CN115958622A

CN115958622A - Single-drive double-control type clamping rotary driving mechanism

Info

Publication number: CN115958622A
Application number: CN202310022104.1A
Authority: CN
Inventors: 肖卫洪; 苟大利; 苟渝路
Original assignee: CHENGDU AEROSPACE FENGHUO PRECISION ELECTROMECHANICAL CO LTD
Current assignee: CHENGDU AEROSPACE FENGHUO PRECISION ELECTROMECHANICAL CO LTD
Priority date: 2023-01-06
Filing date: 2023-01-06
Publication date: 2023-04-14

Abstract

The invention discloses a single-drive double-control type clamping and rotating driving mechanism which comprises a base, a driving motor, a clamping jaw mechanism, a transmission mechanism, a clutch mechanism and a middle rotary cylinder, wherein a base through hole is formed in the base, the driving motor is installed on the base, the clamping jaw mechanism is located at one end of the base through hole, the middle rotary cylinder is installed in the base through hole, the middle rotary cylinder is connected with the hole wall of the base through hole through a rotary cylinder bearing, the rotary cylinder bearing is a one-way bearing, the transmission mechanism is installed in the base through hole and is respectively connected with a rotating shaft of the driving motor and the clamping jaw mechanism, the clamping jaw mechanism is installed at one end of the middle rotary cylinder, and the clutch mechanism is installed in the base through hole and is respectively connected with the transmission mechanism and the middle rotary cylinder. The invention realizes the function of clamping and driving the workpiece and then driving the transmission mechanism, the clamping jaw mechanism, the middle rotary cylinder and the clutch mechanism to synchronously rotate by one driving motor, saves the purchase cost of driving equipment and reduces the volume and the weight of the whole machine.

Description

Single-drive double-control type clamping rotary driving mechanism

Technical Field

The invention relates to a clamping and rotating driving mechanism capable of clamping a workpiece and driving the workpiece to rotate, in particular to a single-drive double-control type clamping and rotating driving mechanism, and belongs to the technical field of rotating drive.

Background

In the lathe machining industry and the non-standard equipment design of a similar lathe, in the process of performing circular cutting on workpieces such as pipe materials or bar materials, the workpieces need to be clamped firstly, then rotated, and fed through a cutter to realize the circular cutting function. The clamping device comprises a clamping head, a clamping jaw mechanism, a motor, a clamping head and a clamping head, wherein the clamping mode of clamping a workpiece generally adopts a clamping chuck or a clamping jaw mechanism, the clamping chuck generally drives a hydraulic cylinder to clamp the workpiece, and the clamping jaw mechanism generally drives a plurality of clamping jaws arranged along the circumferential direction to clamp the workpiece through the motor; the rotating mode drives the whole clamping mechanism to rotate together through a motor.

The above-mentioned two consecutive actions of clamping and rotation are all accomplished by adopting an independent driving mode in the traditional driving mode, so two driving devices are required, such as two driving motors or one driving motor and one driving hydraulic cylinder, etc., and the traditional structure has the following defects:

if a driving structure of a motor and a hydraulic cylinder is adopted, the hydraulic cylinder needs to rotate along with the main shaft, a hydraulic slip ring needs to be used, and the problems of oil leakage failure and the like can be caused by long-time use of the hydraulic slip ring; if two motors are adopted for driving, the internal motor and an external cable are connected through a slip ring, and the problems of wear failure of the slip ring, poor contact or disconnection and the like can be caused; meanwhile, the two driving devices have the problems of large overall structure, large mass and high failure rate.

In addition, when the apparatus is required to be used in severe environments such as ultra-high temperature, ultra-low temperature or strong radiation environments, the driving motor having tolerance to these environments is rather expensive, and the use of two driving apparatuses raises the production cost of an enterprise.

Disclosure of Invention

The present invention is directed to solve the above problems and to provide a single-drive dual-control clamping and rotation driving mechanism capable of clamping and rotating a workpiece with only one driving device.

The invention realizes the purpose through the following technical scheme:

the utility model provides a two accuse formula centre gripping rotary driving mechanism of single-drive, includes base, driving motor and clamping jaw mechanism, be equipped with radial cross-section on the base and be circular shape base through-hole, driving motor installs on the outer wall of base, clamping jaw mechanism is located the one end of base through-hole just can realize clamping function and realize loosening function under driving motor's the pivot rotary driving under reverse direction rotary driving, two accuse formula centre gripping rotary driving mechanism of single-drive still includes drive mechanism, clutch mechanism and middle revolving drum, the barrel shape the middle revolving drum is installed in the base through-hole and central line coincidence between them, the outer wall of middle revolving drum with connect through the revolving drum bearing between the pore wall of base through-hole, the revolving drum bearing is one-way bearing, drive mechanism installs in the base through-hole and respectively with driving motor's pivot with clamping jaw mechanism connects, clamping jaw mechanism installs the one end of middle revolving drum, clutch mechanism installs in the base through-hole and respectively with drive mechanism with middle revolving drum connects, clutch mechanism is used for make clamping jaw mechanism accomplish before the clamping jaw mechanism can not just for the base rotation mechanism can be for the base rotation.

