Self-centering clamping device and clamping method for annular inner ring type workpiece

Abstract

The invention discloses a self-centering clamping device and method for an annular inner ring type workpiece, and relates to the technical field of workpiece machining. The self-centering clamping device comprises a supporting frame and a mounting base mounted above the supporting frame; the supporting part comprises a plurality of supporting columns which are connected to the upper surface of the mounting seat in a sliding manner; the bidirectional positioning and clamping mechanism comprises an inner supporting assembly and an outer clamping assembly; the inner supporting assembly comprises a plurality of inner supporting clamping jaws which are slidably connected to the upper surface of the mounting base, the outer clamping assembly comprises a plurality of outer clamping jaws which are slidably connected to the mounting base and penetrate through the mounting base to extend downwards, and the outer clamping jaws and the inner supporting clamping jaws are arranged around the center of the mounting base; the inner supporting clamping jaw and the outer supporting clamping jaw are arranged on the mounting base and can be driven by the driving part to do centering or separating movement in the direction of the central axis of the mounting base, the invention further discloses a corresponding clamping method, the bottom face of a workpiece is stably supported through the supporting part, and then the driving part drives the inner supporting clamping jaw and the outer clamping clamping jaw to achieve accurate positioning and clamping of the workpiece.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece processing, and more particularly to a self-centering clamping device and a clamping method for an annular inner ring workpiece. Background Art

[0002] Sand-cast ball valve blanks have large dimensional deviations and typically weigh several hundred kilograms. This, coupled with the complex pouring and riser structures, makes the design of sand-cast ball valve fixtures face the dual challenges of precise positioning and heavy load bearing. During the production and processing of sand-cast ball valves, the clamping device is a key component that ensures the ball valve can be accurately and stably fixed to the processing equipment. However, existing sand-cast ball valve clamping devices still have certain drawbacks:

[0003] First, existing clamping devices often use a single clamping method, such as fixing the ball valve only by clamping claws or clamping blocks; this single clamping method easily causes uneven force on the ball valve during the clamping process, resulting in offset or tilt, affecting subsequent processing accuracy and product quality.

[0004] Secondly, the clamping parts of the existing clamping devices are generally specially designed and are only suitable for valve bodies of specific sizes. They cannot adapt to sand-cast ball valves of different sizes. Ball valves of different sizes require different clamping devices for clamping, resulting in a waste of resources.

[0005] Therefore, how to provide a self-centering clamping device that can stably and efficiently clamp annular inner ring workpieces and can adapt to different sizes is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0006] In view of this, the present invention provides a self-centering clamping device and clamping method for annular inner ring workpieces, aiming to solve the above technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A self-centering clamping device for an annular inner ring workpiece, comprising a support frame and a mounting seat mounted above the support frame; and further comprising:

[0009] A support portion, the support portion comprising a plurality of support columns slidably connected to an upper surface of the mounting seat;

[0010] A bidirectional positioning clamping mechanism, the bidirectional positioning clamping mechanism comprising an inner support assembly and an outer clamping assembly; the inner support assembly comprising a plurality of inner support jaws slidably connected to the upper surface of the mounting seat, the outer clamping assembly comprising a plurality of outer clamping jaws slidably connected to the mounting seat and extending downward through the mounting seat, the plurality of outer clamping jaws and the plurality of inner support jaws being arranged around the center of the mounting seat;

[0011] The driving part includes a first driving part arranged on the top surface of the mounting seat, and a second driving part arranged on the top of the support frame, the first driving part is used to drive the inner support jaw of the inner support assembly, and the second driving part is used to drive the outer clamping jaw of the outer clamping assembly, and the inner support jaw and the outer clamping jaw can be driven by the first driving part and the second driving part respectively to perform centering or separation movement toward the central axis of the mounting seat.

[0012] Through the above technical solution, the present invention discloses a self-centering clamping device for annular inner ring workpieces, which realizes stable support of the bottom surface of the annular inner ring workpiece through the support part, and then drives the inner support jaw and the outer clamping jaw to perform centering or separation movement toward the central axis of the mounting seat through the first drive part and the second drive part, thereby realizing precise positioning and stable clamping of the annular inner ring workpiece; this structural setting enables the clamp to adapt to the clamping of annular inner ring workpieces of different sizes, improves the versatility and adaptability of the clamp, reduces the waste of resources caused by dimensional deviation, and enhances the stability and reliability of the clamping process; at the same time, through the layered design, the overall structural layout is made more compact and reasonable.

