A rotary clamping device

Abstract

The present invention discloses a rotary clamping device. At least three axial cuts are provided at the outer extension end of the elastic chuck to form multiple split claws. The clamping and fixing are achieved through the relative convergence and separation of the multiple split claws. The rotating shaft is driven by a driving device to rotate, and synchronously drives the elastic chuck to rotate, thereby enabling the workpiece to rotate synchronously. An expansion sleeve is arranged inside the elastic chuck, and a clamping sleeve is arranged outside it. The expansion sleeve and the clamping sleeve are relatively fixed and driven to move axially through a telescopic device. The expansion sleeve and the clamping sleeve move axially in synchronization; when the clamping sleeve moves outward, it can gradually squeeze and converge the split claws, thereby clamping the workpiece. When the expansion sleeve moves inward, it can gradually expand the split claws, thereby loosening the workpiece; the present invention realizes rapid clamping and loosening by laterally moving the expansion sleeve and the clamping sleeve, and can make the clamped workpiece rotate synchronously. This device can automatically clamp and can still be used even when there is a large position error in the pick-and-place of the workpiece by the manipulator.

Description

Technical Field

[0001] The present invention relates to the technical field of fixture tooling, and more particularly to a rotary clamping device. Background Art

[0002] When performing operations such as cutting, polishing, and drilling on a workpiece, it is necessary to first clamp and position the workpiece before processing, and usually a three-jaw chuck is used for clamping;

[0003] A collet chuck clamping device is a cylindrical fixture used to install on a milling machine to hold a drill bit or a milling cutter. The collet chuck clamping device can accurately position and clamp a workpiece or a tool, resist torque and withstand cutting forces from multiple directions, quickly release the workpiece or the tool, ensure machining accuracy and avoid damage to the workpiece, and can work within a wide range of spindle speeds with only minimal clamping force loss.

[0004] In the field of automated machining, rotary machining parts or rotary assembly components are quickly and automatically picked up and placed by a manipulator, and there are large errors when the manipulator picks up and places a workpiece.

[0005] For those skilled in the art, how to design a rotary device that can automatically clamp and meet the situation of large errors when the manipulator picks up and places a workpiece is a technical problem that needs to be solved currently. Summary of the Invention

[0006] The present invention provides a rotary clamping device, which realizes quick clamping and expansion by laterally moving an expansion sleeve and a clamping sleeve, and can still be used when there are large errors in the clamping by the manipulator. The specific solution is as follows:

[0007] A rotary clamping device includes a collet chuck and a rotating shaft arranged coaxially. The collet chuck is cylindrical, and at least three axial cuts are provided at its outer extension end, so that the outer extension end of the collet chuck forms multiple split claws that can elastically deform; a driving device drives the collet chuck and the rotating shaft to rotate;

[0008] An expansion sleeve is arranged inside the collet chuck, and a clamping sleeve is arranged outside it. The expansion sleeve and the clamping sleeve are relatively fixed and are driven to move axially by a telescopic device; when the clamping sleeve moves outward, it can gradually squeeze and converge the split claws, and when the expansion sleeve moves inward, it can gradually separate the split claws.

[0009] Optionally, the expansion sleeve and the clamping sleeve are relatively fixed by connecting columns perpendicular to the axis direction; the connecting columns penetrate through the collet chuck.

[0010] Optionally, the rotating shaft is rotatably connected to a fixed seat through a rotary bearing, and the telescopic device is a cylinder, and the cylinder body of the cylinder is fixed on the fixed seat;

[0011] The telescopic end of the cylinder is connected to the clamping sleeve through an angular contact ball bearing.

[0012] Optionally, the rotating shaft penetrates through the fixed seat;

[0013] The driving device drives the rotating shaft to rotate through a belt, a synchronous belt or a chain.

[0014] Optionally, a piston connecting frame is fixedly arranged at the telescopic end of the cylinder, and the piston connecting frame penetrates through the fixed seat to connect the clamping sleeve.

[0015] Optionally, a guiding linear bearing for guiding the piston connecting frame is arranged on the fixed seat.

[0016] Optionally, an inclined surface for contacting the inner wall of the elastic chuck is arranged on the outer surface of the expanding sleeve, and an inclined surface for contacting the outer wall of the elastic chuck is arranged on the inner surface of the clamping sleeve.

