A paint removing device for an exciter rotor shaft hole

Abstract

This utility model discloses a paint removal device for exciter rotor shaft holes, including a support component and a cutter head assembly. The support component includes a chassis, a support cylinder fixed to the top surface of the chassis, and an anti-drop mechanism fixed to the upper middle inner wall of the support cylinder. The cutter head assembly includes a cutter head extension rod and a cutting cutter head. The cutting cutter head includes a handle portion and a cutting edge portion. Several stepped cutting edges are arranged from bottom to top on the outer circumferential surface of the cutting edge portion. The cutter head extension rod is rigidly connected to the cutting cutter head by first inserting a positioning pin into the top inner hole of the handle portion, and then locking the positioning pin in the inner hole of the handle portion by installing two support screws one-to-one in the two support threaded holes of the handle portion. The exciter rotor sits on the top surface of the support cylinder; the cutting edge portion is inserted into the shaft hole of the exciter rotor, and the insulating paint in the shaft hole of the exciter rotor is cut by the pressure of a hydraulic press. This utility model can quickly and conveniently remove the insulating paint in the shaft hole of the exciter rotor.

Description

Technical Field

[0001] This utility model relates to a paint removal device for the rotor shaft hole of an exciter. Background Technology

[0002] In current generator manufacturing processes, impregnation is a core process. Insulating varnish fills the gaps and interlayer air between the stator and rotor coils, and after curing, forms a continuous and dense varnish film to eliminate the risk of air gap discharge and improve insulation strength. Simultaneously, it bonds loose wires into a unified structure, enhancing resistance to electromagnetic vibration. While both the stator and rotor require overall impregnation and drying, the exciter rotor and main rotor use a separate impregnation process, resulting in residual insulating varnish in the shaft hole fitting slots of the exciter rotor, especially around ventilation holes and slot wedge edges. If this residual varnish is not removed, the thickened varnish film will cause the shaft hole fitting tolerances to exceed limits, making assembly impossible. Furthermore, the hardness of the cooled varnish film increases more than three times due to the glass transition temperature of epoxy resin, significantly increasing the difficulty of removal. Because the exciter rotor's shaft hole contains keyways, the paint film cannot be removed using machine tools. It must be removed manually using hooks and scrapers, point by point, from the shaft hole and the narrow keyways. This process takes over 60% of the time. If any paint film (thickness > 0.1mm) is missed in the shaft hole or keyways, affecting dynamic balance, the rework rate reaches 25%. Removal must be completed within the 70℃ temperature window after exiting the oven (when the paint film is semi-cured); exceeding this time will increase the removal time many times over. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a paint removal device for the exciter rotor shaft hole, which can quickly and conveniently remove most of the residual insulating paint in the exciter rotor shaft hole, greatly improving the overall paint removal efficiency.

[0004] The purpose of this utility model is achieved as follows: a paint removal device for the rotor shaft hole of an exciter, comprising a support member and a cutter head assembly; wherein,

[0005] The support includes a chassis, a support cylinder fixed to the top surface of the chassis, and an anti-fall mechanism fixed to the upper middle inner wall of the support cylinder; the outer diameter of the support cylinder is larger than the diameter of the shaft hole of the exciter rotor but smaller than the outer diameter of the iron core of the exciter rotor.

[0006] The cutter head assembly includes a cutter head extension rod and a cutting cutter head; wherein...

[0007] A positioning pin extends coaxially from the center of the lower end face of the cutter head extension rod;

[0008] The cutting head includes a shank portion and a cutting edge portion; the shank portion is a thin cylinder with an inner diameter adapted to the diameter of the positioning pin on the cutting head extension rod, and two support threaded holes are symmetrically and radially opened at the upper part near the top of the shank portion; the diameter of the cutting edge portion is larger than the outer diameter of the shank portion, and several layers of stepped cutting edges of the same height are arranged from bottom to top on the outer circumference of the cutting edge portion, the diameter of the lowest cutting edge precisely matches the diameter of the shaft hole of the exciter rotor, and the diameter of the next lower cutting edge to the uppermost cutting edge decreases by 0.03 to 0.07 mm respectively;

[0009] The tool head extension rod is rigidly connected to the cutting tool head by first inserting the positioning pin into the top inner hole of the tool holder, and then installing two support screws one-to-one in the two support threaded holes of the tool holder to lock and fix the positioning pin in the inner hole of the tool holder.

[0010] The exciter rotor and the support cylinder are coaxially mounted on the top surface of the support member; the cutting edge of the cutter head assembly is coaxially inserted into the shaft hole of the exciter rotor, and the pressure exerted by the hydraulic press on the top surface of the cutter head assembly cuts the lacquer inside the shaft hole of the exciter rotor.

