Fixing support for high-precision impeller machining

Abstract

The invention provides a high-precision fixing support for impeller machining, and relates to the technical field of fixing supports, the high-precision fixing support comprises a lower fixing disc, a middle sliding-insertion connecting column, an upper sliding-insertion connecting column and an upper puller nut, the middle sliding-insertion connecting column is arranged on the upper portion of the lower fixing disc, and the upper portion of the middle sliding-insertion connecting column is in axial sliding connection with a bottom groove of the upper sliding-insertion connecting column; and an upper connecting pipe column is fixedly welded to the center of the top of the lower fixing disc, an inner connecting groove is axially formed in the center of the upper connecting pipe column, side clamping blocks are axially fixed to the two sides of the inner connecting groove at intervals in an array mode, and upper rotating frames are rotationally arranged on the two sides of the lower portion of the middle sliding-inserting connecting column in a rotating shaft fit mode. The outer clamping blocks and the side clamping blocks at different positions are clamped to be compatible with impellers of different heights, compared with bolt and nut type fixing, the number of rotation turns of nut fixing is reduced, and the problems that the nut needs to axially move for a long distance, and the number of rotation turns of the nut increases the fixing time are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fixed brackets for machining impellers by machine tools, and particularly relates to a fixed bracket for high-precision impeller machining. Background Art

[0002] The high-precision impeller is made of an integral metal blank and then machined by a five-axis machine tool. A hole has already been drilled through the center of the metal blank of the high-precision impeller, and the hole in the center of the metal blank is used to connect and fix with the fixed bracket of the machine tool.

[0003] The existing fixed bracket passes through a screw rod and the hole in the center of the metal blank of the high-precision impeller, and then a nut is used to move axially along the thread of the screw rod to realize the clamping and fixing operation on the top of the metal blank. However, during the fixing process, the nut needs to rotate many circles along the screw rod, and the time for the fastening operation is relatively long. In order to improve the compatibility of the screw rod with impeller blanks of different heights, when the screw rod fixes the raw materials of lower height, the nut needs to move axially for a longer distance, and the number of rotations of the nut increases, further lengthening the fixing time and reducing the fixing and installation efficiency. Summary of the Invention

[0004] An embodiment of the present disclosure relates to a fixed bracket for high-precision impeller machining. The middle sliding insertion connecting column and the upper connecting pipe column are slidably inserted and fixed in position by clamping with side clamping blocks and outer clamping blocks. The clamping of the outer clamping block and side clamping blocks at different positions enables compatibility with impellers of different heights. Compared with the bolt-and-nut type fixing, the number of rotations of nut fixing is reduced, the fixing efficiency is improved, and the time for the fixing operation is shorter. The upper tightening nut is rotated, and the distance between the upper tightening nut and the middle sliding insertion connecting column is reduced to realize the tightening operation between the upper tightening nut and the impeller top. Compared with the pure bolt-and-nut type fixing, the number of rotations of the upper tightening nut fixing is less, and the speed of the fixing operation is accelerated.

[0005] In the first aspect of the present disclosure, there is provided a fixed bracket for high-precision impeller machining, specifically including: a lower fixed disk, a middle sliding insertion connecting column, an upper sliding insertion connecting column, and an upper tightening nut. The upper part of the lower fixed disk is provided with a middle sliding insertion connecting column. The upper part of the middle sliding insertion connecting column is axially slidably connected to the bottom groove of the upper sliding insertion connecting column. The upper part of the upper sliding insertion connecting column is circumferentially rotated with an upper tightening nut. The center of the top of the lower fixed disk is welded and fixed with an upper connecting pipe column. An inner connecting groove is axially opened in the center of the upper connecting pipe column, and side clamping blocks are axially and spaced array-fixed on both sides of the inner connecting groove.

[0006] In at least some embodiments, on both sides of the lower part of the middle sliding insertion connecting column, there are upper rotating frames with an inverted L-shaped structure rotatably fitted by a rotating shaft. The lower end of the upper rotating frame is fixedly connected to the outer clamping block. Axially sliding in the central axis of the lower end of the middle sliding insertion connecting column is a middle limiting clamping block with an inverted T-shaped structure. The upper part of the middle limiting clamping block is screwed to the middle lead screw. Axially slidably connected to the upper end of the middle lead screw is a small bevel gear shaft. The upper bevel gear of the small bevel gear shaft meshes with a large bevel gear. The tooth ratio of the upper bevel gear of the small bevel gear shaft to the large bevel gear is ten to one. The center of the large bevel gear is fixedly connected to the middle transmission gear shaft.

