CN106286639A

CN106286639A - Torque limiter and there is the suspension system of this torque limiter

Info

Publication number: CN106286639A
Application number: CN201610648637.0A
Authority: CN
Inventors: 孙俊杰; 卢正清
Original assignee: Neusoft Medical Systems Co Ltd
Current assignee: Neusoft Medical Systems Co Ltd
Priority date: 2016-08-09
Filing date: 2016-08-09
Publication date: 2017-01-04
Anticipated expiration: 2036-08-09
Also published as: CN106286639B

Abstract

The present invention provides a kind of torque limiter and has the suspension system of this torque limiter, can ensure that when balanced controls fault hanger does not drops, and reduction operator lifts the active force of hanger when moving out of control, it is ensured that the safety in utilization of suspension system.The torque limiter of the present invention includes the tumbler with some grooves and rolls the ball being connected in each described groove, each described groove is circumferentially distributed, and axial cross section is V-shaped, the two side of V-type is about the asymmetric setting in axis of described groove, so that the torque that described tumbler rotates clockwise in the circumferential and rotates counterclockwise.The present invention also provides for a kind of suspension system, including the hanger and the balance force mechanisms that form equalising torque around support shaft, described support shaft connects driving source, described support shaft is connected with described driving source by above-mentioned torque limiter, and the high pulling torque direction of described torque limiter is to limit the direction that described hanger falls.

Description

Torque limiter and there is the suspension system of this torque limiter

Technical field

The present invention relates to torque limit technical field, particularly relate to a kind of torque limiter and there is this torque limiter Suspension system.

Background technology

DR system, i.e. direct digital radiograph system, be by electronic cassette, scanning monitor, system controller, Image display monitor central monitoring systems etc. form, and are directly by electronic cassette, x-ray photon to be converted to digitized image, are that one is sensu lato directly Connect Digital X-ray Radiotive.According to rack construction, it is divided into suspention DR and column DR.

Refer to Fig. 1, Fig. 1 is suspention DR system structural representation in one embodiment in prior art.

As it is shown in figure 1, in suspention DR system, bulb 1 ＇ is as hanger, with equilibrant mechanism 2 ＇ office support shaft 3 ＇'s Both sides, form equalising torque around support shaft 3 ＇；Support shaft 3 ＇ and rope sheave 5 ＇ is driven to rotate by motor 4 ＇, it is achieved bulb 1 ＇'s Lifting.It is directly connected to support shaft 3 ＇ at motor 4 ＇, or is connected by clutch.

In the embodiment that motor 4 ＇ is directly connected with support shaft 3 ＇, when equilibrant mechanism 2 ＇ breaks down, the most flat Weighing apparatus force rate hanger gravity is little, causes bulb 1 ＇ to drop and hurt sb.'s feelings, by the holding torque of motor 4 ＇ self, it is also ensured that ball Pipe 1 ＇ does not drops.This embodiment there is problems of, if it occur that control out of control, when bulb 1 ＇ overwhelms patient downwards, Even if power-off, bulb 1 ＇ also cannot easily be lifted and make patient depart from compressing by operator.

In the embodiment that motor 4 ＇ is connected with support shaft 3 ＇ by clutch, when equilibrant mechanism 2, ＇ breaks down Time, i.e. equilibrant is less than hanger gravity, causes bulb 1 ＇ to drop and hurt sb.'s feelings, if clutch is adhesive, and clutch torque Being greater than unbalanced moments, as a example by unbalanced moments M >=11.5Nm, corresponding out-of-balance force is 25kg, this out-of-balance force mistake Greatly so that clutch is difficult to overcome；If clutch is off, such as power-off or when manually moving, bulb 1 ＇ will Drop, people may be hurt.

Above two embodiment, all can not destroy equilibrant simultaneously and uncontrolled movements makes response reliably.

Summary of the invention

The invention provides a kind of torque limiter and there is the suspension system of this torque limiter, it is possible at balanced controls Ensure during fault that hanger does not drops, and reduction operator lifts the active force of hanger when moving out of control, it is ensured that be outstanding The safety in utilization of crane system.

For solving above-mentioned technical problem, a kind of torque limiter provided by the present invention, including the rotation with some grooves The ball that part and rolling are connected in each described groove, and each described ball is pressed on the compression in corresponding described groove Part, each described groove is circumferentially distributed, and axial cross section is V-shaped, the two side of described groove angle to axial, so that Described tumbler rotates clockwise and rotates counterclockwise corresponding torque limit value in the circumferential and differs in size.

