A three-jaw tooling suitable for closed impellers

Abstract

The application discloses a three-jaw tool suitable for a closed impeller and relates to the technical field of machining, which comprises a chuck, three clamping jaws are equidistantly arranged on the chuck along the circumferential direction of the chuck, a sliding block is slidably arranged on one side of each clamping jaw close to the center of the chuck, a driving assembly is arranged on each clamping jaw, the driving assembly is used for driving the sliding block to extend out of the clamping jaw and to be clamped into the flow channel of the impeller, and the upper and lower sides of the sliding block close to one end of the impeller are formed with chamfers, and the chamfers on the upper and lower sides of the sliding block are respectively in abutment with the front cover plate and the rear cover plate of the impeller. The application firstly uses the three sliding blocks to preliminarily position the impeller, and then uses the clamping jaws to finally position the impeller, so that the error of the perpendicularity between the center line of the flow channel and the rotation center line of the impeller is reduced, the consistency of the wall thickness of the flow channel of the finished impeller after machining is higher, and the yield of products is improved.

Description

Technical Field

[0001] This application relates to the field of machining technology, and in particular to a three-jaw tool suitable for closed impellers. Background Technology

[0002] Closed-type casting impellers have a front cover plate and a rear cover plate structure, with a flow channel between the front cover plate and the rear cover plate. As a key core component of high-speed machinery such as centrifugal compressors, the turning and boring processes of closed-type impellers are currently generally performed by directly clamping the outer circle of the casting blank with a general hydraulic three-jaw chuck and using it as a rough reference for positioning.

[0003] However, due to draft angles and dimensional tolerances on the outer surface of the cast blank, even with control at the casting process level, the problems of circumferential width differences in the flow channel and twisting deformation of the cover plate are still unavoidable. Existing processing methods usually use the flow channel centerline as a reference, relying on manual fixing of the scriber to rotate the impeller and repeated tapping for fine adjustment to complete the alignment and positioning. This not only results in low clamping efficiency and poor alignment accuracy stability, but also makes it difficult to keep the flow channel centerline horizontal, forming a vertical angular deviation with the impeller rotation centerline. When the impeller rotates, the flow channel exhibits wavy undulations, causing uneven distribution of machining allowance in the axial direction of the front and rear cover plates, and deviations in the axial thickness of the cover plates. Ultimately, this leads to poor consistency in the wall thickness of the finished flow channel, inducing a large initial quality imbalance, resulting in failure of rotor dynamic balance verification, which has become the main process bottleneck restricting the improvement of product yield. Summary of the Invention

[0004] To improve the problem of poor wall thickness consistency in the finished flow channel of closed impellers, this application provides a three-jaw tooling suitable for closed impellers.

[0005] The three-jaw tooling for closed impellers provided in this application adopts the following technical solution: A three-jaw tooling suitable for closed impellers includes a chuck with three jaws evenly spaced along its circumference. Each jaw has a slider slidably mounted on its side near the center of the chuck. Each jaw has a drive assembly for driving the slider to extend out of the jaw and engage with the impeller's flow channel. The upper and lower sides of the slider near the impeller end are chamfered, and the chamfers on the upper and lower sides of the slider abut against the front and rear cover plates of the impeller, respectively.

[0006] By adopting the above technical solution, before the grippers clamp the impeller, three drive components are used to move three sliders. The ends of the three sliders are inserted into the impeller's flow channel. The chamfer at the top of the slider abuts against the front cover plate, and the chamfer at the bottom abuts against the rear cover plate, thereby leveling the flow channel centerline and ensuring that the flow channel centerline is in a horizontal state, making the flow channel centerline perpendicular to the impeller's rotation centerline. Then, the three grippers clamp and lock the impeller. The three sliders are used to initially position the impeller, and then the grippers are used to finally position the impeller. This eliminates the wavy undulation phenomenon in the flow channel during impeller rotation, ensures uniform axial machining allowance of the front and rear cover plates, significantly reduces the axial thickness deviation of the cover plates, effectively reduces the initial imbalance generated after impeller machining, improves the impeller dynamic balance pass rate, and thus improves the product yield.