[0007] In at least some embodiments, the middle sliding insertion connecting column is located inside the inner connecting groove. The middle limiting clamping block is located between the upper rotating frames on both sides of the middle sliding insertion connecting column. The middle lead screw is circumferentially rotatably connected to the middle sliding insertion connecting column. The middle transmission gear shaft is circumferentially rotatably connected to the middle sliding insertion connecting column. The outer clamping block and the side clamping block are slidably engaged, and the position of the impeller is fixed by the engagement of the side clamping block and the outer clamping block.

[0008] In at least some embodiments, the upper end of the small bevel gear shaft is fixedly connected to the outer support spring. The lower end of the outer support spring is fixedly connected to the middle sliding insertion connecting column. The small bevel gear shaft and the middle sliding insertion connecting column axially slide. The outer support spring supports the small bevel gear shaft and the large bevel gear to remain engaged. When the small bevel gear shaft and the middle lead screw cannot continue to rotate and the large bevel gear is still rotating, the large bevel gear will push the small bevel gear shaft downward to compress the outer support spring, and the small bevel gear shaft moves downward and away from the large bevel gear.

[0009] In at least some embodiments, on the inner side of the lower part of the upper sliding insertion connecting column, there is a side tooth block groove, which meshes with the gear at the tail end of the middle transmission gear shaft. An upper annular gasket is sleeved on the upper part of the upper sliding insertion connecting column.

[0010] In at least some embodiments, at the bottom center of the upper tightening nut, there is an upper screw rod welded and fixed. Axially sliding on one side of the middle part of the upper tightening nut is a side screw rod. The side screw rod and the side large gear disk penetrate and slide through the center. The side large gear disk meshes with the side small gear shaft. The tooth ratio of the side large gear disk to the side small gear shaft is ten to one. The upper end of the side small gear shaft is fixedly connected to the center of the upper display disk. An upper display hole is axially opened in the middle part of the upper tightening nut.

[0011] In at least some embodiments, the middle part of the upper screw rod is rotatably connected to the upper sliding insertion connecting column. The lower thread of the upper screw rod is screwed to the upper part of the middle sliding insertion connecting column. The side large gear disk is circumferentially rotatably connected to the upper tightening nut. The side small gear shaft is rotatably connected to the upper tightening nut. The upper display disk is located at the bottom of the upper display hole.

[0012] In at least some embodiments, an upper support spring is fixed to the top of the side screw rod. The upper end of the upper support spring is fixed to the upper tightening nut. The lower end of the side screw rod penetrates through the bottom of the upper tightening nut. The upper support spring supports the side screw rod to move and protrude from the bottom of the upper tightening nut. The bottom surface of the upper tightening nut fits with the upper annular gasket. The upper annular gasket pushes against the side screw rod to move axially upward perpendicular to it. The helix of the side screw rod guides the side large gear disk to rotate circumferentially. The side large gear disk meshes with and drives the side small gear shaft and the upper display disk to rotate synchronously.

[0013] The present invention provides a fixing bracket for high-precision impeller processing, which has the following beneficial effects: The middle sliding insertion connecting column and the upper connecting pipe column are slidably inserted and fixed in position by the engagement of the side clamping block and the outer clamping block. The engagement of the outer clamping block with the side clamping blocks at different positions enables compatibility with impellers of different heights. Compared with the bolt-nut type fixing, the number of rotation turns of the nut fixing is reduced, the fixing efficiency is improved, and the time for the fixing operation is shorter.

[0014] The upper tightening nut rotates, and the distance between the upper tightening nut and the middle sliding insertion connecting column is reduced to achieve the tightening operation of the upper tightening nut against the impeller. Compared with the pure bolt-nut type fixing, the number of rotation turns of the upper tightening nut fixing is less, and the speed of the fixing operation is accelerated.

[0015] While the middle sliding insertion connecting column moves, the middle transmission gear shaft rotates along the side tooth block groove. The middle limiting block moves between the outer clamping blocks, and the outer clamping block cannot move, further ensuring that the outer clamping block and the side clamping block remain engaged, and ensuring the firmness of the impeller fixing state.

