CN106286639B - Torque limiter and suspension system with the torque limiter - Google Patents

Abstract

The present invention provides a kind of torque limiter and the suspension system with the torque limiter, it can ensure that hanger is not fallen at balance mechanism failure, and the active force that operator lifts hanger is reduced when uncontrolled movements occur, ensure the safety in utilization of suspension system.The torque limiter of the present invention includes the ball that there is the rotating member of several grooves and rolling to be connected in each groove, each groove is circumferentially distributed, and axial cross section is V-shaped, central axes asymmetric setting of the two side of V-type about the groove, so that the torque that the rotating member is rotated clockwise and rotated counterclockwise in the circumferential differs.The present invention also provides a kind of suspension systems, include the hanger and balance force mechanisms that equalising torque is formed around support shaft, the support shaft is connected with driving source, the support shaft is connected by above-mentioned torque limiter with the driving source, and the large torque direction of the torque limiter is the direction that the limitation hanger falls.

Description

Torque limiter and suspension system with the torque limiter

Technical field

The present invention relates to torque limit technical fields, more particularly to a kind of torque limiter and have the torque limiter Suspension system.

Background technology

DR systems, i.e. direct digital radiograph system, be by electronic cassette, scanning monitor, system controller, The compositions such as image display monitor central monitoring system are that x-ray photon is directly converted to digitized image by electronic cassette, are a kind of sensu lato straight Connect Digital X-ray Radiotive.According to rack construction, it is divided into suspention DR and column DR.

Referring to FIG. 1, Fig. 1 is to suspend the structural schematic diagram of DR systems in one embodiment in midair in the prior art.

As shown in Figure 1, in suspention DR systems, 1 ＇ of bulb is as hanger, with balance 2 ＇ of force mechanisms respectively 3 ＇'s of support shaft Both sides form equalising torque around 3 ＇ of support shaft；3 ＇ of support shaft and rope sheave 5 ＇ rotations are driven by 4 ＇ of motor, realizes 1 ＇'s of bulb Lifting.It is directly connected in 4 ＇ of motor and 3 ＇ of support shaft, or is connected by clutch.

It is when balance 2 ＇ of force mechanisms breaks down, i.e., flat in the embodiment that 4 ＇ of motor is directly connect with 3 ＇ of support shaft The power that weighs is smaller than hanger gravity, causes 1 ＇ of bulb to fall and hurt sb.'s feelings, passes through 4 ＇ of the motor holding torques of itself, it is also ensured that ball 1 ＇ of pipe is not fallen.The embodiment the problem is that, if it happens control it is out of control, when 1 ＇ of bulb overwhelms downwards always patient, 1 ＇ of bulb can not easily be lifted if even if powering off operator and patient is made to be detached from compressing.

In the embodiment that 4 ＇ of motor is connect by clutch with 3 ＇ of support shaft, when balance 2 ＇ of force mechanisms breaks down When, i.e., equilibrant force is smaller than hanger gravity, and 1 ＇ of bulb is caused to fall and hurt sb.'s feelings, if clutch is to be attracted, clutch torque It is greater than unbalanced moments, by taking unbalanced moments M >=11.5Nm as an example, corresponding out-of-balance force is 25kg, the out-of-balance force mistake Greatly so that clutch is difficult to overcome；If clutch is to disconnect, for example when power-off or manual movement, 1 ＇ of bulb will It falls, people may be hurt.

Above two embodiment all cannot simultaneously destroy equilibrant force and uncontrolled movements make reliable response.

Invention content

It, can be in balance mechanism the present invention provides a kind of torque limiter and with the suspension system of the torque limiter Ensure that hanger is not fallen when failure, and reduction operator lifts the active force of hanger when uncontrolled movements occur, ensures outstanding The safety in utilization of crane system.

In order to solve the above technical problems, a kind of torque limiter provided by the present invention, includes the rotation with several grooves Part and rolling are connected to the ball in each groove, and each ball is pressed on the compression in the corresponding groove Part, each groove is circumferentially distributed, and axial cross section is V-shaped, and the angle of the two side of the groove to axial differs, so that The rotating member rotates clockwise and rotates counterclockwise in the circumferential corresponding torque limit value and differs in size.

