set.The Main Function of device for regulating direction, exactly by the cable of exporting on differing heights drum position, also be that the different cable of input direction carries out tuning, make it can, with identical or approach identical input direction or angle and be input to and correct between wheel, contribute to the more linear cable of output in when output.Clearly, when the direction of device for regulating direction output cable with correct take turns between the direction of cable in the same way time, auxiliaring effect is best.
As a kind of implementation, described device for regulating direction comprises the horn-like conical tube that entrance is less compared with large outlet, and conical tube inwall middle part uniform ring is provided with cable rolls and coordinate tuning roller.
Because conical tube is entrance compared with less horn-like of large outlet, so conical tube inwall is to inside contract gradually and rounding off.Cable on drum is when conical tube penetrates between rectification wheel, even the outbound course of differing heights cable or angle are different on drum, guiding or adjustment through conical tube rounding off inwall, capital becomes same direction or angle is exported from conical tube outlet, also consistent with the cable course bearing of correcting between wheel.Like this, even coil diameter, highly different, after conical tube tuning, can guarantee that each drum cable is with between same direction or angle input rectification wheel, not only commonality is stronger, also play the preliminary shaping to cable, made to correct wheel more light and smooth and easy to the secondary rectification of cable, contributed to finally to export the cable that line style is more straight.Because conical tube is the horn-like of rounding off, so conical tube inwall middle part (vertically) is maximum to the application of force of cable tuning, also maximum to the friction force of cable herein, is unfavorable for the integraty of cable top layer insulation.In this hard cable paying-off device, conical tube inwall middle part is provided with tuning roller, and the quantity of tuning roller is a plurality of, arrange, and the rotation direction of tuning roller matches with cable moving direction along conical tube inwall middle part annular.Like this, cable is through conical tube when middle part, and tuning roller will contact with cable by roll mode and carry out tuning, the friction force to cable while greatly having reduced tuning, and not only cable moves more smooth and easyly, has also guaranteed the integraty of cable insulating layer.
As improvement, on the inwall of conical tube entrance and exit, also uniform ring is provided with cable and rolls and to coordinate tuning roller.
On conical tube entrance and exit inwall, arrange after tuning roller, can greatly reduce the friction force of conical tube entrance and exit to cable, principle of work and act on similar to the abovely, no longer carefully states at this.
As further improvement, in the middle of described tuning roller, thinner two ends are thicker, and each adjacent tuning roller head and the tail are circular ring to being connected into inner ring.
Tuning roller is arranged to obtain to the thick and rounding off in thinner two ends, middle part, namely the axial profile line of tuning roller is arranged to the protruding camber line in middle concave two ends or segmental arc.Because adjacent tuning roller is all to dock successively and encircle to be located on conical tube inwall, therefore, each tuning roller inner shafts can be connected into a circle to outline line, that is to say that each segmental arc can connect into a ring body, and this ring body is circular.Like this, for the ring body inner ring of each tuning roller formation, be just equivalent to the collars of a seamless connection.Therefore, no matter from which direction or angle, enter the cable of conical tube, have one or two corresponding tuning roller normal-running fit with it, guaranteed smoothness that cable moves and the integraty on insulation top layer.
As a kind of implementation, described stroke sensor comprises the Hall element being arranged on base and is installed in corrects the magnetic patch corresponding with Hall element in wheel rotating shaft.
While correcting wheel rotation, often circle and can trigger once to Hall element with the magnetic patch of correcting wheel coaxial rotation, treater just can record the number of turns of correcting wheel by Hall element like this, then be multiplied by and correct the stroke that the girth of taking turns just can calculate the rotation of rectification wheel, the length that namely cable is emitted.Hall element is a kind of conventional sensor, and its structure and principle of work belong to known technology, at this, no longer carefully state.
As improvement, the cable left and right sides is provided with corrects wheel, and the upper and lower both sides of cable are also provided with corrects wheel.
The rectification wheel of the cable left and right sides can be corrected cable in the crooked or distortion on left and right directions, the rectification wheel of the upper and lower both sides of cable can be corrected the crooked or distortion on cable above-below direction, can guarantee that like this cable can export more straight line style.
In sum, adopt the hard cable paying-off device of this structure, rational in infrastructure, can assist with cable unwrapping wire, the line style of emitting cable is more straight, and a people just can operate, time saving and energy saving, and can count emitting the length of cable, while being particularly suitable for hard cable unwrapping wire, use.