[0007] Preferably, the drive assembly includes a quick clamp, a push block, a push rod, a first elastic element, and a second elastic element. A groove is formed in the clamp, and the slider is slidably disposed within the groove. The quick clamp is disposed on the clamp, and the push rod is fixedly disposed on the moving end of the quick clamp, slidingly passing through the slider. The push block is fixedly disposed on the moving end of the quick clamp. The first elastic element is sleeved on the push rod and used to push the slider against the impeller. The second elastic element is sleeved on the slider and used to push the slider back into the clamp.

[0008] By adopting the above technical solution, a quick-clamping device drives the push block and push rod to move forward. The push rod moves forward within the slider, and the push block pushes the slider to move out of the clamp and abut against the impeller through the first elastic element. The slider also pushes the second elastic element to contract and deform. When the clamp moves to clamp the impeller, the slider can always be pressed against the impeller's flow channel under the elastic force of the first elastic element, so that the positioning effect of the slider remains stable. After the clamp has finished clamping, the impeller can be processed. After the impeller is processed, the quick-clamping device drives the push block and push rod to move backward. The second elastic element releases its elastic potential energy and pushes the slider back into the clamp, releasing the contact between the slider and the impeller, thus facilitating the removal of the finished impeller.

[0009] Preferably, the gripper has a first parallel planar wall at the end of the slide groove near the impeller, and the slider has a second parallel planar wall at the end of the slide groove near the impeller, with the two first planar walls abutting against the two second planar walls respectively.

[0010] By adopting the above technical solution, when the slider slides in the gripper, the two first plane walls abut against the two second plane walls, thereby limiting the movement of the slider and preventing it from deflecting during movement, thus enabling the slider to accurately position the impeller.

[0011] Preferably, the gripper includes a female gripper body and a female gripper body. The female gripper body is disposed on the chuck, and the female gripper body is adjustablely disposed on the female gripper body. The sliding groove is formed in the female gripper body. The side of the female gripper body near the impeller has an arc-shaped wall. The arc-shaped wall of the female gripper body abuts against the impeller. The slider is slidably disposed in the female gripper body, and the drive assembly is disposed on the female gripper body.

[0012] By adopting the above technical solution, the chuck moves the female claw body through the female claw body. The arc-shaped wall of the female claw body abuts against the outside of the impeller, thereby clamping and positioning the impeller. The female claw body can be adjusted and installed on the female claw body, so that the position of the slider can be adjusted, thus making the tooling adaptable to clamping impellers of different diameters.

[0013] Preferably, the sub-claw body is detachably mounted on the mother claw body by bolts. A first positioning block and a second positioning block are fixedly mounted on the bottom wall of the sub-claw body. A first positioning groove is formed on the top wall of the mother claw body along the diameter direction of the chuck. A second positioning groove is formed on the top wall of the mother claw body along the direction parallel to the impeller tangent. Multiple second positioning grooves are spaced apart along the diameter direction of the chuck. The first positioning block is inserted into the first positioning groove, and the second positioning block is inserted into the second positioning groove.

[0014] By adopting the above technical solution, the child claw body is fixed to the mother claw body with bolts. The first positioning block on the child claw body is inserted into the first positioning groove of the mother claw body, and the second positioning block on the child claw body is inserted into the second positioning groove of the mother claw body. This positions the child claw body along the diameter and tangential direction of the impeller, making the child claw body more stably installed on the mother claw body.

[0015] Preferably, a T-shaped block is slidably disposed inside the moving end of the chuck along the diameter direction of the chuck, and the female claw body is detachably disposed on the T-shaped block by bolts. Two first racks are disposed at intervals at the bottom of the female claw body, and two second racks are disposed at intervals on the moving end of the chuck. The two first racks mesh with the two second racks, and the opposite side walls of the T-shaped block abut against the two first racks and the two second racks respectively.

[0016] By adopting the above technical solution, after adjusting the position of the female claw body, bolts are used to fix the female claw body on the T-block, thereby fixing the female claw body on the moving end of the chuck. The first rack and the second rack mesh, thereby positioning the female claw body along the diameter direction of the impeller. The side wall of the T-block abuts against the first rack and the second rack, thereby positioning the female claw body along the tangential direction of the impeller, making the female claw body more stably installed on the moving end of the chuck.

[0017] Preferably, a support member is provided on the top wall of the female claw body, and the support member is adjustablely arranged on the female claw body in the vertical direction, with the impeller placed at the top of the three support members.

