A positioning tooling for the impeller of a fiberglass centrifugal fan

Abstract

The present invention relates to the technical field of centrifugal fan manufacturing, and particularly to a positioning tooling for a fiberglass centrifugal fan impeller, which includes a mold body and an impeller assembly. The impeller assembly includes an impeller upper disc and an impeller bottom disc. A number of impeller blades are provided between the impeller upper disc and the impeller bottom disc. An angle positioning piece is arranged inside the impeller assembly. A number of positioning grooves adapted to the impeller blades are evenly formed on the angle positioning piece. An umbrella expansion structure adapted to impeller blades of different sizes is also arranged on the angle positioning piece. A centering structure capable of centering and positioning the angle positioning piece at the center position of the impeller upper disc is further arranged at the upper end of the impeller bottom disc, effectively solving the problems in the prior art that displacement is likely to occur during the welding process, the perpendicularity of the impeller blade welding cannot be guaranteed, the manual scribing work efficiency is low, and the fixed positioning devices of most impellers can only fix impeller blades of the same specification and cannot adapt to impeller blades of different sizes.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal fan manufacturing, and particularly to a positioning tooling for a fiberglass centrifugal fan impeller. Background Art

[0002] A centrifugal fan operates based on the principle of converting kinetic energy into potential energy. It uses a high-speed rotating impeller to accelerate the gas, and then decelerates and changes the flow direction to convert kinetic energy into potential energy. Centrifugal fans are widely used in ventilation, dust removal, and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings; ventilation and induced draft in boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household electrical appliances; drying and selection of grains; air source for wind tunnels and inflation and propulsion of hovercrafts, etc.

[0003] In the production of centrifugal fan impellers, it is necessary to weld the blades to the positioned rear disc. In traditional technologies, manual scribing is mostly used for positioning welding on the positioned rear disc, but there are deficiencies:

[0004] 1. During the welding process, displacement is likely to occur, the perpendicularity of blade welding cannot be guaranteed, and the work efficiency of manual scribing is relatively low;

[0005] 2. The sizes of the impeller blades of the fan vary, and most positioning devices for impeller blades can only fix impeller blades of the same specification and cannot adapt to impeller blades of different sizes. Summary of the Invention

[0006] In view of the above situation, to overcome the defects of the prior art, the present invention provides a positioning tooling for a fiberglass centrifugal fan impeller, which effectively solves the problems in the prior art that displacement is likely to occur during the welding process, the perpendicularity of blade welding cannot be guaranteed, the work efficiency of manual scribing is relatively low, and most positioning devices for impeller blades can only fix impeller blades of the same specification and cannot adapt to impeller blades of different sizes.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A positioning tooling for the impeller of a fiberglass centrifugal fan, comprising a mold body and an impeller assembly. The mold body includes a first mold body and a second mold body that can be closed. The impeller assembly includes an impeller upper disc and an impeller bottom disc. A number of impeller blades are arranged between the impeller upper disc and the impeller bottom disc. An angle positioning piece is arranged inside the impeller assembly. A number of positioning grooves adapted to the impeller blades are evenly formed on the angle positioning piece. An umbrella expansion structure adapted to impeller blades of different sizes is also arranged on the angle positioning piece. The umbrella expansion structure includes a number of struts that can be extended synchronously. The end of the strut is rotatably connected to an inner groove slider that is slidably connected to the angle positioning piece. Positioning pins that are slidably connected to the positioning grooves are respectively arranged inside the inner groove slider. A centering structure that can center and position the angle positioning piece at the center position of the impeller upper disc is also arranged at the upper end of the impeller bottom disc. The centering structure includes a pair of scale plates that can slide towards each other.

[0009] Preferably, semi-circular mold holes are respectively formed on the first mold body and the second mold body. A number of positioning blocks are evenly arranged inside the semi-circular mold holes. Grooves are respectively arranged on the opposite surfaces at both ends of the first mold body and the second mold body. A pair of mold closing holes are arranged inside the grooves.

[0010] Preferably, the umbrella expansion structure further includes a screw rod rotatably connected to the center position of the angle positioning piece. A sleeve is arranged at the upper end of the angle positioning piece. A screw barrel that is threadedly connected to the screw rod is fixedly connected to the inner wall of the sleeve. A number of indexing grooves are evenly formed on the circumferential periphery of the sleeve. The struts are rotatably connected inside the indexing grooves. The other end of the strut is rotatably connected to the inner groove slider. A support rod is fixedly connected to the upper end of the screw rod. The centering structure is arranged on the support rod.

