阅读说明：本技术 一种渐进式滚子离心制动器 (Progressive roller centrifugal brake ) 是由 金徐凯 许玉凯 于 2019-12-23 设计创作，主要内容包括：本发明公开了一种渐进式滚子离心制动器,包括壳体以及转轴,壳体内设置有轴套,转轴上设置有能够在离心力的作用下驱动轴套转动的离心机构、以及对轴套进行轴向限位的制动机构,离心机构包括离心圆台、滚子以及弹性件,离心圆台设置有与滚子相配合的弧形滑槽；初始时,滚子在弹性件的作用下位于弧形滑槽的起端；制动时,滚子在离心力的作用下,逐渐向弧形滑槽的终端移动,直至滚子与轴套相抵接,轴套随同转轴转动并向制动机构的方向移动,直至转轴停止转动,以实现制动。本发明的渐进式滚子离心制动器不仅结构紧凑、体积小巧,而且采用渐进式的制动,使得制动器的制动更加平稳均衡,提高了结构的可靠性和使用寿命。(The invention discloses a progressive roller centrifugal brake, which comprises a shell and a rotating shaft, wherein a shaft sleeve is arranged in the shell, a centrifugal mechanism capable of driving the shaft sleeve to rotate under the action of centrifugal force and a braking mechanism for axially limiting the shaft sleeve are arranged on the rotating shaft, the centrifugal mechanism comprises a centrifugal circular table, a roller and an elastic piece, and the centrifugal circular table is provided with an arc-shaped sliding groove matched with the roller; initially, the roller is positioned at the starting end of the arc-shaped sliding groove under the action of the elastic piece; during braking, the roller gradually moves towards the terminal of the arc-shaped sliding groove under the action of centrifugal force until the roller is abutted against the shaft sleeve, and the shaft sleeve rotates along with the rotating shaft and moves towards the direction of the braking mechanism until the rotating shaft stops rotating, so that braking is realized. The progressive roller centrifugal brake has the advantages of compact structure and small volume, and adopts progressive braking, so that the braking of the brake is more stable and balanced, the reliability of the structure is improved, and the service life is prolonged.)

1. A progressive roller centrifugal brake, includes the casing and sets up in pivot in the casing, its characterized in that: the centrifugal mechanism comprises a centrifugal round platform which is fixedly arranged on the rotating shaft and is in clearance fit with the shaft sleeve, a roller which is arranged between the centrifugal round platform and the shaft sleeve and is in sliding connection with the centrifugal round platform, and an elastic piece which is arranged between the roller and the centrifugal round platform, the outer peripheral surface of the centrifugal round platform is provided with an arc-shaped chute matched with the roller along the circumferential direction of the outer peripheral surface, and the depth of the arc-shaped chute from the starting end to the terminal end is gradually reduced; initially, the roller is positioned at the starting end of the arc-shaped sliding chute under the action of the elastic piece; during braking, the roller gradually moves towards the terminal of the arc-shaped sliding groove under the action of centrifugal force until the roller is abutted against the inner side face of the shaft sleeve, and the shaft sleeve rotates along with the rotating shaft and moves towards the direction of the braking mechanism relative to the shell until the rotating shaft stops rotating due to braking force generated by the braking mechanism, so that braking is realized.

2. The progressive roller centrifugal brake of claim 1, wherein: the roller comprises a roller shaft and a roller body arranged on the roller shaft, the groove depth of the starting end of the arc-shaped sliding groove is larger than the diameter of the roller body, and the groove depth of the terminal end of the arc-shaped sliding groove is smaller than the diameter of the roller body.

3. The progressive roller centrifugal brake of claim 2, wherein when said rollers are in contact with both the bottom surface of said arcuate groove and the inner surface of said sleeve, a tangent to said inner surface of said sleeve is defined as M, a tangent to said bottom surface of said arcuate groove is defined as N, and an angle formed by said M and said N is α and 2 ° < α < 4 °.

4. The progressive roller centrifugal brake of claim 2, wherein: the centrifugal round platform is in the both ends of roller body all are provided with the apron, the apron be provided with roller bearing matched with guide way, the position of guide way with the position of arc spout is corresponding, the guide way from the start end to the terminal with the distance between the axis of centrifugal round platform increases gradually.