Preferably, in order to sequentially realize the optimal transmission processes of no-load starting, gradual loading, driving clamping and rotary driving, the transmission mechanism comprises a worm, a worm wheel assembly, a transmission ring, a first pressure spring, a follow-up ring, a friction ring and a hollow main shaft, the hollow main shaft in a cylinder shape is arranged in a central through hole of the middle rotary cylinder, the central lines of the hollow main shaft and the middle rotary cylinder are overlapped, a section of outer wall, close to the first end in two ends, in the hollow main shaft is connected with the inner wall of the middle rotary cylinder through a through hole main shaft bearing, the annular worm wheel assembly, the annular transmission ring, the annular follow-up ring and the annular friction ring are all sleeved on a section of outer wall, close to the second end in two ends, in the hollow main shaft through a central through hole of the worm wheel assembly, the annular drive ring, the annular follow-up ring and the annular friction ring are sequentially arranged in parallel in the axial direction, the worm wheel assembly comprises a worm wheel ring and a first straight tooth ring which are arranged in parallel and are integrally formed, evenly be equipped with the worm tooth of a plurality of evaginations on the circumference outer wall of worm wheel ring and through this a plurality of worm tooth with worm tooth meshing on the worm is connected, the worm passes through the worm bearing and installs in the base through-hole and its axial with the axial mutually perpendicular of base through-hole, the one end of worm is passed corresponding through-hole on the pore wall of base through-hole with driving motor's pivot is connected, evenly be equipped with the bar straight-tooth of a plurality of evaginations on the circumference outer wall of first straight-tooth ring and this bar straight-tooth with the axial of the central through-hole of worm wheel assembly is parallel to each other, the central through-hole of worm wheel assembly with be connected through worm wheel assembly bearing between the outer wall of hollow spindle, the driving ring includes the disc that forms to radial outside circumferential direction extension, the position that the axial both sides of disc are close to central through-hole is equipped with second straight-tooth ring and third straight-tooth ring respectively, a plurality of straight bar teeth protruding towards the central line direction are uniformly arranged on the inner circumferential wall of the second straight gear ring, a plurality of convex straight bar teeth are uniformly arranged on the outer circumferential wall of the third straight gear ring, the straight bar teeth of the second straight gear ring and the straight bar teeth of the third straight gear ring are all parallel to each other along the axial direction of the central through hole of the transmission ring, the second straight gear ring is sleeved outside the first straight gear ring and is meshed with the straight bar teeth of the second straight gear ring, an internal thread is arranged on the inner circumferential wall of the third straight gear ring, an external thread is arranged on the outer wall of the hollow main shaft corresponding to the third straight gear ring and is connected with the internal thread of the third straight gear ring through the external thread, a plurality of straight bar teeth protruding towards the central line direction are uniformly arranged on the inner circumferential wall of the follower ring and are parallel to each other along the axial direction of the central through hole of the follower ring, the servo ring is sleeved outside the third straight-tooth ring through a central through hole of the servo ring, a straight bar-shaped straight tooth of the servo ring is meshed with a straight bar-shaped straight tooth of the third straight-tooth ring, a plurality of servo ring blind holes are uniformly formed in an annular surface on one side, close to the transmission ring, of the servo ring, a plurality of transmission ring blind holes are uniformly formed in a surface, close to the servo ring, of one side of the disc of the transmission ring along the circumferential direction, two ends of the first pressure springs are respectively arranged in the servo ring blind holes and the transmission ring blind holes, the wall of the central through hole of the friction ring is in close contact with the outer circumferential wall of the hollow main shaft, an annular surface on one side of the friction ring is close to one side, far away from the transmission ring, of the servo ring, and an annular step surface, protruding outwards, on the outer circumferential wall of the hollow main shaft, of the annular surface on the other side of the friction ring is close to the annular step surface of the annular step surface, protruding outwards The first end of the hollow main shaft is close to the clamping jaw mechanism and is connected with the clamping jaw mechanism.

Preferably, in order to realize the reliable clamping function of the workpiece and drive the middle rotary cylinder to synchronously rotate, the clamping jaw mechanism comprises a plurality of clamping jaws, a plurality of pull rods, a plurality of pin shafts, a plurality of connecting screws, a plurality of driving screws and a driving disc, the clamping jaws are in an isosceles triangle or isosceles-like shape, one end of each of two base angles of the clamping jaws is a large end, one end of each of vertex angles of the clamping jaws is a small end, the large ends of the clamping jaws are respectively and rotatably connected with one ends of the pull rods through the pin shafts, the other ends of the pull rods are respectively and uniformly installed at the corresponding circular end parts of the middle rotary cylinder, the small ends of the clamping jaws are close to the central line of the middle rotary cylinder and jointly surround to form a circular clamping hole, a plurality of connecting screw is located a plurality ofly respectively pull rod and a plurality of space between the main aspects of clamping jaw and respectively with the ring shape terminal surface of first end of hollow spindle is connected, and is a plurality of drive screw respectively with driving-disc and a plurality of connecting screw's main aspects jogged joint, it is a plurality of the clamping jaw is located the driving-disc with between the first end of hollow spindle, be close to on the clamping jaw a side surface of hollow spindle is equipped with the clamping jaw sand grip of evagination, evenly be equipped with a plurality of main shaft recesses along the circumferencial direction on the ring shape terminal surface of first end of hollow spindle, it is a plurality of the clamping jaw sand grip is arranged in a plurality of respectively in the main shaft recess and can be in the main shaft recess after sliding a section circular arc distance by the cell wall of main shaft recess blocks.