[0011] Preferably, the centering structure further includes an annular column. A rotating cylinder rotatably connected to the support rod is arranged at the lower end of the annular column. A storage groove is formed inside the annular column. A first rack and a second rack are respectively slidably connected to both ends of the storage groove. A rotating column rotatably connected to the annular column is arranged at the center position of the storage groove. A spur gear fixedly connected to the rotating column is arranged on the rotating column. The two ends of the spur gear are respectively engaged with the first rack and the second rack. A worm gear fixedly connected to the rotating column is coaxially arranged with the spur gear. A worm meshing with the worm gear is rotatably connected to the annular column. The ends of the first rack and the second rack are respectively fixedly connected with the scale plates.

[0012] Preferably, splicing blocks fixedly connected to the annular column are respectively arranged at both ends of the storage groove. Slide pins slidably connected to the inner walls of the splicing blocks are respectively arranged on the first rack and the second rack.

[0013] Preferably, the positioning grooves are evenly arranged on the angle positioning piece. The positioning pins are slidably connected to the inner wall of the inner groove slider.

[0014] Preferably, a plugging disc is fixedly connected to the upper end of the positioning pin, and the diameter of the plugging disc is greater than the inner groove width of the inner groove slider.

[0015] Preferably, the upper and lower ends of the impeller blades are respectively welded to the opposite surfaces of the impeller upper disc and the impeller bottom disc.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. By setting up the umbrella expansion structure in the present invention, the struts respectively drive the inner groove sliders to slide synchronously along the upper surface of the angle positioning piece. The inner groove sliders drive the positioning pins to slide along the positioning grooves. When the impeller blades are placed into the positioning grooves, by changing the position of the positioning slide pins in the positioning grooves, and then according to the size of the impeller blades, the depth of the impeller blades placed into the positioning grooves is changed. And because the positioning slide pins are synchronously located in the positioning grooves 10 and are within the same circumference of the angle positioning piece, the depth of the impeller blades placed into the positioning grooves of the angle positioning piece is ensured to be the same.

[0018] 2. The impeller blades are evenly inserted into the positioning grooves of the angle positioning piece, and then the impeller upper disc is placed on the upper ends of the impeller blades. Limited by the first die body and the second die body, the impeller upper disc and the impeller bottom disc are in the same axis position, effectively avoiding the displacement of the impeller blades during the welding process and ensuring the perpendicularity of the blade welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the mold closing structure of the mold main body of a positioning tooling for a fiberglass centrifugal fan impeller of the present invention;

[0020] Figure 2 It is a schematic diagram of the mold opening structure of the mold main body of a positioning tooling for a fiberglass centrifugal fan impeller of the present invention;

[0021] Figure 3 It is a first schematic diagram of the impeller assembly of a positioning tooling for a fiberglass centrifugal fan impeller of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the impeller upper disc of a positioning tooling for a fiberglass centrifugal fan impeller of the present invention;

[0023] Figure 5 It is a second schematic diagram of the impeller assembly of a positioning tooling for a fiberglass centrifugal fan impeller of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the umbrella expansion structure of a positioning tooling for a fiberglass centrifugal fan impeller of the present invention;

[0025] Figure 7Structural schematic diagram of the sleeve of a positioning tooling for the impeller of a fiberglass centrifugal fan according to the present invention;

[0026] Figure 8 Structural schematic diagram of the centering structure of a positioning tooling for the impeller of a fiberglass centrifugal fan according to the present invention;

[0027] Figure 9 Structural schematic diagram of the annular column of a positioning tooling for the impeller of a fiberglass centrifugal fan according to the present invention;

[0028] Figure 10 For a positioning tooling for the impeller of a fiberglass centrifugal fan according to the present invention Figure 6 Partial enlarged view of area B;

[0029] In the figure: 1. First mold body, 2. Positioning block, 3. Die closing hole, 4. Upper impeller disc, 5. Angle positioning piece, 6. Impeller blade, 7. Lower impeller disc, 8. Second mold body, 9. Groove, 10. Positioning groove, 11. Support rod, 12. Inner groove slider, 13. Strut, 14. Scale plate, 15. First rack, 16. Second rack, 17. Slide pin, 18. Worm gear, 19. Annular column, 20. Worm, 21. First rotating handle, 22. Sleeve, 23. Screw rod, 24. Screw barrel, 25. Plug disc, 26. Positioning pin, 27. Rotating cylinder, 28. Splicing block, 29. Straight gear, 30. Rotating column, 31. Storage groove, 32. Semi-circular die hole, 33. Second rotating handle, 34. Indexing groove. Detailed implementation manners

