CN116379122A - Clamping stagnation self-protection planetary roller screw pair and use method thereof - Google Patents

Abstract

The invention provides a clamping stagnation self-protection planetary roller screw pair and a use method thereof, and belongs to the technical field of planetary roller screws. The invention solves the problem of irreversible damage such as fracture of the screw rod after clamping stagnation through the design of the detachable connection of the power output ends of the redundancy module and the input module and the screw rod. The device comprises a screw rod, rollers, a first sleeve, a load ring, a redundancy module and an input module, wherein the rollers are radially arranged around the screw rod and are sealed by the first sleeve, the screw rod passes through the first sleeve and is meshed with the rollers, and the rollers are rotationally connected with the first sleeve; the redundant module connects the inner wall of the load ring and the outer wall of the first sleeve in a ball screw pair mode, the input module is detachably connected with the screw, and the first sleeve rotates around the axis of the screw to drive the input module to be detached from the screw.

Description

Clamping stagnation self-protection planetary roller screw pair and use method thereof

Technical Field

The invention belongs to the technical field of planetary roller screws, and particularly relates to a clamping stagnation self-protection planetary roller screw pair and a use method thereof.

Background

The planetary roller screw pair is a transmission device for converting rotary motion into linear motion, has the advantages of high bearing capacity, high precision, quick frequency response, low noise during high-speed operation and the like, and is widely applied to the fields of numerical control machine tools, aerospace and the like.

In the prior art, three main components of the planetary roller screw pair are a screw, a nut and rollers, and the planetary roller screw pair also comprises parts such as a load flange, wherein the rollers are radially arranged around the screw and are sealed by the nut, the screw passes through the nut and is meshed with the rollers in the nut, the load flange is sleeved on the outer wall of the nut, and the specific working procedure is as follows: the power device drives the screw rod to rotate, the screw rod rotates to drive the roller to rotate around the screw rod (similar to a planetary gear to a sun gear, the screw rod rotates and revolves), then the nut is driven to move along the rotating axial direction, and finally the load flange is driven to perform translational motion.

After the planetary roller screw pair works for a period of time, due to the influences of dust, precision of machining and assembling parts and the like, clamping stagnation can occur between the screw and the rollers, once the clamping stagnation occurs, the rollers can stop rotating around the screw, instead, the rollers can rotate along with the screw but do not autorotate, the nuts and the load flange rotate along with the screw and do not translate, the force generated by an object borne by the load flange can be converted into torsion opposite to the rotating direction, and at the moment, the rotation of the screw can be subjected to larger resistance torque, so that irreversible damage such as fracture occurs.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a clamping self-protecting planetary roller screw pair, which is used for solving the problem that in the prior art, the screw is easy to break and other irreversible damage after clamping of the screw and the rollers occurs.

To achieve the above and other related objects, the present invention provides a planet roller screw pair with self-protection by clamping, comprising:

the screw rod passes through the first sleeve and is meshed with the roller, the roller and the first sleeve are rotationally connected, the roller and the first sleeve are relatively limited in the axial direction of the screw rod, the screw rod and the first sleeve are coaxial, and the central axis of the roller and the central axis of the screw rod are parallel to each other;

the device comprises a load ring and a redundancy module, wherein the redundancy module connects the inner wall of the load ring and the outer wall of the first sleeve in a ball screw pair mode;

the input module is detachably connected with the lead screw;

rotation of the first sleeve about the lead screw axis drives the input module off of the lead screw.

Optionally, the input module includes an input shaft, a spline connection part, and a locking part, wherein the screw and the input shaft are relatively limited in radial direction and circumferential direction through the spline connection part, and the locking part is used for locking or disconnecting the axial connection of the screw and the spline connection part.