5. The progressive roller centrifugal brake of claim 1, wherein: the braking mechanism comprises a sliding sleeve connected with the rotating shaft in a sliding mode and an annular spring arranged between the sliding sleeve and the shaft sleeve and sleeved with the sliding sleeve and the shaft sleeve.

6. The progressive roller centrifugal brake of claim 5, wherein: the annular spring is formed by sequentially sleeving a plurality of inner circular rings with outer conical surfaces and a plurality of outer circular rings with inner conical surfaces, and conical surfaces matched with the outer conical surfaces are arranged on the inner side surface of the sliding sleeve and the inner side surface of the shaft sleeve.

7. The progressive roller centrifugal brake of claim 6 wherein the cone angle of said conical surface is equal to the cone angle of said external conical surface, said external conical surface having a cone angle of β, 7 ° ≦ β ≦ 30 °.

8. The progressive roller centrifugal brake of claim 6, wherein: the sliding sleeve with be provided with the direction subassembly between the casing, the direction subassembly includes a plurality of edges the guide bar of the circumference equipartition of sliding sleeve.

9. The progressive roller centrifugal brake of claim 8, wherein: a supporting part used for fixing the guide rod is arranged at the end part of the shell, and a pre-tightening spring is arranged between the sliding sleeve and the supporting part; initially, the sliding sleeve is tightly matched with the annular spring under the acting force of the pre-tightening spring; during braking, the annular spring drives the sliding sleeve to move under the axial force of the shaft sleeve and compresses the pre-tightening spring until the rotating shaft stops rotating due to the circumferential friction force generated by the outer conical surface of the annular spring under the twisting force of the shaft sleeve, so that braking is realized.

10. The progressive roller centrifugal brake of claim 1, wherein: and a sensor is arranged at one end, close to the braking mechanism, of the shaft sleeve in the shell and is connected with a control system.

Technical Field

The invention relates to the technical field of brakes, in particular to a progressive roller centrifugal brake.

Background

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a progressive roller centrifugal brake which is compact in structure and small in size, adopts progressive braking, enables braking of the brake to be more stable and balanced, and improves reliability of the structure and service life.

The invention is realized by adopting the following technical scheme:

a progressive roller centrifugal brake comprises a shell and a rotating shaft arranged in the shell, wherein a shaft sleeve in threaded connection with the shell is arranged in the shell, a centrifugal mechanism which can be matched with the shaft sleeve under the action of centrifugal force to drive the shaft sleeve to rotate and a braking mechanism which can axially limit the shaft sleeve to realize braking are arranged on the rotating shaft, the centrifugal mechanism comprises a centrifugal round table which is fixedly arranged on the rotating shaft and is in clearance fit with the shaft sleeve, a roller which is arranged between the centrifugal round table and the shaft sleeve and is in sliding connection with the centrifugal round table and an elastic piece which is arranged between the roller and the centrifugal round table, an arc-shaped chute which is matched with the roller is arranged on the outer circumferential surface of the centrifugal round table along the circumferential direction of the outer circumferential surface; initially, the roller is positioned at the starting end of the arc-shaped sliding groove under the action of the elastic piece; during braking, the roller gradually moves towards the terminal of the arc-shaped sliding groove under the action of centrifugal force until the roller is abutted against the inner side face of the shaft sleeve, and the shaft sleeve rotates along with the rotating shaft and moves towards the direction of the braking mechanism relative to the shell until the rotating shaft stops rotating by braking force generated by the braking mechanism, so that braking is realized.

Further, the roller comprises a roller shaft and a roller body arranged on the roller shaft, the groove depth of the starting end of the arc-shaped sliding groove is larger than the diameter of the roller body, and the groove depth of the terminal end of the arc-shaped sliding groove is smaller than the diameter of the roller body.