The torque limiter of the present invention, sets groove to V-structure, and the angle of the two side of V-type to axial is not Deng corresponding abjection torque is different when then ball is deviate from by the both sides of groove, and the abjection torque of wherein side is big, and the other side takes off Go out that torque is small, then corresponding torque limit value differs in size when rotating member is rotated clockwise and rotated counterclockwise so that two Rotation direction provides the torque limit value to differ in size, and can be suitable for that two rotation direction torque limit values is required not wait is System, meets the specific demand of the system, to assist the safety of raising system, meanwhile, when being rotated towards the direction of large torque, It can also assist saving manpower, improve simple operation.

Include the hanger and equilibrant force machine that equalising torque is formed around support shaft the present invention also provides a kind of suspension system Structure, the support shaft are connected with driving source, and the support shaft is connected by above-mentioned torque limiter with the driving source, described The large torque direction of torque limiter is the direction that the limitation hanger falls.

Since in torque limiter, big close to the axial corresponding abjection torque of one side wall abjection by groove, which corresponds to Deviate from the big direction of torque, then the direction can be arranged in the direction that limitation hanger falls；When event occurs for balanced force structure When barrier, the equilibrium state balanced between force mechanisms and hanger is broken, and there is the unbalanced moments that driving hanger falls, and Since the torque direction of rotating member in torque limiter at this time is in the direction that limitation hanger falls, to resist out-of-balance force Square avoids hanger from falling and hurt sb.'s feelings；When out of control, if hanger moves downward always and is possible to hurt sb.'s feelings, operator It needs to be lifted up hanger, it is only the sum of small torque and moment of friction of torque limiter to need the power overcome at this time, remote small Unbalanced moments under equal conditions so that operator more easily lifts hanger, improves simple operation and peace Quan Xing.

Description of the drawings

Fig. 1 is to suspend the structural schematic diagram of DR systems in one embodiment in midair in the prior art；

Fig. 2 is for the ball of the prior art and torque limiter provided by the present invention with groove in a kind of specific implementation mode In stress diagram；

Fig. 3 is the stereochemical structure sectional view of torque limiter provided by the present invention in a specific embodiment；

Fig. 4 is equipped with axis side structure schematic diagram when ball for the rotating member of torque limiter shown in Fig. 3；

Fig. 5 is the dimensional structure diagram of rotating member shown in Fig. 4；

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

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

Fig. 8 is the principle schematic of suspension system provided by the present invention 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：

1 ＇ of bulb, 2 ＇ of balance force mechanisms, 3 ＇ of support shaft, 4 ＇ of motor, 5 ＇ of rope sheave；

In Fig. 2-10：

Groove 1, rotating member 2, ball 3, hanger 4, balance force mechanisms 5, support shaft 6, driving 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.

Specific implementation mode

It, can be in balance mechanism the present invention provides a kind of torque limiter and with the suspension system of the torque limiter Ensure that hanger is not fallen when failure, and reduction operator lifts the active force of hanger when uncontrolled movements occur, ensures outstanding The safety in utilization of crane system.

Below in conjunction with attached drawing, the present invention is specifically introduced, so as to those skilled in the art accurate understanding present invention's Technical solution.

As illustrated in figs. 2-7, torque limiter of the invention includes having the rotating member 2 of several grooves 1 and rolling to connect Ball 3 in each groove 1, each groove 1 is circumferentially distributed, and the axial cross section of each groove 1 is V-shaped, the two side relative axle of the V-type To angle differ so that when rotating member 2 is rotated clockwise and rotated counterclockwise in the circumferential, the two side of groove 1 is to rolling The circumferential amount of force that pearl 3 applies differs, and then forms the torque limit value to differ in size.

Wherein, the two side of groove 1 could be provided as plane, so that groove 1 forms inverted triangular pyramid type；Or The two side of person, groove 1 can also be disposed as arc, so that groove 1 forms inverted pyramid type；Also or, groove 1 Different linear structures may be used in two side, and wherein side is plane, and the other side is arc.

Meanwhile the bottom of groove 1 can be plane or arc, to form the structure that slot bottom is cut；Alternatively, groove 1 Bottom can be intersected by two side made of vertex.

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

As described herein is in contrast, to be intended merely to distinguish two opposite rotation directions clockwise and anticlockwise.