[0018] By adopting the above technical solution, when clamping the impeller, the height of the support is first adjusted, and then the impeller is placed on top of the three support components, which facilitates the subsequent movement of the slider into the impeller's flow channel.

[0019] Preferably, two clamping blocks are slidably disposed at intervals on the side wall of the sub-claw body near the impeller, and the arc-shaped wall is formed on the clamping blocks. A third elastic element is disposed inside the sub-claw body, which is used to push the clamping blocks to move towards the impeller. Stopping blocks are slidably disposed on both sides of the sub-claw body located in the slide groove. A transmission assembly is disposed inside the sub-claw body, and the transmission assembly drives the clamping blocks and the stopping blocks to move. When the clamping blocks move towards the sub-claw body, the clamping blocks drive the stopping blocks to slide into the slide groove through the transmission assembly, and the stopping blocks block the movement of the slider.

[0020] By adopting the above technical solution, the claw body drives two clamping blocks to move. The arc-shaped wall of the clamping blocks contacts the impeller, and the claw body drives the clamping blocks to clamp the impeller. During the clamping process, the clamping blocks are pushed by the impeller towards the claw body. The clamping blocks drive the stop block to slide into the groove through the transmission component. At this time, the stop block blocks the slider, preventing the slider from returning to the claw body. With this configuration, the slider is locked in the claw body during the impeller processing, so that the slider can limit the impeller, making the impeller more stable during processing.

[0021] Preferably, the transmission assembly includes a transmission rod and a transmission block. The transmission rod is slidably disposed in the claw body. One end of the transmission rod is fixedly connected to the clamping block, and the other end of the transmission rod abuts against a third elastic element. The transmission block is fixedly disposed on the side wall of the transmission rod. A sliding hole is provided in the stop block, through which the transmission rod slides. A push groove is obliquely provided on the side wall of the stop block located in the sliding hole, and the transmission block is slidably disposed in the push groove.

[0022] By adopting the above technical solution, when the clamping block moves towards the direction of the sub-claw body, the clamping block drives the transmission rod to move, the transmission rod squeezes the third elastic element to contract and deform, and the transmission rod drives the transmission block to move in the push groove. During the movement of the transmission block in the push groove, the transmission block drives the stop block to move into the slide groove. When the clamping claw releases the impeller, the third elastic element pushes the transmission rod to move and reset, the transmission rod drives the transmission block to move and reset, and the transmission block then drives the stop block to slide out of the slide groove, so that the slider can retract normally into the sub-claw body.

[0023] Preferably, the clamping block includes a movable seat and a clamping seat. The movable seat is fixedly connected to the transmission rod, the arc-shaped wall is formed on the clamping seat, and the clamping seat is rotatably disposed within the movable seat.

[0024] By adopting the above technical solution, the claw body drives the moving seat and the clamping seat to move. The arc wall of the clamping seat contacts the impeller. When clamping impellers of different diameters, the moving seat can rotate inside the clamping seat so that the arc wall can face the impeller, thereby making the clamping block clamp the impeller more stable.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Before using sliders and grippers to hold the impeller, three drive components are used to move three sliders. The ends of the three sliders are inserted into the impeller's flow channel. The chamfer at the top of the slider abuts against the front cover plate, and the chamfer at the bottom abuts against the rear cover plate, thereby leveling the flow channel centerline and ensuring that the flow channel centerline is horizontal and perpendicular to the impeller's rotation centerline. Then, the three grippers clamp and lock the impeller. The three sliders are used to initially position the impeller, and then the grippers are used to finally position the impeller. This eliminates the wavy undulation of the flow channel during impeller rotation, ensures uniform axial machining allowance of the front and rear cover plates, significantly reduces the axial thickness deviation of the cover plates, effectively reduces the initial imbalance generated after impeller machining, improves the impeller dynamic balance pass rate, and thus improves the product yield. 2. With the aid of a drive assembly, a quick-release clamp drives a push block and a push rod to move forward. The push rod moves forward within the slider, and the push block, through a first elastic element, pushes the slider to slide out of the clamp and abut against the impeller. Simultaneously, the slider pushes a second elastic element to contract and deform. When the clamp moves to hold the impeller, the slider remains firmly pressed against the impeller's flow channel under the elastic force of the first elastic element, ensuring stable positioning. After the clamp completes its gripping, the impeller can be processed. After processing, the quick-release clamp drives the push block and push rod to move backward. The second elastic element releases its elastic potential energy and pushes the slider back into the clamp, releasing the contact between the slider and the impeller, thus facilitating the removal of the finished impeller. 3. When clamping the impeller using the support components, first adjust the height of the support components, and then place the impeller on top of the three support components, so as to facilitate the subsequent movement of the slider into the impeller's flow channel. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the impeller being held by a three-jaw tool in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the overall structure of the three-jaw tooling in Embodiment 1 of this application; Figure 3 This is an exploded view of the overall structure of the three-jaw tooling in Embodiment 1 of this application; Figure 4 This is a partial structural cross-sectional view of the three-jaw tooling in Embodiment 1 of this application; Figure 5This is an exploded sectional view of a portion of the three-jaw tooling structure in Embodiment 1 of this application; Figure 6 This is an exploded view of part of the three-jaw tooling structure in Embodiment 1 of this application; Figure 7 This is a partial structural diagram of the three-jaw tooling in Embodiment 2 of this application; Figure 8 This is an exploded view of part of the three-jaw tooling structure in Embodiment 2 of this application; Figure 9 This is a partial structural cross-sectional view of the three-jaw tooling in Embodiment 2 of this application; Figure 10 This is a partial structural diagram of the three-jaw tooling in Embodiment 2 of this application, to highlight the transmission components.