[0030] As Figures 1-10 shown, a positioning tooling for the impeller of a fiberglass centrifugal fan includes a mold main body and an impeller assembly. The mold main body includes a first mold body 1 and a second mold body 8 that can be closed. The impeller assembly includes an upper impeller disc 4 and a lower impeller disc 7. A plurality of impeller blades 6 are arranged between the upper impeller disc 4 and the lower impeller disc 7. An angle positioning piece 5 is arranged inside the impeller assembly. A plurality of positioning grooves 10 adapted to the impeller blades 6 are evenly formed on the angle positioning piece 5. An umbrella expansion structure adapted to impeller blades 6 of different sizes is further arranged on the angle positioning piece 5. The umbrella expansion structure includes a plurality of struts 13 that can be synchronously extended. The end of the strut 13 is rotatably connected to an inner groove slider 12 that is slidably connected to the angle positioning piece 5. Positioning pins 26 that are slidably connected to the positioning grooves 10 are respectively arranged inside the inner groove slider 12. A centering structure for centering and positioning the angle positioning piece 5 at the center position of the upper impeller disc 4 is further arranged at the upper end of the lower impeller disc 7. The centering structure includes a pair of scale plates 14 that can slide towards each other.

[0031] When the present invention is in use, the first mold body 1 and the second mold body 8 are opened, the impeller chassis 7 is placed between the first mold body 1 and the second mold body 8, and then the first mold body 1 and the second mold body 8 are closed and fixed to clamp and fix the impeller chassis 7. The angle positioning piece 5 is placed on the impeller chassis 7, and then the impeller blades 6 are evenly inserted into the positioning grooves 10 of the angle positioning piece 5. Then the impeller upper disc 4 is placed on the upper ends of the impeller blades 6. Limited by the first mold body 1 and the second mold body 8, the impeller upper disc 4 and the impeller chassis 7 are in the same axial center position. According to the size of the impeller blades 6, ensure that the impeller blades 6 can be adapted to the impeller upper disc 4 and the impeller chassis 7. Control the umbrella-opening structure to work, and the support rod 13 swings synchronously. The support rod 13 drives the inner groove slider 12 to slide synchronously along the upper surface of the angle positioning piece 5. The inner groove slider 12 drives the positioning pin 26 to slide along the positioning groove 10. When the impeller blades 6 are placed into the positioning grooves 10, by changing the position of the positioning slide pin 17 in the positioning grooves 10, and then according to the size of the impeller blades 6, change the depth of the impeller blades 6 placed into the positioning grooves 10. And because the positioning slide pins 17 are synchronously in the positioning grooves 10 and are within the same circumference of the angle positioning piece 5, thus ensuring that the depths of the impeller blades 6 placed into the positioning grooves 10 of the angle positioning piece 5 are the same. At the same time, control the centering structure to work, and the scale plates 14 slide towards both ends synchronously. The scale plates 14 are abutted against both ends of the impeller upper disc 4, thus ensuring that the angle positioning piece 5 is in the same axial center position as the impeller chassis 7 and the impeller upper disc 4. And because the depths of the impeller blades 6 placed into the positioning grooves 10 of the angle positioning piece 5 are the same, thus ensuring that the circumferential positions of the impeller blades 6 between the impeller chassis 7 and the impeller upper disc 4 are the same. Then the upper and lower ends of the impeller blades 6 are respectively fixedly arranged at the opposite surfaces of the impeller upper disc 4 and the impeller chassis 7 to realize the positioning and assembly of the impeller combination.

[0032] Semicircular mold holes 32 are respectively formed in the first mold body 1 and the second mold body 8. A plurality of positioning blocks 2 are evenly arranged in the semicircular mold holes 32. Grooves 9 are respectively arranged on the opposite surfaces at both ends of the first mold body 1 and the second mold body 8. A pair of mold closing holes 3 are arranged in the grooves 9.

