Clamping and centering device for ring workpieces

Abstract

The utility model provides a clamping and centering device for ring workpieces, and belongs to the technical field of metal part machining equipment. Comprising a workbench, a mounting table top is arranged on the workbench, an inner ring positioning mechanism and an outer ring positioning mechanism are arranged on the mounting table top, a mounting hole is coaxially formed in the mounting table top, a lifting seat is arranged in the workbench in a lifting mode, a movable seat is horizontally and movably arranged on the lifting seat, and the top end of the movable seat is higher than the mounting table top through the mounting hole; a first driving piece used for driving the lifting base to vertically ascend and descend is arranged in the workbench, the inner ring positioning mechanism is arranged at the top end of the movable base, and the outer ring positioning mechanism is arranged on the mounting table top. The inner ring is used for positioning the workpiece, the workpiece is jacked and lifted to be higher than the mounting table top, then the workpiece is centered, the friction force between the workpiece and the mounting table top is reduced, and the effect of protecting the workpiece and the mounting table top is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal part processing equipment, in particular to a clamping and centering device for ring-shaped workpieces. Background Art

[0002] The clamping and centering device is a kind of equipment commonly used in the processing of ring-shaped workpieces and is widely used in many fields of the manufacturing industry, such as aviation, aerospace, automobiles, construction machinery, etc. At present, circular ring parts are mostly processed on ordinary vertical lathes. The center of rotation is aligned by using a dial indicator with the outer circle or inner hole of the circular ring part. Such an alignment process requires adjusting the four jaws of the rotary table of the vertical lathe multiple times to gradually make the center of rotation of the circular ring part coaxial with the center of rotation of the vertical lathe. The result of such processing is restricted by the skills of the operator, so the processing accuracy is not ideal and the work efficiency is extremely low.

[0003] The patent with the publication number of CN202292174U discloses a clamping and centering device for ring-shaped workpieces, including a rotary table, a clamping and centering mechanism, a pressing and supporting mechanism, a power device, and a first driving device. The first driving device drives multiple sliding support arms and jaws in the clamping and centering mechanism to move centripetally or centrifugally in the radial direction of the rotary table, so as to realize the clamping and centering of the workpiece in the radial direction.

[0004] However, during the process of pushing the workpiece to move towards the center on the rotary table, the contact between the workpiece and the table surface of the rotary table is frictional. Especially when processing workpieces with a large mass, there is a large frictional force between the workpiece and the table surface of the rotary table. A large frictional noise will be generated during the positioning of the workpiece, and both the end face of the positioned workpiece and the table surface of the worktable will be severely worn. Summary of the Utility Model

[0005] In view of the above problems, the utility model provides a clamping and centering device for ring-shaped workpieces.

[0006] In order to achieve the above invention purpose, the technical scheme adopted by the utility model is as follows:

[0007] Provide a clamping and centering device for ring-shaped workpieces, including a worktable, an installation table surface is arranged on the worktable, an inner ring positioning mechanism and an outer ring positioning mechanism are arranged on the installation table surface, an installation hole is coaxially opened on the installation table surface, a lifting seat is arranged in the worktable in a lifting manner, a movable seat is horizontally movably arranged on the lifting seat, the top end of the movable seat protrudes above the installation table surface through the installation hole, a first driving member for driving the lifting seat to vertically lift is arranged in the worktable, the inner ring positioning mechanism is arranged at the top end of the movable seat, and the outer ring positioning mechanism is arranged on the installation table surface.