Axial, circumferential direction and radial direction as described herein are defined with the arragement direction reference of groove 1, with each recessed The circular direction of slot 1 is circumferential, then the direction of the plane perpendicular to this where circumferential is axial, the plane where the circumferential direction It is interior, it is radial perpendicular to circumferential direction.

The torque limiter of the present invention, since the axial cross section of groove 1 is in the V-type not waited about axial angle so that Rotating member 2 rotate during, the two side of ball 3 and groove 1 is when contacting respectively, will produce the active force to differ in size, into And so that ball 3 deviates from required abjection torque by the both sides of groove 1 and differs in size outward, as shown in Figure 4 and Figure 5；When ball 3 Corresponding to smaller abjection torque when by deviating from outward far from axial side, illustrate the abjection difficulty smaller of ball 3 at this time, when turn When moving part 2 is rotated towards ball 3 by the direction that the side is deviate from, corresponding torque limit value is also with regard to smaller；Conversely, when ball 3 by The abjection torque that bigger is corresponded to when deviating from outward close to axial side, illustrates the abjection difficulty bigger of ball 3 at this time, works as rotation When part 2 is rotated towards ball 3 by the direction that the side is deviate from, corresponding torque limit value is also with regard to bigger.For purposes of illustration only, fixed herein When adopted ball 3 by deviating from outward close to axial side, the rotation direction of rotating member 2 is forward direction, otherwise be reversed, then forward direction Rotating torque is more than reversed rotating torque.

As it can be seen that in the torque limiter of the present invention, when rotating member 2 is rotated towards two different directions, corresponding torque Limits value differs in size, and disclosure satisfy that the not equal specific demand of both direction torque limit, and then suitable for a direction The operating mode that the demand of torque limit value is big, another direction torque limit value demand is small；On the one hand, torque limit value is needed Want big direction, big torque limit value that can assist realizing and carry, the stabilization and safety of system where improving torque limiter Property, on the other hand, for the small direction of torque limit value demand, the active force needed for hanger 4 is lifted when can reduce out of control, Improve property easy to use.

In a particular embodiment, the two side of groove 1 can be relatively axially inclined, at this time can be about groove 1 The asymmetric setting in central axes provide the torque limit that both direction differs in size to form angle of inclination not equal to axial Value processed, torque limiter at this time is double-direction twist moment limiter, and the torque limit value of only both direction differs in size.

Alternatively, in the two side of groove 1, wherein one side wall can extend in the axial direction, and another side wall tilts to axial Setting, at this point, ball 3 is by the close infinity of torque needed for axially extending side wall abjection so that ball 3 substantially can not possibly By the lateral outer abjection, then ball 3 is merely able to outward be deviate from by inclined another side wall, and torque limiter at this time is as unidirectional Torque limiter limits ball 3 and is deviate from outward by axially extending side wall, corresponding when rotating member 2 is rotated towards the direction Torque limit value is infinity；Conversely, when rotating member 2 is rotated towards another direction opposite with the direction, according to setting Torque limit value is deviate from.

On the basis of the above, the invention also includes the compressing members 12 being pressed on each ball 3 in corresponding groove 1.Each rolling Pearl 3 is inlaid in corresponding groove 1, and each groove 1 is circumferentially distributed, then compressing member 12 can be correspondingly arranged with each ball 3, and be in Axial one end of ball 3, to ball 3 apply axial pressing force, so as to by 3 axial compression of each ball in corresponding groove 1 It is interior.

There are certain relationships with abjection torque for the pressing force of ball 3, during rotating member 2 rotates, with its two side In wherein side active force is applied to ball 3, component of the active force in 3 axial direction of ball overcomes the pressing force of compressing member 12 When, ball 3 is possible to deviate from groove 1 outward along the side wall.

So, corresponding different operating mode, ball 3 just needs the pressing force for having different, so as to adapt to different operating modes Use demand, then compressing member 12 could be provided as the adjustable structure type of pressing force, such as holddown spring, tighten screw structure Form meets the use demand of different operating modes so that those skilled in the art adjust pressing force as needed.

In a kind of specific embodiment, compressing member 12 can have ring compression face, the ring compression face with it is each recessed The loop configuration that slot 1 surrounds is corresponding, the axial surface of 1 surrounded loop configuration of each groove is may be at, so that annular is pressed 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 It is interior.

