Adjustable clamping tool for machining rotor cooling fan blade

Abstract

The utility model discloses an adjustable clamping tool for rotor cooling fan blade processing, which comprises a base, a sliding block, an expansion ring and a bolt, the base is an arc strip structure matched with a cooling fan blade handle, the top of the base is in sliding connection with the bottom of the sliding block, the top of the sliding block is provided with a frustum matched with an assembly hole of the cooling fan blade handle, and the expansion ring is arranged in the frustum. The expansion ring is of a cylindrical structure with the inner circle face being a conical face, the outer circle face of the expansion ring is in clearance fit with the assembly hole, at least two lower kerfs are formed in the side wall of the bottom of the expansion ring in the circumferential direction, the conical face of the expansion ring is in interference fit with the frustum, a threaded hole is formed in the frustum, and the bolt is matched with the threaded hole in the frustum. The inner taper hole of the expansion ring and the frustum on the sliding block are attached and extruded, the outer circle of the expansion ring exerts pressure on the inner wall of the cooling fan blade combining hole after the expansion ring is expanded, namely circumferential extrusion force from inside to outside is formed for fixing, and therefore clamping of the cooling fan blade is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical manufacturing machine tool machining operation technical field, particularly to a rotor cooling fan blade processing adjustable clamping tool. BACKGROUND

[0002] The thermal power generator set is a set that uses coal, oil or combustible gas as fuel to heat water in a boiler, increases the temperature of the water, and then uses steam with certain pressure to push the air turbine to generate electricity. The rotor of the thermal power generator is one of the most important components in the thermal power generator, and its structure, material and manufacturing process determine the performance and service life of the generator. Therefore, when selecting and using the rotor, attention should be paid to its quality and reliability to ensure the normal operation and safe production of the thermal power generator.

[0003] The upper end of the rotor of the thermal power generator is provided with a cooling fan blade. During rotation of the rotor, axial airflow is formed through the action of the cooling fan blade to cool the rotor. The cooling fan blade is made of aluminum alloy, and its structure is shown in Figure 6 The handle is an arc-shaped strip structure, and two assembly holes are arranged on the handle. The blade and the handle are integrally formed, and the handle is provided with a corresponding arc-shaped groove at the handle to embed the rotor shaft neck circumference for circumferential positioning. The fan blade is clamped on the rotor through the clamping hole in the arc-shaped groove. The handle and the blade are integrated, and the handle supports and fixes the blade.

[0004] The conventional clamping method for the arc-shaped groove of the cooling fan blade adopts a special indexing tool, that is, one end of the handle is clamped and pressed, and the other end of the blade is clamped and pressed. The machining center respectively processes the thickness, shape and arc-shaped groove of the handle and the blade clamped on the indexing head, and then the fan blade is clamped and positioned by clamping the blade on both sides and clamping the handle on the jig through bolts. The clamping position during rough machining is processed.

[0005] After two processes, the fan blade is removed for measurement and inspection, and it is found that the arc-shaped groove of the handle will have a local shrinkage phenomenon. The groove width dimension will be reduced beyond the tolerance after shrinkage. Because of the cutting force and heat generated during the final processing of the bottom surface of the handle, local shrinkage of the arc-shaped groove is caused. When the blade is clamped, the blade will be clamped due to the clamping force, and pressure marks will be formed on the blade, causing size errors of the blade.

[0006] For the local size out-of-tolerance part, manual grinding is required to meet the tolerance requirements. However, after the deformation of the handle arc-shaped groove and local grinding, the overall arc degree cannot meet the shape error requirements, and the surface appearance quality is not satisfactory. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing a rotor cooling fan blade processing adjustable clamping tool, through the inner taper hole and the taper table on the slider of the expansion ring fit extrusion, the outer circle of the expansion ring after the expansion exerts pressure on the inner wall of the cooling fan blade, namely forms the circumferential extrusion from inside to outside and fixes, so that the clamping of the cooling fan blade is realized, through the clamping mode of the expansion from inside to outside, the workpiece does not deform when the arc groove of the cooling fan handle is finished, and the accuracy of the handle groove size and the arc is effectively ensured.