The torque limiter of the present invention, is set to groove V-structure, and the angle that the two side of V-type is to axial is not Deng, then the abjection moment that ball is corresponding when being deviate from by the both sides of groove is different, and wherein the abjection moment of side is big, taking off of opposite side Go out moment little, then the torque limit value that tumbler is corresponding when rotating clockwise and rotate counterclockwise differs in size so that two Rotation direction provides the torque limit value that differs in size, it is possible to be applicable to that two rotation direction torque limit values of requirement do not wait is System, meets the specific demand of this system, to assist the safety of raising system, meanwhile, when rotating towards the direction of high pulling torque, Saving manpower can also be assisted, improve simple operation.

The present invention also provides for a kind of suspension system, including the hanger and the equilibrant machine that form equalising torque around support shaft Structure, described support shaft connects driving source, and described support shaft is connected with described driving source by above-mentioned torque limiter, described The high pulling torque direction of torque limiter is to limit the direction that described hanger falls.

Owing to, in torque limiter, big near the abjection moment that an axial sidewall abjection is corresponding by groove, this side is corresponding The direction that abjection moment is big, then can be arranged on the direction and limit the direction that hanger falls；When balanced force structure occurs event During barrier, the poised state between equilibrant mechanism and hanger is broken, and there is the unbalanced moments driving hanger to fall, and Owing in now torque limiter, the torque direction of tumbler is in and limits the direction that hanger falls, to resist out-of-balance force Square, it is to avoid hanger falls and hurts sb.'s feelings；When time out of control, if hanger moves downward always and likely hurts sb.'s feelings, operator Need to be lifted up hanger, now need the power overcome to be only little moment and the moment of friction sum of torque limiter, the least Unbalanced moments under equal conditions so that operator lifts hanger more easily, improves simple operation and peace Quan Xing.

Accompanying drawing explanation

Fig. 1 is suspention DR system structural representation in one embodiment in prior art；

Fig. 2 is that ball and the groove of prior art and torque limiter provided by the present invention are in a kind of detailed description of the invention In stress schematic diagram；

Fig. 3 is the torque limiter provided by the present invention stereochemical structure sectional view in a kind of detailed description of the invention；

Fig. 4 is axle side structure schematic diagram when being provided with ball of the tumbler of torque limiter shown in Fig. 3；

Fig. 5 is the perspective view of tumbler shown in Fig. 4；

Fig. 6 is the cross-sectional view that in torque limiter shown in Fig. 3, ball is in groove；

Fig. 7 is the cross-sectional view that in torque limiter shown in Fig. 3, ball is extruded outside groove；

Fig. 8 is suspension system provided by the present invention principle schematic in one embodiment；

Fig. 9 is the stereochemical structure partial schematic diagram of suspension system shown in Fig. 8；

Figure 10 is the stereochemical structure overall schematic of suspension system shown in Fig. 8.

In Fig. 1:

Bulb 1 ＇, equilibrant mechanism 2 ＇, support shaft 3 ＇, motor 4 ＇, rope sheave 5 ＇；

In Fig. 2-10:

Groove 1, tumbler 2, ball 3, hanger 4, equilibrant mechanism 5, support shaft 6, drive source 7, torque limiter 8, Rope sheave 9, steel wire rope 10, retracting cylinder 11, compressing member 12, annular pressing plate 13, disc spring 14, collet threaded circle 15.

Detailed description of the invention

Below in conjunction with accompanying drawing, the present invention is specifically introduced, in order to those skilled in the art accurate understanding present invention's Technical scheme.

As illustrated in figs. 2-7, the torque limiter of the present invention includes the tumbler 2 with some grooves 1 and rolls connection Ball 3 in each groove 1, each groove 1 is circumferentially distributed, and the axial cross section of each groove 1 is V-shaped, and the two side of this V-type is mutually countershaft To angle during so that tumbler 2 rotates clockwise in the circumferential and rotates counterclockwise, the two side of groove 1 is to rolling The circumferential amount of force that pearl 3 applies, and then form the torque limit value differed in size.

Wherein, the two side of groove 1 all could be arranged to plane, so that groove 1 forms inverted triangular pyramid type；Or Person, the two side of groove 1 can also be disposed as arc, so that groove 1 forms inverted pyramid type；Also or, groove 1 Two side can use different linear structures, and wherein side is plane, and opposite side is arc.