[0008] Further, the inner ring positioning mechanism includes multiple groups of movable lead screws, guide sleeves, and outer sleeves that are evenly spaced along the circumferential direction of the movable seat. The outer sleeve is fixedly arranged on the outer wall of the movable seat along the radial direction of the movable seat. The guide sleeve is rotatably arranged coaxially inside the outer sleeve. One end of the guide sleeve is fixedly connected with a driven bevel gear. A driving bevel gear is rotatably arranged coaxially inside the movable seat. The driving bevel gear meshes and drives with multiple driven bevel gears at the same time. A first driving motor is fixedly arranged at the bottom of the movable seat. The first driving motor is used to drive the driving bevel gear to rotate. The movable lead screw is coaxially and threadedly connected inside the outer sleeve. One end of the movable lead screw is coaxially and fixedly connected with a guide rod with a polygonal cross-section. The guide rod coaxially slides through one end of the guide sleeve away from the driven bevel gear. A contact head for abutting against the inner wall of the workpiece is rotatably arranged at the end of the movable lead screw away from the guide sleeve.

[0009] Further, an elastic layer is fixedly arranged on the surface of the contact head away from the movable lead screw.

[0010] Further, the first driving member includes a driving cylinder. The driving cylinder is fixedly arranged inside the workbench. The piston rod of the driving cylinder is vertically connected to the bottom of the lifting seat. Telescopic guide columns are arranged inside the workbench. One end of the telescopic guide column is connected to the workbench and the other end is connected to the lifting seat. Multiple telescopic guide columns are arranged at intervals along the circumferential direction of the workbench.

[0011] Further, a mounting plate is coaxially and fixedly arranged on the outer wall of the movable seat. A plurality of ball bearings are arranged on the top wall of the lifting seat. The mounting plate is in rolling contact with the ball bearings.

[0012] Further, the outer ring positioning mechanism includes multiple clamping blocks. A connecting groove is opened along the radial direction of the mounting tabletop. A driving disk is rotatably arranged coaxially inside the workbench. A planar thread is arranged on the top wall of the driving disk. The clamping block is slidably connected inside the connecting groove. The bottom end of the clamping block is threadedly connected to the driving disk. The top of the clamping block extends out of the connecting groove and is used to abut against the outer wall of the workpiece. A second driving motor for driving the driving disk to rotate is arranged inside the workbench.

[0013] The beneficial effects of the present utility model are as follows: When clamping a workpiece, the workpiece is placed on the workbench. First, the inner ring positioning mechanism abuts against the inner wall of the workpiece and drives the movable seat to move freely, so that the movable seat is coaxial with the workpiece. After the inner ring positioning mechanism clamps the workpiece tightly, the lifting seat lifts the movable seat and the workpiece, so that the workpiece is higher than the mounting tabletop. Then, the outer ring positioning mechanism positions the workpiece. At this time, the workpiece and the movable seat move freely to be coaxial with the workbench, thus completing the centering operation of the workpiece, reducing the friction between the workpiece and the mounting tabletop, and playing a protective role for both the workpiece and the mounting tabletop. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the clamping and centering device according to the embodiment of the present application.

[0015] Figure 2 This is a schematic diagram of a partial sectional structure of the clamping and centering device according to an embodiment of the present application.

[0016] Figure 3 It is Figure 2 a partially enlarged schematic diagram of part A in

[0017] Figure 4 This is an exploded structure schematic diagram of the movable lead screw and the guide sleeve according to an embodiment of the present application.

[0018] Wherein, 1. Workbench; 11. Installation tabletop; 2. Inner ring positioning mechanism; 21. Movable lead screw; 22. Guide sleeve; 23. Outer sleeve; 24. Driven bevel gear; 25. Driving bevel gear; 26. First driving motor; 27. Guide rod; 28. Contact head; 29. Elastic layer; 3. Outer ring positioning mechanism; 31. Block; 32. Connecting groove; 33. Second driving motor; 34. Driving disc; 4. Lifting seat; 41. Ball bearing; 5. Movable seat; 51. Installation piece; 6. Driving cylinder; 61. Telescopic guide post. Detailed implementation manners

