Summary of the invention
Main purpose of the present invention is to provide a kind of equipment, and described equipment carrys out the defect in the metal wire (preferably steel wire) after filtering drawing by produce fracture at fault location, makes defect can not arrive consumer or end user.Another object is to provide a kind of equipment, described facility compact and can being easily retrofitted on existing drawing machine and/or coil winder.Another object is to provide a kind of simple system of controlling.Last object of the present invention is to provide a kind of method of operating said equipment.
According to a first aspect of the invention, claimed a kind of equipment.Described equipment comprises two capstan winches.In this application, " capstan winch " is the sheave (imagination cylindrical shell) with flat surfaces, above complete turn or the circle segment of wound wire, power is delivered to the wire rod of advancing for the friction by between wire rod and surface on described surface.The flat surfaces of capstan winch limits certain diameter.These capstan winches regularly or be rotatably installed on axle and can on axle, rotate." regularly " the meaning is can not relatively to rotate between axle and capstan winch, and the meaning of " rotatable " is relatively to rotate between capstan winch and axle.
Described equipment comprises: have the first capstan winch of the first capstan winch diameter D1, be arranged on the first axle; And there is the second capstan winch of the second capstan winch diameter D2, be arranged on the second axle.Term " first " and " second " mean order, and " the first capstan winch " should be the capstan winch that first wire rod arrives to the second capstan winch (wire rod leaves described equipment after the second capstan winch) before further advance (can be through pulley, sheave and other devices) during use.These axles itself are rotatable, and can be driven or non-driven.The meaning of " driven " is on (for example,, by the torquematic transmission of direct driving motor, belt, worm and gear, gear-box or any other kind), to apply rotary power (, torque) from reference system to axle.The meaning of " non-driven " is that axle at any time can rotate freely, for example, because axle is arranged on bearing with respect to reference system.
During use, axle rotates (in the situation of non-driven shaft) or is rotated (in the situation of driven shaft), the first axis angular rate W1, and the second axis angular rate W2 with angular speed (being expressed as " radian is per second ").Select angular speed and diameter, make the peripheral speed of the second capstan winch in the situation that not there is not any wire rod be greater than the peripheral speed of the first capstan winch, or D2 × W2/2 is greater than D1 × W1/2, therefore D2 × W2 is also greater than D1 × W1.Angular speed can be applied on each axle respectively, and for example, two axles are driven with the angular speed W1 and the W2 that limit by motor separately.More preferably, the angular speed of two axles is coupled each other with the gearratio W1:W2 fixing.If drive the first axle with angular speed W1, the second axle can rotate with angular speed W2 so, or vice versa.Particularly preferred embodiment is, it is driven there is no axle, but two axles are coupled each other with the gear ratio W1:W2 fixing.In this way, described equipment can as by be pulled through wire rod drive separate unit be introduced in existing wire rod path.
Described filtering equipment is characterised in that, one of described the first capstan winch or second capstan winch are fixedly secured on corresponding the first axle or the second axle, and described the second capstan winch produces shaft coupling by means of torque and connects with the first capstan winch.
The operation principle of described equipment is as follows: in wire rod access to plant, wire rod is maintained on the first capstan winch with the form that is wound into wire rod circle on the first capstan winch.Wire rod keeps enough tension force (referring to below), makes not skid between wire rod and the first capstan winch.Then wire rod is directed on the second capstan winch, and the peripheral speed of the second capstan winch (W2 × D2/2) is at least greater than the peripheral speed (W1 × D1/2) of the first capstan winch.On the second capstan winch, be also wound around abundant circle, make can not skid.
If connecting between the second axle and the second capstan winch is (this is the priori that the present invention does not get rid of) of rigidity, this can cause the percentage elongation ε of wire rod
fixingfor ((W2 × D2/W1 × D1)-1).If this percentage elongation is greater than the maximum elongation at break A of wire rod
t, wire rod will rupture so.Due to A
tconventionally not very large (being generally less than 3% for this steel wire of anticipation), so need to control well the ratio of W2 × D2/W1 × D1.
The problem also existing is, in the time applying fixing percentage elongation, purely applies based on friction, and friction can be depended on the surface of wire rod characteristic, capstan winch and surface condition, environmental condition (for example temperature and humidity) and changing even.On capstan winch, the cooling meeting of wire rod causes for example thermal contraction, and this can be superimposed upon on the percentage elongation that capstan winch applies.This with for example friction stable (wire rod is immersed in fluid lubricant, make capstan winch cooling and in steady temperature) and to apply by drawing die the situation occurring in the wet type drawing machine of percentage elongation contrary.