Preferably, in order to facilitate the cooperation with the transmission mechanism to realize the function that the intermediate rotary drum cannot rotate relative to the base before the clamping jaw mechanism completes the clamping function and can rotate relative to the base after the clamping jaw mechanism completes the clamping function, the clutch mechanism comprises a clutch ring, a clutch rod and a second pressure spring, the annular clutch ring is sleeved outside the intermediate rotary drum through a self central through hole and is positioned in the through hole of the base, a plurality of radial clutch ring through holes are uniformly arranged on the ring wall of the clutch ring along the circumferential direction, a ball is arranged in each clutch ring through hole, the outer diameter of each ball is larger than the axial length of each clutch ring through hole, a plurality of rotary drum ball grooves which are uniformly distributed along the circumferential direction and are strip-shaped in the axial direction of the intermediate rotary drum are arranged on the circumferential outer wall of the intermediate rotary drum and correspond to the plurality of balls on the clutch ring, a plurality of first base ball grooves which are uniformly distributed along the circumferential direction and are in a strip shape along the axial direction of the base through hole are arranged on the hole wall of the base through hole at positions corresponding to the plurality of balls on the clutch ring, second base ball grooves in the circumferential direction are arranged on the hole wall of the base through hole at positions corresponding to the plurality of balls on the clutch ring, the circular second base ball grooves are respectively intersected with the middle sections of the plurality of first base ball grooves, the plurality of balls on the clutch ring are respectively and simultaneously arranged in the plurality of rotary cylinder ball grooves and the plurality of first base ball grooves, a plurality of clutch ring convex blocks which are uniformly distributed along the circumferential direction and are convex towards the central line direction of the clutch ring are arranged on the inner wall of the circumference of the clutch ring, and radial rotary cylinder blind holes are respectively arranged on the outer wall of the circumference of the middle rotary cylinder at positions corresponding to the plurality of clutch ring convex blocks, the clutch ring convex blocks are respectively arranged in the rotary cylinder blind holes, the axial direction of the second pressure spring is the same as that of the middle rotary cylinder, the second pressure springs are arranged in the rotary cylinder blind holes, one end of each second pressure spring is in contact with one end of the corresponding clutch ring convex block, the other end of each second pressure spring is in contact with one end of the rotary cylinder blind hole, far away from the transmission ring, of the rotary cylinder, a plurality of axial rotary cylinder clutch holes are uniformly formed in the cylinder wall of the middle rotary cylinder in the circumferential direction, one ends of the rotary cylinder clutch holes are in one-to-one correspondence with the rotary cylinder blind holes and are communicated with the rotary cylinder blind holes, the other ends of the rotary cylinder clutch holes extend to one end surface, close to the transmission ring, of the middle rotary cylinder and are open, the clutch rods are respectively arranged in the rotary cylinder clutch holes, one ends of the clutch rods are respectively in contact with the other ends of the clutch ring convex blocks, and the other ends of the clutch rods are close to the disc of the transmission ring and can be in contact with the disc of the transmission ring.

Preferably, in order to facilitate installation of the rotary cylinder bearings and setting of the rotary cylinder blind holes, the outer wall of the middle section circumference of the middle rotary cylinder protrudes towards the outer circumference to form a rotary cylinder convex ring, the rotary cylinder convex ring is positioned between the two rotary cylinder bearings, the plurality of rotary cylinder blind holes respectively penetrate through the rotary cylinder convex ring, and the plurality of rotary cylinder ball grooves are formed in the outer wall of the rotary cylinder convex ring.

Preferably, in order to facilitate better positioning of the clutch rod and prevent the disc of the transmission ring from being separated from the first straight-tooth ring of the worm gear assembly due to the fact that the moving distance of the disc of the transmission ring in the direction close to the middle rotary cylinder is too large, an annular positioning ring is arranged between the middle rotary cylinder and the transmission ring and sleeved outside the follow-up ring and the friction ring through a center through hole of the positioning ring, the positioning ring is connected with the corresponding end of the middle rotary cylinder, a plurality of positioning ring through holes which are uniformly distributed in the circumferential direction and are axially communicated are formed in the ring wall of the positioning ring, and the clutch rod penetrates through the positioning ring through holes respectively.

The invention has the beneficial effects that:

the invention integrally installs the driving motor, the transmission mechanism, the clamping jaw mechanism, the clutch mechanism and the middle rotary cylinder on the base, utilizes the transmission mechanism to connect the driving motor and the clamping jaw mechanism, connects the clamping jaw mechanism with the middle rotary cylinder, installs the middle rotary cylinder in the through hole of the base through the rotary cylinder bearing, and utilizes the one-way rotation function of the rotary cylinder bearing to realize the function that the middle rotary cylinder can smoothly rotate in one direction and can not rotate in the opposite direction, and realizes the function that the middle rotary cylinder can not rotate relative to the base before the clamping jaw mechanism completes the clamping function and can rotate relative to the base after the clamping jaw mechanism completes the clamping function through the clutch mechanism, finally realizes the function that a workpiece is clamped and driven by one driving motor and then drives the transmission mechanism, the clamping jaw mechanism, the middle rotary cylinder and the clutch mechanism to synchronously rotate, improves the traditional clamping and rotating mechanism needing two driving devices into the clamping and rotating mechanism needing only one driving motor, saves the purchasing cost of the driving devices, avoids the problem of wear failure caused by the joint cooperation of the two driving devices, reduces the volume and the weight of the whole machine, and solves the problem of high failure rate caused by the joint cooperation of the two driving devices.

The invention adopts a transmission mechanism which is composed of a worm, a worm wheel component, a transmission ring, a first pressure spring, a follower ring, a friction ring and a hollow main shaft, a driving motor drives the worm to rotate, the worm drives the worm wheel component to rotate, so that the transmission ring and the follower ring are driven to synchronously rotate, no-load starting is realized, the transmission ring moves towards the direction close to a middle revolving drum while rotating, the follower ring is extruded by the first pressure spring, the friction ring is extruded by the follower ring, a gradual loading process is realized, finally, the hollow main shaft is driven to synchronously rotate when the friction force is large enough, the hollow main shaft drives a plurality of clamping jaws to respectively rotate around corresponding pin shafts, a clamping function on a workpiece is realized, the clamping jaw mechanism and the middle revolving drum are driven to synchronously rotate after clamping, the rotation limit of the middle revolving drum is removed by the clutch mechanism, so that free rotation is realized, and the optimal transmission process of no-load starting, gradual loading, clamping and rotation driving is finally realized in sequence.