Specifically, the compressing member 12 may include annular pressing plate 13, disc spring 14 and collet threaded circle 15, three is in groove 1 axial direction is set gradually, and collet threaded circle 15 is screwed onto axial one end of rotating member 2, and is compressed towards the direction where groove 1 Disc spring 14 so that disc spring 14 is axial to compress annular pressing plate 13, and annular pressing plate 13 forms ring compression away from the one side of disc spring 14 Face, it is corresponding with the loop configuration where each groove 1, so that each ball 3 is pressed in corresponding groove 1；At this point, each groove 1 in the circumferentially distributed of the annular pressing plate 13, can be to be uniformly distributed, as shown in Fig. 3,6 and Fig. 7.

Rotating member 2 can be cylindric to be coaxially disposed with compressing member 12, and groove 1 at this time is also in the week of the rotating member 2 To distribution, can also specifically equally distributed form be used to be arranged.

As shown in Fig. 2, the opening of each groove 1 may be in the same plane for being parallel to ring compression face, so as to each 3 uniformly applied pressing force of ball improves the compression reliability of ball 3, and then ensures the reliability service of torque limiter.And And the edge of 1 opening of groove is in same plane so that the depth that ball 3 is embedded in groove 1 is consistent so that groove 1 is to rolling The circumferential restraining force of pearl 3 generally maintains consistent, and then controls its dependent variable that ball 3 is deviate from, and becomes using the shape of groove 1 as unique Amount improves the controllability and control accuracy of abjection torque.

Specifically, in conjunction with Fig. 2 and Fig. 3, structure type and principle to the asymmetric setting in two side carry out specifically It is bright.

It is sunk in groove 1 as shown in Fig. 2, the central principle of torque limiter is ball 3, there are one towards groove 1 Slot bottom direction compresses the pressing force F of ball 3, and pressing force F can set a fixed value, 2 turns of the rotating member where groove 1 When dynamic, according to the difference of rotation direction, groove 1 is supported with ball 3 with one side wall and is contacted, this supports power where pressing force F Direction component be not more than F when, ball 3 remains in groove 1, as shown in Figure 6；When this supports power where pressing force F The component in direction when being more than F, ball 3 can be open-top by compressing member 12, can outward deviate from from groove 1, as shown in Figure 7.

Specifically, the pressing force F that abjection power F1 and ball 3 are subject to has correspondence, as shown in Fig. 2, it is basic The reason is that ball 3 is different from the corner cut of groove 1, and when ball 3 is sunk in groove 1, the corresponding two side of axial cross section of groove 1 Angle to axial differs so that ball 3 is different from the corner cut of two side.

In detail, it is illustrated so that the angle of two side in the groove of V-type 1 is 90 degree as an example.

As shown in Fig. 2 (a), it is generally the case that the two side of groove 1 be about groove 1 central axes it is symmetrically arranged, rolling Pearl 3 and the corner cut of 1 two side of groove are 45 degree, at this point, ball 3 deviates from corresponding abjection torque outward by the both sides of groove 1 It is equal, then corresponding torque limit value is also equal.

But in practice, to meet special operation condition, it is necessary to which it is big that ball 3 by both direction deviates from corresponding abjection torque It is small etc., it is 60 degree and ball with the angle of the wherein side of groove 1 to axial as shown in Fig. 2 (b) and Fig. 2 (c) therefore 3 corner cut is 60 degree, the angle of the other side to axial is 30 degree, with the corner cut of ball 3 be 30 degree for, to deviating from power F1 is illustrated.

30 degree of corresponding abjection power F1=1.72F, 60 degree of corresponding abjections it can be seen from Fig. 2 (b) and Fig. 2 (c) Power F1=0.58F, to realize positive (corresponding rotation direction when the side abjection that is 30 degree by corner cut) and reversely (i.e. by Corresponding rotation direction when the side abjection that corner cut is 60 degree) torque of abjection needs is different, corresponding torque limit value Also it just differs.

In conjunction with Fig. 4 it is found that the radius for the circumference being distributed with each ball 3 and groove 1 is R, then deviate from power F1 and distribution diameter R Product be exactly to deviate from torque, i.e., corresponding torque limit value.