Optionally, the locking component includes:

the screw rod penetrates through the hollow telescopic rod and is connected with the spline connecting part;

the fixed ring is arranged between the hollow telescopic rod and the spline connecting part, the fixed ring is fixedly connected to an external working platform, and the screw rod penetrates through the fixed ring;

the hook is arranged on the fixed ring, one end of the hook and the inner wall of the hollow telescopic rod are defined relatively in the axial direction and the radial direction, the other end of the hook and the spline connecting part are defined relatively in the axial direction and the radial direction, and when the screw rod is clamped, the hook and the hollow telescopic rod rotate relatively and are unlocked with the hollow telescopic rod through the falling groove.

Optionally, the spline connection part comprises an internal spline hollow shaft and a spline connection shaft, one end of the internal spline hollow shaft is fixedly connected with the input shaft, the other end of the internal spline hollow shaft and one end of the spline connection shaft are relatively limited in radial and circumferential directions through a spline structure, and the other end of the spline connection shaft and the screw rod are relatively limited in radial and circumferential directions through a spline structure.

Optionally, the method further comprises: the tensioning spring, the one end of tensioning spring with spline connecting axle fixed connection, the other end of tensioning spring with internal spline cavity axle fixed connection, tensioning spring pulling spline connecting axle is greater than along axial length of connection between spline connecting axle and the lead screw along axial travel distance. Optionally, a buffer spring is arranged between the spline connecting shaft and the internal spline hollow shaft.

Optionally, a snap-fit component is disposed at one end of the spline connection shaft, and when jamming occurs, the screw rod and the spline connection shaft are disconnected, and the spline connection shaft and the internal spline hollow shaft are mutually limited in the axial direction through the snap-fit component.

Optionally, a chute is arranged on the inner wall of the hollow shaft with the internal spline, a groove is arranged at the end part of the chute, and the groove penetrates through the hollow shaft with the internal spline;

the buckle part comprises a buckle, a buckle spring and a telescopic groove, wherein the buckle spring is fixedly arranged in the telescopic groove, the rebound and contraction directions of the buckle spring are along the radial direction of the screw rod, one end of the buckle is fixedly connected with the buckle spring and is positioned in the telescopic groove, the other end of the buckle is positioned outside the telescopic groove, and the buckle is locked between the spline connecting shaft and the hollow shaft after sliding into the groove along the sliding groove.

Optionally, the redundant module includes second sleeve, raceway and ball, the telescopic inner wall of second parcel first telescopic outer wall, first sleeve with second sleeve fixed connection is in the same place, first sleeve with can dismantle between the second sleeve, the raceway is the heliciform and is set up in succession along the axial on the telescopic outer wall of second, the ball is located between the second sleeve with the load ring, first sleeve is around when the rotation of lead screw axis drive the ball is followed the raceway rolls, the second sleeve with the lead screw is coaxial.

The application method of the planetary roller screw pair based on the clamping stagnation self-protection comprises the following steps of:

the screw pair moves normally: the input module drives the lead screw to rotate, and through the lead screw pair, the rotation motion of the lead screw is converted into the translation motion of the load ring;

fault removal after stuck: the roller stops rotating around the screw rod, rotates along with the screw rod but does not rotate, rotates along with the first sleeve, finally drives the input module to be separated from the screw rod, stops rotating the screw rod, removes the load ring and repair the jammed parts;

restoring motion: and the replaced parts are assembled, the input module is connected with the lead screw, and the input module drives the lead screw to rotate again and is converted into translational movement of the load ring.

As described above, the clamping stagnation self-protection planetary roller screw pair has at least the following beneficial effects:

1. according to the design, the inner wall of the load ring and the outer wall of the first sleeve are connected in a ball screw pair mode, the first sleeve rotates around the axis of the screw to drive the input module to be separated from the screw, when the screw and the rollers are in clamping stagnation, the load ring cannot generate excessive resistance torque on the screw due to the connection relation between the load ring and the first sleeve, and meanwhile, after the clamping stagnation occurs, the first sleeve rotates around the axis of the screw to drive the input module to be separated from the screw in time, excessive torque generated by continuous rotation of the screw due to the fact that the clamping lag is avoided, and finally the problem that irreversible damage such as breakage and the like occurs to the screw due to the fact that the planetary roller screw pair is in clamping lag in the technical background is solved.