The clamping jaw mechanism comprises a plurality of clamping jaws, a plurality of pull rods, a plurality of pin shafts and a plurality of connecting screws, the plurality of clamping jaws are driven to rotate to realize the clamping function of a workpiece in the rotating process of the hollow main shaft, and after clamping, the connecting structure between the clamping jaws and the hollow main shaft, the connecting screws, the driving disc and the pull rods drive the middle rotary cylinder to rotate synchronously, so that the purpose of rotating and driving the workpiece is realized, and finally, the driving purpose of clamping firstly and then rotating is realized through one driving motor.

The clutch mechanism comprises the clutch ring, the clutch rod and the second pressure spring, when the transmission ring starts to rotate, the clutch ring is close to the transmission ring under the action of the elastic force of the second pressure spring, the balls are simultaneously positioned in the ball groove of the rotary cylinder and the ball groove of the first base and are not positioned in the ball groove of the second base, so that the middle rotary cylinder cannot rotate relative to the base under the action of the balls, after the transmission ring rotates for a certain time, the disk of the transmission ring pushes the clutch rod to move towards the direction close to the second pressure spring by overcoming the elastic force of the second pressure spring, the clutch ring convex block and the clutch ring are driven to synchronously move towards the direction close to the clamping jaw mechanism until the balls are positioned in the ball groove of the second base, the balls can rotate in the ball groove of the second base, so that the middle rotary cylinder can rotate relative to the base, and finally, the function of driving the transmission mechanism, the clamping jaw mechanism, the middle rotary cylinder and the clutch mechanism to synchronously rotate through the driving motor is realized.

Drawings

FIG. 1 is a perspective view of a single drive, dual control, clamping rotary drive mechanism according to the present invention;

FIG. 2 is a perspective view of the base of the single drive, dual control, clamping rotary drive mechanism of the present invention;

FIG. 3 is a perspective view, in half section, of the single drive, dual control, clamping, and rotary drive mechanism of the present invention;

FIG. 4 is a half-sectional perspective view of the hollow spindle, the jaw mechanism and the intermediate rotary drum of the single-drive dual-control clamping rotary drive mechanism of the present invention;

FIG. 5 is a front view of the hollow spindle, jaw mechanism and intermediate rotary drum of the single drive dual control gripping rotary drive mechanism of the present invention;

FIG. 6 is a perspective view of a worm gear assembly of the single drive, dual control, clamping rotary drive mechanism of the present invention;

FIG. 7 is a perspective view of the drive ring of the single drive dual control clamping rotary drive mechanism of the present invention;

FIG. 8 is a perspective view of a follower ring of the single drive dual control gripping rotary drive mechanism of the present invention;

FIG. 9 is a perspective view of the intermediate rotary drum of the single drive dual control clamping rotary drive mechanism of the present invention;

fig. 10 is a perspective view of the clutch ring of the single drive dual clamp rotary drive mechanism of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1-10, the single-drive double-control type clamping and rotating driving mechanism of the present invention includes a base 1, a driving motor 5, a clamping jaw mechanism, a transmission mechanism, a clutch mechanism and a middle rotary drum 10, wherein the base 1 is provided with a base through hole (not labeled in the figures) having a circular radial cross section, the driving motor 5 is installed on the outer wall of the base 1, the clamping jaw mechanism is located at one end of the base through hole and can realize a clamping function under the rotation drive of the rotating shaft of the driving motor 5 and a loosening function under the reverse rotation drive of the rotating shaft of the driving motor 5 (the function can be realized by the clamping jaw mechanism in the prior art), the middle rotary drum 10 having a cylindrical shape is installed in the base through hole and the center lines of the two coincide with each other, the outer wall of the middle rotary drum 10 and the hole wall of the base through hole are connected through a rotary drum bearing 9, the rotary drum bearing 9 is a one-way bearing, the transmission mechanism is installed in the base through hole and is respectively connected with the rotating shaft of the driving motor 5 and the clamping jaw mechanism, the clamping jaw mechanism is installed at one end of the middle rotary drum 10, the clamping jaw mechanism is installed in the base through hole and the clutch mechanism and is used for enabling the clamping jaw mechanism to complete the clamping jaw mechanism after rotating relative to the base 1 and completing the clamping jaw mechanism.

As shown in fig. 1 to fig. 10, the present invention also discloses a plurality of more optimized specific structures, and the structures can be combined with one or more specific structures to form a more optimized technical solution according to actual needs.