[0013] Preferably, in the aforementioned self-centering clamping device for annular inner ring workpieces, the first drive unit is configured to synchronously and equidistantly drive the plurality of inner support jaws in linear displacement. The ability of the first drive unit to synchronously and equidistantly drive the plurality of inner support jaws in linear displacement ensures that the inner support jaws can evenly support the inner wall of the workpiece, thereby improving the uniformity and precision of clamping.

[0014] Preferably, in the above-mentioned self-centering clamping device for annular inner ring workpieces, the first driving part includes a first driving member fixed above the mounting seat by a first bracket, and multiple groups of guide rail mechanisms driven simultaneously by the first driving member, each of the guide rail mechanisms includes a first guide rail and a rack; the first guide rail is fixed to the upper surface of the mounting seat and is located on the outside of the first driving member; a first slider is slidably connected to the first guide rail, and the inner support clamp is fixed on the first slider; the rack is fixed on the first slider, and the multiple racks of the multiple groups of the guide rail mechanisms are staggered so that they can all engage with the driving gear of the first driving member. By driving the four racks to move simultaneously by one driving gear, the four inner support clamps are driven to perform centering or separation movements synchronously toward the central axis of the mounting seat, ensuring precise positioning.

[0015] Preferably, the aforementioned self-centering clamping device for an annular inner ring workpiece further includes a second guide rail fixed to the upper surface of the mounting seat, the second guide rail being disposed on the other side of the first driving member relative to the first guide rail, a second slider being slidably connected to the second guide rail, and the second slider being fixedly connected to an end of the rack distal from the first slider. The second guide rail and the second slider correspond to the first guide rail, and the fixed connection between the second slider and the rack further stabilizes the movement of the inner support jaws, thereby enhancing the stability of the clamping device.

[0016] Preferably, in the aforementioned self-centering clamping device for annular inner ring workpieces, a base is fixed to the support frame, the middle portion of the base being fixedly connected to the lower surface of the mounting seat via a support block; a plurality of slide grooves are provided on the upper surface of the mounting seat, each of the slide grooves being located between two adjacent inner support jaws; a plurality of outer clamping jaws are slidably connected to the base, with their top ends correspondingly passing through the plurality of slide grooves; and the plurality of outer clamping jaws are synchronously and equidistantly linearly driven by the second driving unit between the plurality of outer clamping jaws and the base. This ensures that the outer clamping jaws can evenly clamp the outer wall of the workpiece, thereby improving the uniformity and accuracy of clamping.

[0017] Preferably, in the aforementioned self-centering clamping device for annular inner ring workpieces, the second drive unit includes a second drive member fixed to the base via a second bracket, and multiple sets of linear guide mechanisms simultaneously driven by the second drive member; each set of linear guide mechanisms includes a third guide rail and a lead screw; the third guide rail is fixed to the upper surface of the base and slidably connected to a third slider; both ends of the lead screw are rotatably connected to a support seat on the base; the outer side of the lead screw is threadedly connected to a sliding seat, which is fixed to the third slider; the outer clamping jaw is fixed to the upper surface of the sliding seat; the end of the lead screw toward the center of the base passes through the support seat connected thereto, and a driven bevel gear is fixed to the end; the multiple sets of linear guide mechanisms are circumferentially arranged on the base with the second drive member as the center, so that the multiple driven bevel gears are all meshed with the active bevel gear of the second drive member. The meshing of the lead screw and the driven bevel gear achieves precise control and synchronous movement of the multiple outer clamping jaws.

[0018] Preferably, in the aforementioned self-centering clamping device for annular inner ring workpieces, the support column is positioned between the inner support jaw and the outer clamping jaw, and a third drive unit is used between the support column and the mounting seat to linearly drive the support column. Movement of the support column allows for adjustment of the support force on the workpiece bottom surface to accommodate workpieces of varying weights.

[0019] Preferably, in the aforementioned self-centering clamping device for an annular inner ring workpiece, the third driving portion includes a fourth guide rail and a fourth slider. The fourth guide rail is fixed to the upper surface of the mounting seat. The fourth slider is slidably connected to the fourth guide rail and fastened by bolts. The support column is fixed to the fourth slider. This achieves precise control and stable movement of the support column.