[0027] Reference numerals: 1. Chuck; 2. Slider; 3. Gripper; 31. Female gripper body; 32. Female gripper body; 4. Drive assembly; 41. Quick clamp; 42. Push block; 43. Push rod; 44. First elastic element; 45. Second elastic element; 5. Impeller; 6. Flow channel; 7. Front cover plate; 8. Rear cover plate; 9. Chamfer; 10. Slide groove; 11. First flat wall; 12. Second flat wall; 13. Arc wall; 14. First positioning block; 15. Second positioning block; 16. 17. First positioning groove; 18. Second positioning groove; 19. T-block; 20. First rack; 21. Second rack; 22. Support member; 23. Clamping block; 24. Moving seat; 25. Clamping seat; 26. Third elastic member; 27. Stop block; 28. Transmission assembly; 29. ​​Transmission rod; 20. Transmission block; 21. Sliding hole; 22. Push groove; 23. Through hole; 24. Retaining ring; 35. Groove; 36. Rounded corner; 37. Guide block; 38. Guide groove. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-10 This application will be described in further detail.

[0029] This application discloses a three-jaw tooling suitable for closed impellers.

[0030] Example 1: Reference Figure 1 , Figure 2 and Figure 3 A three-jaw tooling suitable for closed impellers includes a chuck 1, with jaws 3 mounted on each of the three drive ends of the chuck 1. Each jaw 3 includes a female jaw body 32 and a female jaw body 31. The female jaw body 32 is mounted on the drive end of the chuck 1 by two bolts, and the female jaw body 31 is mounted on the female jaw body 32 by four bolts.

[0031] A nut is fixedly installed on the female claw body 32, and a support member 21 is slidably installed inside the female claw body 32 along the vertical direction. In this application, the support member 21 can be a bolt, and the nut is threaded through the support member 21. The impeller 5 is placed on the top of the three support members 21. By rotating the support member 21 before placing the impeller 5, the height of the top of the support member 21 can be adjusted, thereby adjusting the height of the impeller 5 after placement.

[0032] Reference Figure 3 , Figure 4 and Figure 5 The claw body 31 has an arc-shaped wall 13 on the side near the impeller 5. A groove 30 is vertically formed in the middle of the arc-shaped wall 13. A sliding groove 10 is formed inside the claw body 31 along the diameter of the chuck 1. A slider 2 is slidably mounted in the sliding groove 10. A drive assembly 4 is mounted on the claw body 31. The drive assembly 4 is used to drive the slider 2 to slide into or retract from the claw body 31.

[0033] Specifically, the drive assembly 4 includes a quick clamp 41, a push block 42, a push rod 43, a first elastic element 44, and a second elastic element 45. The quick clamp 41 is fixedly mounted on the side wall of the claw body 31 away from the impeller 5. The push block 42 is fixedly mounted on the moving end of the quick clamp 41 and is slidably mounted in the slide groove 10. The push rod 43 is fixedly connected to the push block 42. A through hole 28 is provided inside the slider 2 along its own length direction, and the end of the push rod 43 is slidably inserted into the through hole 28.