Meanwhile, the bottom of groove 1 can be plane or arc, to form the structure that bottom land is cut；Or, groove 1 Bottom can be the summit intersected by two side.

In other words, due to asymmetrical various structures, those skilled in the art can be arranged as required to the concrete of groove 1 Version.

As herein described is comparatively speaking clockwise and anticlockwise, is intended merely to distinguish two contrary rotation directions.

As herein described axially, circumference and be all radially with the arragement direction of groove 1 for reference to being defined, with each recessed The direction of groove 1 cincture is circumference, then the direction of the plane being perpendicular to this circumference place is axially, in the plane at this circumference place In, the direction being perpendicular to circumference is radially.

The torque limiter of the present invention, owing to the axial cross section of groove 1 is in the V-type not waited about axial angle so that During tumbler 2 rotates, ball 3 is when contacting respectively with the two side of groove 1, can produce the active force differed in size, enter And make ball 3 outwards be deviate from required abjection moment by the both sides of groove 1 and differ in size, as shown in Figure 4 and Figure 5；When ball 3 By less abjection moment corresponding when outwards deviating from away from axial side, illustrate that the abjection difficulty of now ball 3 is less, when turning When moving part 2 rotates towards the direction that ball 3 is deviate from by this side, corresponding torque limit value is the least；Otherwise, when ball 3 by Corresponding bigger abjection moment when outwards deviating near axial side, illustrates that the abjection difficulty of now ball 3 is bigger, works as rotation When part 2 rotates towards the direction that ball 3 is deviate from by this side, corresponding torque limit value is the biggest.For purposes of illustration only, it is fixed herein Justice ball 3 is by when outwards deviating near axial side, and the rotation direction of tumbler 2 is forward, otherwise be reverse, then forward Rotating torque is more than reverse rotating torque.

Visible, in the torque limiter of the present invention, when tumbler 2 rotates towards two different directions, corresponding moment of torsion Limits value differs in size, it is possible to meets the specific demand not waited both direction torque limit, and then is applicable to a direction The operating mode that the demand of torque limit value is big, the demand of another direction torque limit value is little；On the one hand, torque limit value is needed Wanting big direction, big torque limit value can assist realization carrying, improves the stable of torque limiter place system and safety Property, on the other hand, for the direction that torque limit value demand is little, when can reduce out of control, lift the active force needed for hanger 4, Improve property easy to use.

In a particular embodiment, the two side of groove 1 can tilt the most to axial, now can be about groove 1 The asymmetric setting in axis, to form the angle of inclination do not waited, it is provided that moment of torsion that both direction differs in size limit Value processed, torque limiter now is that the torque limit value of double-direction twist moment limiter, only both direction differs in size.

Or, in the two side of groove 1, wherein a sidewall can extend in the axial direction, and another sidewall tilts to axial Arranging, now, the moment of torsion needed for ball 3 is deviate from by axially extended sidewall is close infinitely great so that ball 3 is the most impossible By this lateral outer abjection, then another sidewall that ball 3 is merely able to by tilting outwards is deviate from, and torque limiter now is unidirectional Torque limiter, i.e. limit ball 3 outwards deviate from by axially extended sidewall, tumbler 2 towards the direction rotates time, correspondence Torque limit value is infinitely great；Otherwise, when tumbler 2 rotates towards another direction contrary with the direction, according to set Torque limit value is deviate from.

On the basis of the above, present invention additionally comprises the compressing member 12 in the groove 1 that each ball 3 is pressed on correspondence.Each rolling Pearl 3 is inlaid in the groove 1 of correspondence, and each groove 1 is circumferentially distributed, then compressing member 12 can be correspondingly arranged with each ball 3, and is in Axial one end of ball 3, thus ball 3 is applied axial pressing force, in order to by each ball 3 axial compression at corresponding groove 1 In.

There is certain relation with abjection moment in the thrust of ball 3, during tumbler 2 rotates, with its two side In wherein side ball 3 is applied active force, this active force ball 3 axially on component overcome the thrust of compressing member 12 Time, ball 3 is possible to outwards deviate from groove 1 along this sidewall.

So, corresponding different operating mode, ball 3 is accomplished by having different thrusts, so as to adapt to different operating mode Use demand, then compressing member 12 could be arranged to the adjustable version of thrust, such as holddown spring, tightens the structures such as screw Form, in order to those skilled in the art regulate thrust as required, meets the use demand of different operating mode.