2. According to the self-protection planetary roller screw pair, due to the design of the hollow telescopic rod, when the self-protection planetary roller screw pair works normally, the hollow telescopic rod stretches and retracts along with the translation of the load ring, and the hollow telescopic rod plays a role similar to a track; when the clamping self-protection planetary roller screw pair is clamped, the hollow telescopic rod plays a role of a connecting piece, and the function of separating the spline connecting shaft from the screw through the connecting effect of the telescopic rod on the second sleeve and the hooks on the fixed ring is realized by rotating the second sleeve.

3. This application passes through the design of buckle part, when the jamming takes place, spline connection axle with behind the lead screw disconnection, the buckle can block in the recess, avoided the resilience of tensioning spring causes the spline connection axle with the lead screw is connected once more when the jamming trouble is not got rid of, after the jamming trouble is got rid of, needs with the buckle is pushed down, then pulling spline connection axle, will spline connection axle with the lead screw is connected together once more.

As described above, the use method of the clamping stagnation self-protection planetary roller screw pair has at least the following beneficial effects:

1. according to the method, through the step design of troubleshooting and restoring movement after clamping stagnation occurs, after the input module is separated from the lead screw, the load ring can be quickly and smoothly detached, and new parts are replaced, so that normal movement of the planetary roller lead screw pair is restored.

Drawings

Fig. 1 shows a schematic diagram of a planetary roller screw pair with self-protection by clamping.

Fig. 2 shows an exploded view of the interior of the load ring of the present invention.

Fig. 3 is a schematic structural view of the hollow telescopic rod of the present invention.

Fig. 4 shows a schematic view of the locking element of the present invention.

Fig. 5 shows a schematic view of the snap-on component of the invention.

Description of element reference numerals

Screw 11, roller 12, first sleeve 13, load ring 14, cage 15, ring gear 16, outer ring gear 17, redundancy module 2, second sleeve 21, raceway 22, ball 23, input module 3, input shaft 31, spline connection member 32, spline hollow shaft 321, spline connection shaft 322, annular groove 3221, locking member 33, hollow telescoping rod 331, first hollow sleeve 3311, second hollow sleeve 3312, third hollow sleeve 3313, drop groove 332, securing ring 333, hook 334, boss 3341, tension spring 335, buffer spring 336, snap member 34, runner 341, groove 342, snap 343, snap spring 344, telescoping groove 345.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

Please refer to fig. 1 to 5. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

The following examples are given by way of illustration only. Various embodiments may be combined and are not limited to only what is presented in the following single embodiment.

Referring to fig. 1 to 2, the present invention provides a planet roller screw pair with self-protection function, comprising:

a screw 11, a roller 12 and a first sleeve 13, wherein the roller 12 is radially arranged around the screw 11 and is sealed by the first sleeve 13, the screw 11 passes through the first sleeve 13 and is meshed with the roller 12, the roller 12 and the first sleeve 13 are rotationally connected, the roller 12 and the first sleeve 13 are relatively limited in the axial direction of the screw 11, the screw 11 and the first sleeve 13 are coaxial, and the central axis of the roller 12 and the central axis of the screw 11 are parallel;

a load ring 14 and a redundancy module 2, wherein the redundancy module 2 connects the inner wall of the load ring 14 and the outer wall of the first sleeve 13 in a ball screw pair manner;

an input module 3, wherein the input module 3 is detachably connected with the screw rod 11, and the rotation of the first sleeve 13 around the axis of the screw rod 11 drives the input module 3 to be separated from the screw rod 11;

when the lead screw 11 and the roller 12 are in clamping stagnation, the load ring 14 cannot generate excessive resistance torque on the lead screw 11 because of the connection relation between the load ring 14 and the first sleeve 13, and simultaneously, after the clamping stagnation occurs, the first sleeve 13 can rotate around the axis of the lead screw 11 to drive the input module 3 to be timely separated from the lead screw 11, so that the problem that excessive torque is generated due to continuous rotation of the lead screw 11 due to delayed clamping is solved, and the problem that the lead screw is irreversibly damaged due to breakage and the like caused by the fact that the planetary roller lead screw pair is in clamping stagnation in the technical background is finally solved.