[0033] As Figure 1 and 2 shown, after the first mold body 1 and the second mold body 8 are closed, the semicircular mold holes 32 on the two are spliced into a center receiving hole for clamping and fixing the impeller chassis 7. The first mold body 1 and the second mold body 8 are closed and fixed by inserting bolts and nuts into the mold closing holes 3.

[0034] The umbrella opening structure further includes a screw rod 23 rotatably connected to the central position of the angle positioning piece 5. A sleeve 22 is provided at the upper end of the angle positioning piece 5. A screw barrel 24 threadedly connected to the screw rod 23 is fixedly connected to the inner wall of the sleeve 22. A plurality of indexing grooves 34 are evenly formed in the circumferential periphery of the sleeve 22. The support rod 13 is rotatably connected in the indexing groove 34. The other end of the support rod 13 is rotatably connected to the inner groove slider 12. A support rod 11 is fixedly connected to the upper end of the screw rod 23. The centering structure is provided on the support rod 11.

[0035] As Figure 6 and 7 As shown, a first rotating handle 21 is fixedly connected to the support rod 11. By rotating the first rotating handle 21, the first rotating handle 21 drives the screw rod 23 to rotate. During the rotation of the screw rod 23, through the threaded cooperation with the screw barrel 24 on the inner wall of the sleeve 22, since one end of the support rod 13 is evenly and rotatably arranged in the indexing groove 34 of the sleeve 22, and the positioning pin 26 on the inner groove slider 12 at the other end of the support rod 13 is arranged in the positioning groove 10, the sleeve 22 can be limited. Furthermore, through the threaded cooperation of the screw rod 23 and the screw barrel 24, the sleeve 22 is driven to move along the axial direction of the screw rod 23. When the sleeve 22 moves up and down, the support rod 13 is driven to swing, and the support rod 13 respectively drives the inner groove slider 12 to slide synchronously along the upper surface of the angle positioning piece 5.

[0036] The centering structure further includes an annular column 19. A rotating cylinder 27 rotatably connected to the support rod 11 is provided at the lower end of the annular column 19. A storage groove 31 is formed in the annular column 19. A first rack 15 and a second rack 16 are respectively slidably connected to both ends of the storage groove 31. A rotating column 30 rotatably connected to the annular column 19 is provided at the central position of the storage groove 31. A spur gear 29 is fixedly connected to the rotating column 30. The two ends of the spur gear 29 are respectively engaged with the first rack 15 and the second rack 16. A worm gear 18 fixedly connected to the rotating column 30 is coaxially arranged with the spur gear 29. A worm 20 engaged with the worm gear 18 is rotatably connected to the annular column 19. The ends of the first rack 15 and the second rack 16 are respectively fixedly connected with the marking plate 14.

[0037] As Figure 6 and 8As shown in FIGS. 8 and 9, the rotary drum 27 is detachably arranged on the support rod 11. The annular column 19 is coaxially arranged on the support rod 11 by means of the rotary drum 27. One end of the worm 20 is provided with a second rotating handle 33. By rotating the second rotating handle 33, the second rotating handle 33 drives the worm 20 to rotate. The worm 20 drives the worm gear 18 to rotate. The worm gear 18 drives the rotating column 30 to rotate self. The rotating column 30 drives the spur gear 29 to rotate. During the rotation of the spur gear 29, the first rack 15 and the second rack 16 at both ends are respectively driven to move towards each other. The storage groove 31 accommodates and limits the sliding of the first rack 15 and the second rack 16.

[0038] Both ends of the storage groove 31 are respectively provided with splicing blocks 28 fixedly connected to the annular column 19. The first rack 15 and the second rack 16 are respectively provided with sliding pins 17 slidably connected to the inner wall of the splicing block 28.

[0039] As Figure 8 shown, during the process of the first rack 15 and the second rack 16 moving towards each other, the sliding pins 17 are respectively driven to slide along the inner wall of the splicing block 28, thereby realizing the movement limit of the first rack 15 and the second rack 16.

[0040] The positioning grooves 10 are uniformly arranged on the angle positioning piece 5. The positioning pins 26 are slidably connected to the inner wall of the inner groove slider 12.

[0041] As Figure 6 and 10 shown, the support rods 13 respectively drive the inner groove sliders 12 to slide synchronously along the upper surface of the angle positioning piece 5. Since the positioning grooves 10 are adapted to the model of the impeller blades 6, the positioning grooves 10 are arranged in an arc shape. Therefore, when the inner groove slider 12 pushes the positioning pin 26 to displace along the inner wall of the positioning groove 10, the positioning pin 26 will generate a short-distance lateral displacement. Therefore, by providing an inner wall hole on the inner groove slider 12, the movement limit effect on the positioning pin 26 is avoided.