[0016] During the process of the upper tightening nut approaching the top of the impeller, the side screw rod moves axially, and the upper display disk rotates. Personnel view the display of the upper display disk through the upper display hole. The upper display disk performs the display operation at different distances from the impeller, ensuring the stability of the fixing of the upper tightening nut to the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0018] The accompanying drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the accompanying drawings: Figure 1 shows a schematic structural diagram of the impeller fixing state of the present application; Figure 2 shows a schematic structural diagram of the cross-section of the lower fixing disk of the present application; Figure 3 shows a schematic structural diagram of the cross-section of the middle sliding insertion connecting column of the present application; Figure 4 Shows the structural schematic diagram of the upward sliding plug connection column section of the present application; Figure 5 Shows the structural schematic diagram of the upward pressing nut section of the present application; Figure 6 Shows the structural schematic diagram of the upper display disk of the present application; Figure 7 Shows the structural schematic diagram of the side screw rod of the present application; Figure 8 Shows the structural schematic diagram of the middle limit block of the present application; List of reference numerals 1. Lower fixed disk; 101. Upper connecting pipe column; 102. Inner connecting groove; 103. Side clamping block; 2. Middle sliding plug connection column; 201. Outer clamping block; 202. Upper rotating frame; 203. Middle limit block; 204. Middle lead screw; 205. Small bevel gear shaft; 206. Outer support spring; 207. Large bevel gear; 208. Middle transmission gear shaft; 3. Upper sliding plug connection column; 301. Side tooth block groove; 302. Upper annular gasket; 4. Upper pressing nut; 401. Upper screw rod; 402. Side screw rod; 403. Side large gear disk; 404. Side small gear shaft; 405. Upper display disk; 406. Upper display hole; 407. Upper support spring. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1: Please refer to Figures 1 to 8 : The present invention provides a fixed bracket for high-precision impeller machining, including: a lower fixed disk 1, a middle sliding insertion connecting column 2, an upper sliding insertion connecting column 3, and an upper tightening nut 4. A upper connecting pipe column 101 is fixedly welded to the top center of the lower fixed disk 1. An inner connecting groove 102 is axially opened in the center of the upper connecting pipe column 101. Side clamping blocks 103 are fixedly arranged at both sides of the inner connecting groove 102 at axial intervals. When the middle sliding insertion connecting column 2 and the inner connecting groove 102 of the upper connecting pipe column 101 are slidably inserted, the outer clamping block 201 moves towards the middle along with the upper rotating frame 202, and the outer clamping block 201 and the side clamping block 103 will not engage. The middle sliding insertion connecting column 2 is arranged on the upper part of the lower fixed disk 1. Inverted L-shaped upper rotating frames 202 are rotatably matched with the lower sides of the middle sliding insertion connecting column 2 by means of a rotating shaft. The lower end of the upper rotating frame 202 is fixedly connected to the outer clamping block 201. A middle limiting clamping block 203 with an inverted T-shaped structure axially slides at the center of the lower end of the middle sliding insertion connecting column 2. The upper part of the middle limiting clamping block 203 is screwed to a middle lead screw 204. The upper end of the middle lead screw 204 is axially slidably connected to a small bevel gear shaft 205. The upper bevel gear of the small bevel gear shaft 205 meshes with a large bevel gear 207. The tooth ratio of the upper bevel gear of the small bevel gear shaft 205 and the large bevel gear 207 is ten to one. The center of the large bevel gear 207 is fixedly connected to a middle transmission gear shaft 208. The tooth blocks of the middle transmission gear shaft 208 engage and rotate along the tooth grooves of the side tooth block grooves 301. The middle transmission gear shaft 208 and the large bevel gear 207 rotate synchronously. The large bevel gear 207 drives the small bevel gear shaft 205 to rotate. The small bevel gear shaft 205 drives the middle lead screw 204 to rotate synchronously. The thread of the middle lead screw 204 guides the middle limiting clamping block 203 to move. The upper end of the small bevel gear shaft 205 is fixedly connected to an outer support spring 206. The lower end of the outer support spring 206 is fixedly connected to the middle sliding insertion connecting column 2. The small bevel gear shaft 205 and the middle sliding insertion connecting column 2 axially slide. The outer support spring 206 supports the small bevel gear shaft 205 and the large bevel gear 207 to maintain engagement. When the small bevel gear shaft 205 and the middle lead screw 204 cannot continue to rotate and the large bevel gear 207 is still rotating, the large bevel gear 207 will push the small bevel gear shaft 205 downward to compress the outer support spring 206. The small bevel gear shaft 205 moves downward and away from the large bevel gear 207, avoiding the situation where the large bevel gear 207 and the small bevel gear shaft 205 are stuck and cannot move further; The upper part of the middle sliding insertion connecting column 2 is axially slidably connected to the bottom groove of the upper sliding insertion connecting column 3. A side tooth block groove 301 is formed inside the lower part of the upper sliding insertion connecting column 3, and the side tooth block groove 301 meshes with the gear at the tail end of the middle transmission gear shaft 208. An upper annular gasket 302 is sleeved on the upper part of the upper sliding insertion connecting column 3. When the impeller has a larger central hole position, only the upper sliding insertion connecting column 3 needs to be replaced with the size corresponding to the hole position, and the middle sliding insertion connecting column 2, the upper connecting pipe column 101, etc. do not need to be replaced, reducing the number of components that need to be replaced when fixing impellers with different size hole positions and improving compatibility. The upper tightening nut 4 rotates circumferentially on the upper part of the upper sliding insertion connecting column 3. The upper screw rod 401 is fixedly welded to the center of the bottom of the upper tightening nut 4. A side screw rod 402 slides axially on one side of the middle part of the upper tightening nut 4. The side screw rod 402 passes through and slides in the center of the side large gear disk 403. The side large gear disk 403 meshes with the side small gear shaft 404. The gear ratio of the side large gear disk 403 to the side small gear shaft 404 is ten to one. The upper end of the side small gear shaft 404 is fixedly connected to the center of the upper display disk 405. An upper display hole 406 is axially formed in the middle part of the upper tightening nut 4. The middle part of the upper screw rod 401 is rotatably connected to the upper sliding insertion connecting column 3. The lower part of the upper screw rod 401 is threadedly connected to the upper part of the middle sliding insertion connecting column 2. The side large gear disk 403 is rotatably connected to the upper tightening nut 4 circumferentially. The side small gear shaft 404 is rotatably connected to the upper tightening nut 4. The upper display disk 405 is located at the bottom of the upper display hole 406.