[0020] Preferably, the aforementioned self-centering clamping device for annular inner ring workpieces further includes an auxiliary positioning assembly, the auxiliary positioning assembly comprising a vertical rod, an L-shaped connecting plate, and a retaining rod. The vertical rod is vertically fixed to the upper surface of the mounting seat, the horizontal plate of the L-shaped connecting plate is slidably connected to the top of the vertical rod, the vertical plate of the L-shaped connecting plate is slidably connected to the vertical rod, the top of the vertical rod is slidably connected to the horizontal rod, and the retaining rod is fixed to the end of the upper surface of the horizontal plate. The auxiliary positioning assembly can further improve the positioning accuracy of the workpiece and ensure the stability of the workpiece during the clamping process.

[0021] The present invention also discloses a clamping method for clamping an annular inner ring workpiece body on a mounting seat above a support frame, specifically comprising the following steps:

[0022] First, the bottom surface of the annular inner ring workpiece body is supported by a plurality of support columns slidably connected to the upper surface of the mounting seat;

[0023] Then, the inner wall of the annular inner ring workpiece body is positioned using an inner support assembly provided on the mounting seat. The inner support assembly includes a plurality of inner support jaws slidably connected to the upper surface of the mounting seat. The inner wall of the annular inner ring workpiece body is supported on the inner side by adjusting the plurality of inner support jaws.

[0024] Finally, the outer wall of the annular inner ring workpiece body is clamped by using the outer clamping assembly provided on the mounting seat. The outer clamping assembly includes multiple outer clamping jaws slidably connected to the mounting seat. The outer side of the outer wall of the annular inner ring workpiece body is clamped by adjusting the multiple outer clamping jaws; the multiple outer clamping jaws and the multiple inner support jaws realize the clamping positioning on the inner and outer sides of the bottom edge of the annular inner ring workpiece body.

[0025] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a self-centering clamping device and clamping method for annular inner ring workpieces, which has the following beneficial effects:

[0026] The present invention realizes self-centering clamping of annular inner ring workpieces through the coordinated work of the inner support component and the outer clamping component, thereby improving the accuracy and reliability of clamping; the inner support jaws and the outer clamping jaws can accurately position and clamp the inner and outer walls of the workpiece, ensuring the position stability of the workpiece during processing; the first drive part and the second drive part can realize synchronous equidistant linear displacement driving of the inner support jaws and the outer clamping jaws, ensuring uniform distribution of clamping force, and at the same time can clamp annular inner ring workpieces of different sizes, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 The accompanying drawing is an axonometric view of the self-centering clamping device for a sand-cast ball valve provided by the present invention;

[0029] Figure 2 The accompanying drawing is a top view of the self-centering clamping device of the sand-cast ball valve provided by the present invention;

[0030] Figure 3 The accompanying drawing is a schematic structural diagram of the mounting base and the inner support assembly provided by the present invention;

[0031] Figure 4 The accompanying drawing is a front view of the self-centering clamping device of the sand-cast ball valve provided by the present invention;

[0032] Figure 5 The accompanying drawing is a schematic structural diagram of the base and the outer clamping assembly provided by the present invention;

[0033] Figure 6 The accompanying drawing is a schematic structural diagram of the mounting base and the auxiliary positioning assembly provided by the present invention;

[0034] Figure 7 The accompanying drawing is a schematic structural diagram of the sand-cast ball valve provided by the present invention being clamped on the device.

[0035] in:

[0036] 1-support frame;

[0037] 11-base; 12-support block;

[0038] 2-Mounting seat;

[0039] 21-chute;

[0040] 3- support part;

[0041] 31- support column;

[0042] 4-Inner support assembly;

[0043] 41- inner support assembly;

[0044] 5-External clamp assembly;

[0045] 51-external clamping jaws;

[0046] 6-first driving unit;

[0047] 61-first driving member; 611-driving gear; 612-first driving motor; 62-guide rail mechanism; 621-first guide rail; 622-rack; 63-first slider; 64-first bracket; 65-second guide rail; 651-second slider;

[0048] 7- second driving unit;

[0049] 71 - second driving member; 711 - driving bevel gear; 712 - second driving motor; 72 - linear guide mechanism; 721 - third guide rail; 722 - lead screw; 723 - sliding seat; 724 - driven bevel gear; 725 - support seat; 73 - third slider; 74 - second bracket;

[0050] 8- third driving unit;

[0051] 81-fourth guide rail; 82-fourth slider;

[0052] 9- auxiliary positioning component;