[0042] The upper end of the positioning pin 26 is fixedly connected with a plug disk 25. The diameter of the plug disk 25 is larger than the inner groove width of the inner groove slider 12.

[0043] As Figure 7 shown, the plug disk 25 is arranged at the upper end of the positioning pin 26 and is supported on the upper end of the inner groove slider 12, which can effectively prevent the positioning slide pin 17 from breaking away from the limit of the inner groove slider 12.

[0044] The upper and lower ends of the impeller blades 6 are respectively welded to the opposite surfaces of the impeller upper disk 4 and the impeller bottom disk 7.

[0045] As Figure 3 and 5As shown, after positioning the impeller blade 6, the impeller blade 6 is fixed between the upper impeller disc 4 and the lower impeller chassis 7 by welding.

[0046] The working process of the present invention is as follows: when the present invention is in use, the first mold body 1 and the second mold body 8 are opened, and the lower impeller chassis 7 is placed between the first mold body 1 and the second mold body 8. After the first mold body 1 and the second mold body 8 are closed, the semi-circular mold holes 32 on both of them are spliced into a central receiving hole for clamping and fixing the lower impeller chassis 7. The first mold body 1 and the second mold body 8 are fixed by inserting bolts and nuts into the mold closing holes 3. The angle positioning piece 5 is placed on the lower impeller chassis 7, and then the impeller blades 6 are evenly inserted into the positioning grooves 10 of the angle positioning piece 5. The upper impeller disc 4 is placed on the upper end of the impeller blades 6. Limited by the semi-circular mold holes 32 of the first mold body 1 and the second mold body 8, the upper impeller disc 4 and the lower impeller chassis 7 are in the same axial position.

[0047] According to the size of the impeller blade 6, in order to ensure that the impeller blade 6 can be adapted to the upper impeller disc 4 and the lower impeller chassis 7, by rotating the first turning handle 21, the first turning handle 21 drives the screw rod 23 to rotate. During the rotation of the screw rod 23, through the threaded cooperation with the screw barrel 24 on the inner wall of the sleeve 22, the sleeve 22 is driven to move along the axial direction of the screw rod 23. Since one end of the strut 13 is evenly and rotatably arranged in the indexing groove 34 of the sleeve 22, when the sleeve 22 moves up and down, the strut 13 is driven to swing. The strut 13 respectively drives the inner groove slider 12 to slide synchronously along the upper surface of the angle positioning piece 5. The inner groove slider 12 drives the positioning pin 26 to slide along the positioning groove 10. When the impeller blade 6 is placed into the positioning groove 10, by changing the position of the positioning slide pin 17 in the positioning groove 10, according to the size of the impeller blade 6, the depth of the impeller blade 6 placed into the positioning groove 10 is changed. And because the positioning slide pins 17 are synchronously located in the positioning groove 10 and are in the same circumference of the angle positioning piece 5, the depth of the impeller blade 6 placed into the positioning groove 10 of the angle positioning piece 5 is ensured to be the same.

[0048] Meanwhile, by rotating the second rotating handle 33, the second rotating handle 33 drives the worm 20 to rotate, the worm 20 drives the worm wheel 18 to rotate, the worm wheel 18 drives the rotating column 30 to rotate self, the rotating column 30 drives the spur gear 29 to rotate, and during the rotation of the spur gear 29, the first rack 15 and the second rack 16 at both ends are respectively driven to move towards each other. The storage groove 31 accommodates and limits the sliding of the first rack 15 and the second rack 16, and the first rack 15 and the second rack 16 respectively drive the scale plate 14 to slide synchronously towards both ends, so as to make the scale plate 14 abut against both ends of the inner wall of the upper impeller disc 4, thereby ensuring that the angle positioning piece 5 and the impeller bottom disc 7 and the upper impeller disc 4 are in the same axial position. Moreover, since the depths of the impeller blades 6 inserted into the positioning grooves 10 of the angle positioning piece 5 are the same, the circumferential positions of the impeller blades 6 between the impeller bottom disc 7 and the upper impeller disc 4 are the same. After positioning the impeller blades 6, the impeller blades 6 are fixed between the upper impeller disc 4 and the impeller bottom disc 7 by welding to realize the positioning and assembly of the impeller assembly. Then, the first mold body 1 and the second mold body 8 are demolded, and the impeller assembly is taken out.