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0020] An embodiment of the present application discloses a clamping and centering device for ring-shaped workpieces. Referring to Figure 1 , Figure 2 and Figure 3 , it includes a workbench 1. The top wall of the workbench 1 is provided with an installation tabletop 11 for placing workpieces. An inner ring positioning mechanism 2 and an outer ring positioning mechanism 3 are provided on the installation tabletop 11. The inner ring positioning mechanism 2 is used to center the workpiece on the inner side of the ring-shaped workpiece, and the outer ring positioning mechanism 3 is used to center the workpiece on the outer side of the ring-shaped workpiece. In the embodiment of the present application, an installation space is provided inside the workbench 1. An installation hole communicating with the installation space is coaxially opened on the installation tabletop 11. A lifting seat 4 is vertically lifted and installed in the installation space inside the workbench 1. A first driving member for driving the lifting seat 4 to vertically lift is provided inside the workbench 1. A movable seat 5 is provided on the workbench 1. The movable seat 5 is lapped on the lifting seat 4, and the movable seat 5 can move horizontally in any direction relative to the lifting seat 4. The top of the movable seat 5 extends upward from the installation hole, so that the top of the movable seat 5 is higher than the installation tabletop 11. The inner ring positioning mechanism 2 is arranged at the top end of the movable seat 5. The outer ring positioning mechanism 3 is arranged on the installation tabletop 11, and a movement gap for the horizontal movement of the movable seat 5 is left at the installation hole.

[0021] Specifically, a mounting piece 51 is coaxially and fixedly arranged on the outer wall of the movable seat 5, and a ball bearing 41 is fixedly installed on the top wall of the lifting seat 4. The ball bearings 41 are evenly arranged in an array on the upper top wall of the lifting seat 4, and the mounting piece 51 is in rolling contact with the ball bearings 41. The movable seat 5 is supported by the ball bearings 41, enabling the movable seat 5 to slide horizontally in any direction relative to the lifting seat 4. Specifically, when positioning a workpiece, after placing the workpiece on the mounting platform, the workpiece is first positioned by the inner centering mechanism. During the positioning process, the movable seat 5 will move automatically to keep itself concentric with the workpiece. Then, the first driving member will lift the lifting seat 4 and the movable seat 5, making the workpiece higher than the mounting table surface 11. Next, the outer ring positioning mechanism 3 will center the workpiece. During the centering process, both the workpiece and the movable seat 5 slide horizontally relative to the lifting seat 4, greatly reducing the friction force existing during the centering process of the workpiece and playing a protective role for the workpiece and the mounting table surface 11. After the workpiece is centered, the operator can choose to directly process the workpiece in the centered and clamped state, or first lower the lifting seat 4 and the workpiece, etc., and then re-position and clamp the workpiece by the outer ring positioning mechanism 3 before processing the workpiece.

[0022] Referring to Figure 4 , in the embodiment of the present application, the inner ring positioning mechanism 2 includes a plurality of movable lead screws 21, guide sleeves 22, and outer sleeves 23 that are evenly spaced along the circumferential direction of the movable seat 5. Among them, the outer sleeve 23 is fixedly arranged on the outer wall of the movable seat 5 along the radial direction of the movable seat 5. The inside of the outer sleeve 23 is hollow. The guide sleeve 22 is coaxially and rotatably installed inside the outer sleeve 23. One end of the guide sleeve 22 extends into the movable seat 5 and is coaxially and fixedly connected with a driven bevel gear 24. A driving bevel gear 25 is coaxially and rotatably installed inside the movable seat 5. The driving bevel gear 25 is meshed and driven with a plurality of driven bevel gears 24 at the same time. The driving bevel gear 25 is coaxially connected with a transmission shaft. A first driving motor 26 is fixedly installed at the bottom of the movable seat 5, and the output shaft of the first driving motor 26 is in transmission connection with the transmission shaft. The end of the guide sleeve 22 far from the driven bevel gear 24 is coaxially provided with a guide groove having a polygonal cross-section. The movable lead screw 21 is located on the side of the guide sleeve far from the driven bevel gear 24. The movable lead screw 21 is coaxially arranged in the outer sleeve 23. A guide rod 27 is coaxially fixedly connected to the end of the movable lead screw 21 close to the guide sleeve. The cross-sectional shape of the guide rod 27 is adapted to the shape of the guide groove. The guide rod 27 is movably inserted into the guide groove. A threaded hole adapted to the movable lead screw 21 is provided at the end of the outer sleeve 23 far from the movable seat 5. The outer sleeve 23 is in threaded connection with the movable lead screw 21.