The specific embodiment
As shown in the figure, this hard cable paying-off device mainly comprises a vertical swivel feeding structure of adjustable inner support and a both sides roller rectification structure.Wherein, the vertical swivel feeding structure of adjustable inner support is in principle, refer to that hard cable drum is that mode by inner support drum inner ring supports fixing, its support degree is adjustable, namely can support the drum of different inner diameters, and wire coil shaft carries out cable 7 feedings to vertical setting and by rotation mode, unwrapping wire namely.Structurally mainly comprise by vertical center shaft 2 and be rotatably installed in the rotating disk 3 on base 1, like this, rotating disk 3 just can, under the support of center shaft 2, freely rotate around center shaft 2 above base 1.On center shaft 2, slip cap is equipped with handle 4, and handle 4 is circular tube shaped, can slide along center shaft easy on and off.Between handle and center shaft, be provided with latching device, by operation latching device, handle 4 can be positioned to the optional position of passed through center shaft 2.On rotating disk 3, be provided with at least two strut members 6, be provided with in the present embodiment three, in figure, only shown wherein two.Strut member 6 can slide between rotating disk 3 middle parts and limit portion, namely from close central axis direction to sliding away from central axis direction.Rotating disk 3 and handle 4 link together by connecting rod mechanism 5, like this, when handle 4 slides up and down along center shaft 2, handle will promote strut member by connecting rod mechanism 5 and move to rotating disk limit portion from rotating disk middle part, referred to as outer, otherwise, pull strut member to be moved to middle part by rotating disk limit portion, referred to as inside contracting.Therefore, by adjusting the height of handle on center shaft, just can control or adjust the position that strut member makes progress in rotating disk footpath, namely control the degree that strut member is opened or inside contracted outward.The quantity of strut member is set to three, and when moving handle, handle will drive each strut member synchronization action, opens or inside contract the consistent of the amount of feeding outside can guaranteeing like this, namely guarantees that the drum after fixing is coaxial with center shaft.
Rotating disk 3 is provided with the slideway 19 corresponding with strut member 6 parallel motion tracks, and the cross-sectional plane of slideway 19 is del or inverted trapezoidal wide at the top and narrow at the bottom.In slideway 19, be provided with and can only slide and the slide bar 20 affixed with strut member bottom along slideway.Because slide bar 20 can only endwisely slip along slideway 19, and slideway 19 is because strut member 6 motion track is originally corresponding, therefore slide bar and strut member affixed after, not only can provide firm support for strut member 6, also just guaranteed the stable support of strut member to drum, and can make strut member 6 outside fixing direction, open or inside contract, and be also difficult for deflection, guaranteed the reliability of service of whole hard cable paying-off device.
In use, first center shaft 2 covers in hard cable wire rim are installed to all strut members 6 outsides, then by release lever 4 and center shaft 2, and along the downward driving handle 4 of center shaft 2.Now, handle can be close to drum inwall by connecting rod mechanism 5 promotion strut members.When strut member withstands on drum inwall and while compressing, handle is locked on center shaft by latching device, now, drum is fixed on rotating disk 3 or center shaft 2 because the support type of strut member 6 clamps.Because the action of each strut member under handle drives is consistent, therefore can guarantee that drum is coaxial with center shaft after clamped.Even if the movement of each strut member is not in full accord, after opening outside stressed, can guarantee the support type of drum to be fixedly clamped.Now drum and center shaft 2 disalignments, but do not affect cable 7 unwrapping wire.While needing unwrapping wire, by the outside tractive of cable head in drum outside, can rotate by drum drive wire coiling center shaft, drum will drive the outside feeding of cable in outside in stressed rotation like this, namely outside unwrapping wire.
Unwrapping wire is complete, removes handle 4 lockings, and upwards pulls handle 4 along center shaft 2, and now each strut member 6 moves to center shaft under handle drives, and also starts to inside contract.When strut member is during away from drum inwall, handle is locked on center shaft 2 by latching device, now can easily residue drum be taken off from rotating disk.While using, directly install to drum all strut members outside and repeat said process along central axle sleeve next time, operates very simple.Because this hard cable paying-off device has adopted and can open the structure that is fixedly clamped that can inside contract outward drum, therefore can be fixedly clamped and unwrapping wire to the drum of various internal diameters, commonality is better.