[0053] 91-vertical pole; 92-L-shaped connecting plate; 93-blocking rod; 94-vertical rod; 95-horizontal rod. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] Participate in the Figure 1-7 The embodiment of the present invention discloses a self-centering clamping device for an annular inner ring type workpiece, comprising a support frame 1 and a mounting seat 2 mounted above the support frame 1; and further comprising:

[0056] The support portion 3 includes a plurality of support columns 31 slidably connected to the upper surface of the mounting base 2;

[0057] The bidirectional positioning clamping mechanism includes an inner support assembly 4 and an outer clamping assembly 5; the inner support assembly 4 includes a plurality of inner support jaws 41 slidably connected to the upper surface of the mounting base 2, and the outer clamping assembly 5 includes a plurality of outer clamping jaws 51 slidably connected to the mounting base 2 and extending downward through the mounting base 2. The plurality of outer clamping jaws 51 and the plurality of inner support jaws 41 are arranged around the center of the mounting base 2;

[0058] The driving part includes a first driving part 6 provided on the top surface of the mounting seat 2, and a second driving part 7 provided on the top of the support frame 1. The first driving part 6 is used to drive the inner support jaw 41 of the inner support assembly 4, and the second driving part 7 is used to drive the outer clamping jaw 51 of the outer clamping assembly 5. The inner support jaw 41 and the outer clamping jaw 51 can perform centering or separation movements toward the central axis of the mounting seat 2 under the drive of the first driving part 6 and the second driving part 7 respectively.

[0059] In order to further optimize the above technical solution, the first driving part 6 is used to realize synchronous equidistant linear displacement driving of the multiple inner supporting jaws 41.

[0060] In order to further optimize the above technical solution, the first driving part 6 includes a first driving member 61 fixed above the mounting seat 2 by a first bracket 64, and multiple sets of guide rail mechanisms 62 driven simultaneously by the first driving member 61, each set of guide rail mechanisms 62 includes a first guide rail 621 and a rack 622; the first guide rail 621 is fixed to the upper surface of the mounting seat 2 and is located on the outside of the first driving member 61; a first slider 63 is slidably connected to the first guide rail 621, and the inner support clamp 41 is fixed on the first slider 63; the rack 622 is fixed on the first slider 63, and the multiple racks 622 of the multiple sets of guide rail mechanisms 62 are arranged in an staggered manner so that they can all engage with the driving gear 611 of the first driving member 61.

[0061] In order to further optimize the above technical solution, it also includes a second guide rail 65 fixed to the upper surface of the mounting base 2. The second guide rail 65 is arranged on the other side of the first driving member 61 relative to the first guide rail 621. A second slider 651 is slidably connected to the second guide rail 65. The second slider 651 is fixedly connected to the end of the rack 622 away from the first slider 63.

[0062] In order to further optimize the above technical solution, the first guide rail 621, the second guide rail 65, the rack 622, the first slider 63 and the second slider 651 form a set of driven structures that can fully engage with the driving gear 611. In this embodiment, the arrangement position of the first guide rail 621 coincides with any diameter of the mounting seat 2, and the arrangement position of the second guide rail 65 is staggered with the first guide rail 621, that is, Figure 2As shown. Next, the driven structure is rotated 180° with the origin of the mounting seat 2, thus forming a second set of driven structures. At this time, the first guide rails 621 of the two driven structures coincide with the same diameter of the mounting seat 2, so that the two inner support jaws 41 are located on the same straight line. Assuming that the above two sets of driven structures are combined as a whole to form a one-way linear dual-drive structure, and then the one-way linear dual-drive structure is rotated 90° to obtain a second one-way linear dual-drive structure, the heights of the first slider 63 and the second slider 651 in the two sets of one-way linear dual-drive structures are set differently, so that the two sets of one-way linear dual-drive structures can be arranged in a staggered manner. The two sets of one-way linear dual-drive structures are combined to form a two-way linear dual-drive structure in the X-axis and Y-axis directions, thereby meeting the requirements for the installation and control of the four inner support jaws 41. At this time, the middle parts of the four racks 622 enclose a three-dimensional hollow gap, and the driving gear 611 is arranged in the gap and engages with the four racks 622 at the same time; it should be noted that the axial height of the driving gear 611 should meet the axial height of the hollow gap.