Wherein, the angle of inclination of 1 two side of groove can adjust as needed, be not limited to above-mentioned mutual remaining relationship, It is also not necessarily limited to 60 degree and 30 degree of specific angle, that is to say, that the disengagement torque of both direction can control respectively.

It should be noted that since ball 3 is in the circumferentially distributed of rotating member 2, quantity can be arranged as required to, Fig. 4 With four balls 3 and four grooves 1 are illustrated only in Fig. 5, structure and matching relationship for illustrating ball 3 and groove 1, but It is, it will be understood by those skilled in the art that the circumferential direction of rotating member 2 can arrange several grooves 1 and ball 3 as needed, Provided in Fig. 4 and Fig. 5 four are not limited to, and Fig. 4 and Fig. 5 are merely to illustrate, do not indicate that ball 3 cannot be arranged in other parts With groove 1.

As seen in figs. 8-10, include forming equalising torque around support shaft 6 the present invention also provides a kind of suspension system Hanger 4 and balance force mechanisms 5, wherein support shaft 6 is connected with driving source 7, and support shaft 6 can specifically pass through above-mentioned torque Limiter 8 is connected with driving source 7；At this point, the big direction of torque limit value corresponding to torque limiter 8 is under limitation hanger 4 The direction fallen, with forward direction indicates the direction, then the forward direction of torque limiter 8 be limitation hanger 4 whereabouts direction, i.e., with suspension The torque direction that the gravity of object 4 applies support shaft 6 is opposite；With torque limit value corresponding to reverse presentation torque limiter 8 Small direction, the then torque direction that the gravity of the reversed and hanger 4 of torque limiter 8 applies support shaft 6 are in the same direction.

When balance force mechanisms 5 break down, i.e., the equilibrant force that balance force mechanisms 5 are provided is smaller than the gravity of hanger 4, When hanger 4 being caused to fall and hurt sb.'s feelings, the positive torque of torque limiter 8 can be configured so that torque limiter 8 Positive torque improves the safety of suspension system more than unbalanced moments so that hanger 4 is avoided to fall.

Out of control in case of controlling, hanger 4 continues to be possible to downwards or continue compressing in 4 lower section of hanger People or when object, operator needs to be lifted up hanger 4, and it is the conjunction of reactive torque and friction torque to need the power overcome at this time Power, much smaller than the resultant force corresponding to the sum of unbalanced moments and moment of friction under equal conditions so that operator can more hold Easy lifts hanger 4.

Wherein, driving source 7 can be motor, can specifically be connect with torque limiter 8 by chain or transmission belt etc., Then it is connect with support shaft 6 by torque limiter 8.The equilibrant force that balance force mechanisms 5 are provided can adjust as needed, have Body can be Spring balancer, to provide the equilibrant force for adjusting.

As shown in Figure 9 and Figure 10, which further includes being sleeved on the rope sheave 9 of support shaft 6, is wound on the rope sheave 9 Steel wire rope 10, steel wire rope 10 have a first end and a second end, and first end is connect with hanger 4, and second end connects with balance force mechanisms 5 It connecing, first end and second end is respectively at the both sides of support shaft 6, and equilibrant force is transferred to hanger 4 will pass through steel wire rope 10, So that hanger 4 forms balance system with balance force mechanisms 5 around support shaft 6.

The first end and second end of steel wire rope 10 does not indicate that only for distinguishing two different external parts to the special of sequence It limits.

In a specific embodiment, hanger 4 is bulb, and suspension system at this time is suspention DR systems, that is, is suspended in midair Direct digital radiograph system.In another embodiment specific implementation mode, hanger 4 can also be mammary machine, at this time outstanding Crane system forms the suspention mammary machine system that can limit mammary machine oppressive force.

It is understood that for the suspension system equipped with hanger 4, the small direction of torque limit value can with it is outstanding Torque is arranged in the same direction produced by hanging the gravity of object 4, can reduce the difficulty for promoting hanger 4；And the direction that limits value of twisting together is big Can torque produced by the gravity with hanger 4 it is oppositely arranged, to improve the stability and reliability of suspension system.Even It is that, as long as the torque demand to both direction is different, the torque limiter 8 of the present invention may be used, to take into account system simultaneously Reliability and difficulty when troubleshooting.