In order to sequentially realize the optimal transmission process of no-load starting, gradual loading, driving clamping and rotary driving, the transmission mechanism comprises a worm 27, a worm gear assembly 20, a transmission ring 19, a first pressure spring 18, a follower ring 17, a friction ring 16 and a hollow main shaft 21, the hollow main shaft 21 in a cylinder shape is arranged in a central through hole 51 of the middle rotary drum 10, the central lines of the worm 27 and the worm gear assembly 20 are overlapped, a section of outer wall of the hollow main shaft 21 close to a first end (the left end in figures 3 and 4) in the two ends is connected with a through hole main shaft bearing 15 between the inner walls of the middle rotary drum 10, the circular worm gear assembly 20, the circular transmission ring 19, the circular follower ring 17 and the circular friction ring 16 are all sleeved on a section of outer wall of the hollow main shaft 21 close to a second end (the right end in figures 3 and 4) in the two ends through self central through holes and are arranged in parallel in the axial direction, the worm gear assembly 20 comprises a worm gear ring 34 and a first straight gear ring 36 which are arranged in parallel and are connected with a straight gear ring assembly 38, the straight gear ring 27 which is arranged in parallel with a straight gear ring 37, the outer wall of the worm gear assembly 20, the straight gear ring 27 is connected with a straight gear ring 37, the straight gear ring 20 which is connected with a straight gear ring 37, the straight gear ring 37 which is arranged in the straight gear ring 19 and a straight gear ring 19, the straight gear ring 19, a second straight gear ring 44 and a third straight gear ring 40 are respectively arranged at the positions, close to a central through hole 43, of two axial sides of the disc 39, a plurality of straight bar-shaped teeth 45 protruding towards the central line direction are uniformly arranged on the inner circumferential wall of the second straight gear ring 44, a plurality of straight bar-shaped teeth 41 protruding outwards are uniformly arranged on the outer circumferential wall of the third straight gear ring 40, the straight bar-shaped teeth 45 of the second straight gear ring 44 and the straight bar-shaped teeth 41 of the third straight gear ring 40 are both parallel to the axial direction of the central through hole 43 of the transmission ring 19, the second straight gear ring 44 is sleeved outside the first straight gear ring 36, the straight bar-shaped teeth 45 of the second straight gear ring 44 are meshed with the straight bar-shaped teeth 37 of the first straight gear ring 36, an internal thread 42 is arranged on the inner circumferential wall of the third straight gear ring 40, an external thread 32 is arranged at the position, corresponding to the third straight gear ring 40, on the outer wall of the hollow main shaft 21, and is connected with the internal thread 42 of the third straight gear ring 40 through the external thread 32, a plurality of straight strip-shaped teeth 48 protruding towards the central line direction are uniformly arranged on the circumferential inner wall of the follower ring 17, the straight strip-shaped teeth 48 are axially parallel to a central through hole 49 of the follower ring 17, the follower ring 17 is sleeved outside the third straight tooth ring 40 through the central through hole 49 of the follower ring 17, the straight strip-shaped teeth 48 of the follower ring 17 are meshed with the straight strip-shaped teeth 41 of the third straight tooth ring 40, a plurality of follower ring blind holes 47 are uniformly arranged on the circular ring surface at one side of the follower ring 17 close to the transmission ring 19, a plurality of transmission ring blind holes 46 are uniformly arranged on the circular disc 39 of the transmission ring 19 along the circumferential direction, two ends of a plurality of first pressure springs 18 are respectively arranged in the plurality of follower ring blind holes 47 and the plurality of transmission ring blind holes 46, the hole wall of the central through hole of the friction ring 16 is tightly contacted with the circumferential outer wall of the hollow main shaft 21, the circular ring surface at one side of the friction ring 16 is close to one side of the follower ring 17 far away from the transmission ring 19, the other side circular surface of the friction ring 16 is tightly contacted with the convex circular step surface on the circumferential outer wall of the hollow main shaft 21, and the first end of the hollow main shaft 21 is close to and connected with the clamping jaw mechanism.

In order to realize the reliable clamping function of a workpiece (not shown in the figure) and drive the middle rotary cylinder 10 to synchronously rotate, the clamping jaw mechanism comprises a plurality of clamping jaws 3, a plurality of pull rods 28, a plurality of pin shafts 29, a plurality of connecting screws (not marked in the figure), a plurality of driving screws 4 and a driving disc 2, the clamping jaws 3 are in the shape of isosceles triangle (also can be in the shape of isosceles triangle) and take one end of two base angles as a large end and one end of a vertex angle as a small end, the large ends of the clamping jaws 3 are respectively and rotatably connected with one ends of the pull rods 28 through the pin shafts 29, the other ends of the pull rods 28 are respectively and uniformly installed at the corresponding circular end part of the middle rotary cylinder 10, the small ends of the clamping jaws 3 are all close to the central line of the middle rotary cylinder 10 and jointly surround a circular clamping hole 33, a plurality of connecting screw is located the space between the main aspects of a plurality of pull rods 28 and a plurality of clamping jaws 3 respectively and is connected with the ring shape terminal surface of first end of hollow spindle 21 respectively, a plurality of drive screw 4 respectively with driving-disc 2 and a plurality of connecting screw's big end screwed connection, a plurality of clamping jaws 3 are located between the first end of driving-disc 2 and hollow spindle 21, a side surface that is close to hollow spindle 21 on the clamping jaw 3 is equipped with evagination clamping jaw sand grip 13, evenly is equipped with a plurality of main shaft recesses (not marked in the figure) along the circumferencial direction on the ring shape terminal surface of first end of hollow spindle 21, and a plurality of clamping jaw sand grip 13 are arranged in a plurality of respectively in the main shaft recess and can be in the main shaft recess slide behind a section circular arc distance by the cell wall of main shaft recess.