[0022] In the embodiment of the present disclosure, the middle sliding insertion connecting column 2 is located inside the inner connecting groove 102. The middle limit block 203 is located between the upper rotating frames 202 on both sides of the middle sliding insertion connecting column 2. The middle lead screw 204 is rotatably connected to the middle sliding insertion connecting column 2 circumferentially. The middle transmission gear shaft 208 is rotatably connected to the middle sliding insertion connecting column 2 circumferentially. The outer block 201 and the side block 103 are slidably engaged. The position of the impeller is fixed by the engagement of the side block 103 and the outer block 201. The outer block 201 is compatible with impellers of different heights by engaging with side blocks 103 at different positions. Compared with the existing bolt and nut fixing method, the number of turns of the nut rotation is reduced.

[0023] In the embodiment of the present disclosure, an upper support spring 407 is fixed to the top of the side screw rod 402. The upper end of the upper support spring 407 is fixed to the upper tightening nut 4. The lower end of the side screw rod 402 penetrates through the bottom of the upper tightening nut 4. The upper support spring 407 supports the side screw rod 402 to move and protrude from the bottom of the upper tightening nut 4. The bottom surface of the upper tightening nut 4 is in contact with the upper annular gasket 302. The upper annular gasket 302 pushes the side screw rod 402 to move axially upward perpendicular to it. The spiral of the side screw rod 402 guides the side large gear disk 403 to rotate circumferentially. The side large gear disk 403 meshes with and drives the side small gear shaft 404 and the upper display disk 405 to rotate synchronously. The top of the upper display disk 405 has a color change from light to deep. Personnel can view the fastening state through the upper display hole 406 for the display of the upper display disk 405.

[0024] Embodiment 2: On the basis of Embodiment 1, the components of the side screw rod 402, the side large gear disk 403, the side small gear shaft 404, the upper display disk 405, the upper display hole 406, and the upper support spring 407 of the upper tightening nut 4 may not be provided, which simplifies the number of components of the upper tightening nut 4, reduces the manufacturing cost of the upper tightening nut 4, speeds up the assembly speed, and further classifies different levels with different prices and functions.