Further, when the roller body is abutted against the bottom surface of the arc-shaped chute and the inner side surface of the shaft sleeve, the tangent line of the roller body and the inner side surface of the shaft sleeve is set as an M line, the tangent line of the roller body and the bottom surface of the arc-shaped chute is set as an N line, and the included angle between the M line and the N line is α, 2 degrees is more than or equal to α and less than or equal to 4 degrees, preferably α can be 2 degrees, 2.2 degrees, 2.4 degrees, 2.6 degrees, 2.8 degrees, 3.0 degrees, 3.2 degrees, 3.4 degrees, 3.6 degrees, 3.8 degrees, 4.0 degrees and the like.

Furthermore, the centrifugal round platform is provided with cover plates at two ends of the roller body, the cover plates are provided with guide grooves matched with the roller, the positions of the guide grooves correspond to those of the arc-shaped sliding grooves, and the distance between the starting end of each guide groove and the axis of the centrifugal round platform and the terminal end of each guide groove is gradually increased.

Furthermore, both ends of the roller are provided with elastic pieces, one end of each elastic piece is fixed on the centrifugal circular truncated cone, and the other end of each elastic piece is fixed on the roller.

Furthermore, the number of the rollers and the number of the arc-shaped sliding grooves are four, and the four groups of rollers are uniformly arranged along the circumferential direction of the centrifugal circular truncated cone.

Furthermore, the braking mechanism comprises a sliding sleeve connected with the rotating shaft in a sliding manner, and an annular spring arranged between the sliding sleeve and the shaft sleeve and sleeved with the sliding sleeve and the shaft sleeve.

Furthermore, the annular spring is formed by sequentially sleeving a plurality of inner circular rings with outer conical surfaces and a plurality of outer circular rings with inner conical surfaces, and conical surfaces matched with the outer conical surfaces are arranged on the inner side surface of the sliding sleeve and the inner side surface of the shaft sleeve.

Further, the taper angle of the conical surface is equal to that of the outer conical surface, the taper angle of the outer conical surface is β, 7 ° - β ° -30 °, preferably β is 7 °, 10 °, 12 °, 15 °, 18 °, 20 °, 22 °, 25 °, 28 °, 30 °, etc.

Furthermore, the friction coefficient of the outer conical surface is 0.12-0.16. Preferably, the coefficient of friction of the outer conical surface is 0.12, 0.13, 0.14, 0.15, 0.16, etc.

Further, be provided with the direction subassembly between slip cover and the casing, the direction subassembly includes a plurality of guide bars of the circumference equipartition along the slip cover.

Furthermore, a supporting part for fixing the guide rod is arranged at the end part of the shell, and a pre-tightening spring is arranged between the sliding sleeve and the supporting part; initially, the sliding sleeve is tightly matched with the annular spring under the acting force of the pre-tightening spring; during braking, the annular spring drives the sliding sleeve to move under the axial force of the shaft sleeve and compresses the pre-tightening spring until the rotating shaft stops rotating due to the circumferential friction force generated by the outer conical surface of the annular spring under the torsional force of the shaft sleeve, so that braking is realized.

Further, a sensor is arranged at one end, close to the braking mechanism, of the shaft sleeve in the shell, and the sensor is connected with the control system.

Compared with the prior art, the invention has the beneficial effects that:

the centrifugal mechanism comprises a centrifugal round platform which is fixedly arranged on the rotating shaft and is in clearance fit with the shaft sleeve, a roller which is arranged between the centrifugal round platform and the shaft sleeve and is in sliding connection with the centrifugal round platform, and an elastic piece which is arranged between the roller and the centrifugal round platform, wherein the peripheral surface of the centrifugal round platform is provided with an arc-shaped chute matched with the roller along the circumferential direction of the peripheral surface, and the depth of the arc-shaped chute from a starting end to a terminal is gradually reduced by a technical means, so that the roller is positioned at the starting end of the arc-shaped chute under the action of the elastic piece at the beginning; during braking, the roller gradually moves towards the terminal of the arc-shaped sliding groove under the action of centrifugal force until the roller is abutted against the inner side surface of the shaft sleeve, the shaft sleeve rotates along with the rotating shaft and moves towards the braking mechanism relative to the shell until the braking force generated by the braking mechanism stops the rotating shaft to realize braking, in the process, the movement of the shaft sleeve relative to the shell towards the braking mechanism is gradual, the braking on the rotating shaft is gradual, so that the braking of the brake is more stable and balanced, and the danger caused by emergency braking is avoided, in addition, the centrifugal mode of the centrifugal circular table and the roller is adopted, the outer diameter is smaller, the structure is simple, the size is small, the contact surface between the roller and the shaft sleeve is larger, the linkage between the roller and the shaft sleeve is more reliable, the service life of the roller is longer, and the influence on the service life of the structure caused by the abrasion of a centrifugal part, the reliability of the structure is improved.