In order to facilitate the middle rotary drum 10 to be matched with a transmission mechanism to realize the function that the middle rotary drum 10 cannot rotate relative to the base 1 before the clamping jaw mechanism finishes the clamping function and can rotate relative to the base 1 after the clamping jaw mechanism finishes the clamping function, the clutch mechanism comprises a clutch ring 12, a clutch rod 26 and a second pressure spring 23, the annular clutch ring 12 is sleeved outside the middle rotary drum 10 through a central through hole 52 of the clutch ring 12 and is positioned in the through hole of the base, a plurality of radial clutch ring through holes (not marked in the figure) are uniformly arranged on the ring wall of the clutch ring 12 along the circumferential direction, a ball 11 is arranged in each clutch ring through hole, the outer diameter of the ball 11 is larger than the axial length of the clutch ring through hole, a plurality of rotary drum ball grooves 31 which are uniformly distributed along the circumferential direction and are strip-shaped in the axial direction of the middle rotary drum 10 are arranged on the circumferential outer wall of the middle rotary drum 10 corresponding to the plurality of balls 11 on the clutch ring 12, a plurality of first base ball grooves 7 which are uniformly distributed along the circumferential direction and are in a strip shape along the axial direction of the base through hole are arranged on the hole wall of the base through hole and correspond to the plurality of balls 11 on the clutch ring 12, a plurality of second base ball grooves 6 in the circumferential direction are arranged on the hole wall of the base through hole and correspond to the plurality of balls 11 on the clutch ring 12, the circular second base ball grooves 6 are respectively intersected with the middle sections of the plurality of first base ball grooves 7, the plurality of balls 11 on the clutch ring 12 are respectively and simultaneously arranged in the plurality of rotary cylinder ball grooves 31 and the plurality of first base ball grooves 7, a plurality of clutch ring convex blocks 25 which are uniformly distributed along the circumferential direction and are convex towards the central line direction of the clutch ring are arranged on the circumferential inner wall of the clutch ring 12, radial rotary cylinder blind holes 24 are respectively arranged on the circumferential outer wall of the middle rotary cylinder 10 and correspond to the plurality of clutch ring convex blocks 25, the plurality of clutch ring convex blocks 25 are respectively arranged in the plurality of rotary drum blind holes 24, the axial direction of the second pressure spring 23 is the same as the axial direction of the middle rotary drum 10, the plurality of second pressure springs 23 are arranged in the plurality of rotary drum blind holes 24, one end of the second pressure spring 23 is in contact with one end of the corresponding clutch ring convex block 25, the other end of the second pressure spring 23 is in contact with one end hole wall far away from the transmission ring 19 in the rotary drum blind hole 24, a plurality of axial rotary drum clutch holes 50 are uniformly arranged on the drum wall of the middle rotary drum 10 along the circumferential direction, one ends of the plurality of rotary drum clutch holes 50 are in one-to-one correspondence and communicated with the plurality of rotary drum blind holes 24, the other ends of the plurality of rotary drum clutch holes 50 extend to one end surface close to the transmission ring 19 on the middle rotary drum 10 and are opened, the plurality of clutch rods 26 are respectively arranged in the plurality of rotary drum clutch holes 50, one end of each clutch rod 26 is in contact with the other ends of the plurality of clutch ring convex blocks 25, and the other ends of each clutch rod 26 are close to the disc 39 of the disc transmission ring 19 and can be in contact with the disc 39 of the transmission ring 19.

In order to facilitate the installation of the rotary cylinder bearing 9 and facilitate the setting of the rotary cylinder blind hole 24, the middle section circumference outer wall of the middle rotary cylinder 10 protrudes towards the outer circumference direction to form a rotary cylinder convex ring 30, the rotary cylinder convex ring 30 is positioned between the two rotary cylinder bearings 9, the plurality of rotary cylinder blind holes 24 respectively pass through the rotary cylinder convex ring 30, and the plurality of rotary cylinder ball grooves 31 are arranged on the outer wall of the rotary cylinder convex ring 30.

In order to better position the clutch rod 26 and prevent the disc 39 of the transmission ring 19 from moving too far in the direction close to the intermediate rotary drum 10 to cause the disc to be separated from the first straight-tooth ring 36 of the worm gear assembly 20, an annular positioning ring 14 is arranged between the intermediate rotary drum 10 and the transmission ring 19, the positioning ring 14 is sleeved outside the follower ring 17 and the friction ring 16 through a central through hole of the positioning ring 14 and is not in contact with each other, the positioning ring 14 is connected with the corresponding end of the intermediate rotary drum 10, a plurality of positioning ring through holes (not marked in the figure) which are uniformly distributed in the circumferential direction and are axially through are arranged on the ring wall of the positioning ring 14, and the plurality of clutch rods 26 respectively pass through the plurality of positioning ring through holes.

Also shown in fig. 2 is a through hole 8 provided in the base 1 for the worm 27 to pass through for connection with the rotating shaft of the drive motor 5, which is of conventional adaptive construction.

As shown in fig. 1-10, in application, one end of a workpiece (not shown in the drawings) is placed in a clamping hole 33 defined by a plurality of clamping jaws 3, then the driving motor 5 is started, the driving motor 5 drives the worm 27 to rotate, the worm 27 drives the worm gear assembly 20 to rotate, so as to drive the transmission ring 19 and the follower ring 17 to synchronously rotate, so that no-load starting is realized, meanwhile, the clutch ring 12 is close to the transmission ring 19 under the action of the elastic force of the second pressure spring 23, and at this time, the balls 11 are simultaneously located in the ball groove 31 of the revolving drum and the ball groove 7 of the first base and are not located in the ball groove 6 of the second base, so that the intermediate revolving drum 10 cannot rotate relative to the base 1 under the action of the balls 11; under the action of a threaded connection structure of the transmission ring 19 and the hollow main shaft 21, the transmission ring 19 rotates and moves towards the direction close to the middle rotary cylinder 10, the follow-up ring 17 is extruded through the first pressure spring 18, the follow-up ring 17 extrudes the friction ring 16, a gradual loading process is realized, finally the hollow main shaft 21 is driven to synchronously rotate when the friction force is large enough, after the transmission ring 19 rotates for a certain time, the disc 39 of the transmission ring 19 pushes the clutch rod 26 to move towards the direction close to the second pressure spring 23 by overcoming the elastic force of the second pressure spring 23, the clutch ring bump 25 and the clutch ring 12 are driven to synchronously move towards the direction close to the clamping jaw mechanism until the balls 11 are positioned in the second base ball groove 6, at the moment, the balls 11 can rotate in the second base ball groove 6, and the middle rotary cylinder 10 can rotate relative to the base 1; meanwhile, the hollow main shaft 21 drives the plurality of clamping jaws 3 to rotate around the corresponding pin shafts 29 respectively, the clamping holes 33 shrink and become small, the clamping function of the workpiece is realized, after clamping, the middle rotary cylinder 10 is driven to synchronously rotate through the connecting structure and the connecting screws between the clamping jaws 3 and the hollow main shaft 21, the driving screws 4, the driving disc 2 and the pull rod 28, the purpose of rotationally driving the workpiece is realized, and finally, the function of synchronously rotating the transmission mechanism, the clamping jaw mechanism, the middle rotary cylinder 10 and the clutch mechanism through the driving motor 5 is realized.