[0011] The aforementioned paint removal device for the exciter rotor shaft hole, wherein the anti-fall mechanism consists of two anti-fall rods welded to the inner wall of the support cylinder and connected in a cross shape.

[0012] The aforementioned paint removal device for the exciter rotor shaft hole includes two lifting lugs that are centrally symmetrically fixed on the upper outer surface of the support cylinder.

[0013] In the aforementioned paint removal device for the exciter rotor shaft hole, the cutter extension rod is a hollow structure.

[0014] The aforementioned paint removal device for the exciter rotor shaft hole, wherein the knife edge portion is a hollow structure.

[0015] The features of the paint removal device for the exciter rotor shaft hole of this utility model are:

[0016] 1. The method of using a hydraulic press to drive a paint removal device to remove paint is used to replace the original manual paint removal method;

[0017] 2. The cutting head is easy to replace, and the cutting is fast, convenient and thorough, effectively avoiding the problems of incomplete, tedious and time-consuming manual paint removal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the paint removal device for the exciter rotor shaft hole of this utility model;

[0019] Figure 2 yes Figure 1AA direction view;

[0020] Figure 3 This is a top view of the support component in the paint removal device for the exciter rotor shaft hole of this utility model.

[0021] Figure 4 This is an axial cross-sectional view of the cutter head assembly in the paint removal device of this utility model. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Please see Figures 1 to 4 The paint removal device for the exciter rotor shaft hole of this utility model includes a support member 1 and a cutter head assembly 2.

[0024] The support component 1 includes a chassis 11, a support cylinder 12, two lifting lugs 13, and an anti-fall mechanism 14. The chassis 11 is made of 25mm thick Q235B steel plate, and its diameter and weight are designed to stably support heavy workpieces, ensuring zero displacement during paint removal operations. The support cylinder 12 is fixed on the top surface of the chassis 11. The support cylinder 12 is made of 45# steel cylinder with a wall thickness of 10mm, and the outer diameter of the support cylinder 12 is larger than the diameter of the shaft hole 100 of the exciter rotor 10 but smaller than the outer diameter of the iron core of the exciter rotor 10. The two lifting lugs 13 are symmetrically fixed on the upper outer surface of the support cylinder 12. The load-bearing capacity of the two lifting lugs 13 is ≥1 ton, which meets the safety requirements for workpiece lifting. The anti-fall mechanism 14 consists of two anti-fall rods welded to the middle and upper inner wall of the support cylinder 12 and connected in a cross shape.

[0025] The tool head assembly 2 includes a tool head extension rod 2A and a cutting tool head 2B; wherein,

[0026] A locating pin 20 with a diameter of Φ20mm extends coaxially from the center of the lower end face of the cutter head extension rod 2A; the cutter head extension rod 2A has a hollow structure, which can reduce its weight; the cutter head extension rod 2A is machined from a 40Cr rod and is hardened.

[0027] The cutting head 2B includes a shank portion 21 and a cutting edge portion 22. The shank portion 21 is a thin cylinder with an inner diameter adapted to the diameter of the locating pin 20 on the cutting head extension rod 2A, and two support threaded holes 210 are radially and symmetrically opened at the upper center near the top of the shank portion 21. The diameter of the cutting edge portion 22 is larger than the outer diameter of the shank portion 21. Six stepped cutting edges of the same height are arranged from bottom to top on the outer circumference of the cutting edge portion 22. The diameter of the lowest cutting edge is precisely matched with the diameter of the shaft hole 100 of the exciter rotor 10. The diameters of the next lower cutting edges decrease by 0.03 to 0.07 mm from the diameter of the highest cutting edge, with an optimal decrease of 0.05 mm. The cutting edge portion 22 is also a hollow structure, which can effectively reduce the overall weight of the cutting head 2B. The 2B cutting head is made of Cr12MoV high carbon tool steel (hardness reaches HRC58-62 after quenching) and precision turned to ensure high wear resistance and impact toughness.

[0028] The tool head extension rod 2A is rigidly connected to the cutting tool head 2B by first inserting the positioning pin 20 into the top inner hole of the tool holder 21 of the cutting tool head 2B, and then locking the positioning pin 20 into the inner hole of the tool holder 21 by installing two support screws 200 one by one in the two support threaded holes 210 of the tool holder 21.

[0029] The exciter rotor 10 is coaxially mounted on the top surface of the support cylinder 12; the cutting edge 22 of the cutter head assembly 2 is coaxially inserted into the shaft hole 100 of the exciter rotor 10, and the pressure applied to the top surface of the cutter head extension rod 2A by the hydraulic press cuts the paint in the shaft hole 100 of the exciter rotor 10.