Referring to fig. 1, the input module 3 includes an input shaft 31, a spline connection member 32, and a locking member 33, where the screw 11 and the input shaft 31 are defined by the spline connection member 32 in opposite radial and circumferential directions, the locking member 33 is configured to lock or disconnect the axial connection between the screw 11 and the spline connection member 32, and when the screw pair moves normally, the locking member 33 locks the screw 11 and the spline connection member 32, and when the screw pair is jammed, the locking member 33 disconnects the axial connection between the screw 11 and the spline connection member 32.

Referring to fig. 3 and 4, in this embodiment, the locking member 33 includes:

the hollow telescopic rod 331, one end of the hollow telescopic rod 331 is fixedly connected with the second sleeve 21, the other end of the hollow telescopic rod 331 is provided with a falling groove 332, the lead screw 11 penetrates through the hollow telescopic rod 331 and is connected with the spline connecting component 32, the hollow telescopic rod 331 is composed of three sections of hollow sleeves, namely a first hollow sleeve 3311, a second hollow sleeve 3312 and a third hollow sleeve 3313, one end of the first hollow sleeve 3311 is fixedly connected with the second sleeve 21 through a screw, one end of the third hollow sleeve 3313 is provided with a falling groove 332, the first hollow sleeve 3311 is provided with a first chute, the second hollow sleeve 3312 is provided with a second convex slide block and a second chute, the third hollow sleeve 3313 is provided with a third convex slide block, the second convex slide block is matched with the first chute, the third convex slide block is matched with the second chute, and the first hollow sleeve 3311, the second hollow sleeve 3312 and the third hollow sleeve 331 are formed into the hollow telescopic rod 331;

by the design of the hollow telescopic rod 331, when the clamping self-protection planetary roller screw pair works normally, the hollow telescopic rod 331 stretches and retracts along with the translation of the load ring 14, and the hollow telescopic rod 331 plays a role similar to a track; when the clamping self-protection planetary roller screw pair is clamped, the hollow telescopic rod 331 plays a role of a connecting piece;

a fixing ring 333, wherein the fixing ring 333 is installed between the hollow telescopic rod 331 and the spline connection part 32, the fixing ring 333 is fixedly connected to an external working platform, the screw 11 passes through the fixing ring 333, and the screw 11 and the fixing ring 333 have no connection relationship;

a hook 334, wherein the hook 334 is mounted on the fixed ring 333, one end of the hook 334 and the inner wall of the hollow telescopic rod 331 are relatively limited in the axial direction and the radial direction, the other end of the hook 334 and the spline connecting part 32 are relatively limited in the axial direction and the radial direction, when the screw 11 is jammed, the hook 334 and the hollow telescopic rod 331 relatively rotate and are unlocked with the hollow telescopic rod 331 through the falling groove 332, and the inner wall of the spline connecting shaft 322 is provided with an annular groove 3221;

an elastic device is arranged between the hook 334 and the fixed ring 333, a friction particle is arranged at one end of the hook 334, the inner side of the other end of the hook 334 is hinged with the fixed ring 333, a protrusion 3341 is arranged at the outer side of the other end of the hook 334, when no compression is performed, because of the elastic device, one end of the hook 334 provided with the friction particle is sprung outwards, the other end of the hook 334 is lowered, and when compression is performed, one end of the hook 334 provided with the friction particle is lowered, and the other end of the hook 334 is lifted;

when one end of the hook 334 contacts with the inner wall of the hollow telescopic rod 331, the friction particles ensure that the hollow telescopic rod 331 and the hook 334 do not move axially, the inner wall of the hollow telescopic rod 331 presses down one end of the hook 334, the other end of the hook 334 is lifted, and at the moment, the protrusion 3341 is clamped in the annular groove 3221, so that the spline connecting shaft 322 is ensured not to fall off from the fixed ring 333;

when the clamping stagnation occurs, the falling groove 332 rotates to the position of the hook 334, the hook 334 is separated from the inner wall of the hollow telescopic rod 331, at this time, one end of the hook 334 is lifted from the position of the falling groove 332, the other end of the hook 334 is lowered, the protrusion 3341 leaves the annular groove 3221, and the spline connection shaft 322 is separated from the fixed ring 333.