Inventor is surprised to find, by between the first capstan winch and the second capstan winch, introduce torque produce shaft coupling, greatly solved to friction sensitiveness and to control the needs of the percentage elongation applying by the ratio of W2 × D2/W1 × D1.The existence meeting of this shaft coupling produces constant power at the wire rod that advances to the second capstan winch from the first capstan winch, and needn't on wire rod, apply constant percentage elongation again.In addition, simple adjustment torque generation device just can apply and be greater than 0 and be less than or equal to F on wire rod
fixingany tension force, F
fixingequal AE ε
fixing, wherein, A is sectional area, and E is the modulus of wire rod.
Another benefit is that (W2 × D2/W1 × D1)-1 can be chosen as the percentage of total elongation A higher than wire rod substantially
t.Remain on below the torque of closed coupling by the torque that shaft coupling is produced, do not have the risk that applies excessive percentage elongation on wire rod.
Owing to there is torque generation device, the linear velocity of the wire rod on the second capstan winch can be greater than the linear velocity of the wire rod on the first capstan winch.Difference depends on the ratio of W2 × D2/W1 × D1.The linear velocity V2 of the wire rod on the second capstan winch is only less times greater than the linear velocity V1 of the wire rod on the first capstan winch.The ratio of linear velocity V2/V1 equals percentage elongation and adds 1(ε+1), percentage elongation is the result of wire rod tensioning.So no matter whether have during use wire rod, the second linear velocity is all greater than First Line speed.
The power path forming along the axle, belt or the gear that the first capstan winch are mechanically connected to the second capstan winch, torque produces shaft coupling can be positioned at different positions.This power path and the power path balance that wire rod forms during use.The optimum position that torque produces shaft coupling is:
■ torque produces shaft coupling between the second axle and the second capstan winch; Or
■ torque produces shaft coupling between the first axle and the first capstan winch; Or
■ torque produces shaft coupling between the first axle and the second axle; Or
■ torque produces shaft coupling between the first capstan winch and the second capstan winch.
It is preferably adjustable that torque produces shaft coupling.Adjusting can be carried out or can be to carry out continuously with discrete step.
It is simple friction coupling that available torque produces shaft coupling, wherein, uses normal direction controlled force that friction piece (for example, ring type brake pad) is shifted onto on brake disc.The problem be here brake pad wearing and tearing, generation heat and be difficult to control the torque producing.It is powder coupling that other torques produce shaft coupling, and wherein, torque is transmitted by the powder (normally metal dust) between disc, and disc is pressed together by controlled normal force.If powder is ferromagnetic powder, the magnetic field that the apparent viscosity of powder can produce by for example solenoid (powder coupling) is so controlled.Also can use fluid axle connector, wherein, several for example, to the fluid transmitting torque between disc (, be connected to the even number disc on capstan winch, be connected to the odd number disc on the second axle).The transmission of torque can be because viscosity changes (viscous fluid shaft coupling), also or by the turbine of impeller-runner combines to exchange momentum.
But up to the present, most preferred shaft coupling is magnetic shaft coupling.In magnetic shaft coupling, be fixed on alternation magnetic pole magnet ring on axle for example (current high-performance magnet, for example, based on the magnet of neodymium-iron or samarium-cobalt) with a gap with to be fixed on alternation magnetic pole magnet ring in corresponding capstan winch drive hole spaced apart.In the time that torque is on axle or on capstan winch, this torque meeting is delivered to respectively on capstan winch and axle by magnetic field.The quantity of magnet can determine the smoothness (magnet is more, transmits more smooth and easy) of transmitting.Because the magnetic field intensity of permanent magnet reduces fast along with the increase of distance, so the amount of torque transmitting depends on the width in gap.Therefore, realized the adjusting of the torque to producing by means of simple gap adjustment.Thereby do not need normal force to control, this makes magnetic shaft coupling become most preferred shaft coupling.In gap, can there be vacuum or air or fluid or separator disc or axle sleeve.
Substantially there are two kinds of designs: axial design, wherein, magnetic field line is parallel to rotating shaft (magnet arrangement is on disc in this case); Or radial design, wherein, the magnetic field line of magnet is along radially.In this case, a magnet ring is arranged in another magnet ring.Radial design is most preferred, because this allows easily to install shaft coupling between axle and capstan winch.