[0049] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes may be made therein without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A positioning tool for a glass fiber reinforced plastic centrifugal fan impeller, comprising a mold body and an impeller assembly, characterized in that: The mold body comprises a first mold body (1) and a second mold body (8) that can be molded together. The impeller assembly comprises an impeller upper plate (4) and an impeller bottom plate (7). A plurality of impeller blades (6) are arranged between the impeller upper plate (4) and the impeller bottom plate (7). An angle positioning piece (5) is arranged in the impeller assembly. A plurality of positioning grooves (10) that are compatible with the impeller blades (6) are evenly arranged on the angle positioning piece (5). The angle positioning piece (5) is also provided with umbrella-shaped positioning grooves that can be compatible with impeller blades (6) of different sizes. The umbrella-shaped structure comprises a plurality of struts (13) that can be extended synchronously, the ends of the struts (13) are rotatably connected to inner groove sliders (12) that are slidably connected to the angle positioning pieces (5), the inner groove sliders (12) are respectively provided with positioning pins (26) that are slidably connected to the positioning grooves (10), and the upper end of the impeller chassis (7) is also provided with a centering structure that can center the angle positioning piece (5) at the center of the impeller upper plate (4), and the centering structure comprises a pair of target plates (14) that can be slidably arranged toward each other; The first mold body (1) and the second mold body (8) are respectively provided with a semicircular mold hole (32), a plurality of positioning blocks (2) are evenly arranged in the semicircular mold hole (32), and the first mold body (1) and the second mold body (8) are respectively provided with a groove (9) on the opposite ends of the surfaces, and a pair of mold holes (3) are arranged in the groove (9); The umbrella-shaped structure further comprises a screw (23) rotatably connected to the center position of the angle positioning piece (5); a sleeve (22) is provided at the upper end of the angle positioning piece (5); a screw barrel (24) threadably connected to the screw (23) is fixedly connected to the inner wall of the sleeve (22); a plurality of indexing grooves (34) are evenly arranged on the outer circumference of the sleeve (22); the support rod (13) is rotatably connected in the indexing groove (34); the other end of the support rod (13) is rotatably connected to the inner groove slider (12); the upper end of the screw (23) is fixedly connected to a support rod (11); the support rod (11) is provided with the centering structure; The centering structure further comprises an annular column (19), the lower end of which is provided with a rotating drum (27) rotatably connected to the support rod (11), a storage tank (31) being provided in the annular column (19), the two ends of which are respectively slidably connected to a first rack (15) and a second rack (16), a rotating column (30) rotatably connected to the annular column (19) being provided at the center of the storage tank (31), a spur gear (29) being fixedly connected to the rotating column (30), the two ends of which are respectively meshed with the first rack (15) and the second rack (16), a worm gear (18) being coaxially provided with the spur gear (29) being fixedly connected to the rotating column (30), a worm gear (20) meshing with the worm gear (18) being rotatably connected to the annular column (19), and the ends of the first rack (15) and the second rack (16) being respectively fixedly connected to the target plate (14).

2. The positioning fixture for a glass fiber reinforced plastic centrifugal fan impeller according to claim 1, characterized in that: Both ends of the storage tank (31) are respectively provided with splicing blocks (28) fixedly connected to the annular column (19), and the first rack (15) and the second rack (16) are respectively provided with sliding pins (17) slidably connected to the inner wall of the splicing block (28).

3. The positioning fixture for a glass fiber reinforced plastic centrifugal fan impeller according to claim 1, characterized in that: The positioning grooves (10) are evenly arranged on the angle positioning piece (5), and the inner wall of the inner groove slider (12) is slidably connected with the positioning pin (26).

4. The positioning fixture for a glass fiber reinforced plastic centrifugal fan impeller according to claim 3, characterized in that: The upper end of the positioning latch (26) is fixedly connected to a blocking disk (25), and the diameter of the blocking disk (25) is greater than the inner groove width of the inner groove slider (12).

5. The positioning tool for a glass fiber reinforced plastic centrifugal fan impeller according to claim 1, characterized in that: The upper and lower ends of the impeller blades (6) are respectively welded to the opposite surfaces of the impeller upper plate (4) and the impeller bottom plate (7).

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