After the work is finished, the workpiece needs to be taken down, the driving motor 5 is rotated reversely at the moment, the middle rotary cylinder 10 cannot rotate relative to the base 1 at the moment because the rotary cylinder bearing 9 is a one-way bearing, correspondingly, the pull rod 28, the driving disc 2, the connecting screw and the driving screw 4 cannot rotate, and the clamping jaw 3 can rotate reversely around the corresponding pin shaft 29 at the moment, so that the clamping hole 33 is enlarged, the workpiece is loosened, and the workpiece can be taken out; meanwhile, under the action of the threaded connection structure of the transmission ring 19 and the hollow main shaft 21, the transmission ring 19 reversely rotates and moves away from the middle rotary drum 10, the extrusion on the follow-up ring 17 and the friction ring 16 is released, the gradual load reduction process is realized, and finally the transmission ring is separated from the hollow main shaft 21 when the friction force is small enough, the hollow main shaft 21 stops rotating, and the whole mechanism is restored.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.

Claims

1. The utility model provides a two accuse formula centre gripping rotary driving mechanisms of single-drive, includes base, driving motor and clamping jaw mechanism, be equipped with radial cross-section on the base and be circular shape base through-hole, driving motor installs on the outer wall of base, clamping jaw mechanism is located the one end of base through-hole just can realize clamping function and be in under driving motor's the pivot rotary driving realize under driving motor's the reverse rotation of pivot drive and loosen function, its characterized in that: the single-drive double-control type clamping rotary driving mechanism further comprises a transmission mechanism, a clutch mechanism and a middle rotary cylinder, the middle rotary cylinder is arranged in the base through hole in a cylinder shape, the central lines of the middle rotary cylinder and the base through hole coincide with each other, the outer wall of the middle rotary cylinder and the hole wall of the base through hole are connected through a rotary cylinder bearing, the rotary cylinder bearing is a one-way bearing, the transmission mechanism is arranged in the base through hole and respectively connected with the rotating shaft of the driving motor and the clamping jaw mechanism, the clamping jaw mechanism is arranged at one end of the middle rotary cylinder, the clutch mechanism is arranged in the base through hole and respectively connected with the transmission mechanism and the middle rotary cylinder, and the clutch mechanism is used for enabling the middle rotary cylinder to be incapable of rotating relative to the base before the clamping jaw mechanism completes the clamping function and capable of rotating relative to the base after the clamping jaw mechanism completes the clamping function.

2. The single-drive dual-control clamping rotary drive mechanism of claim 1, wherein: the transmission mechanism comprises a worm, a worm wheel component, a transmission ring, a first pressure spring, a follower ring, a friction ring and a hollow main shaft, the hollow main shaft in a cylinder shape is arranged in a central through hole of the middle rotary drum, the central lines of the hollow main shaft and the hollow main shaft are mutually overlapped, a section of outer wall of the hollow main shaft close to the first end of the two ends is connected with the inner wall of the middle rotary drum through a through hole main shaft bearing, the annular worm wheel component, the annular transmission ring, the annular follower ring and the annular friction ring are sleeved on a section of outer wall of the hollow main shaft close to the second end of the two ends through a central through hole of the annular worm wheel component and are sequentially arranged in parallel in the axial direction, the worm wheel component comprises a worm wheel ring and a first straight-tooth ring which are arranged in parallel and are integrally formed, a plurality of outward-protruding worm teeth are uniformly arranged on the circumferential outer wall of the worm wheel ring and are meshed with the worm teeth on the worm through the plurality of worm teeth, the worm passes through the worm bearing and installs in the base through-hole and its axial with the axial mutually perpendicular of base through-hole, the one end of worm pass on the pore wall of base through-hole correspond the through-hole with driving motor's pivot is connected, evenly be equipped with the bar straight-tooth of a plurality of evaginations on the circumference outer wall of first straight-tooth ring and this bar straight-tooth is parallel to each other with the axial of the central through-hole of worm gear assembly, the central through-hole of worm gear assembly with be connected through worm gear assembly bearing between the outer wall of hollow spindle, the driving ring includes the disc that forms to radial outside circumferencial direction extension, the position that the axial both sides of disc are close to central through-hole is equipped with second straight-tooth ring and third straight-tooth ring respectively, evenly be equipped with a plurality of bar straight-teeth bellied to the central line direction on the circumference inner wall of second straight-tooth ring, the outer wall of the circumference of the third straight gear ring is uniformly provided with a plurality of convex straight teeth, the straight teeth of the second straight gear ring and the straight teeth of the third straight gear ring are parallel to each other in the axial direction of the central through hole of the transmission ring, the second straight gear ring is sleeved outside the first straight gear ring, the straight teeth of the second straight gear ring are meshed with the straight teeth of the first straight gear ring, the inner wall of the circumference of the third straight gear ring is provided with internal threads, the outer wall of the hollow main shaft, corresponding to the third straight gear ring, is provided with external threads and is connected with the internal threads of the third straight gear ring through the external threads, the inner wall of the circumference of the follow-up ring is uniformly provided with a plurality of convex straight teeth in the direction of the central line, and the straight teeth are parallel to each other in the axial direction of the central through hole of the follow-up ring, the servo ring is sleeved outside the third straight-tooth ring through a central through hole of the servo ring, a strip-shaped straight tooth of the servo ring is meshed with the strip-shaped straight tooth of the third straight-tooth ring, a plurality of servo ring blind holes are uniformly formed in an annular surface on one side, close to the transmission ring, of the servo ring, a plurality of transmission ring blind holes are uniformly formed in a surface, close to the servo ring, of a disc of the transmission ring along the circumferential direction, two ends of a plurality of first pressure springs are respectively arranged in the servo ring blind holes and the transmission ring blind holes, the wall of the central through hole of the friction ring is in close contact with the circumferential outer wall of the hollow main shaft, the annular surface on one side of the friction ring is close to one side, far away from the transmission ring, of the servo ring, and the annular surface on the other side of the friction ring is in close contact with an outward convex annular step surface on the circumferential outer wall of the hollow main shaft, the first end of the hollow main shaft is close to the clamping jaw mechanism and connected with the clamping jaw mechanism.