[0034] The first elastic element 44 is sleeved on the push rod 43, and its two ends abut against the push block 42 and the slider 2, respectively. The second elastic element 45 is sleeved on the slider 2, and a retaining ring 29 is formed on the outer wall of the slider 2 near the push block 42. The two ends of the second elastic element 45 abut against the retaining ring 29 and the end wall of the slide groove 10, respectively. In this application, both the first elastic element 44 and the second elastic element 45 can be selected as springs, and the elastic force of the first elastic element 44 is greater than that of the second elastic element 45.

[0035] When the quick-release clamp 41 is rotated downwards, it drives the push block 42 and push rod 43 forward. The push block 42 pushes the slider 2 through the first elastic element 44, causing the end of the slider 2 to extend out of the claw body 31. The slider 2 also drives the retaining ring 29 to squeeze the second elastic element 45. When the quick-release clamp 41 is rotated upwards, it drives the push block 42 and push rod 43 backwards. The second elastic element 45 releases its elastic potential energy and pushes the slider 2 back into the claw body 31 through the retaining ring 29.

[0036] Both the upper and lower sides of the slider 2 near the impeller 5 have chamfers 9. The opposite sides of the outer wall of the slider 2 have first planar walls 11 formed along parallel directions, and the opposite sides of the inner wall of the groove 10 near the impeller 5 have second planar walls 12 formed along parallel directions. During the movement of the slider 2 within the groove 10, the two first planar walls 11 and the second planar walls 12 are in contact with each other, preventing the two chamfers 9 at the ends of the slider 2 from rotating during movement.

[0037] When clamping the impeller 5, first place the impeller 5 on the three support members 21, then rotate the three quick clamps 41 downwards, causing the three sliders 2 to slide out of the three sub-jaw bodies 31. Subsequently, the chuck 1 drives the three jaws 3 to move towards the impeller 5, and the ends of the three sliders 2 are respectively inserted into the flow channel 6 of the impeller 5. Using the chamfers 9 at the top and bottom of the sliders 2, they form normal contact with the front cover plate 7 and the rear cover plate 8 of the impeller 5, respectively, thereby leveling the center line of the flow channel 6 and ensuring that the center line of the flow channel 6 is in a horizontal state, so that the center line of the flow channel 6 remains perpendicular to the rotation center line of the impeller 5.

[0038] As the gripper 3 continues to move, the impeller 5 generates a pushing force on the slider 2, which is greater than the elastic force of the first elastic element 44, thereby gradually pushing the slider 2 into the sub-gripper body 31. Under the continuous elastic force of the first elastic element 44, during the process of the slider 2 retracting into the sub-gripper body 31, the chamfer 9 at the end of the slider 2 always closely abuts against the impeller 5, thereby ensuring that the positioning reference does not shift during the clamping process of the gripper 3 and maintaining the stability of the pre-positioning accuracy.

[0039] When the arc-shaped wall 13 of the claw body 31 abuts against the impeller 5, the claw 3 can finally clamp and lock the impeller 5. After the impeller 5 is processed, the quick clamp 41 is rotated upward to drive the push block 42 and push rod 43 to retract. At this time, the second elastic element 45 releases the stored elastic potential energy, pushing the slider 2 to move and retract into the claw body 31, so that the slider 2 is disengaged from the impeller 5, thereby providing clearance space for the interference-free removal of the finished impeller 5.

[0040] Reference Figure 3 and Figure 6 Two first positioning blocks 14 are fixedly installed at intervals along the diameter direction of the chuck 1 at the bottom of the male claw body 31, and two second positioning blocks 15 are fixedly installed at intervals along the tangent direction parallel to the chuck 1 at the bottom of the male claw body 31. A first positioning groove 16 is formed at the top of the female claw body 32 along the diameter direction of the chuck 1, and a second positioning groove 17 is formed at the top of the female claw body 32 along the tangent direction parallel to the chuck 1. Four second positioning grooves 17 are formed at equal intervals along the diameter direction of the chuck 1, and all four second positioning grooves 17 are connected to the first positioning grooves 16.