[0017] The present invention provides a rotary clamping device, in which an elastic chuck and a rotating shaft are coaxially arranged. The elastic chuck is cylindrical, and at least three cuts are arranged at its outer extending end along the axial direction, so that the outer extending end of the elastic chuck forms multiple split claws capable of elastic deformation. Clamping and fixing are realized through the relative convergence and separation of the multiple split claws; the rotating shaft and the elastic chuck are driven by a driving device to rotate, and the elastic chuck is synchronously driven to rotate, so as to synchronously rotate the workpiece. An expanding sleeve is arranged inside the elastic chuck, and a clamping sleeve is arranged outside it. The expanding sleeve and the clamping sleeve are relatively fixed and are driven to move axially through a telescopic device, and the expanding sleeve and the clamping sleeve move axially synchronously; when the clamping sleeve moves outwards, it can gradually squeeze and converge the split claws to realize clamping, and when the expanding sleeve moves inwards, it can gradually separate the split claws to realize loosening; the rotary clamping device provided by the present invention realizes rapid clamping and loosening by laterally moving the expanding sleeve and the clamping sleeve, and can synchronously rotate the clamped workpiece. This device can automatically clamp and can still be used even when there is a large position error in the workpiece picking and placing by the manipulator. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1A It is a schematic structural diagram of the rotary clamping device provided by the present invention in the open state;

[0020] Figure 1BSchematic structural diagram of the clamping state of the rotary clamping device provided by the present invention;

[0021] Figure 2A Connection structure diagram of the cylinder and other components;

[0022] Figure 2B Overall structural diagram of the rotary clamping device provided by the present invention.

[0023] The figure includes:

[0024] Elastic chuck 1, rotating shaft 2, slewing bearing 21, expanding sleeve 3, clamping sleeve 4, angular contact bearing 41, connecting column 5, fixed seat 6, cylinder 61, piston connecting frame 62, guide cylinder 63. Detailed implementation manners

[0025] The core of the present invention is to provide a rotary clamping device, which realizes quick clamping and loosening by laterally moving the expanding sleeve and the clamping sleeve, can make the clamped workpiece rotate synchronously, can automatically clamp, and can still be used when there is a large position error in the workpiece picking and placing by the manipulator.

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the rotary clamping device of the present invention will be introduced in detail below in conjunction with the drawings and specific implementation manners.

[0027] As Figure 1A and Figure 1B shown, they are respectively schematic structural diagrams of the cooperation between the elastic chuck 1, the rotating shaft 2, the expanding sleeve 3, and the clamping sleeve 4 in the rotary clamping device provided by the present invention. Figure 1A Indicates the loosening state, Figure 1B Indicates the clamping state, and A in the figure represents the workpiece to be clamped.

[0028] The rotary clamping device of the present invention includes an elastic chuck 1 and a rotating shaft 2 arranged coaxially. The elastic chuck 1 is cylindrical, the rotating shaft 2 is inserted into the elastic chuck 1, and the rotating shaft 2 and the elastic chuck 1 can be connected by threads. The elastic chuck 1 and the rotating shaft 2 can relatively translate along the axial direction, and both can rotate synchronously. At least three axial cuts are provided at the outer extension end of the elastic chuck 1, so that the outer extension end of the elastic chuck 1 forms multiple split claws that can elastically deform. The split claws can elastically deform, converge or separate from each other; the rotating shaft 2 is driven by a driving device to rotate, and the rotating shaft 2 and the elastic chuck 1 rotate synchronously.

[0029] Inside the elastic chuck 1, there is a spreading sleeve 3, and outside the elastic chuck 1, there is a clamping sleeve 4. Both the spreading sleeve 3 and the clamping sleeve 4 are cylindrical. The elastic chuck 1 is located inside the clamping sleeve 4. The spreading sleeve 3 and the clamping sleeve 4 are relatively fixed, move synchronously, and are driven to move axially by a telescopic device. When the clamping sleeve 4 moves outward, it can gradually squeeze and converge the split claws. When the spreading sleeve 3 moves inward, it can gradually separate the split claws. The outward movement here refers to the side close to the workpiece to be clamped, that is, Figure 1A the left side in Figure 1A and the inward movement refers to the movement to the