Drawings

FIG. 1 is an exploded perspective view of a progressive roller centrifugal brake according to an embodiment of the present invention;

FIG. 2 is a perspective view of a progressive roller centrifugal brake according to an embodiment of the present invention;

FIG. 3 is a front view of a progressive roller centrifugal brake of an embodiment of the present invention;

FIG. 4 is a left side view of a progressive roller centrifugal brake of an embodiment of the present invention;

FIG. 5 is a cross-sectional view of the progressive roller centrifugal brake of FIG. 4 initially at section CC;

FIG. 6 is a cross-sectional view at section CC of the progressive roller centrifugal brake of FIG. 4 during braking;

FIG. 7 is a cross-sectional view of the progressive roller centrifugal brake of FIG. 3 initially taken at section AA;

FIG. 8 is a cross-sectional view at section AA of the progressive roller centrifugal brake of FIG. 3 during braking;

FIG. 9 is a cross-sectional view of the progressive roller centrifugal brake of FIG. 3 initially at section BB;

FIG. 10 is a cross-sectional view at BB of the progressive roller centrifugal brake of FIG. 3 during braking;

FIG. 11 is a schematic diagram of the combination of the roller body, the centrifugal round table and the shaft sleeve according to the embodiment of the present invention;

FIG. 12 is a schematic structural view of a ring spring according to an embodiment of the present invention;

FIG. 13 is a perspective view of a centrifugal mechanism according to an embodiment of the present disclosure;

FIG. 14 is an exploded view of a centrifugal mechanism according to an embodiment of the invention.

In the figure: 10. a housing; 11. a support portion; 20. a rotating shaft; 30. a shaft sleeve; 40. a centrifugal mechanism; 41. a centrifugal circular table; 411. an arc-shaped chute; 42. a roller; 421. a roller; 422. rolling the body; 43. an elastic member; 44. a cover plate; 441. a guide groove; 50. a brake mechanism; 51. a sliding sleeve; 52. an annular spring; 521. an inner circular ring; 522. an outer ring; 53. a guide bar; 54. pre-tightening the spring; 60. a sensor.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

The progressive roller centrifugal brake as shown in fig. 1 to 14 includes a housing 10 and a rotating shaft 20 disposed in the housing 10, wherein a shaft sleeve 30 is disposed in the housing 10, the rotating shaft 20 is provided with a centrifugal mechanism 40 capable of cooperating with the shaft sleeve 30 under the action of centrifugal force to drive the shaft sleeve 30 to rotate, and a braking mechanism 50 for axially limiting the shaft sleeve 30 to achieve braking, the centrifugal mechanism 40 includes a centrifugal circular table 41 fixed on the rotating shaft 20 and in clearance fit with the shaft sleeve 30, a roller 42 disposed between the centrifugal circular table 41 and the shaft sleeve 30 and slidably connected with the centrifugal circular table 41, and an elastic member 43 disposed between the roller 42 and the centrifugal circular table 41, an arc-shaped chute 411 is disposed on an outer circumferential surface of the centrifugal circular table 41 along a circumferential direction thereof and in cooperation with the roller 42, and a depth of the arc-shaped chute 411 from a beginning end to a terminal end is; initially, the roller 42 is located at the start end of the arc chute 411 under the action of the elastic member 43; during braking, the roller 42 gradually moves towards the terminal of the arc-shaped sliding slot 411 under the action of centrifugal force until the roller 42 abuts against the inner side surface of the shaft sleeve 30, the shaft sleeve 30 rotates along with the rotating shaft 20 and moves towards the braking mechanism 50 relative to the housing 10 until the braking force generated by the braking mechanism 50 stops the rotating shaft 20, so as to achieve braking.