[0063] In order to further optimize the above technical solution, the first driving member 61 includes a first driving motor 612 and a driving gear 611; the first driving motor 612 is fixed on the first bracket 64, and its power output shaft is arranged in the direction of the mounting seat 2, and is connected to the driving gear 611 through a coupling.

[0064] In order to further optimize the above technical solution, a base 11 is fixed on the support frame 1, and the middle part of the base 11 is fixedly connected to the lower surface of the mounting seat 2 through a support block 12; a plurality of slide grooves 21 are provided on the upper surface of the mounting seat 2, and each slide groove 21 is located between two adjacent inner support jaws 41; a plurality of outer clamping jaws 51 are slidably connected to the base 11, and their top ends respectively pass through the plurality of slide grooves 21 in a one-to-one correspondence; the plurality of outer clamping jaws 51 and the base 11 are synchronously and equidistantly linearly displaced by a second driving part 7.

[0065] In order to further optimize the above technical solution, the second driving part 7 includes a second driving member 71 fixed to the base 11 by a second bracket 74, and multiple sets of linear guide rail mechanisms 72 driven simultaneously by the second driving member 71; each set of linear guide rail mechanisms 72 includes a third guide rail 721 and a screw rod 722; the third guide rail 721 is fixed to the upper surface of the base 11 and is slidably connected to the third slider 73, and both ends of the screw rod 722 are rotatably connected to the support seat 725 on the base 11, and the outer screw rod 722 is screwed to the left of the screw rod 722. The groove is connected to a sliding seat 723, which is fixed on the third slider 73, and the outer clamping claw 51 is fixed on the upper surface of the sliding seat 723. The end of the screw rod 722 toward the center of the base 11 passes through the support seat 725 connected thereto, and a driven bevel gear 724 is fixed to the end thereof. The multiple sets of linear guide mechanisms 72 are arranged circumferentially on the base 11 with the second driving member 71 as the center, so that the multiple driven bevel gears 724 are all engaged with the active bevel gear 711 of the second driving member 71. The specific arrangement is as follows Figure 5 shown.

[0066] In order to further optimize the above technical solution, the second driving member 71 includes a second driving motor 712 and an active bevel gear 711; the second driving motor 712 is fixed on the bottom wall of the second bracket 74, and its power output shaft passes through the bottom wall of the second bracket 74, is arranged toward the base 11, and is transmission-connected to the active bevel gear 711.

[0067] In order to further optimize the above technical solution, the support column 31 is located between the inner support jaw 41 and the outer clamping jaw 51 , and the support column 31 and the mounting seat 2 are linearly driven by the third driving part 8 .

[0068] In order to further optimize the above technical solution, the third driving part 8 includes a fourth guide rail 81 and a fourth slider 82. The fourth guide rail 81 is fixed on the upper surface of the mounting seat 2. The fourth slider 82 is slidably connected to the fourth guide rail 81 and fastened by bolts. The support column 31 is fixed on the fourth slider 82.

[0069] In order to further optimize the above technical solution, a handle is fixed on the fourth slider 82. When the support column 31 needs to be moved, the bolt is screwed to push the fourth slider 82 through the handle, and when it moves to the specified position, it is tightened by the bolt.

[0070] In order to further optimize the above technical solution, an auxiliary positioning component 9 is also included. The auxiliary positioning component 9 includes a vertical pole 91, an L-shaped connecting plate 92 and a blocking rod 93. The vertical pole 91 is vertically fixed on the upper surface of the mounting seat 2. The horizontal plate of the L-shaped connecting plate 92 is slidably connected to the top of the vertical pole 91. The vertical plate of the L-shaped connecting plate 92 is slidably connected to a vertical pole 94. The top of the vertical pole 94 is slidably connected to a horizontal pole 95. The blocking rod 93 is fixed to the end of the upper surface of the horizontal pole 95.

[0071] In this embodiment, taking the sand casting ball valve as an example, Figure 7 As shown, the method for clamping the sand-cast ball valve body on the mounting seat 2 above the support frame 1 specifically includes the following steps:

[0072] First, the bottom surface of the sand-cast ball valve body is supported by a plurality of support columns 31 slidably connected to the upper surface of the mounting seat 2;

[0073] Then, the inner wall of the sand-cast ball valve body is positioned using the inner support assembly 4 provided on the mounting seat 2. The inner support assembly 4 includes a plurality of inner support jaws 41 slidably connected to the upper surface of the mounting seat 2. The inner wall of the sand-cast ball valve body is supported internally by adjusting the plurality of inner support jaws 41.