The above-mentioned connection function of the hollow telescopic rod 331 to the hooks 334 on the second sleeve 21 and the fixed ring 333 realizes the function of separating the spline connection shaft 322 from the screw 11 by rotating the second sleeve 21.

In this embodiment, referring to fig. 1 and 4, the spline connection component 32 includes an internal spline hollow shaft 321 and a spline connection shaft 322, one end of the internal spline hollow shaft 321 is fixedly connected with the input shaft 31, the other end of the internal spline hollow shaft 321 and one end of the spline connection shaft 322 are relatively limited in radial and circumferential directions by a spline structure, the other end of the spline connection shaft 322 and the screw 11 are relatively limited in radial and circumferential directions by a spline structure, and rotation of the input shaft 31 can be transmitted to the screw 11 through the internal spline hollow shaft 321 and the spline connection shaft 322, so as to drive the screw 11 to rotate, and when the screw 11 and the roller 12 are jammed, the connection between the input shaft 31 and the screw 11 can be timely disconnected by the cooperation of a locking component 33, the spline connection shaft 322 and the internal spline hollow shaft 321, which will be described later.

Referring to fig. 3 and 4, in this embodiment, the method further includes: the tensioning spring 335, the one end of tensioning spring 335 with spline connecting axle 322 fixed connection, the other end of tensioning spring 335 with internal spline hollow shaft 321 fixed connection, tensioning spring 335 pulling spline connecting axle 322 along axial travel distance is greater than spline connecting axle 322 with axial length of connection between the lead screw 11, during the vice normal work of lead screw, spline connecting axle 322 with hollow telescopic link 331 fixed connection together, tensioning spring 335 is in tensile state, when the jamming takes place, the spline connecting axle 322 with the connection position unblock between the hollow telescopic link 331, tensioning spring 335 is retracted gradually by tensile state to pulling spline connecting axle 322 with lead screw 11 breaks away from mutually, finally reaches input shaft 31 with the purpose that lead screw 11 breaks away from mutually.

In this embodiment, referring to fig. 4, a buffer spring 336 is disposed between the spline connection shaft 322 and the hollow internal spline shaft 321, so as to avoid collision between the spline connection shaft 322 and the hollow internal spline shaft 321 during retraction of the tension spring 335.

In this embodiment, referring to fig. 3 and 5, a snap member 34 is disposed at one end of the spline connection shaft 322, and when a clamping stagnation occurs, the screw 11 and the spline connection shaft 322 are disconnected, and the spline connection shaft 322 and the hollow shaft 321 are axially defined by the snap member 34.

In this embodiment, referring to fig. 3 and 5, a chute 341 is disposed on an inner wall of the hollow shaft 321, a groove 342 is disposed at an end of the chute 341, and the groove 342 penetrates through the hollow shaft 321;

the fastening component 34 includes a fastening 343, a fastening spring 344 and a telescopic slot 345, the fastening spring 344 is fixedly installed in the telescopic slot 345, the rebound and contraction directions of the fastening spring 344 are along the radial direction of the screw 11, one end of the fastening 343 is fixedly connected with the fastening spring 344 and is located in the telescopic slot 345, the other end of the fastening 343 is located outside the telescopic slot 345, and after the fastening 343 slides into the groove 342 along the sliding slot 341, the spline connecting shaft 322 and the internal spline hollow shaft 321 are locked;

through the design of the buckle component 34, when the clamping stagnation occurs, after the spline connecting shaft 322 is disconnected with the screw rod 11, the buckle 343 can be clamped in the groove 342, so that the rebound of the tensioning spring 335 is avoided, the spline connecting shaft 322 and the screw rod 11 are connected again when the clamping stagnation fault is not eliminated, after the clamping stagnation fault is eliminated, the buckle 343 needs to be pressed down, and then the spline connecting shaft 322 is pulled, so that the spline connecting shaft 322 and the screw rod 11 are connected together again.