[0041] When the child claw body 31 is fixedly mounted on the mother claw body 32 by four bolts, the two first positioning blocks 14 at the bottom of the child claw body 31 are inserted into the first positioning groove 16 of the mother claw body 32, and the second positioning block 15 is inserted into the second positioning groove 17. This reinforces the child claw body 31 along the diameter and tangential direction of the chuck 1, making the child claw body 31 more stable on the mother claw body 32. At the same time, by inserting the second positioning block 15 into the second positioning groove 17 at different positions, the installation position of the child claw body 31 can be adjusted, so that the gripper 3 can be used for impellers 5 of different diameters.

[0042] Two T-blocks 18 are slidably mounted at intervals along their diameter inside the moving end of the chuck 1. A female claw body 32 is fixedly mounted on the two T-blocks 18 by two bolts. Two first racks 19 are fixedly mounted at intervals on the bottom of the female claw body 32, with their adjacent sidewalls abutting against the two planar walls on either side of the T-blocks 18. Two second racks 20 are fixedly mounted at intervals on the moving end of the chuck 1, with their adjacent sidewalls abutting against the two planar walls on either side of the T-blocks 18, and the two first racks 19 mesh with the two second racks 20.

[0043] When the female claw body 32 is mounted on the moving end of the chuck 1 via two T-blocks 18, the first rack 19 and the second rack 20 mesh, thereby reinforcing the female claw body 32 along the diameter direction of the chuck 1. The first rack 19 and the second rack 20 abut against the T-blocks 18, thereby reinforcing the female claw body 32 along the tangential direction of the chuck 1, making the female claw body 32 more stably mounted on the moving end of the chuck 1. At the same time, by moving the female claw body 32 on the moving end of the chuck 1, the mounting position of the female claw body 32 can be adjusted, further expanding the applicability of the gripper 3 to impellers 5 of different diameters.

[0044] The implementation principle of a three-jaw tooling applicable to a closed impeller in this embodiment of the application is as follows: When clamping the impeller 5, the impeller 5 is first placed on three support members 21, and then the three quick clamps 41 are rotated downwards, causing the three sliders 2 to slide out of the three sub-jaw bodies 31. Subsequently, the chuck 1 drives the three jaws 3 to move towards the impeller 5, and the ends of the three sliders 2 are respectively inserted into the flow channel 6 of the impeller 5. Using the chamfers 9 at the top and bottom of the sliders 2, they form normal contact with the front cover plate 7 and the rear cover plate 8 of the impeller 5, thereby leveling the center line of the flow channel 6, ensuring that the center line of the flow channel 6 is in a horizontal state, and keeping the center line of the flow channel 6 perpendicular to the rotation center line of the impeller 5.

[0045] As the gripper 3 continues to move, the impeller 5 generates a pushing force on the slider 2, which is greater than the elastic force of the first elastic element 44, thereby gradually pushing the slider 2 into the sub-gripper body 31. Under the continuous elastic force of the first elastic element 44, during the process of the slider 2 retracting into the sub-gripper body 31, the chamfer 9 at the end of the slider 2 always closely abuts against the impeller 5, thereby ensuring that the positioning reference does not shift during the clamping process of the gripper 3 and maintaining the stability of the pre-positioning accuracy. When the arcuate wall 13 of the sub-gripper body 31 abuts against the impeller 5, the gripper 3 can finally clamp and lock the impeller 5.

[0046] Using slider 2 to pre-position impeller 5 effectively eliminates the initial deviation of impeller 5's clamping posture, providing a precise posture reference for the final positioning provided by gripper 3, thereby significantly reducing the levelness error of the machining end face, ensuring the uniformity of the machining allowance of the flow channel 6 wall thickness, and ultimately improving the dimensional consistency and yield of the finished impeller 5.

[0047] Example 2: Reference Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 is that each sub-claw body 31 is slidably mounted with a clamping block 22 at one end near the impeller 5 and on opposite sides of the groove 30. The clamping block 22 consists of a movable seat 221 and a clamping seat 222. The movable seat 221 is slidably mounted in the sub-claw body 31, and the clamping seat 222 is movably mounted in the movable seat 221.

[0048] An arc-shaped wall 13 is formed at the end of the clamping body 222 away from the movable body 221. Both ends of the clamping body 222 located along the arc of the arc-shaped wall 13 have rounded corners 33. Guide blocks 34 are fixedly installed at both the upper and lower ends of the clamping body 222. Arc-shaped guide grooves 35 are opened on both the upper and lower side walls of the inner cavity of the movable body 221. The two guide blocks 34 are slidably installed in the two guide grooves 35, thereby guiding the rotation of the clamping body 222.