The technical means that the shaft sleeve 30 in threaded connection with the housing 10 is arranged in the housing 10, the rotating shaft 20 is provided with the centrifugal mechanism 40 which can be matched with the shaft sleeve 30 under the action of centrifugal force to drive the shaft sleeve 30 to rotate, and the braking mechanism 50 which axially limits the shaft sleeve 30 to realize braking is arranged on the rotating shaft 20, the centrifugal mechanism 40 comprises a centrifugal circular truncated cone 41 which is fixedly arranged on the rotating shaft 20 and is in clearance fit with the shaft sleeve 30, a roller 42 which is arranged between the centrifugal circular truncated cone 41 and the shaft sleeve 30 and is in sliding connection with the centrifugal circular truncated cone 41, and an elastic piece 43 which is arranged between the roller 42 and the centrifugal circular truncated cone 41, the outer peripheral surface of the centrifugal circular truncated cone 41 is provided with an arc-shaped chute 411 which is matched with the roller 42 along the circumferential direction, and the groove depth of the arc-shaped chute 411 from the starting end to; during braking, the roller 42 gradually moves towards the terminal of the arc-shaped sliding groove 411 under the action of centrifugal force until the roller 42 abuts against the inner side surface of the shaft sleeve 30, the shaft sleeve 30 rotates along with the rotating shaft 20 and moves towards the braking mechanism 50 relative to the shell 10 until the braking force generated by the braking mechanism 50 stops the rotating shaft 20 to realize braking, in the process, the movement of the shaft sleeve 30 relative to the shell 10 towards the braking mechanism 50 is gradual, the braking on the rotating shaft 20 is also gradual, so that the braking of the brake is more stable and balanced, and the danger caused by emergency braking is avoided, in addition, the centrifugal mode of the centrifugal circular table 41 and the roller 42 is adopted, the outer diameter is smaller, the structure is simple, the size is small, the contact surface between the roller 42 and the shaft sleeve 30 is larger, the linkage between the roller 42 and the shaft sleeve 30 is more reliable, and the service life of the roller 42 is longer, the service life of the structure is prevented from being influenced by the abrasion of the centrifugal part, and the reliability of the structure is improved.

The embodiment is described by taking unidirectional braking as an example, namely, the braking mechanism 50 is arranged on one side of the shaft sleeve 30, and the centrifugal mechanism 40 is unidirectional centrifugal. In other embodiments, the braking mechanism 50 may be disposed on both sides of the shaft sleeve 30 to achieve bidirectional braking, and the centrifugal mechanisms 40 may be disposed in two groups to achieve bidirectional linkage with the shaft sleeve 30. In a preferred embodiment, the roller 42 includes a roller 421 and a roller 422 disposed on the roller 421, the starting end of the arc chute 411 has a groove depth greater than the diameter of the roller 422, and the terminal end of the arc chute 411 has a groove depth less than the diameter of the roller 422. Because the groove depth of the starting end is greater than the diameter of the roller 422, the roller 422 and the shaft sleeve 30 are arranged at intervals, the groove depth of the arc chute 411 is gradually reduced in the process that the roller 422 moves from the starting end of the arc chute 411 to the terminal end of the arc chute 411 under the action of centrifugal force, when the roller 422 moves to the position where the groove depth is equal to the diameter of the roller 422, the roller 422 is abutted against the inner side surface of the shaft sleeve 30, the centrifugal force is further increased, under the action of the friction force, the roller 422 and the centrifugal circular table 41 are clamped and rotate along with the centrifugal circular table 41, the shaft sleeve 30 is driven to rotate together, and the shaft sleeve 30 moves towards the direction of the brake mechanism 50 relative to the shell 10 while rotating.

As shown in fig. 11, when the roller 422 abuts against the bottom surface of the arc chute 411 and the inner side surface of the shaft sleeve 30, a tangent line between the roller 422 and the inner side surface of the shaft sleeve 30 is defined as an M-line, a tangent line between the roller 422 and the bottom surface of the arc chute 411 is defined as an N-line, an included angle between the M-line and the N-line is defined as α, and 2 ° - α ≦ 4 °, and when the roller 422 abuts against the bottom surface of the arc chute 411 and the inner side surface of the shaft sleeve 30, a diameter of the roller 422 is equal to a groove depth of the arc chute 411, and 2 ° - α ≦ 4 °, so that a large frictional force can be formed between the roller 422 and the shaft sleeve 30, and self-locking of the roller 422 can be realized, and slipping of the roller 422 is avoided, and interlocking between the roller 422 and the shaft sleeve 30 is realized.