3. The single-drive dual-control clamping rotary drive mechanism of claim 2, wherein: the clamping jaw mechanism comprises a plurality of clamping jaws, a plurality of pull rods, a plurality of pin shafts, a plurality of connecting screws, a plurality of driving screws and a driving disc, wherein each clamping jaw is in an isosceles triangle or isosceles triangle shape, one end of each bottom angle of each clamping jaw is a large end, one end of each top angle of each clamping jaw is a small end, the large ends of the clamping jaws are respectively connected with one ends of the pull rods in a rotating mode through a plurality of pin shafts, the other ends of the pull rods are respectively and uniformly installed at the corresponding circular ring-shaped end parts of the middle rotary cylinder, the small ends of the clamping jaws are close to the central line of the middle rotary cylinder and are jointly surrounded by a circular clamping hole, the connecting screws are respectively located between the pull rods and the large ends of the clamping jaws and are respectively connected with the circular ring-shaped end face of the first end of the hollow spindle, the driving screws are respectively connected with the large end screw holes of the driving disc and the connecting screws, the clamping jaws are located between the driving disc and the first end of the hollow spindle, a plurality of the clamping jaws are provided with raised strips, one end faces of the hollow spindle, a plurality of raised strips are respectively provided with a plurality of grooves, and a plurality of circular main spindle grooves are uniformly arranged in the grooves, and a plurality of circular main spindle are uniformly arranged in the grooves in the circular arc grooves in the groove wall of the circular spindle.

4. The single-drive dual-control clamping rotary drive mechanism of claim 2 or 3, wherein: the clutch mechanism comprises a clutch ring, a clutch rod and a second pressure spring, the annular clutch ring is sleeved outside the middle rotary drum through a self central through hole and is positioned in the base through hole, a plurality of radial clutch ring through holes are uniformly arranged on the wall of the clutch ring along the circumferential direction, a ball is arranged in each clutch ring through hole, the outer diameter of each ball is larger than the axial length of the corresponding clutch ring through hole, a plurality of rotary drum ball grooves which are uniformly distributed along the circumferential direction and are in a strip shape in the axial direction of the middle rotary drum are arranged on the outer circumferential wall of the middle rotary drum at positions corresponding to the plurality of balls on the clutch ring, a plurality of first base ball grooves which are uniformly distributed along the circumferential direction and are in a strip shape in the axial direction of the base through hole are arranged on the hole wall of the base through hole at positions corresponding to the plurality of balls on the clutch ring, the hole wall of the base through hole is provided with a second base ball groove in the circumferential direction at a position corresponding to the balls on the clutch ring, the circular second base ball groove is respectively intersected with the middle sections of the first base ball grooves, the balls on the clutch ring are respectively and simultaneously arranged in the rotary cylinder ball grooves and the first base ball grooves, the circumferential inner wall of the clutch ring is provided with a plurality of clutch ring convex blocks which are uniformly distributed along the circumferential direction and are convex towards the central line direction of the clutch ring, the circumferential outer wall of the middle rotary cylinder is provided with radial rotary cylinder blind holes at positions corresponding to the clutch ring convex blocks, the clutch ring convex blocks are respectively arranged in the rotary cylinder blind holes, and the axial direction of the second pressure spring is the same as the axial direction of the middle rotary cylinder, the plurality of second pressure springs are arranged in the plurality of rotary cylinder blind holes, one end of each second pressure spring is in contact with one end of the corresponding clutch ring bump, the other end of each second pressure spring is in contact with the wall of one end, far away from the transmission ring, of each rotary cylinder blind hole, a plurality of axial rotary cylinder clutch holes are uniformly formed in the cylinder wall of the middle rotary cylinder in the circumferential direction, one ends of the rotary cylinder clutch holes are in one-to-one correspondence with the rotary cylinder blind holes and are communicated with the rotary cylinder blind holes, the other ends of the rotary cylinder clutch holes extend to the surface, close to the transmission ring, of one end of the middle rotary cylinder and are open, the plurality of clutch rods are respectively arranged in the rotary cylinder clutch holes, one ends of the plurality of clutch rods are respectively in contact with the other ends of the clutch ring bumps, and the other ends of the plurality of clutch rods are close to the discs of the transmission ring and can be in contact with the discs of the transmission ring.

5. The single-drive dual-control clamping rotary drive mechanism of claim 4, wherein: the middle section circumference outer wall of middle revolving drum is outside the protruding rotary drum bulge loop that forms of peripheral direction, the rotary drum bulge loop is located two between the revolving drum bearing, and a plurality of the revolving drum blind hole passes respectively the rotary drum bulge loop, and a plurality of the rotary drum ball groove is located on the outer wall of rotary drum bulge loop.

6. The single-drive dual-control clamping rotary drive mechanism of claim 4, wherein: middle revolving drum with be equipped with annular holding ring of circle between the driving ring, the holding ring is in through self central through-hole suit the follow-up ring with the outer and mutual contactless of friction ring, the holding ring with the corresponding end connection of middle revolving drum, be equipped with a plurality of holding ring through-holes that link up along circumferencial direction evenly distributed and axial on the rampart of holding ring, it is a plurality of the clutch lever passes a plurality ofly respectively the holding ring through-hole.