[0049] The claw body 31 drives the two clamping blocks 22 to perform clamping actions. In order to adapt to impellers 5 of different diameters, the clamping seat 222 can rotate relative to the movable seat 221, so that the arc wall 13 automatically adjusts to the facing posture when it contacts the impeller 5, thereby ensuring that the clamping force is evenly distributed and improving the clamping stability.

[0050] Reference Figure 9 and Figure 10The claw body 31 has stops 24 slidably mounted on both sides of the slide groove 10 in the horizontal direction. Two transmission components 25 are installed inside the claw body 31, and each transmission component 25 is connected to the movable seat 221 and the stops 24 respectively. Specifically, the transmission component 25 includes a transmission rod 251 and two transmission blocks 252. The transmission rod 251 is slidably mounted inside the claw body 31, and one end of each transmission rod 251 is fixedly connected to the two movable seats 221. Two third elastic elements 23 are installed inside the claw body 31, and the other ends of the two transmission rods 251 abut against the two third elastic elements 23. In this application, the third elastic elements 23 can be springs.

[0051] Each of the two stop blocks 24 has a sliding hole 26 at one end that is far from each other, and the two transmission rods 251 slide through the two sliding holes 26 respectively. The four transmission blocks 252 are fixedly installed on the upper and lower side walls of the two transmission rods 251 respectively. The stop blocks 24 are inclinedly provided with push grooves 27 in the upper and lower side walls of the slider 2. The side of the push groove 27 away from the impeller 5 is inclined towards the slider 2, and the two transmission blocks 252 are slidably installed in the two push grooves 27 respectively.

[0052] The implementation principle of Embodiment 2 of this application is as follows: During the clamping process of the impeller 5, the reaction force of the impeller 5 on the clamping block 22 pushes the clamping block 22 to move towards the sub-claw body 31. The clamping block 22 drives the transmission rod 251 to move, compressing the third elastic element 23 to contract and deform and store energy. At the same time, the transmission rod 251 drives the transmission block 252 to slide in the push groove 27, thereby driving the stop block 24 to slide into the slide groove 10, forming a mechanical block on the slider 2, preventing the slider 2 from returning to the sub-claw body 31. This locking mechanism ensures that the slider 2 always remains in the extended state during the processing, maintaining its limiting effect on the impeller 5, thereby enhancing the positioning rigidity and vibration resistance of the impeller 5 during processing. When the gripper 3 releases its grip, the third elastic element 23 releases its elastic potential energy, pushing the transmission rod 251 to reverse and reset. The transmission rod 251 drives the transmission block 252 to move, and causes the stop block 24 to exit the slide groove 10, releasing the obstruction to the slider 2. The slider 2 can then retract normally into the sub-claw body 31, providing clearance space for the finished impeller 5 to be removed.

[0053] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A three-jaw tooling suitable for closed impellers, characterized in that: Includes a chuck (1), on which three jaws (3) are equally spaced along its circumference. Each jaw (3) has a slider (2) slidably mounted on the side near the center of the chuck (1). Each jaw (3) is provided with a drive assembly (4). The drive assembly (4) is used to drive the slider (2) to extend out of the jaw (3) and engage in the flow channel (6) of the impeller (5). The upper and lower sides of the slider (2) near the impeller (5) are chamfered (9). The chamfers (9) on the upper and lower sides of the slider (2) abut against the front cover plate (7) and the rear cover plate (8) of the impeller (5), respectively.

2. The three-jaw tooling suitable for closed impellers according to claim 1, characterized in that: The drive assembly (4) includes a quick clamp (41), a push block (42), a push rod (43), a first elastic element (44), and a second elastic element (45). The jaw (3) has a groove (10) inside, and the slider (2) is slidably disposed in the groove (10). The quick clamp (41) is disposed on the jaw (3). The push rod (43) is fixedly disposed on the moving end of the quick clamp (41). The push rod (43) slidably passes through the slider (2). The push block (42) is fixedly disposed on the moving end of the quick clamp (41). The first elastic element (44) is sleeved on the push rod (43) and is used to push the slider (2) to press against the impeller (5). The second elastic element (45) is sleeved on the slider (2) and is used to push the slider (2) to retract into the jaw (3).