[0008] In order to realize the above-mentioned application purpose, the technical scheme of the utility model is as follows:

[0009] A rotor cooling fan blade processing adjustable clamping tool, including base, slider, expansion ring and bolt, the base is strip structure, and the top of base and the bottom of slider are slidably connected, and the top of slider is provided with the taper table matched with the cooling fan handle assembly hole, the expansion ring is the cylindrical structure with the inner circle face taper, and the outer circle face of expansion ring is matched with the assembly hole gap, and at least two lower cutting slots are arranged on the sidewall of the bottom of expansion ring along the circumferential direction, and the taper face of expansion ring is interference fitted with the taper table, and the screw hole is arranged in the taper table, and the bolt is matched with the screw hole in the taper table.

[0010] The expansion ring is provided with one upper cutting slot in the middle of every two lower cutting slots, and the upper cutting slot is arranged on the sidewall of the top of expansion ring along the circumferential direction, and the inner taper hole of expansion ring and the taper table on the slider fit extrusion, and the upper cutting slot and the lower cutting slot are deformed and expanded at the same time, and the diameter of expansion ring is uniformly expanded, and the outer circle face of expansion ring and the inner wall of the cooling fan assembly hole form surface contact, and the clamping effect is better.

[0011] The upper cutting slot and the lower cutting slot are evenly arranged along the circumferential direction of the expansion ring.

[0012] The end of the upper cutting slot and the lower cutting slot is respectively provided with a stop slot hole, and the stop slot hole is communicated with the cutting slot.

[0013] The slider is provided with two, and each slider is provided with one taper table on the top, and the two sliders are slidably connected with the base.

[0014] The top of the base is provided with a guide rail, and the bottom of the two sliders is respectively provided with a sliding groove, and the guide rail and the sliding groove are slidably matched, the position of the taper table is adjusted by adjusting the position of the two sliders, and the clamping of the cooling fan blade with different center distance assembly holes is realized.

[0015] The height of the taper table combined with the expansion ring is lower than the thickness of the position of the cooling fan handle arc groove, and the size of the head of the bolt is smaller than the size of the handle assembly hole, when the rotor cooling fan blade processing adjustable clamping tool is used to clamp the cooling fan blade, the head of the bolt is located in the assembly hole, and the surface of the bolt is lower than the top surface of the handle after the bolt is tightened, and the machining interference is effectively avoided.

[0016] The utility model discloses a beneficial effect:

[0017] 1. In the utility model, through the inner taper hole of the expansion ring and the taper table on the upper slide block adhesion extrusion, the outer circle of the expansion ring exerts pressure on the inner wall of the cooling fan blade hole after expansion, that is, the circumferential extrusion force from inside to outside is formed to fix, so that the clamping of the cooling fan blade is realized, and the workpiece does not deform when the arc-shaped groove of the cooling fan handle is finished, the accuracy of the handle groove size and the arc is effectively ensured, the blade size error caused by the clamping of the blade two sides and the formation of the impression mark on the blade can be avoided, and the local shrinkage of the arc-shaped groove caused by the processing of the bottom surface of the cooling fan handle in the original processing process is avoided.

[0018] 2. In the utility model, one upper cutting slot is arranged in the middle of every two lower cutting slots, the upper cutting slot is arranged on the side wall of the top of the expansion ring in the circumferential direction, the inner taper hole of the expansion ring and the taper table on the upper slide block adhesion extrusion, the upper cutting slot and the lower cutting slot are deformed and expanded at the same time, the diameter of the expansion ring is uniformly expanded, the expansion ring and the inner wall of the cooling fan blade assembly hole form surface contact and expansion, and the clamping effect is better.

[0019] 3. In the utility model, the inner bolt and the screw hole on the taper table of the slide block are reliably connected, the bolt is tightened and is lower than the thickness of the handle of the cooling fan, and processing interference is effectively avoided, the slide block is adjusted in a certain range, and can be fixed by the inner hexagonal bolt and the base, the clamping and positioning of the assembly hole with different center distances are realized. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the adjustable clamping tool structure schematic view of the rotor cooling fan blade processing of the utility model.