[0023] When the first driving motor 26 starts, the driving bevel gear 25 drives a plurality of driven bevel gears 24 to rotate simultaneously. The guiding sleeve 22 connected to the driven bevel gear 24 drives the movable lead screw 21 to rotate accordingly. The movable lead screw 21 and the outer sleeve 23 are in threaded cooperation, so that the movable lead screw 21 expands and contracts relative to the outer sleeve 23. One end of the movable lead screw 21 away from the guiding sleeve 22 is rotatably installed with a contact head 28 for abutting against the inner wall of the workpiece. An elastic layer 29 is fixedly installed on the surface of the contact head 28 away from the movable lead screw 21 by means of bonding, clamping, etc. The elastic layer 29 can specifically be a rubber layer. When the contact head 28 abuts against the inner wall of the workpiece, the rubber layer can increase the friction between the workpiece and the contact head 28.

[0024] In the embodiment of the present application, a connection groove 32 is formed in the installation table surface 11 along its own radial direction. A plurality of connection grooves 32 are evenly spaced along the circumferential direction of the workbench 1. The outer ring positioning mechanism 3 includes a plurality of clamping blocks 31. The clamping blocks 31 correspond to each connection groove 32 one by one and are slidably connected in the connection groove 32. The connection groove 32 is vertically communicated with the installation space in the workbench 1. In the installation space in the workbench 1, a driving disk 34 is also coaxially rotatably installed. A flat thread is provided on the top wall of the driving disk 34. The bottom end of the clamping block 31 extends into the installation space and is in threaded connection with the flat thread on the driving disk 34. The top end of the clamping block 31 extends out of the connection groove 32. By rotating the driving disk 34, a plurality of clamping blocks 31 on the workbench 1 can move synchronously centripetally / centrifugally along the radial direction of the workbench 1, so that the clamping blocks 31 abut against the outer wall of the workpiece. A second driving motor 33 for driving the rotating disk to rotate is provided in the workbench 1. In the embodiment of the present application, a driven gear ring is coaxially arranged on the bottom wall of the driving disk 34. The second driving motor 33 is fixed on the workbench 1, and its output shaft is coaxially connected with a driving gear. The driving gear meshes with the driven gear ring for transmission.

[0025] In the embodiment of the present application, the first driving member can be a driving cylinder 6. The driving cylinder 6 is fixedly arranged in the workbench 1, and the piston rod of the driving cylinder 6 is vertically connected to the bottom of the lifting seat 4. Further, a telescopic guiding column 61 is arranged in the workbench 1. One end of the telescopic guiding column 61 is connected to the workbench 1, and the other end is connected to the lifting seat 4. A plurality of telescopic guiding columns 61 are arranged at intervals along the circumferential direction of the workbench 1. The telescopic guiding column 61 is specifically an inner rod and a sleeve coaxially sleeved. Through the telescopic guiding column 61, a guiding effect can be exerted on the movement of the lifting seat 4.

[0026] Further, a reinforcing rib is also arranged between the movable seat 5 and the mounting piece 51. A plurality of reinforcing ribs are evenly spaced along the circumferential direction of the movable seat 5. Through the reinforcing ribs, the connection stability between the mounting piece 51 and the movable seat 5 can be enhanced, and the supporting effect of the mounting piece 51 on the movable seat 5 can be improved.