[0030] The paint removal device for the exciter rotor shaft hole of this utility model, during paint removal operation, first places the support member 1 below the hydraulic press, then places the exciter rotor 10 on the top surface of the support cylinder 12, so that the iron core of the exciter rotor 10 sits on the top surface of the support cylinder 12, and the shaft hole 100 of the exciter rotor 10 is coaxial with the support cylinder 12; then, the positioning pin 20 at the lower end of the cutter extension rod 2A of the cutter head assembly 2 is inserted into the inner hole of the tool holder 21 of the cutting cutter head 2B, so that the cutter extension rod 2A and the cutting cutter head 2B are rigidly connected; then, two M8 high-strength support screws 200 are installed one-to-one in the two support threaded holes 210 of the tool holder 21 to lock and fix the positioning pin 20, preventing the cutter extension rod 2A is disengaged from the cutting head 2B; then, the cutting edge 22 of the cutting head 2B is inserted into the shaft hole 100 of the exciter rotor 10 to achieve pre-positioning of the cutting edge 22. Finally, the hydraulic press is started, and the cutting head 2B is pressed down by the hydraulic press to make the cutting edge 22 cut the paint film in the shaft hole 100 of the exciter rotor 10 in layers along the axis of the exciter rotor 10. The cutting depth of each layer is controlled within 0.05mm to avoid the silicon steel sheets of the exciter rotor 10 core from stacking and scattering due to sudden changes in cutting force (peak force > 200N), which would cause the workpiece to be scrapped and cause unnecessary losses. At the same time, the wear of the cutting edge per operation is reduced by more than 40%, extending the service life of the cutting head 2B and enabling multiple cycle operations. The cutting head extension rod 2A can effectively shorten the extension stroke of the hydraulic press, significantly shortening the actual paint removal time. The anti-drop mechanism 14 in the support cylinder 12 can effectively intercept the cutting head 2B, preventing the cutting head assembly 2 from falling into the support cylinder 12 after cutting, thus increasing unnecessary working time.

[0031] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A paint removal device for an exciter rotor shaft hole, comprising a support member and a cutter head assembly; characterized in that, The support includes a chassis, a support cylinder fixed to the top surface of the chassis, and an anti-fall mechanism fixed to the upper middle inner wall of the support cylinder; the outer diameter of the support cylinder is larger than the diameter of the shaft hole of the exciter rotor but smaller than the outer diameter of the iron core of the exciter rotor. The cutter head assembly includes a cutter head extension rod and a cutting cutter head; wherein... A positioning pin extends coaxially from the center of the lower end face of the cutter head extension rod; The cutting head includes a shank portion and a cutting edge portion; the shank portion is a thin cylinder with an inner diameter adapted to the diameter of the positioning pin on the cutting head extension rod, and two support threaded holes are symmetrically and radially opened at the upper part near the top of the shank portion; the diameter of the cutting edge portion is larger than the outer diameter of the shank portion, and several layers of stepped cutting edges of the same height are arranged from bottom to top on the outer circumference of the cutting edge portion, the diameter of the lowest cutting edge precisely matches the diameter of the shaft hole of the exciter rotor, and the diameter of the next lower cutting edge to the uppermost cutting edge decreases by 0.03 to 0.07 mm respectively; The cutting head extension rod is rigidly connected to the cutting head by first inserting the positioning pin into the top inner hole of the cutting head, and then installing two support screws one-to-one in the two support threaded holes of the cutting head to lock and fix the positioning pin in the inner hole of the cutting head. The exciter rotor and the support cylinder are coaxially mounted on the top surface of the support member; the cutting edge of the cutter head assembly is coaxially inserted into the shaft hole of the exciter rotor, and the pressure exerted by the hydraulic press on the top surface of the cutter head assembly cuts the lacquer inside the shaft hole of the exciter rotor.

2. The paint removal device for a field machine rotor shaft hole according to claim 1, characterized by, The anti-fall mechanism consists of two anti-fall rods welded to the inner wall of the support cylinder and connected in a cross shape.

3. The paint removal device for the exciter rotor shaft hole according to claim 1 or 2, characterized in that, Two lifting lugs are also symmetrically fixed to the upper outer surface of the support cylinder.

4. The paint removal device for the exciter rotor shaft hole according to claim 1, characterized in that, The cutter head extension rod has a hollow structure.

5. The paint removal device for the exciter rotor shaft hole according to claim 1, characterized in that, The cutting edge is a hollow structure.

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