In this embodiment, referring to fig. 1 and 2, the redundancy module 2 includes a second sleeve 21, a rolling path 22 and a ball 23, where an inner wall of the second sleeve 21 wraps an outer wall of the first sleeve 13, the first sleeve 13 and the second sleeve 21 are fixedly connected together, the first sleeve 13 and the second sleeve 21 are detachable, the rolling path 22 is continuously disposed on an outer wall of the second sleeve 21 in a spiral shape along an axial direction, the ball 23 is disposed on an inner wall of the load ring 14, the ball 23 rolls along the rolling path 22, the second sleeve 21 and the screw 11 are coaxial, friction force between the ball 23 and the rolling path 22 ensures that the ball 23 does not roll when the screw pair is in a dead-time state, the ball 23 receives a force to roll along the rolling path 22 along with rotation of the first sleeve 13 driving rotation of the second sleeve 21, and this structure can be understood as a new screw of an original pair of rollers, i.e. a new screw is used as an original pair of rollers.

In this embodiment, referring to fig. 2, the roller device further includes two retainers 15, wherein the two retainers 15 are respectively installed at two ends of the first sleeve 13, and two ends of the roller 12 are respectively rotatably connected with the two retainers 15;

the inner wall of the first sleeve 13 is provided with threads, and the roller 12 is meshed with the inner wall of the first sleeve 13 to play a role in transmission.

In this embodiment, referring to fig. 2, the device further includes two ring gears 16, the two ring gears 16 are respectively fixedly installed at two ends of the first sleeve 13, and the ring gears 16 and the screw 11 are coaxial;

the two ends of the roller 12 are respectively provided with an outer coaxial ring gear 17, and the outer ring gear 17 and the inner ring gear 16 on the same side are meshed;

by the design of the inner gear ring 16 and the outer gear ring 17, the tilting moment generated by the screw angle of the screw rod 11 on the roller 12 can be eliminated, and the axis of the roller 12 is ensured to be parallel to the axis of the screw rod 11 to roll normally.

In this embodiment, referring to fig. 2, the screw pair further includes a spring collar 18, where the spring collar 18 is installed between the retainer 15 and the ring gear 16, so as to increase the stability of the screw pair during operation.

Referring to fig. 1 to 5, the present invention provides a method for using a planetary roller screw pair based on self-protection of clamping stagnation, comprising the following steps:

the screw pair moves normally: the input shaft 31 is driven to rotate by power provided by a motor, the lead screw 11 is driven to rotate by the hollow internal spline shaft 321 and the spline connecting shaft 322, the rotation motion of the lead screw 11 is converted into the translational motion of the first sleeve 13, the second sleeve 21 and the load ring 14 by the matching relationship of the lead screw 11, the roller 12 and the first sleeve 13, the hollow telescopic rod 331 stretches or retracts along with the translational motion of the second sleeve 21, the hook 334 fixedly connects the hollow telescopic rod 331 and the spline connecting shaft 322 together, and the spline connecting shaft 322 and the lead screw 11 are mutually limited by a spline structure;

fault removal after stuck: when a click lag occurs between the screw 11 and the roller 12, the roller 12 stops rotating around the screw 11, rotates along with the screw 11 but does not rotate, and rotates along with the first sleeve 13 and the second sleeve 21, and as the second sleeve 21 rotates, due to the cooperation between the balls 23 on the inner wall of the load ring 14 and the raceways 22 on the outer wall of the second sleeve 21, the second sleeve 21 rotates out of the load ring 14 and rotates along with the hollow telescopic rod 331, and when the drop groove 332 rotates to the position of the hook 334, the screw 11 and the spline connecting shaft 322 are axially away from each other under the action of the tension spring 335;