Both sides roller is corrected structure and is referred to that from cable 7 both sides of drum output, being provided with roller corrects structure, in output cable 7, cable 7 is carried out to roller extruding, thereby realize, correct output line cable type, make to export cable and keep linear pattern or approach linear effect.Structurally, mainly comprise the rectification wheel 8 being arranged on base 1, correct the both sides that wheel 8 lays respectively at cable 7 output trajectories, the rectification wheel 8 of every side is responsible for the cable of this side partly to push rectification.When cable from both sides, correct between wheel through time, if there is crooked or distortion in cable, the rectification wheel of respective side will push to correct its shape to this part cable, is equivalent to have the hand that a pair of slides constantly smoothing out with the fingers straight line cable, contributes to the more straight line style of cable output.In the present embodiment, cable 7 left and right sides are provided with corrects wheel 8, and cable is also provided with rectification wheel 8 in both sides Shang Xia 7.The rectification wheel of the cable left and right sides can be corrected cable in the crooked or distortion on left and right directions, the rectification wheel of the upper and lower both sides of cable can be corrected the crooked or distortion on cable above-below direction, can guarantee that like this cable can export more straight line style.
Stroke sensor 9 is also installed on base 1, the Main Function of stroke sensor 9 be to correct take turns into rotation mileage monitor, namely the length of output cable is detected.The treater 10 being electrically connected to stroke sensor 9 is also installed on base 1, and stroke sensor 9 can send mileage number to treater 10 and process.Treater 10 mouths are electrically connected with telltale 11, and treater shows mileage number by telltale, namely emit the length of cable, very directly perceived.This hard cable paying-off device in use, only need be by cable from conical tube, correct wheel and pull out, operate very simply, a people can operate, and has greatly improved work efficiency.
In the present embodiment, latching device comprises the chute 12 that is axially disposed within center shaft 2 outer walls, and chute 12 is communicated with the inner chamber of center shaft 2, on the internal chamber wall of chute 12 both sides, is evenly equipped with positioning teeth 14.The button 15 extending in inner chamber 13 is installed on handle 4, and button 15 the inners are provided with the positioning pawl 16 coordinating with positioning teeth 14, and the spring 17 that positioning pawl is compressed to positioning teeth is installed on handle 4.Because chute 12 extends axially along center shaft, therefore can guarantee that handle is along the axially movable while of center shaft, the button 15 extending on handle 4 in chute 12 also can move axially along center shaft simultaneously.Positioning teeth 14 on chute 12 both sides internal chamber walls and the positioning pawl 16 of button the inner are the critical components of this latching device, and both are pressed together under the effect of spring 17 elastic force, are namely relatively fixed together.After positioning pawl and positioning teeth are fixing, the button being connected with positioning pawl has also just been fixed on handle on center shaft, has also just realized the locking positioning effect to handle and center shaft.While needing release, only need press button to central axis direction, button can overcome spring force and drive positioning pawl away from positioning teeth, and now positioning pawl and positioning teeth, without any the interaction of power, in free state, are also latch-release, operate very simple.
In the present embodiment, connecting rod mechanism 5 comprises the driving lever 18 that upper end and the hinged lower end of handle 4 and strut member 6 are hinged, driving lever 18 upper ends near center shaft, lower end away from inclined setting.Because driving lever 18 two ends and handle 4 and strut member 6 are all hinged relationship, therefore not only can make handle, by driving lever, power be passed to strut member, can also realize the vertical upper and lower power of handle to the transformation that drives strut member in the horizontal direction power of rotating disk middle part and limit portion parallel motion by hinged matching relationship, be also the break-in of power.Driving lever 18 is done to above-mentioned being obliquely installed, can guarantee that handle 4 can only drive strut member 6 peripheral mobile at the upper link point of driving lever 18, while having avoided because of driving lever 18 vertically, while also going up lower link point vertical alignment, because cannot driving strut member 6, moves the component that do not tilt, also enter and drive dead angle, also effectively avoided that driving lever 18 upper ends are outward-dipping, lower end inwardly (center shaft) tilt, and cause driving strut member to inside contract, can not drive the outer drawback of opening of strut member, that is to say the drawback of the drum that can not be fixedly clamped.