[0074] Finally, the outer wall of the sand-cast ball valve body is clamped by using the outer clamping assembly 5 provided on the mounting seat 2. The outer clamping assembly 5 includes a plurality of outer clamping jaws 51 slidably connected to the mounting seat 2. The outer wall of the sand-cast ball valve body is clamped on the outside by adjusting the plurality of outer clamping jaws 51; the plurality of outer clamping jaws 51 and the plurality of inner support jaws 41 realize the clamping positioning on the inner and outer sides of the bottom edge of the sand-cast ball valve body.

[0075] In order to further optimize the above technical solution, the position of the auxiliary positioning component 9 can be adjusted to realize the positioning and limitation of the stop rod 93 and the pouring spout of the sand-cast ball valve body, thereby limiting the rotation of the sand-cast ball valve body around the Z-axis; of course, this process can be carried out after the multiple outer clamping jaws 51 are completed to clamp the outer wall of the sand-cast ball valve body on the outside; or after the multiple inner support jaws 41 support the inner wall of the sand-cast ball valve body on the inside, the stop rod 93 is used to achieve the limitation, and finally the multiple outer clamping jaws 51 are used to clamp the outer wall of the sand-cast ball valve body on the outside. The specific method can be determined according to different types of annular inner ring workpieces.

[0076] It should be pointed out that the present invention is not only applicable to the clamping of sand-cast ball valves, but also applicable to all annular inner ring-type workpieces of similar components.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0078] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A self-centering clamping device for an annular inner ring type workpiece, comprising a support frame (1) and a mounting seat (2) mounted above the support frame (1); characterized in that: Also includes: A support portion (3), the support portion (3) comprising a plurality of support columns (31) slidably connected to the upper surface of the mounting seat (2); A bidirectional positioning clamping mechanism, the bidirectional positioning clamping mechanism comprising an inner support component (4) and an outer clamping component (5); the inner support component (4) comprises a plurality of inner support clamping claws (41) slidably connected to the upper surface of the mounting seat (2), the outer clamping component (5) comprises a plurality of outer clamping claws (51) slidably connected to the mounting seat (2) and extending downward through the mounting seat (2), the plurality of outer clamping claws (51) and the plurality of inner support clamping claws (41) are arranged around the center of the mounting seat (2); A driving part, the driving part comprises a first driving part (6) arranged on the top surface of the mounting seat (2), and a second driving part (7) arranged on the top of the support frame (1), the first driving part (6) is used to drive the inner support jaw (41) of the inner support component (4), and the second driving part (7) is used to drive the outer clamping jaw (51) of the outer clamping component (5), and the inner support jaw (41) and the outer clamping jaw (51) can perform centering or separation movement towards the central axis direction of the mounting seat (2) under the drive of the first driving part (6) and the second driving part (7), respectively.

2. A self-centering clamping device for annular inner ring type workpiece according to claim 1, characterized in that: The first driving part (6) is used to realize synchronous equidistant linear displacement driving of the plurality of inner support clamping jaws (41).

3. A self-centering clamping device for annular inner ring type workpiece according to claim 2, characterized in that: The first driving part (6) comprises a first driving member (61) fixed on the upper side of the mounting seat (2) via a first bracket (64), and a plurality of guide rail mechanisms (62) driven simultaneously by the first driving member (61), each of the guide rail mechanisms (62) comprising a first guide rail (621) and a rack (622); the first guide rail (621) is fixed on the upper surface of the mounting seat (2) and is located on the outer side of the first driving member (61); a first slider (63) is slidably connected to the first guide rail (621), and the inner support clamping claw (41) is fixed on the first slider (63); the rack (622) is fixed on the first slider (63), and the plurality of racks (622) of the plurality of guide rail mechanisms (62) are arranged in a staggered manner so that they can all mesh with the driving gear (611) of the first driving member (61).

4. A self-centering clamping device for annular inner ring type workpiece according to claim 3, characterized in that: It also includes a second guide rail (65) fixed to the upper surface of the mounting seat (2); the second guide rail (65) is arranged on the other side of the first driving member (61) relative to the first guide rail (621); a second slider (651) is slidably connected to the second guide rail (65); the second slider (651) is fixedly connected to an end of the rack (622) away from the first slider (63).