Axle is preferably placed in plane parallel to each other.More preferably, axle is parallel to each other.Alternative or can be additionally, preferably axle and capstan winch be arranged such that to arrive the lip-deep wire rod of capstan winch and the wire rod that leaves from capstan winch surface in square with the axis plane.In the time that axle is parallel, this means that two capstan winches are positioned at same plane, suppose and in wire rod path, do not have deflector (for example, sheave or roller).This more easily realizes the fixed gear transmission between two axles because gear can between axle and in the parallel plane plane of capstan winch in.These axles can also be coaxial, that is, an axle is in another axle, and wherein, another axle adopts the form of hollow shaft.
Most preferred embodiment is that the first axle and the second axle are integrated and are same axle,, only has an axle that is.Yes has saved axle for first advantage of this form.Second advantage is that gearratio W1:W2 is fixed as 1:1 automatically.The 3rd advantage is to save space.The 4th advantage is that this mode can be transformed the existing machine that has capstan winch with filtering equipment, for example, and drawing machine and/or coil winder.This single axle can be driven or non-driven.Driven shaft can be for example the driving shaft of bracing wire capstan winch or coil winder capstan winch.Particularly preferred embodiment is that these single axle right and wrong are driven.So just can on wire rod path, introduce described equipment as separate unit.Then, described equipment is driven by the wire rod being pulled through described equipment, and still plays the effect of defect stripper.
In order to guide wire rod to the second capstan winch from the first capstan winch, can on wire rod path, introduce one or more reversing rollers in this single shaft embodiment.A reversing roller is just enough in principle.Via reversing roller, wire rod is directed to the second capstan winch from the first capstan winch.Preferably, introduce reversing roller and make can on wire rod, not produce back-flexing.Thereby along wire rod, bend is always in same direction on wire rod path.Back-flexing meeting causes distortion on wire rod.
By braking or drive reversing roller, can introduce extra tension force control.If drive reversing roller with the linear velocity that is greater than W1 × D1/2, wire rod can be subject to additional tension between the first capstan winch and reversing roller so, and tension force between reversing roller and the second capstan winch can reduce.Alternately, reversing roller can be braked, and in this case, tension force between reversing roller and the second capstan winch increases, and tension force between the first capstan winch and reversing roller reduces.
A good alternate embodiment is to have two rollers.The first roller is associated with the first capstan winch, and second roller is associated with the second capstan winch.Two rollers can rotate independently of one another.The function of roller is to prevent that wire rod circle follow-up on capstan winch from interfering with each other.By wear wire material circle on roller and the capstan winch that is associated, the follow-up wire rod circle on single capstan winch extends and can be not interfering with each other during advancing.By being placed to, commutation roll shaft become low-angle (but both are still in same plane) can further affect extension with described single axle.
In another preferred embodiment, in the wire rod path of described equipment, introduce straightener.Straightener or " straightener " are a series of grooved rollers in single plane substantially, and wherein, the back-flexing repeatedly in this plane will produce required residual stress on wire rod.Use the object of straightener different: to introduce straightener to make wire rod there is certain moulding (moulding is the roughly curvature having) in the time that wire rod is freely sagging; Or antithesis, wire rod is straightened.Straightener can also be used for affecting the residualinternal stress on wire rod.For example, the compression in known surface can improve the fatigue resistance of wire rod.The content of this respect is referring to US4, and 612,792.Another purposes is summary by grooved roller being placed on to reference planes top or below and at wire rod or even produce on cord and reverse slightly.Straightener is normally used in combination: different straightener arranged in series, and angulation (for example, vertical) between reference planes, and wire rod is aimed at along the intersection of these planes substantially.
The function of straightener is intricate.But the important parameter of the correct work of straightener is must be constant through the tension force of the wire rod of straightener, and preferably controllable.This realizes by the said equipment.By straightener being placed in the wire rod path between the first capstan winch and the second capstan winch, the function of straightener is greatly improved and is not easy and changes.
Wire rod path can be divided into multiple districts.Inlet region, can extend to the wire rod circle on the first capstan winch on reversing roller (if existence).Wire rod in " inlet region " is with the entrance tension force T of wire rod
1(, the tension force before capstan winch) enters, and tension force is elevated to tension force T in " tensioning district "
2.In " tensioning district ", wire rod leaves the first capstan winch and arrives the second capstan winch, thereby can pass through reversing roller.In " tensioning district ", tension force is in being produced the tension force that causes of shaft coupling and be controlled by torque.Finally, wire rod is irised out through the wire rod of " outlet area ".In " outlet area ", wire rod is with tension force T
2enter and with outlet tension force T
3out, outlet tension force T
3can be greater than T
2, but be preferably less than T
2.Outlet area starts from wire rod and enters the second capstan winch, may extend on reversing roller and from the second capstan winch region out.