[0025] Working principle of this embodiment: The lower fixed disk 1 is fixed to the workbench of the processing machine tool. The upper connecting pipe column 101 is aligned and penetrated through the hole position at the center of the impeller. The bottom surface of the impeller is attached to the top surface of the lower fixed disk 1. Then, the middle sliding insertion connecting column 2 is slidably inserted into the inner connecting groove 102 of the upper connecting pipe column 101, and the upper sliding insertion connecting column 3 is attached to the inner wall of the central hole position of the impeller. When the impeller has a larger central hole position, only the upper sliding insertion connecting column 3 needs to be replaced with the size corresponding to the hole position, and the middle sliding insertion connecting column 2, the upper connecting pipe column 101, etc. do not need to be replaced, reducing the number of components that need to be replaced when fixing impellers with different-sized hole positions, improving compatibility, and accelerating the fixing speed. When the middle sliding insertion connecting column 2 is slidably inserted into the inner connecting groove 102 of the upper connecting pipe column 101, the outer clamping block 201 moves towards the middle along with the upper rotating frame 202, and the outer clamping block 201 does not engage with the side clamping block 103. When the middle sliding insertion connecting column 2 is separated from the upper connecting pipe column 101, the outer clamping block 201 also moves towards the middle along with the upper rotating frame 202, and the side clamping block 103 does not engage with the outer clamping block 201. By driving the hexagonal upper tightening nut 4 with a wrench to rotate, the upper tightening nut 4 and the upper screw rod 401 rotate synchronously. The thread of the upper screw rod 401 guides the axial movement of the middle sliding insertion connecting column 2, and the distance between the middle sliding insertion connecting column 2 and the upper sliding insertion connecting column 3 moves and shrinks. The middle sliding insertion connecting column 2 and the outer clamping block 201 move synchronously. While the middle sliding insertion connecting column 2 moves, the tooth block of the middle transmission gear shaft 208 meshes and rotates along the tooth groove of the side tooth block groove 301. The middle transmission gear shaft 208 and the large bevel gear 207 rotate synchronously. The large bevel gear 207 meshes and drives the small bevel gear shaft 205 to rotate. The small bevel gear shaft 205 drives the middle lead screw 204 to rotate synchronously. The thread of the middle lead screw 204 guides the middle limit clamping block 203 to move between the outer clamping blocks 201. Both sides of the middle limit clamping block 203 are attached to the inner vertical surfaces of the outer clamping blocks 201, and the outer clamping blocks 201 cannot move along with the upper rotating frame 202, further ensuring that the outer clamping blocks 201 and the side clamping blocks 103 remain in an engaged state and ensuring the firmness of the impeller fixing state. The position of the impeller is fixed by the engagement of the side clamping block 103 and the outer clamping block 201. The outer clamping block 201 is compatible with impellers at different heights by engaging with the side clamping blocks 103 at different positions. Compared with the existing bolt and nut fixing method, the number of rotation circles of nut fixing can be reduced, the fixing efficiency can be improved, and the time for each loosening operation and fixing operation is shorter; The upper annular gasket 302 is attached to the top of the impeller. The upper tightening nut 4 presses on the top of the impeller through the upper annular gasket 302 to avoid scratches caused by the direct contact between the upper tightening nut 4 and the impeller. The distance between the upper tightening nut 4 and the middle sliding insertion connecting column 2 is reduced to achieve the tightening operation of the upper tightening nut 4 pressing on the impeller. Compared with the pure bolt and nut fixing, the upper tightening nut 4 has fewer rotation circles for fixing and faster fixing operation speed; Meanwhile, during the process of fixing the upper tightening nut 4 near the top of the impeller, while the upper annular gasket 302 rotates circumferentially, it can also move axially within a certain range along the upper part of the upper sliding insertion connecting column 3. The upper annular gasket 302 moves closer to the upper tightening nut 4 and the side screw rod 402. The upper annular gasket 302 pushes against the side screw rod 402 to move axially vertically upward. The spiral guiding side of the side screw rod 402 drives the large gear disk 403 to rotate circumferentially. The large gear disk 403 meshes with and drives the side pinion shaft 404 and the upper display disk 405 to rotate synchronously. The top of the upper display disk 405 has a color change from light to dark. The dark part of the upper display disk 405 rotates to below the upper display hole 406 as the tightening progresses. Personnel can view the display of the upper display disk 405 through the upper display hole 406. The upper display disk 405 performs display operations at different distances from the impeller to assist personnel in continuing to check the tightening state and ensure the firm fixation of the upper tightening nut 4 to the impeller.