[0021] Figure 2 It is the base structure schematic view of the utility model.

[0022] Figure 3 It is the adjustable slide block structure schematic view of the utility model.

[0023] Figure 4 It is the expansion ring structure schematic view of the utility model.

[0024] Figure 5 It is the expansion ring structure schematic view in the embodiment 2 of the utility model.

[0025] Figure 6 It is the cooling fan blade structure schematic view of the utility model.

[0026] The components are: 1. base; 2. slider; 3. expansion ring; 4. bolt; 5. cone; 6. lower slit; 7. upper slit; 8. threaded hole; 9. guide rail; 10. slide groove; 11. cooling fan blade; 12. blade holder; 13. blade; 14. arc groove; 15. assembly hole. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0028] Example 1

[0029] This embodiment provides a method such as Figures 1-4 The adjustable clamping tool for machining rotor cooling fan blades shown includes a base 1, a slider 2, an expansion ring 3, and a bolt 4. The base 1 has a strip-shaped structure, and its top is slidably connected to the bottom of the slider 2. The top of the slider 2 is provided with a truncated cone 5 that mates with the mounting hole 15 of the blade shank 12 of the cooling fan blade 11. The expansion ring 3 is a cylindrical structure with a conical inner surface. The outer surface of the expansion ring 3 is clearance-fitted with the mounting hole 15. At least two downward slits 6 are provided circumferentially on the side wall at the bottom of the expansion ring 3. The conical surface of the expansion ring 3 is interference-fitted with the truncated cone 5. A threaded hole 8 is provided inside the truncated cone 5. The bolt 4 mates with the threaded hole 8 inside the truncated cone 5.

[0030] In this embodiment, the structure of the cooling fan blade 11 is as follows: Figure 6 As shown, it includes a stalk 12 and a blade 13. The stalk 12 is an arc-shaped strip structure with two mounting holes 15. The blade 13 is fixedly connected to the stalk 12. An arc-shaped groove 14 is provided at the connection between the blade 13 and the stalk 12. The stalk 12 is provided with a corresponding arc-shaped groove 14 depending on the type of rotor, so as to be embedded in the circumference of the rotor journal for circumferential positioning. The cooling fan blade 11 is fastened to the rotor through the clamping hole in the arc-shaped groove 14.

[0031] In this embodiment, when machining the outer dimensions of both ends of the cooling fan blade 11 and the arc-shaped groove 14, the cone 5 on the slider 2 is placed into the assembly hole 15 of the cooling fan blade 11, the expansion ring 3 is placed from above the assembly hole 15, and the bolt 4 is screwed into the threaded hole 8 of the cone 5. As the bolt 4 is screwed in, the inner cone hole of the expansion ring 3 fits and presses against the cone 5 on the slider 2. After the expansion ring 3 is expanded, its outer circle applies pressure to the inner wall of the fitting hole of the cooling fan blade 11, that is, a circumferential extrusion force from the inside to the outside is formed to solidify it. The clamping method, which tightens from the inside out, ensures that the workpiece does not deform during the finishing of the arc groove 14 on the handle of the cooling fan blade 11. This effectively guarantees the accuracy of the groove size and curvature of the handle 12 and avoids the formation of indentations or marks on the blade 13 due to clamping the two sides of the blade 13, which would cause dimensional errors in the blade 13. At the same time, it avoids the local shrinkage of the arc groove 14 caused by the final machining of the bottom surface of the handle of the cooling fan blade 11 during the original machining process.

[0032] Example 2

[0033] The difference between this embodiment and Embodiment 1 is that, in this embodiment, as... Figure 5 As shown, an upper slit 7 is provided between every two lower slits 6 of the expansion ring 3. The upper slit 7 is provided circumferentially on the side wall at the top of the expansion ring 3. The upper slit 7 and the lower slit 6 are evenly arranged along the circumference of the expansion ring 3. A stop hole is provided at the end of the upper slit 7 and the lower slit 6, and the stop hole communicates with the slit. The rest of the structure is the same as in Embodiment 1.