As a preferred embodiment, as shown in fig. 13 and 14, the centrifugal round table 41 is provided with cover plates 44 at both ends of the roller 422, the cover plates 44 are provided with guide grooves 441 engaged with the rollers 421, the positions of the guide grooves 441 correspond to the positions of the arc-shaped sliding grooves 411, and the distance between the guide grooves 441 and the axis of the centrifugal round table 41 from the starting end to the ending end gradually increases. The roller 421 can move from the start end to the end of the guide groove 441 by the centrifugal force, and drives the roller 422 of the roller 421 to move together. The arrangement of the cover plate 44 plays an axial limiting role on the roller body 422, and prevents the roller body 422 from moving axially.

As a preferred embodiment, as shown in fig. 13 and 14, elastic members 43 are provided at both ends of the roller 42, one end of each elastic member 43 is fixed to the centrifugal round table 41, and the other end of each elastic member 43 is fixed to the roller 421. The elastic member 43 is arranged to perform a resetting function on the roller 42, when the roller 42 moves from the starting end to the terminal end of the arc-shaped sliding groove 411 under the action of centrifugal force, the elastic force of the elastic member 43 needs to be overcome, the rotating speed of the rotating shaft 20 for starting braking depends on the elastic force of the elastic member 43 and the centrifugal force applied to the roller 42, and under different conditions, the proper elastic member 43 can be selected according to requirements.

As a preferred embodiment, as shown in fig. 13, the number of the rollers 42 and the arc-shaped sliding grooves 411 is four, and the four sets of rollers 42 are uniformly arranged along the circumferential direction of the centrifugal circular table 41, so that the friction force between the rollers 42 and the shaft sleeve 30 is larger during braking, and the reliability of the structure is improved. In other embodiments, other numbers of rollers 42 may be provided as desired.

As shown in fig. 1, 5 and 6, the brake mechanism 50 preferably includes a sliding sleeve 51 slidably connected to the rotating shaft 20, and an annular spring 52 disposed between and fitted to the sliding sleeve 51 and the sleeve 30. The annular spring 52 is formed by sequentially sleeving a plurality of inner circular rings 521 with outer conical surfaces and a plurality of outer circular rings 522 with inner conical surfaces, and the inner side surfaces of the sliding sleeve 51 and the shaft sleeve 30 are provided with conical surfaces matched with the outer conical surfaces.

The annular spring 52 is applied to the occasions with limited space and needing elastic force buffering, and the number of pairs of the outer rings 522 is determined according to the size of the borne load and the requirement of deformation. The ring spring 52 is composed of a plurality of pairs of inner rings 521 and outer rings 522, and if the ring spring is damaged or abraded, the ring spring does not need to be completely replaced, only individual scrapped rings need to be replaced, and the ring spring is easy to repair and economical. The contact surfaces have a large frictional force due to the relative sliding of the outer and inner rings 522, 521 along the mating cone. The annular spring 52 is made of a high-friction spring steel, has a tapered cross section, can bear a large axial load, and can generate a large friction force even when rotating in the circumferential direction.

During braking, the shaft sleeve 30 moves towards the annular spring 52 relative to the housing 10 while rotating, the axial force and the torsional force of the shaft sleeve 30 on the annular spring 52 are gradually increased, and the friction force between the inner ring 521 and the outer ring 522 of the annular spring 52, between the annular spring 52 and the shaft sleeve 30, and between the annular spring 52 and the sliding sleeve 51 is gradually increased until the rotating shaft 20 stops rotating, so as to realize braking. The setting of annular spring 52 not only makes the braking more reliable, and small in size moreover for the whole external diameter and the length of stopper are less, and the external diameter can be controlled within 180mm, has realized the miniaturization of stopper.