Straightener can be positioned at inlet region, tensioning district or outlet area.Straightener is preferably positioned at tensioning district, because tension force is stable and controllable in this district.In inlet region, tension force can be at T
2between change, and depend on the friction between position and wire rod and the capstan winch of wire rod circle.The tension force of the wire rod circle of close inlet region end can more approach T
2, there is at the wire rod circle of inlet region section start the T of approaching
1tension force.In the situation that suitably changing, there will be same effect at outlet area: tension force depends on that the friction between position and wire rod and the capstan winch of wire rod circle can be at T
In the time that straightener is positioned at tensioning district, be necessary to set up reversing roller, so that wire rod is easily through straightener.
According to a second aspect of the invention, provide a kind of drawing machine that comprises above-mentioned filtering equipment.This drawing machine can be dry type drawing machine (lubricating with powdery soap in the time that wire rod is pulled through drawing die), or can be wet type drawing machine (mould in die clamper is immersed in fluid lubricant).In any situation, after filtering equipment is arranged in last drawing die, (the application, " last drawing die " is the mould with minimum diameter.Synonym is " head mould ") and without any need for lubricated, because enough frictions are very important to the correct work of described equipment.
Particularly preferred embodiment is the first capstan winch corresponding to the towing capstan after last mould, that is, pull the wire rod of final diameter by a capstan winch of last mould or head mould.The first axle is corresponding with the axle of a capstan winch.The second capstan winch can be arranged on the second axle, and described the second axle is to become fixing gearratio to rotate with the first axle.Or even more preferably, the second capstan winch is also arranged on the axle of the first capstan winch, the axle of described the first capstan winch is the axle of a capstan winch.
According to a third aspect of the invention we, claimed a kind of comprising according to the coil winder of the filtering equipment of first aspect present invention.Coil winder has unwrapping wire section (for exporting wire rod) and winding unit (for wire rod is wrapped in to support) conventionally.Filtering equipment can easily be retrofitted on existing coil winder.In particularly preferred embodiment, demand motive device does not make equipment work.Capstan winch rotates by means of being pulled the wire rod passing through.Certainly, last winding unit must can be exported enough power, produces so that capstan winch rotates and overcomes torque the torque that shaft coupling produces.
According to a forth aspect of the invention, described a kind of by using the method for carrying out the defect in filtering steel wire according to the equipment of first aspect present invention.First, such as with tension force T
1test wire rod is fed to described equipment (from paying out reel, drawing machine or any other known devices for generation of wire rod or processing wire rod).Wire rod on the first capstan winch, reel first one circle or multi-turn.In the time that getting back to the starting point place of wire rod on capstan winch, wire rod just completes a circle.If wire rod exists straightener in path, can guide so wire rod to pass through described straightener.Then wire rod advances according to wire rod path by reel second circle or multi-turn on the second capstan winch.Wire rod is with tension force T
3be drawn out from the second capstan winch.In wire rod path (" tensioning district ") between the first capstan winch and the second capstan winch, wire rod is in tension force T
2under.Here it is " test tension force ", and test tension value can regulate by regulating simply torque to produce shaft coupling.
In the time there is flattening machine, wire rod can be less times greater than the test tension level before entering straightener, because need some power to pull wire rod to pass through straightener in the test tension level through after straightener.In any case this deviation is all quite little.
According to the test tension level producing on wire rod, can realize different-effect.Further between the operating period, be applied to the tension force on wire rod if test tension force is greater than, wire rod has been reached the degree being enough to for it by the degree of filtering defect so, and this is first favourable application.Example is on the sawline of multi-thread saw, to apply 25N tension force.The test tension force of setting 30N can cause filtering defect substantially.For example, test tension force can be set for and be greater than 20% or 30% or even 40% of wire rod breaking load.As long as wire rod remain in its elastic range (elastic range of most of wire rod extend to breaking load up to approximately 70%, the elastic range of some wire rods extend to breaking load up to 80%, and the elastic range of high tensile wire rod extend to breaking load up to 90%), except filtration result, can on wire rod, not cause so special variation.