In a kind of specific embodiment, compressing member 12 can have ring compression face, and this ring compression face is recessed with each The loop configuration that groove 1 surrounds is corresponding, may be at the axial surface of each surrounded loop configuration of groove 1, in order to annular pressure Tight face is corresponding with the ball 3 in each groove 1, and then axially compresses each ball 3 so that each ball 3 is pressed on corresponding groove 1 In.

Specifically, this compressing member 12 can include annular pressing plate 13, disc spring 14 and collet threaded circle 15, and three is at groove 1 axially set gradually, collet threaded circle 15 is screwed onto axial one end of tumbler 2, and compresses towards the direction at groove 1 place Disc spring 14 so that disc spring 14 axially compresses annular pressing plate 13, annular pressing plate 13 deviates from the one side of disc spring 14 and i.e. forms ring compression Face, corresponding with the loop configuration at each groove 1 place, in order to each ball 3 is pressed in corresponding groove 1；Now, each groove 1 circumferentially distributed at this annular pressing plate 13, can be to be uniformly distributed, as shown in Fig. 3,6 and Fig. 7.

Tumbler 2 can be cylindric with what compressing member 12 was coaxially disposed, and groove 1 now is also in the week of this tumbler 2 To distribution, equally distributed form specifically can also be used to arrange.

As in figure 2 it is shown, the opening of each groove 1 may be at being parallel in the same plane in ring compression face, in order to respectively The uniformly applied thrust of ball 3, improves the compression reliability of ball 3, and then ensures the reliability service of torque limiter.And And, the edge of groove 1 opening part is in same plane so that the degree of depth that ball 3 embeds groove 1 is consistent so that groove 1 is to rolling Pearl 3 circumference restraining forces generally maintains consistent, and then controls its dependent variable of ball 3 abjection, the shape of groove 1 is become as unique Amount, improves controllability and the control accuracy of abjection moment.

Specifically, in conjunction with Fig. 2 and Fig. 3, version and the principle of setting asymmetric to two side are carried out specifically Bright.

Sink in groove 1 as in figure 2 it is shown, the central principle of torque limiter is ball 3, have one towards groove 1 Bottom land direction compresses thrust F of ball 3, and this thrust F can set a fixed value, at the tumbler 2 turns at groove 1 place Time dynamic, according to the difference of rotation direction, groove 1 is supported with ball 3 with one sidewall and is contacted, and this supports power at thrust F place The component in direction when being not more than F, ball 3 remains in groove 1, as shown in Figure 6；When this supports power at thrust F place The component in direction more than F time, compressing member 12 can be backed down, can outwards deviate from from groove 1, as shown in Figure 7 by ball 3.

Specifically, thrust F that abjection power F1 and ball 3 are subject to has corresponding relation, as in figure 2 it is shown, it is basic Reason is that ball 3 is different from the corner cut of groove 1, when ball 3 sinks in groove 1, and the two side that the axial cross section of groove 1 is corresponding Angle to axial so that ball 3 is different from the corner cut of two side.

In detail, in the groove 1 of V-type, the angle of two side illustrates as a example by being 90 degree.

As shown in Fig. 2 (a), it is generally the case that the two side of groove 1 is that the axis about groove 1 is symmetrically arranged, rolling Pearl 3 is 45 degree with the corner cut of groove 1 two side, and now, ball 3 is outwards deviate from the abjection moment of correspondence by the both sides of groove 1 Be equal, then corresponding torque limit value is the most equal.

But, in practice, for meeting special operation condition, it is necessary to ball 3 is big by the abjection moment that both direction abjection is corresponding Little, therefore, as shown in Fig. 2 (b) and Fig. 2 (c), it is 60 degree and ball with the wherein side of groove 1 angle to axial The corner cut of 3 is 60 degree, and opposite side angle to axial is as a example by the corner cut of 30 degree and ball 3 is 30 degree, to abjection power F1 illustrates.

By Fig. 2 (b) and Fig. 2 (c) it can be seen that abjection power F1=1.72F corresponding to 30 degree, the abjection corresponding to 60 degree Power F1=0.58F, thus realize forward (i.e. by rotation direction corresponding during the abjection of side that corner cut is 30 degree) and reverse (by Corresponding rotation direction when corner cut is the side abjection of 60 degree) moment that needs of abjection is different, corresponding torque limit value The most just.