[0026] In this article, the following points need to be noted: 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure. Other structures can refer to the general design.

[0027] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0028] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A fixing bracket for high-precision impeller machining, comprising: A lower fixed plate (1), a middle sliding plug connection column (2), an upper sliding plug connection column (3) and an upper tightening nut (4); characterized in that a middle sliding plug connection column (2) is provided on the upper part of the lower fixed plate (1), the upper part of the middle sliding plug connection column (2) and the bottom of the upper sliding plug connection column (3) are axially slidably connected, the upper part of the upper sliding plug connection column (3) is circumferentially rotated with an upper tightening nut (4), and both sides of the lower part of the middle sliding plug connection column (2) are rotated with an upper rotating frame (202) in cooperation with the rotating shaft The lower end of the upper rotating frame (202) is fixedly connected to the outer clamping block (201), the lower end center of the middle sliding connecting column (2) is axially slidable with a middle limit clamping block (203), the upper part of the middle limit clamping block (203) is screwed to the middle lead screw (204), the upper end of the middle lead screw (204) is axially slidably connected with a small bevel gear shaft (205), the small bevel gear shaft (205) is meshed with a large bevel gear (207), and the center of the large bevel gear (207) is fixed to the middle transmission gear shaft (208).

2. A fixing bracket for high-precision impeller machining according to claim 1, characterized in that: An upper connecting pipe column (101) is fixed at the top centre of the lower fixing plate (1), an inner connecting groove (102) is axially opened at the centre of the upper connecting pipe column (101), and side clamping blocks (103) are axially fixed in an array at intervals on both sides of the inner connecting groove (102).

3. The fixing bracket for high-precision impeller machining according to claim 1, characterized in that: The middle limit block (203) is located between the rotating frames (202) on both sides of the middle sliding plug connecting column (2), the middle lead screw (204) and the middle sliding plug connecting column (2) are connected in a circumferential rotational direction, and the middle transmission gear shaft (208) and the middle sliding plug connecting column (2) are connected in a circumferential rotational direction.

4. A fixing bracket for high-precision impeller machining according to claim 3, characterized in that: The small bevel gear shaft (205) and the upper ends of the outer support spring (206) are fixed, the lower end of the outer support spring (206) and the middle sliding plug connecting column (2) are fixed, the small bevel gear shaft (205) and the middle sliding plug connecting column (2) slide axially, and the outer support spring (206) supports the small bevel gear shaft (205) and the large bevel gear (207) to maintain meshing.

5. The fixing bracket for high-precision impeller machining according to claim 1, characterized in that: A side tooth block groove (301) is provided on the inner side of the lower part of the upper sliding connection column (3), the side tooth block groove (301) is meshed with the rear end of the middle transmission gear shaft (208), and an upper annular gasket (302) is sleeved on the upper part of the upper sliding connection column (3).

6. A fixing bracket for high-precision impeller machining according to claim 5, characterized in that: An upper screw rod (401) is fixed at the bottom center of the upper locking nut (4), a side screw rod (402) is axially slidable at one side of the middle of the upper locking nut (4), the side screw rod (402) and the center of the side large gear plate (403) penetrate and slide, the side large gear plate (403) and the side small gear shaft (404) are meshed, the upper end of the side small gear shaft (404) and the center of the upper display plate (405) are fixed, and an upper display hole (406) is axially opened at the middle of the upper locking nut (4).

7. A fixing bracket for high-precision impeller machining according to claim 6, characterized in that: The middle part of the upper screw rod (401) is rotatably connected to the upper sliding connection column (3), the lower thread of the upper screw rod (401) is threadedly connected to the upper part of the middle sliding connection column (2), the side large gear plate (403) is rotatably connected to the upper top nut (4), the side small gear shaft (404) is rotatably connected to the upper top nut (4), and the upper display plate (405) is located at the bottom of the upper display hole (406).

8. A fixing bracket for high-precision impeller machining according to claim 7, characterized in that: An upper support spring (407) is fixed to the top of the side spiral rod (402), the upper end of the upper support spring (407) is fixed to the upper tightening nut (4), the lower end of the side spiral rod (402) passes through the bottom of the upper tightening nut (4), the upper support spring (407) supports the side spiral rod (402) to move and protrude to the bottom of the upper tightening nut (4), and the bottom surface of the upper tightening nut (4) is in contact with the upper annular gasket (302).

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