Second favourable purposes is, when plastic range (, the breaking load of most of wire rod more than 70% of test tension force in wire rod, the more than 80% of the breaking load of some wire rods, and the more than 90% of the breaking load of special-thread) time, except filtration result, can cause the variation of wire rod.For example, the moulding of wire rod can change.Another favourable purposes is the residualinternal stress changing in wire rod.When in the time that straightener is combined, can more easily realize this modeling effect or residualinternal stress effect, because straightener is by being added to bending stress in the tensile stress applying and the some parts in wire rod cross section can being brought up to mecystasis.
For the correct work of described equipment or method importantly, the quantity of described first circle or multi-turn and the quantity of described second one circle or multi-turn should be enough to make between wire rod and the first capstan winch and between wire rod and the second capstan winch, can not skid during use.Skidding on capstan winch generally set up model by Euler's friction formula: if the outlet tension force T at capstan winch place
go outremain and be greater than Τ
-μ θ, wherein, T
enterbe the tension force that wire rod enters capstan winch place, μ is that angle coefficient of friction is (with rad
-1for unit), and θ is total contact angle (take radian as unit, a circle is corresponding to 2 π, and " contact " is between wire rod and capstan winch), so can not skid.This criterion is applied to the second capstan winch (T
3with respect to T
2) and the first capstan winch (T
2with respect to T
1) can obtain the required number of turns.As general rule, second one circle or the quantity of multi-turn are greater than the quantity of first circle or multi-turn, because outlet tension force is normally minimum.
Because coefficient of friction " μ " should be enough large, so in any case all should avoid using anti-friction agent (lubricant, oil, wax or other) on capstan winch.
First circle or multi-turn can be distributed between the first capstan winch and at least one reversing roller.Because the contact angle between wire rod and capstan winch reduces, the quantity of first circle or multi-turn must be carried out adaptation simultaneously.Alternately or side by side, second one circle or multi-turn can be distributed between the second capstan winch and at least one reversing roller.Second one circle or the quantity of multi-turn must be carried out adaptation thereupon.
A kind of method that uses the said equipment comprises the following steps:
Supply metal wire to be measured, for example steel wire;
Described wire rod is reeled on described the first capstan winch first one circle or multi-turn;
Alternatively, guide described wire rod through straightener;
Described wire rod is reeled on described the second capstan winch second one and enclose or multi-turn;
Extract described wire rod out from described equipment;
It is characterized in that:
Regulate described torque to produce shaft coupling, make at described wire rod to produce constant test tension force from described the first capstan winch during to described the second capstan winch when described wire rod.
Described method can further be supplemented following characteristics: regulate described torque generation device to the torque that produces test tension force, at least 20% of the breaking load that described test tension force is described wire rod.
In above-mentioned two kinds of methods, the quantity of first circle or the quantity of multi-turn and second one circle or multi-turn is not even as big as skidding between wire rod and the first capstan winch and between wire rod and the second capstan winch.
The above-mentioned three kinds of methods of equipment that use the first and second axles to merge further have following characteristics: described first circle or multi-turn are shared between described the first capstan winch and described at least one reversing roller, and described second one circle or multi-turn shared between described at least one reversing roller and described the second capstan winch.
Particularly preferred method is that capstan winch drives by means of being pulled the wire rod passing through.
The specific embodiment
Fig. 1 has schematically described the capstan winch on drawing machine 100.Directed and encompass circle at a capstan winch 106 and reversing roller 108 from head mould 104 wire rod 102 out.Capstan winch is fixedly mounted on driven shaft 124.Reversing roller 108 can also have other functions, for example length metering wheel.After several circles, wire rod leaves machine through sheave 110.The number of turns is enough to overcome traction wire rod through the required power of head mould.
Fig. 5 shows the equipment 500 in embodiment with two axles.Wire rod 518 is access arrangement on the first capstan winch 504.Wire rod 518 on the first capstan winch, reel first one circle or multi-turn.The first capstan winch 504 is fixedly connected on the first axle 502.The diameter D1 of the first capstan winch 504 equals 2 × R1.In this example, the first axle 502 is driven.Wire rod 518 advances on the second capstan winch 508 along its path.Wire rod encloses or multi-turn around second one again on the second capstan winch.The diameter D2 of the second capstan winch 508 equals 2 × R1.
The second capstan winch 508 is connected on the second axle 506, and the second axle 506 is fixedly connected on gear 516, and the second axle 506 is driven by gear 516.Gear 516 engages with reversing wheel 512, reversing wheel 512 then be fixedly connected to axle 502 on and the gear 514 that is therefore also fixedly connected on capstan winch 504 engage.Introduce reversing wheel 512, two capstan winches are rotated in same direction.If gear 514 and 516 directly engages (without reversing wheel), the wearing to lead and can cause wire rod back-flexing undesirably of wire rod circle so.