[0030] right side in Figure 1A Before clamping the workpiece, as shown in Figure 1A , the spreading sleeve 3 and the clamping sleeve 4 are located on the right side. At this time, the tapered opening of the clamping sleeve 4 does not contact the elastic chuck 1, and the tapered opening of the spreading sleeve 3 contacts the inner hole of the elastic chuck 1. The split claws of the elastic chuck 1 remain in the spread state, and the space surrounded by the split claws is larger than the outer diameter of the workpiece, and the gap is very large. Therefore, the workpiece can be placed in the split claws within a large range, and even if there is a large error in the clamping by the manipulator, it can still be placed normally. As shown in Figure 1B , after the workpiece is placed, move the spreading sleeve 3 and the clamping sleeve 4 to the left. The tapered surface of the spreading sleeve 3 gradually stops contacting the inner hole of the elastic chuck 1, and the tapered surface of the clamping sleeve 4 gradually contacts the outer tapered surface of the elastic chuck, causing the split claws of the elastic chuck 1 to gather together, and the size surrounded by the split claws shrinks until it is slightly smaller than the outer diameter of the workpiece, clamping and fixing the workpiece. Drive the rotating shaft 2 to rotate through the driving device, and the elastic chuck 1 and the workpiece rotate together. The spreading sleeve 3 and the clamping sleeve 4 as a whole rotate together with the elastic chuck 1.

[0031] The rotary clamping device provided by the present invention realizes rapid clamping and loosening by horizontally moving the spreading sleeve 3 and the clamping sleeve 4, and can make the clamped workpiece rotate synchronously. This device can automatically clamp without manual operation and can still be used when there is a large position error in the workpiece picking and placing by the manipulator. Figure 2A It is the connection structure diagram of the cylinder 61 and other components; Figure 2B It is the overall structure diagram of the rotary clamping device provided by the present invention. On the basis of the above scheme, the spreading sleeve 3 and the clamping sleeve 4 of the present invention are relatively fixed by connecting columns 5 perpendicular to the axis direction. A plurality of connecting columns 5 are arranged circumferentially, and the connecting columns 5 are symmetrically distributed around the center; on the cylindrical side wall of the elastic chuck 1, there are waist-shaped long holes, and the connecting columns 5 penetrate through the elastic chuck 1. The connecting columns 5 respectively fix the spreading sleeve 3 and the clamping sleeve 4, fixing the two as a whole.

[0032] The rotating shaft 2 is rotatably connected to the fixed seat 6 through a rotary bearing 21. The rotary bearing 21 provides support for the rotating shaft 2, enabling the rotating shaft 2 to rotate relative to the fixed seat 6; as shown in Figure 2AAs shown, the telescopic device is a cylinder 61. The cylinder body of the cylinder 61 is fixed on the fixed seat 6. The telescopic end of the cylinder 61 is connected to the clamping sleeve 4 through an angular contact ball bearing 41. The angular contact ball bearing 41 can bear axial and radial forces simultaneously. The outer ring of the angular contact ball bearing 41 is relatively fixed to the bracket connected to the telescopic end of the cylinder 61, and the inner ring of the angular contact ball bearing 41 is relatively fixed to the clamping sleeve 4. By applying an axial force to the clamping sleeve 4 and the expanding sleeve 3 through the telescopic end of the cylinder 61, and through the design of the angular contact bearing 41, the cylinder 61 does not rotate accordingly.

[0033] Optionally, as Figure 2B shown, the rotating shaft 2 passes through the fixed seat 6, that is, the main part of the rotating shaft 2 is on the left side of the fixed seat 6 in the figure, while the cylinder 61 is located on the right side of the fixed seat 6. The telescopic end of the cylinder 61 passes through the fixed seat 6 and is relatively connected to the angular contact ball bearing 41.

[0034] Optionally, the main part of the rotating shaft 2 can be located on the right side of the fixed seat 6.

[0035] The driving device drives the rotating shaft 2 to rotate through a belt, a synchronous belt or a chain. The driving device is also arranged on the fixed seat 6. As Figure 2B shown, a runner is arranged on the part of the rotating shaft 2 extending to the right side of the fixed seat 6, and the runner is driven to rotate by a belt.