Understand in conjunction with Fig. 4, the radius of the circumference being distributed with each ball 3 and groove 1 as R, then abjection power F1 and distribution diameter R Product deviate from moment exactly, i.e. corresponding torque limit value.

Wherein, the angle of inclination of groove 1 two side can adjust as required, is not limited to the most remaining above-mentioned relation, It is also not necessarily limited to the concrete angle of 60 degree and 30 degree, say, that the disengagement moment of both direction can control respectively.

It should be noted that due to circumferentially distributed at tumbler 2 of ball 3, quantity can be arranged as required to, Fig. 4 With Fig. 5 illustrate only four balls 3 and four grooves 1, for structure and the matching relationship of ball 3 and groove 1 are described, but It is to it will be understood by those skilled in the art that the circumference of tumbler 2 can arrange some grooves 1 and ball 3 as required, It is not limited to four provided in Fig. 4 and Fig. 5, and Fig. 4 and Fig. 5 is merely to illustrate, do not indicate that other parts cannot arrange ball 3 With groove 1.

As seen in figs. 8-10, present invention also offers a kind of suspension system, form equalising torque including around support shaft 6 Hanger 4 and balance force mechanisms 5, wherein, support shaft 6 connects driving source 7, and support shaft 6 specifically can be by above-mentioned moment of torsion Limiter 8 is connected with driving source 7；Now, the direction that torque limit value corresponding to torque limiter 8 is big is for limiting hanger 4 times The direction fallen, represents the direction with forward, then the forward of torque limiter 8 is to limit the direction that hanger 4 falls, i.e. with suspension The torque direction that support shaft 6 is applied by the gravity of thing 4 is contrary；With torque limit value corresponding to reverse presentation torque limiter 8 Little direction, then the torque direction that support shaft 6 is applied by reverse and hanger 4 the gravity of torque limiter 8 is in the same direction.

When equilibrant mechanism 5 breaks down, the equilibrant that i.e. equilibrant mechanism 5 is provided is less than the gravity of hanger 4, When causing hanger 4 to drop and hurt sb.'s feelings, the positive torque of torque limiter 8 can be configured so that torque limiter 8 Positive torque is more than unbalanced moments, so that avoiding hanger 4 to drop, improves the safety of suspension system.

If it occur that control out of control, hanger 4 continues downwards and likely or continues compressing and is in below hanger 4 When people or thing, operator needs to be lifted up hanger 4, now needs the power overcome to be the conjunction of reactive torque and friction torque Power, much smaller than making a concerted effort corresponding to unbalanced moments under equal conditions and moment of friction sum so that operator can more hold Easy lifts hanger 4.

Wherein, driving source 7 can be motor, specifically can be connected with torque limiter 8 by chain or transmission band etc., Then it is connected with support shaft 6 by torque limiter 8.The equilibrant that equilibrant mechanism 5 is provided can adjust as required, tool Body can be Spring balancer, to provide the equilibrant being available for regulation.

As shown in Figure 9 and Figure 10, this suspension system also includes the rope sheave 9 being sleeved on support shaft 6, and this rope sheave 9 is wound with Steel wire rope 10, steel wire rope 10 has the first end and the second end, and the first end is connected with hanger 4, and the second end is with equilibrant mechanism 5 even Connecing, the first end and the second end are respectively at the both sides of support shaft 6, in order to by steel wire rope 10, equilibrant is transferred to hanger 4, Hanger 4 and equilibrant mechanism 5 is made to form balance system around support shaft 6.

First end of steel wire rope 10 and the second end, only for distinguishing two different external parts, do not indicate that sequentially special Limit.

In a kind of detailed description of the invention, hanger 4 is bulb, and suspension system now is suspention DR system, i.e. suspends in midair Direct digital radiograph system.In another kind of detailed description of the invention, hanger 4 can also be mammary machine, hanging now Crane system forms the suspention mammary machine system that can limit mammary machine oppressive force.

It is understood that for being provided with the suspension system of hanger 4, the direction that torque limit value is little can be with outstanding The produced moment of torsion of gravity hanging thing 4 is arranged in the same direction, can reduce the difficulty promoting hanger 4；And the direction that limits value of twisting together is big Can with the gravity of hanger 4 produced moment of torsion oppositely arranged, to improve stability and the reliability of suspension system.Even It is, as long as different to the torque demand of both direction, all can to use the torque limiter 8 of the present invention, to take into account system simultaneously Reliability and difficulty during troubleshooting.