The number of teeth of the second gear 516 is less than the number of teeth of the first gear 514, and this makes the angular speed W2 of the second axle be greater than the angular speed W1 of the first axle.Even so D1 equals D2, also can meet the condition that W1 × D1 is less than W2 × D2.In this embodiment, R1 is chosen to be slightly less than R2 wittingly, and this can make the ratio of W2 × D2/W1 × D1 increase to the elongation at break A of wire rod 518 in the time of test
The connection of the first capstan winch 504 to second capstan winches 508 is to produce for example Friction disc coupling of shaft coupling 510 by torque to realize.In this embodiment, shaft coupling is between the second capstan winch and the second axle.Can regulate shaft coupling by augmentativity to frictional force.The wire rod that extends to the second capstan winch from the first capstan winch is subject to the test tension force T that can control by shaft coupling
2.Local fracture load is lower than T
2any wire rod defect all can be eliminated.Test tension force can for example for example, be measured by wire tension meter (, Hans-Schmidt).In the time that demarcation is used for different tension force, can adopts the adjusting of friction coupling is set to test tension force.
Select the number of turns n of second one circle or multi-turn
2, make can not skid, that is, and T
3(outlet tension force) is greater than T
2× exp(-μ n
22 π).Similarly, select the number of turns n of first circle or multi-turn
1, make can not skid on the first capstan winch, that is, and T
2be greater than T
1× exp(-μ n
1the tension force of wire rod in porch.
Fig. 2 shows the more practical embodiment of the filtering equipment 200 of implementing on existing drawing machine.The first capstan winch 206(is also the capstan winch after head mould 204) be fixedly mounted on the motor-driven driving shaft 224 by drawing machine.First circle of wire rod 202 or multi-turn are worn and are led on reversing roller 208, and capstan winch 206 is shared 4 circles with reversing roller 208.Wire rod advances at the 5th circle the second capstan winch 212 being arranged on same driving shaft 224.The second capstan winch is arranged on axle 224, between the second capstan winch and this axle, has bearing 230.Therefore, W1 equals W2, because only there is an axle.From then on start, wire rod is upper separately around approximately 12 circles at the second capstan winch 212 and the second reversing roller 208 '.The second reversing roller 208 ' is independent of the first reversing roller 208 and rotates.The second capstan winch 212 produces shaft coupling 214 by torque and is connected on the first capstan winch 206, and it is the radial magnetic coupling easily regulating that torque produces shaft coupling in this example, has division indicator, makes it possible to setpoint torque level reliably.In this embodiment, torque generation device is positioned between the second axle (identical with the first axle) and the second capstan winch.
In another embodiment shown in Fig. 3, on the basis of the embodiment of Fig. 2, increase flattening machine 318, the tensioning district (, wire rod from first capstan winch advance to the region of second capstan winch) of flattening machine in wire rod path.In the accompanying drawings, similar part represents with similar units and tens.Introduce another reversing roller 316, to allow straightener 318 to be convenient to install.Wire rod 302 through straightener keeps constant test tension force.In addition, the back-flexing repeatedly of straightener causes extra bending stress in wire rod, and this even more contributes to the defect point on filtering wire rod.
In Fig. 4, illustrate the alternative location of torque generation shaft coupling.Equipment or single shaft layout, wherein, the first capstan winch 406 and second capstan winch 412 both shared same axles 424.Now, the second capstan winch 412 is fixedly connected on axle 424, and the first capstan winch 406 is rotatably connected on axle 424 by means of bearing 430.In this embodiment, torque produces shaft coupling 414 between the first capstan winch and the second capstan winch.
In above-mentioned different embodiment, these capstan winches can also be by with tension force T
3drive from the wire rod of the second capstan winch pull-out, rather than by driving the first axle to drive.In fact,, if there is enough number of turns on the second capstan winch in case principal vertical line material skids, drive the tension force T of described equipment
3can be lower than the test tension force T causing
2(being set by magnetic shaft coupling 214,314,414).It is higher that torque produces shaft coupling setting, tension force T
2just larger, and must on the second capstan winch 412, be wound around the more number of turns.Especially, be suitable as stand-alone device according to the embodiment of Fig. 4, wherein, power enters by the second capstan winch and produces shaft coupling by torque and is delivered to the first capstan winch.