It is illustrated for suspention DR systems below.

Assuming that 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 systems internal drag generate friction torque be M3=3Nm, M3 ＜ M2.

When balancing force mechanisms 5 and breaking down, i.e. equilibrant force is smaller than 4 gravity of hanger, when causing bulb to fall to hurt sb.'s feelings, by In the positive torque M1=20Nm of torque limiter 8, it is more than unbalanced moments M, even if then balance force mechanisms 5 break down, ball Pipe will not be fallen.

Out of control in case of controlling, when bulb overwhelms downwards always patient, operator needs to be lifted up bulb, needs at this time The power to be overcome is not more than the corresponding power 204N of M2+M3, much smaller than the corresponding power 312N of M+M3 under equal conditions so that operator What is be more prone to lifts bulb.

As shown in Figure 9 and Figure 10, when suspension system is suspention DR systems, retracting cylinder 11 can also be set, then by steel The first end of cord 10 stretches into the 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；Retracting cylinder 11 can protect steel wire rope 10, and steel wire rope 10 can also be avoided exposed and influenced Safety in utilization and reliability.

The suspension system to torque limiter provided by the present invention and with the torque limiter has carried out detailed Jie above It continues.Principle and implementation of the present invention are described for specific case used herein, and the explanation of above example is only It is to be used to help understand core of the invention thought.It should be pointed out that for those skilled in the art, not , can be with several improvements and modifications are made to the present invention under the premise of being detached from the principle of the invention, these improvement and modification are also fallen into In the protection domain of the claims in the present invention.

Claims (10)

1. a kind of torque limiter, which is characterized in that include rotating member (2) with several grooves (1), roll and be connected to each institute The ball (3) in groove (1) is stated, and each ball (3) is pressed on the compressing member in the corresponding groove (1) (12), the circumferentially-spaced distribution of each groove (1), and axial cross section is V-shaped, the two side of the groove (1) is to axial Angle etc., so that the rotating member (2) rotates clockwise and rotate counterclockwise in the circumferential corresponding torque limit value It differs in size.

2. torque limiter as described in claim 1, which is characterized in that incline to axial the two side of the groove (1) Tiltedly, and about the asymmetric setting in central axes of the groove (1)；

Alternatively, in the two side of the groove (1), wherein one side wall is axially extending, and another side wall tilts to axial.

3. torque limiter as claimed in claim 1 or 2, which is characterized in that the pressing force of the compressing member (12) is adjustable.

4. torque limiter as claimed in claim 3, which is characterized in that the compressing member (12) has and each groove (1) corresponding ring compression face is compressed with axial in each ball (3) to the corresponding groove (1).

5. torque limiter as claimed in claim 4, which is characterized in that the opening of each groove (1) is in and is parallel to institute In the same plane for stating ring compression face.

6. torque limiter as claimed in claim 4, which is characterized in that the compressing member (12) is with the ring compression The disc spring in face, each groove (1) is in the circumferentially distributed of the disc spring.

7. torque limiter as claimed in claim 4, which is characterized in that the rotating member (2) is coaxial with the compressing member (12) What is be arranged is cylindric.

8. a kind of suspension system, which is characterized in that form the hanger (4) and balance of equalising torque including surrounding support shaft (6) Force mechanisms (5), the support shaft (6) are connected with driving source (7), and the support shaft (6) passes through any one of the claims 1-7 The torque limiter (8) is connected with the driving source (7), and the large torque direction of the torque limiter (8) is limitation institute State the direction of hanger (4) whereabouts.

9. suspension system as claimed in claim 8, which is characterized in that further include the rope sheave for being sleeved on the support shaft (6) (9), steel wire rope (10) is wound on the rope sheave (9), the steel wire rope (10) has first connect with the hanger (4) End and the second end being connect with the balance force mechanisms (5), the first end and the second end are respectively at the support The both sides of axis (6).

10. suspension system as claimed in claim 8 or 9, which is characterized in that the hanger (4) is bulb, so that described Suspension system forms suspention DR direct digital radiograph systems；Alternatively, the hanger (4) is mammary machine, so that institute It states suspension system and forms the suspention mammary machine system that can limit mammary machine oppressive force.