[0036] Specifically, a piston connecting frame 62 is fixedly arranged at the telescopic end of the cylinder 61. The piston connecting frame 62 passes through the fixed seat 6 and is connected to the clamping sleeve 4. The piston connecting frame 62 has multiple straight rods parallel to the axis, making the movement of the telescopic end of the piston more stable.

[0037] In order to further improve the stability of the movement of the piston connecting frame 62, a guide cylinder 63 (linear bearing) for guiding the piston connecting frame 62 is arranged on the fixed seat 6. The inner wall of the guide cylinder 63 contacts the outer wall of the guide rod of the piston connecting frame 62. The length of the guide cylinder 63 is greater than the thickness of the fixed seat 6, thereby preventing the piston connecting frame 62 from deflecting.

[0038] Based on any of the above technical solutions and their combinations, in the present invention, an inclined surface for contacting the inner wall of the elastic chuck 1 is arranged on the outer surface of the expanding sleeve 3, and an inclined surface for contacting the outer wall of the elastic chuck 1 is arranged on the inner surface of the clamping sleeve 4. The elastic chuck 1 is opened through the inclined surface structure arranged on the outer surface of the expanding sleeve 3, and the elastic chuck 1 is closed through the inclined surface arranged on the inner surface of the clamping sleeve 4. The inclined surfaces on the expanding sleeve 3 and the clamping sleeve 4 are conical surfaces, with a larger diameter at the outer end part and a smaller diameter at the inner end part.

[0039] In addition to providing the inclined surface structures on the expanding sleeve 3 and the clamping sleeve 4 respectively, the inclined surface structures can also be provided on the inner surface and the outer surface of the elastic chuck 1, or on the inner surface and the outer surface of the elastic chuck 1, the inner surface of the clamping sleeve 4, and the outer surface of the expanding sleeve 3. All these specific embodiments shall be included within the protection scope of the present invention.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotary clamping device, characterized in that, It includes an elastic chuck (1) and a rotating shaft (2) arranged coaxially. The elastic chuck (1) is cylindrical, and at least three axial incisions are provided at its outer extending end, so that the outer extending end of the elastic chuck (1) forms multiple split claws capable of elastic deformation; a driving device drives the elastic chuck (1) and the rotating shaft (2) to rotate; An expansion sleeve (3) is arranged inside the elastic chuck (1), and a clamping sleeve (4) is arranged outside it. The expansion sleeve (3) and the clamping sleeve (4) are relatively fixed and driven to move axially by a telescopic device; when the clamping sleeve (4) moves outwards, it can gradually squeeze and converge the split claws, and when the expansion sleeve (3) moves inwards, it can gradually separate the split claws; The expansion sleeve (3) and the clamping sleeve (4) are relatively fixed by a connecting column (5) perpendicular to the axial direction; the connecting column (5) penetrates through the elastic chuck (1) and is guided and translated by the elastic chuck (1); The rotating shaft (2) is rotatably connected to a fixed seat (6) through a slewing bearing (21), and the telescopic device is a cylinder (61), and the cylinder body of the cylinder (61) is fixed on the fixed seat (6); The telescopic end of the cylinder (61) is connected to the clamping sleeve (4) through an angular contact ball bearing (41).

2. The rotary clamping device according to claim 1, wherein, The rotating shaft (2) penetrates through the fixed seat (6); The driving device drives the rotating shaft (2) to rotate through a belt, a synchronous belt or a chain.

3. The rotary clamping device according to claim 1, characterized in that, A piston connecting frame (62) is fixedly arranged at the telescopic end of the cylinder (61), and the piston connecting frame (62) penetrates through the fixed seat (6) to connect the clamping sleeve (4).

4. The rotary clamping device according to claim 3, characterized in that, A guiding cylinder (63) for guiding the piston connecting frame (62) is arranged on the fixed seat (6).

5. The rotary clamping device according to any one of claims 1 to 4, characterized in that, An inclined surface for contacting the inner wall of the elastic chuck (1) is arranged on the outer surface of the expansion sleeve (3), and an inclined surface for contacting the outer wall of the elastic chuck (1) is arranged on the inner surface of the clamping sleeve (4).

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