with the spline connection shaft 322 moving in the axial direction, the screw rod 11 and the spline connection shaft 322 are separated from each other, the buckle 343 slides into the groove 342, the spline connection shaft 322 and the internal spline hollow shaft 321 are fixed to each other due to the cooperation of the buckle 343 and the groove 342, and the rotation of the screw rod 11 is stopped;

the load ring 14 is removed, the screw rod 11, the roller 12, the first sleeve 13, the second sleeve 21 and the hollow telescopic rod 331 are replaced integrally, and the replaced parts are repaired;

restoring motion: after the replacement parts are assembled, the buckle 343 in the groove 342 is pressed down to connect the spline connecting shaft 322 with the hollow telescopic rod 331, the hollow telescopic rod 331 is rotated to ensure that the position of the hook 334 and the position of the falling groove 332 are staggered, at this time, the spline connecting shaft 322 and the screw 11 are mutually limited again through a spline structure, the input shaft 31 is driven to rotate and the screw 11 is driven to rotate by providing power again, and the rotation of the screw 11 drives the first sleeve 13, the second sleeve 21 and the load ring 14 to perform translational motion.

In summary, the design of the redundancy module 2 realizes the function of meshing the inner wall of the load ring 14 and the outer wall of the first sleeve 13, when the lead screw 11 and the roller 12 are jammed, the load ring 14 does not generate excessive resistance torque on the lead screw 11 because the load ring 14 is meshed with the first sleeve 13, and simultaneously, after the jamming occurs, the first sleeve 13 rotates around the axis of the lead screw 11 to drive the input module 3 to be separated from the lead screw 11 in time, so that the jamming is avoided, excessive torque is generated by continuous rotation of the lead screw 11, and irreversible damage such as breakage and the like of the lead screw 11 is caused; meanwhile, due to the design of the hollow telescopic rod 331, when the clamping self-protection planetary roller screw pair works normally, the hollow telescopic rod 331 stretches and retracts along with the translation of the load ring 14, and the hollow telescopic rod 331 plays a role similar to a track; when the clamping self-protection planetary roller screw pair is clamped, the hollow telescopic rod 331 plays a role of a connecting piece, and the function of separating the spline connecting shaft 322 from the screw 11 is realized by the connection effect of the hollow telescopic rod 331 on the hooks 334 on the second sleeve 21 and the fixed ring 333 through the rotation of the second sleeve 21; still through the design of buckle part 34, when the jamming takes place, spline connecting axle 322 with behind the lead screw 11 disconnection, buckle 343 can block in recess 342, avoided the resilience of tensioning spring 335 causes spline connecting axle 322 with lead screw 11 is connected once more when the jamming trouble is not got rid of, after the jamming trouble is got rid of, need with buckle 343 is pushed down, then pulling spline connecting axle 322, will spline connecting axle 322 with lead screw 11 connects together again. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The utility model provides a planet roller screw pair of clamping stagnation self preservation protects which characterized in that: comprising the following steps:

the screw rod passes through the first sleeve and is meshed with the roller, the roller and the first sleeve are rotationally connected, the roller and the first sleeve are relatively limited in the axial direction of the screw rod, the screw rod and the first sleeve are coaxial, and the central axis of the roller and the central axis of the screw rod are parallel to each other;

the device comprises a load ring and a redundancy module, wherein the redundancy module connects the inner wall of the load ring and the outer wall of the first sleeve in a ball screw pair mode;

the input module is detachably connected with the lead screw;

rotation of the first sleeve about the lead screw axis drives the input module off of the lead screw.

2. The clamping self-protection planetary roller screw pair according to claim 1, wherein: the input module comprises an input shaft, a spline connection part and a locking part, wherein the lead screw and the input shaft are relatively limited in the radial direction and the circumferential direction through the spline connection part, and the locking part is used for locking or disconnecting the axial connection of the lead screw and the spline connection part.