3. A three-jaw tooling suitable for closed impellers according to claim 2, characterized in that: The gripper (3) has a first parallel planar wall (11) at the end of the slide groove (10) near the impeller (5), and the slider (2) has a second parallel planar wall (12) at the end near the impeller (5). The two first planar walls (11) abut against the two second planar walls (12) respectively.

4. A three-jaw tooling suitable for closed impellers according to claim 1, characterized in that: The gripper (3) includes a female gripper body (32) and a female gripper body (31). The female gripper body (32) is mounted on the chuck (1). The female gripper body (31) is adjustablely mounted on the female gripper body (32). The sliding groove (10) is formed in the female gripper body (31). The side of the female gripper body (31) near the impeller (5) has an arc-shaped wall (13). The arc-shaped wall (13) of the female gripper body (31) abuts against the impeller (5). The slider (2) is slidably mounted in the female gripper body (31). The drive assembly (4) is mounted on the female gripper body (31).

5. A three-jaw tooling suitable for closed impellers according to claim 4, characterized in that: The sub-claw body (31) is detachably mounted on the mother claw body (32) by bolts. A first positioning block (14) and a second positioning block (15) are fixedly mounted on the bottom wall of the sub-claw body (31). A first positioning groove (16) is provided on the top wall of the mother claw body (32) along the diameter direction of the chuck (1). A second positioning groove (17) is provided on the top wall of the mother claw body (32) along the tangent direction of the parallel impeller (5). Multiple second positioning grooves (17) are spaced apart along the diameter direction of the chuck (1). The first positioning block (14) is inserted into the first positioning groove (16), and the second positioning block (15) is inserted into the second positioning groove (17).

6. A three-jaw tooling suitable for closed impellers according to claim 4, characterized in that: A T-shaped block (18) is slidably disposed inside the moving end of the chuck (1) along the diameter direction of the chuck (1). The female claw body (32) is detachably disposed on the T-shaped block (18) by bolts. Two first racks (19) are spaced apart at the bottom of the female claw body (32). Two second racks (20) are spaced apart on the moving end of the chuck (1). The two first racks (19) mesh with the two second racks (20), and the opposite side walls of the T-shaped block (18) abut against the two first racks (19) and the two second racks (20) respectively.

7. A three-jaw tooling suitable for closed impellers according to claim 4, characterized in that: A support member (21) is provided on the top wall of the female claw body (32). The support member (21) is adjustablely arranged on the female claw body (32) in the vertical direction. The impeller (5) is placed on the top of the three support members (21).

8. A three-jaw tooling suitable for closed impellers according to claim 4, characterized in that: Two clamping blocks (22) are slidably arranged on the side wall of the claw body (31) near the impeller (5). The arc wall (13) is formed on the clamping block (22). A third elastic element (23) is provided inside the claw body (31). The third elastic element (23) is used to push the clamping block (22) to move towards the impeller (5). A stop block (24) is slidably arranged on both sides of the claw body (31) located in the slide groove (10). A transmission assembly (25) is provided inside the claw body (31). The transmission assembly (25) drives the clamping block (22) and the stop block (24). When the clamping block (22) moves towards the claw body (31), the clamping block (22) drives the stop block (24) to slide into the slide groove (10) through the transmission assembly (25). The stop block (24) blocks the movement of the slider (2).

9. A three-jaw tooling suitable for closed impellers according to claim 8, characterized in that: The transmission assembly (25) includes a transmission rod (251) and a transmission block (252). The transmission rod (251) is slidably disposed in the claw body (31). One end of the transmission rod (251) is fixedly connected to the clamping block (22), and the other end of the transmission rod (251) abuts against the third elastic element (23). The transmission block (252) is fixedly disposed on the side wall of the transmission rod (251). A sliding hole (26) is provided in the stop block (24), and the transmission rod (251) slides through the sliding hole (26). A push groove (27) is obliquely provided on the side wall of the stop block (24) located in the sliding hole (26), and the transmission block (252) is slidably disposed in the push groove (27).

10. A three-jaw tooling suitable for closed impellers according to claim 9, characterized in that: The clamping block (22) includes a movable seat (221) and a clamping seat (222). The movable seat (221) is fixedly connected to the transmission rod (251). The arc wall (13) is formed on the clamping seat (222). The clamping seat (222) is rotatably disposed inside the movable seat (221).

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