Hereinafter illustrate as a example by suspention DR system.

Assume the positive torque M1=20Nm of torque limiter 8, reactive torque M2=6.5Nm, bulb and balanced force structure Unbalanced moments M=11.5Nm, suspention DR system internal drag produce friction torque be M3=3Nm, M3 ＜ M2.

When equilibrant mechanism 5 breaks down, i.e. equilibrant is less than hanger 4 gravity, causes bulb to drop when hurting sb.'s feelings, by In the positive torque M1=20Nm of torque limiter 8, more than unbalanced moments M, even if then equilibrant mechanism 5 breaks down, ball Pipe does not falls out yet.

If it occur that control out of control, when bulb overwhelms patient downwards, operator needs to be lifted up bulb, now needs Power to be overcome is not more than power 204N that M2+M3 is corresponding, power 312N corresponding much smaller than M+M3 under equal conditions so that operator Be more prone to lifts bulb.

As shown in Figure 9 and Figure 10, when suspension system is for suspention DR system, it is also possible to retracting cylinder 11 is set, then by steel First end of cord 10 stretches in this retracting cylinder 11, and retracting cylinder 11 can also carry out flexible adjustment according to the length of steel wire rope 10, To obtain corresponding length；Steel wire rope 10 can be protected by retracting cylinder 11, it is also possible to avoids steel wire rope 10 to expose and affect Safety in utilization and reliability.

Above to torque limiter provided by the present invention and there is the suspension system of this torque limiter carried out detailed Jie Continue.Principle and the embodiment of the present invention are set forth by specific case used herein, and the explanation of above example is only It it is the core concept being adapted to assist in and understanding the present invention.It should be pointed out that, for those skilled in the art, not On the premise of departing from the principle of the invention, it is also possible to the present invention is carried out some improvement and modification, these improve and modification also falls into In the protection domain of the claims in the present invention.

Claims

1. a torque limiter, it is characterised in that include having the tumbler (2) of some grooves (1), rolling is connected to each institute State the ball (3) in groove (1), and each described ball (3) is pressed on the compressing member in corresponding described groove (1) (12), each described groove (1) is circumferentially distributed, and axial cross section is V-shaped, the two side of described groove (1) angle to axial , so that described tumbler (2) rotates clockwise and rotates counterclockwise corresponding torque limit value size in the circumferential ?.

2. torque limiter as claimed in claim 1, it is characterised in that incline the most to axial in the two side of described groove (1) Tiltedly, and about the asymmetric setting in axis of described groove (1)；

Or, in the two side of described groove (1), wherein a sidewall is axially extending, and another sidewall tilts to axial.

3. torque limiter as claimed in claim 1 or 2, it is characterised in that the thrust of described compressing member (12) is adjustable.

4. torque limiter as claimed in claim 3, it is characterised in that described compressing member (12) has and each described groove (1) corresponding ring compression face, interior to corresponding described groove (1) axially to compress each described ball (3).

5. torque limiter as claimed in claim 4, it is characterised in that the opening of each described groove (1) is in and is parallel to institute State in the same plane in ring compression face.

6. torque limiter as claimed in claim 4, it is characterised in that described compressing member (12) is for having described ring compression The disc spring in face, circumferentially distributed in described disc spring of each described groove (1).

7. torque limiter as claimed in claim 4, it is characterised in that described tumbler (2) is coaxial with described compressing member (12) Arrange is cylindric.

8. a suspension system, it is characterised in that include hanger (4) and the balance forming equalising torque around support shaft (6) Force mechanisms (5), described support shaft (6) connects driving source (7), and described support shaft (6) passes through any one of the claims 1-7 Described torque limiter (8) is connected with described driving source (7), and the high pulling torque direction of described torque limiter (8) is for limiting institute State the direction that hanger (4) falls.

9. suspension system as claimed in claim 8, it is characterised in that also include the rope sheave being sleeved on described support shaft (6) (9), described rope sheave (9) being wound with steel wire rope (10), described steel wire rope (10) has first be connected with described hanger (4) End and the second end being connected with described equilibrant mechanism (5), described first end and described second end are respectively at described support The both sides of axle (6).

10. suspension system as claimed in claim 8 or 9, it is characterised in that described hanger (4) is bulb, so that described Suspension system forms suspention DR direct digital radiograph system；Or, described hanger (4) is mammary machine, so that institute State suspension system and form the suspention mammary machine system that can limit mammary machine oppressive force.