[0034] In this embodiment, during the assembly of the cooling fan blade 11, an upper slit 7 is provided between every two lower slits 6. The upper slit 7 is circumferentially located on the side wall of the top of the expansion ring 3. The inner conical hole of the expansion ring 3 fits and presses against the cone 5 on the slider 2. The upper slit 7 and the lower slit 6 deform and expand simultaneously, pushing the diameter of the expansion ring 3 to expand uniformly. The outer circular surface of the expansion ring 3 forms surface contact with the inner wall of the assembly hole 15 of the cooling fan blade 11, resulting in better clamping effect. Furthermore, by setting the center line of the width direction of the stop slit to pass through the center of the stop slit, stress concentration can be prevented, avoiding deformation of the expansion ring 3 body.

[0035] Example 3

[0036] Compared with Embodiment 1, the difference in this embodiment is that there are two sliders 2, each slider 2 has a cone 5 on its top, the base 1 has a guide rail 9 on its top, and the bottom of the two sliders 2 are respectively provided with a sliding groove 10, with the guide rail 9 and the sliding groove 10 slidingly engaged; the rest of the structure is the same as in Embodiment 1.

[0037] In this embodiment, the position of the cone 5 is adjusted by adjusting the position of the two sliders 2, thereby achieving the clamping of the cooling fan blades 11 with different center distances from the assembly holes 15.

[0038] Embodiment 4

[0039] The difference between the present embodiment and Embodiment 1 is that, in the present embodiment, the height of the frustum 5 after being combined with the ring 3 is lower than the thickness of the position of the curved groove 14 of the blade handle 12 of the cooling fan blade 11, the size of the head of the bolt 4 is smaller than the size of the assembly hole 15 of the blade handle 12, and the rest of the structure is the same as Embodiment 1.

[0040] In the present embodiment, the bolt 4 is a hexagonal bolt 4, and when the adjustable clamping tool for processing the rotor cooling fan blade 11 is used to clamp the cooling fan blade 11, the head of the bolt 4 is located in the stepped hole, and after the bolt 4 is tightened, the surface of the bolt 4 is lower than the top surface of the blade handle 12, effectively avoiding processing interference.

[0041] It can be understood that the present application is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope of protection of the present application.

Claims

1. A rotor cooling fan blade machining adjustable clamping tool, characterized in that: The utility model relates to a cooling fan blade assembly structure, including base (1), slider (2), ring (3) and bolt (4), base (1) is strip structure, and the top of base (1) is slidably connected with the bottom of slider (2), and the top of slider (2) is provided with the taper (5) that is matched with the assembly hole (15) of cooling fan blade (11) handle (12), the ring (3) is the cylindrical structure of inner circular surface presents taper, and the outer circular surface of ring (3) is matched with the assembly hole (15) clearance, and the sidewall on the bottom of ring (3) is provided with at least two lower slits (6) along the circumference, and the taper of ring (3) is matched with the taper (5) interference, and the taper (5) is provided with threaded hole (8) in, and the bolt (4) is matched with the threaded hole (8) in the taper (5).

2. The tooling assembly of claim 1, wherein: The ring (3) is provided with a slit (7) between every two lower slits (6) on the sidewall of the top of the ring (3).

3. The tooling assembly of claim 2, wherein: The slit (7) and the lower slit (6) are evenly arranged along the circumferential direction of the ring (3).

4. The tooling assembly of claim 2, wherein: The slit (7) and the lower slit (6) are provided with a stop hole at the end, respectively, and the stop hole is communicated with the slit.

5. The tool as set forth in claim 2, wherein: The slider (2) is provided with two, and each slider (2) is provided with a taper (5) on the top, and the two sliders (2) are slidably connected with the base (1) respectively.

6. The tool as set forth in claim 5, characterized in that: The base (1) is provided with a guide rail (9) on the top, and the two sliders (2) are respectively provided with a sliding groove (10) on the bottom, and the guide rail (9) is slidably matched with the sliding groove (10).

7. The tool as set forth in claim 2, wherein: The height of the taper (5) combined with the ring (3) is lower than the thickness of the arc-shaped groove (14) of the handle (12) of the cooling fan blade (11), and the head size of the bolt (4) is smaller than the size of the assembly hole (15) of the handle (12).

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