3. The clamping self-protection planetary roller screw pair according to claim 2, wherein: the locking member includes:

the screw rod penetrates through the hollow telescopic rod and is connected with the spline connecting part;

the fixed ring is arranged between the hollow telescopic rod and the spline connecting part, the fixed ring is fixedly connected to an external working platform, and the screw rod penetrates through the fixed ring;

the hook is arranged on the fixed ring, one end of the hook and the inner wall of the hollow telescopic rod are defined relatively in the axial direction and the radial direction, the other end of the hook and the spline connecting part are defined relatively in the axial direction and the radial direction, and when the screw rod is clamped, the hook and the hollow telescopic rod rotate relatively and are unlocked with the hollow telescopic rod through the falling groove.

4. The clamping self-protection planetary roller screw pair according to claim 2, wherein: the spline connecting component comprises an internal spline hollow shaft and a spline connecting shaft, one end of the internal spline hollow shaft is fixedly connected with the input shaft, the other end of the internal spline hollow shaft and one end of the spline connecting shaft are relatively limited in the radial direction and the circumferential direction through a spline structure, and the other end of the spline connecting shaft and the screw rod are relatively limited in the radial direction and the circumferential direction through a spline structure.

5. The self-retaining planetary roller screw pair according to claim 4, wherein: further comprises: the tensioning spring, the one end of tensioning spring with spline connecting axle fixed connection, the other end of tensioning spring with internal spline cavity axle fixed connection, tensioning spring pulling spline connecting axle is greater than along axial length of connection between spline connecting axle and the lead screw along axial travel distance.

6. The self-retaining planetary roller screw pair according to claim 4, wherein: and a buffer spring is arranged between the spline connecting shaft and the internal spline hollow shaft.

7. The self-retaining planetary roller screw pair according to claim 4, wherein: one end of the spline connecting shaft is provided with a clamping component, when clamping stagnation occurs, the screw rod is disconnected with the spline connecting shaft, and the spline connecting shaft and the internal spline hollow shaft are mutually limited in the axial direction through the clamping component.

8. The self-retaining planetary roller screw pair according to claim 7, wherein: a chute is arranged on the inner wall of the internal spline hollow shaft, a groove is arranged at the end part of the chute, and the groove penetrates through the internal spline hollow shaft;

the buckle part comprises a buckle, a buckle spring and a telescopic groove, wherein the buckle spring is fixedly arranged in the telescopic groove, the rebound and contraction directions of the buckle spring are along the radial direction of the screw rod, one end of the buckle is fixedly connected with the buckle spring and is positioned in the telescopic groove, the other end of the buckle is positioned outside the telescopic groove, and the buckle is locked between the spline connecting shaft and the hollow shaft after sliding into the groove along the sliding groove.

9. The clamping self-protection planetary roller screw pair according to claim 1, wherein: the redundant module comprises a second sleeve, a rollaway nest and balls, wherein the outer wall of the first sleeve is wrapped by the inner wall of the second sleeve, the first sleeve and the second sleeve are fixedly connected together, the first sleeve and the second sleeve are detachable, the rollaway nest is continuously arranged on the outer wall of the second sleeve in a spiral shape along the axial direction, the balls are positioned between the second sleeve and the load ring, and the balls are driven to roll along the rollaway nest when the first sleeve rotates around the axis of the screw rod, and the second sleeve and the screw rod are coaxial.

10. The using method of the self-retaining planet roller screw pair based on the clamping stagnation is characterized by comprising the following steps of: the method comprises the following steps:

the screw pair moves normally: the input module drives the lead screw to rotate, and through the lead screw pair, the rotation motion of the lead screw is converted into the translation motion of the load ring;

fault removal after stuck: the roller stops rotating around the screw rod, rotates along with the screw rod but does not rotate, rotates along with the first sleeve, finally drives the input module to be separated from the screw rod, stops rotating the screw rod, removes the load ring and repair the jammed parts;

restoring motion: and the replaced parts are assembled, the input module is connected with the lead screw, and the input module drives the lead screw to rotate again and is converted into translational movement of the load ring.

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