5. A self-centering clamping device for annular inner ring type workpiece according to claim 1, characterized in that: A base (11) is fixed on the support frame (1), and the middle part of the base (11) is fixedly connected to the lower surface of the mounting seat (2) through a support block (12); a plurality of slide grooves (21) are provided on the upper surface of the mounting seat (2), and each of the slide grooves (21) is located between two adjacent inner support jaws (41); a plurality of outer clamping jaws (51) are slidably connected to the base (11), and their top ends respectively pass through the plurality of slide grooves (21) in a one-to-one correspondence; the plurality of outer clamping jaws (51) and the base (11) are synchronously and equidistantly linearly driven by the second driving part (7).

6. A self-centering clamping device for annular inner ring type workpiece according to claim 5, characterized in that: The second driving part (7) comprises a second driving member (71) fixed to the base (11) via a second bracket (74), and a plurality of groups of linear guide rail mechanisms (72) driven simultaneously by the second driving member (71); each group of the linear guide rail mechanisms (72) comprises a third guide rail (721) and a lead screw (722); the third guide rail (721) is fixed to the upper surface of the base (11) and is slidably connected to a third slider (73); both ends of the lead screw (722) are rotatably connected to a support seat (725) on the base (11); the outer side of the lead screw (722) is threadedly connected to a sliding member (73); The movable seat (723) is fixed on the third sliding block (73), the outer clamping claw (51) is fixed on the upper surface of the sliding seat (723), one end of the screw rod (722) facing the center of the base (11) passes through the supporting seat (725) connected thereto, and a driven bevel gear (724) is fixed on the end thereof, and a plurality of groups of the linear guide mechanisms (72) are circumferentially arranged on the base (11) with the second driving member (71) as the center, so that the plurality of driven bevel gears (724) are all meshed with the driving bevel gear (711) of the second driving member (71).

7. A self-centering clamping device for annular inner ring type workpiece according to claim 1, characterized in that: The support column (31) is located between the inner support clamp (41) and the outer clamp (51), and a third driving unit (8) is used between the support column (31) and the mounting seat (2) to realize linear displacement driving of the support column (31).

8. A self-centering clamping device for annular inner ring type workpiece according to claim 7, characterized in that: The third driving part (8) comprises a fourth guide rail (81) and a fourth slider (82); the fourth guide rail (81) is fixed to the upper surface of the mounting seat (2); the fourth slider (82) is slidably connected to the fourth guide rail (81) and fastened by bolts; and the support column (31) is fixed to the fourth slider (82).

9. A self-centering clamping device for annular inner ring type workpiece according to claim 1, characterized in that: It also includes an auxiliary positioning component (9), the auxiliary positioning component (9) includes a vertical rod (91), an L-shaped connecting plate (92) and a blocking rod (93), the vertical rod (91) is vertically fixed to the upper surface of the mounting seat (2), the horizontal plate of the L-shaped connecting plate (92) is slidably connected to the top of the vertical rod (91), the vertical plate of the L-shaped connecting plate (92) is slidably connected to a vertical rod (94), the top of the vertical rod (94) is slidably connected to a horizontal rod (95), and the blocking rod (93) is fixed to the end of the upper surface of the horizontal rod (95).

10. A clamping method for a self-centering clamping device for an annular inner ring type workpiece according to any one of claims 1 to 9, characterized in that: The method is used to clamp the annular inner ring workpiece body on a mounting seat (2) above a support frame (1), and specifically comprises the following steps: Firstly, the bottom surface of the annular inner ring workpiece body is supported by a plurality of support columns (31) slidably connected to the upper surface of the mounting seat (2); Then, the inner wall of the annular inner ring workpiece body is positioned by using an inner support assembly (4) arranged on the mounting seat (2), wherein the inner support assembly (4) comprises a plurality of inner support jaws (41) slidably connected to the upper surface of the mounting seat (2), and the inner wall of the annular inner ring workpiece body is supported on the inner side by adjusting the plurality of inner support jaws (41); Finally, the outer wall of the annular inner ring workpiece body is clamped by using an outer clamping assembly (5) arranged on the mounting seat (2). The outer clamping assembly (5) includes a plurality of outer clamping jaws (51) slidably connected to the mounting seat (2). The outer side of the outer wall of the annular inner ring workpiece body is clamped by adjusting the plurality of outer clamping jaws (51); the plurality of outer clamping jaws (51) and the plurality of inner support jaws (41) realize the clamping positioning on the inner and outer sides of the bottom edge of the annular inner ring workpiece body.

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