[0027] Those skilled in the art should understand that although the preferred embodiments of the present invention have been described, once those skilled in the art know the basic creative concept, additional changes and modifications can be made to these embodiments. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A clamping and centering device for a ring-type workpiece, characterized in that: The invention comprises a workbench (1), wherein the workbench (1) is provided with a mounting table (11), wherein the mounting table (11) is provided with an inner ring positioning mechanism (2) and an outer ring positioning mechanism (3), wherein a mounting hole is coaxially provided on the mounting table (11), wherein a lifting seat (4) is provided in the workbench (1) for lifting and lowering, wherein a movable seat (5) is provided on the lifting seat (4) for horizontal movement, wherein the top end of the movable seat (5) is higher than the mounting table (11) through the mounting hole, wherein a first driving member for driving the lifting seat (4) to vertically lift and lower is provided in the workbench (1), wherein the inner ring positioning mechanism (2) is provided at the top end of the movable seat (5), and wherein the outer ring positioning mechanism (3) is provided on the mounting table (11).

2. A clamping and centering device for a ring-type workpiece according to claim 1, characterized in that: The inner ring positioning mechanism (2) comprises a plurality of groups of movable screw rods (21), guide sleeves (22) and outer sleeves (23) which are evenly spaced along the circumference of the movable seat (5); the outer sleeve (23) is fixedly arranged on the outer wall of the movable seat (5) along the radial direction of the movable seat (5); the guide sleeve (22) is coaxially rotatably arranged in the outer sleeve (23); one end of the guide sleeve (22) is fixedly connected to a driven bevel gear (24); a driving bevel gear (25) is coaxially rotatably arranged in the movable seat (5); the driving bevel gear (25) is simultaneously meshed with a plurality of driven bevel gears (24) for transmission. A first driving motor (26) is fixedly arranged at the bottom of the movable seat (5), and the first driving motor (26) is used to drive the active bevel gear (25) to rotate. The movable screw rod (21) is coaxially threadedly connected to the outer sleeve (23), and one end of the movable screw rod (21) is coaxially fixedly connected to a guide rod (27) with a polygonal cross section. The guide rod (27) is coaxially slidably penetrated through the end of the guide sleeve (22) away from the driven bevel gear (24), and the end of the movable screw rod (21) away from the guide sleeve (22) is rotatably provided with a butt joint (28) for butting against the inner wall of a workpiece.

3. A clamping and centering device for a ring-type workpiece according to claim 2, characterized in that: An elastic layer (29) is fixedly provided on a side of the abutment joint (28) away from the movable screw rod (21).

4. A clamping and centering device for a ring-type workpiece according to claim 1, characterized in that: The first driving member comprises a driving cylinder (6), the driving cylinder (6) is fixedly arranged in the workbench (1), the piston rod of the driving cylinder (6) is vertically connected to the bottom of the lifting seat (4), a telescopic guide column (61) is arranged in the workbench (1), one end of the telescopic guide column (61) is connected to the workbench (1), and the other end is connected to the lifting seat (4), and a plurality of telescopic guide columns (61) are arranged at intervals along the circumference of the workbench (1).

5. A clamping and centering device for a ring-type workpiece according to claim 4, characterized in that: A mounting plate (51) is coaxially fixedly arranged on the outer wall of the movable seat (5), and a plurality of ball bearings (41) are arranged on the top wall of the lifting seat (4), and the mounting plate (51) rolls in contact with the ball bearings (41).

6. A clamping and centering device for a ring-type workpiece according to any one of claims 1 to 5, characterized in that: The outer ring positioning mechanism (3) comprises a plurality of clamping blocks (31). A connecting groove (32) is provided on the mounting table surface (11) along its radial direction. A driving disk (34) is coaxially rotatably arranged in the workbench (1). The top wall of the driving disk (34) is provided with a planar thread. The clamping block (31) is slidably connected in the connecting groove (32). The bottom end of the clamping block (31) is threadedly connected to the driving disk (34). The top of the clamping block (31) extends out of the connecting groove (32) and is used to abut against the outer wall of the workpiece. A second driving motor (33) is provided in the workbench (1) for driving the driving disk (34) to rotate.

Images