As a preferred embodiment, as shown in FIGS. 5, 6 and 12, the taper angle of the tapered surface is equal to the taper angle of the outer conical surface set to β, 7 ° ≦ β ≦ 30 °, which can prevent the ring spring 52 from self-locking, preferably β is 7 °, 10 °, 12 °, 15 °, 18 °, 20 °, 22 °, 25 °, 28 °, 30 °, etc. in this embodiment, β is 12 °, in other embodiments, β may be other values such as 7 °, 10 °, 15 °, 18 °, 20 °, 22 °, 25 °, 28 °, 30 °.

In a preferred embodiment, the coefficient of friction of the outer conical surface is 0.12 to 0.16. Preferably, the coefficient of friction of the outer conical surface is 0.12, 0.13, 0.14, 0.15, 0.16, etc. Different coefficients of friction may be selected depending on braking requirements. In this embodiment, the friction coefficient of the outer conical surface is 0.12. In other embodiments, the coefficient of friction of the outer conical surface may also be 0.13, 0.14, 0.15, 0.16, or other values.

As a preferred embodiment, as shown in fig. 1, 5 and 6, a guide assembly is provided between the sliding sleeve 51 and the housing 10, and the guide assembly includes a plurality of guide rods 53 uniformly distributed along the circumferential direction of the sliding sleeve 51. The guide rod 53 is provided to guide the sliding sleeve 51 while preventing the sliding sleeve 51 from rotating, so as to ensure that a sufficient frictional force is generated in the circumferential direction of the annular spring 52.

As a preferred embodiment, as shown in fig. 1, 5 and 6, a support portion 11 for fixing a guide rod 53 is provided at an end portion of the housing 10, and a pre-tightening spring 54 is provided between the sliding sleeve 51 and the support portion 11; initially, the sliding sleeve 51 is tightly matched with the annular spring 52 under the action of the pre-tightening spring 54 so as to prevent the problem that the annular spring 52 is not concentric in a normal state; during braking, the annular spring 52 drives the sliding sleeve 51 to move under the axial force of the shaft sleeve 30 and compresses the pre-tightening spring 54 until the circumferential friction force generated by the outer conical surface of the annular spring 52 under the twisting force of the shaft sleeve 30 stops the rotation of the rotating shaft 20, so as to realize braking.

As a preferred embodiment, as shown in fig. 1, 5 and 6, a sensor 60 is provided in the housing 10 at an end of the shaft sleeve 30 adjacent to the brake mechanism 50, and the sensor 60 is connected to the control system. When the shaft sleeve 30 moves relative to the shell 10, the sensor 60 is triggered, and the sensor 60 can output signals to a control system, so that the reliability of the structure is improved.

The working principle of the progressive roller 42 centrifugal brake of the embodiment of the invention is as follows: when the rotation speed of the rotating shaft 20 reaches a certain value, the roller 42 overcomes the elastic force of the elastic member 43 under the centrifugal action, and gradually moves from the starting end to the terminal end of the arc-shaped chute 411, the roller 42 is linked with the shaft sleeve 30 under the action of the friction force and drives the shaft sleeve 30 to rotate together, the shaft sleeve 30 simultaneously moves relative to the housing 10, and pushes the annular spring 52 and the sliding sleeve 51 to move towards the pre-tightening spring 54, the axial force and the torsional force of the shaft sleeve 30 on the annular spring 52 are gradually increased, and the circumferential friction force generated by the annular spring 52 is also gradually increased until the rotating shaft 20 stops rotating, so as to realize braking.

The reset principle of the progressive roller 42 centrifugal brake of the embodiment of the invention is as follows: the external braked object is ensured to have enough safety measures to reset the brake. The shaft sleeve 30 is connected with a reset cover plate 44, a plurality of reset holes are arranged on the reset cover plate 44, and an outer hexagonal is arranged at one end of the rotating shaft 20. Firstly, a wrench is adopted to clamp one end of the outer hexagon of the rotating shaft 20, the rotating shaft rotates 1/3-1/2 circles in the opposite direction, the roller 42 is separated from the shaft sleeve 30 assembly under the action of the elastic piece 43, and the roller gradually moves from the terminal to the starting end of the arc-shaped sliding groove 411; then insert the special frock that resets in the hole that resets, the reverse rotation axis 20 covers realizes resetting.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.