In the present embodiment, correcting base 1 between wheel 8 and rotating disk 3 is provided with difference and the different cable of outbound course is adjusted to the device for regulating direction consistent with correcting the corresponding cable track of wheel automatically highly on drum.Drum is all generally circular, all has thickness, is installed to rear drum on rotating disk and has just had certain altitude, and direction or angle when this just causes the cable 7 outside output on each height are different.Because there is the rectification wheel 8 that cable line style is adjusted in this hard cable paying-off device, therefore for the cable 7 that makes to correct after wheel 8 is corrected has more straight line style, on the cable track between rotating disk 3 and rectification wheel 8, the device that cable track is carried out to tuning must be set.The Main Function of device for regulating direction, exactly by the cable 7 of exporting on differing heights drum position, also be that the different cable of input direction carries out tuning, make it can, with identical or approach identical input direction or angle and be input to and correct between wheel, contribute to the more linear cable of output in when output.Clearly, when the direction of device for regulating direction output cable with correct take turns between the direction of cable in the same way time, auxiliaring effect is best.
Device for regulating direction comprises the horn-like conical tube 21 that entrance is less compared with large outlet, and conical tube 21 inwall middle part uniform ring are provided with cable rolls and coordinate tuning roller 22.Because conical tube 21 is entrance compared with less horn-like of large outlet, so conical tube 21 inwalls are to inside contract gradually and rounding off.Cable on drum is when conical tube 21 penetrates between rectification wheel, even the outbound course of differing heights cable or angle are different on drum, guiding or adjustment through conical tube 21 rounding off inwalls, capital becomes same direction or angle is exported from conical tube 21 outlets, also consistent with the cable course bearing of correcting between wheel 8.Like this, even coil diameter, highly different, after conical tube 21 tunings, can guarantee that each drum cable is with between same direction or angle input rectification wheel, not only commonality is stronger, also play the preliminary shaping to cable 7, made to correct wheel more light and smooth and easy to the secondary rectification of cable 7 or shaping, contributed to finally to export the cable that line style is more straight.Because conical tube is the horn-like of rounding off, so conical tube inwall middle part (vertically) is maximum to the application of force of cable tuning, also maximum to the friction force of cable herein, is unfavorable for the integraty of cable top layer insulation.In this hard cable paying-off device, conical tube inwall middle part is provided with tuning roller 22, and the quantity of tuning roller 22 is a plurality of, arrange, and the rotation direction of tuning roller matches with cable moving direction along conical tube 21 inwall middle part annulars.Like this, cable is through conical tube when middle part, and tuning roller will contact with cable by roll mode and carry out tuning, the friction force to cable while greatly having reduced tuning, and not only cable moves more smooth and easyly, has also guaranteed the integraty of cable insulating layer.
On the inwall of conical tube entrance and exit, also uniform ring is provided with cable and rolls and to coordinate tuning roller 22, can greatly reduce the friction force of conical tube entrance and exit to cable like this, and principle of work and act on similar to the abovely is no longer carefully stated at this.
As shown in Figure 2, in the middle of tuning roller 22, thinner two ends are thicker, and each adjacent tuning roller 22 head and the tail are circular ring to being connected into inner ring.Tuning roller is arranged to obtain to the thick and rounding off in thinner two ends, middle part, namely the axial profile line of tuning roller is arranged to the protruding camber line in middle concave two ends or segmental arc.Because adjacent tuning roller is all to dock successively and encircle to be located on conical tube inwall, therefore, each tuning roller inner shafts can be connected into a circle to outline line, that is to say that each segmental arc can connect into a ring body, and this ring body is circular.Like this, for the ring body inner ring of each tuning roller formation, be just equivalent to the collars of a seamless connection.Therefore, no matter from which direction or angle, enter the cable of conical tube, have one or two corresponding tuning roller normal-running fit with it, guaranteed smoothness that cable moves and the integraty on insulation top layer.
In the present embodiment, stroke sensor 9 comprises the Hall element 23 being arranged on base and is installed in the magnetic patch 24 corresponding with Hall element 23 in the rotating shaft of rectification wheel.While correcting wheel 8 rotation, often circle and can trigger once to Hall element 23 with the magnetic patch 24 of correcting wheel 8 coaxial rotation, the number of turns that treater 10 just can be corrected wheel by Hall element 23 records like this, then be multiplied by and correct the stroke that the girth of taking turns just can calculate the rotation of rectification wheel, the length that namely cable is emitted.Hall element is a kind of conventional sensor, and its structure and principle of work belong to known technology, at this, no longer carefully state.