A press-fitting tool for a generator shaft

Abstract

The present invention provides a press-fitting tool for a generator shaft, comprising: a base, two columns, a limit plate, two positioning arms, two torsion springs, and two cylindrical pins; a first step through hole is provided at the center of the base, the left and right sides of the base are respectively fixedly connected to the lower part of the column, a rectangular hole is provided on the upper part of the column, a positioning groove is provided at the tail end of the positioning arm, a positioning groove is provided, which is transparent from top to bottom, the bottom of the groove of the positioning groove has an inclined surface, and the front and rear side walls of the positioning groove are provided with a second positioning through hole, the tail end of the positioning arm is hinged to the rectangular hole, the torsion spring is placed in the positioning groove, the head end of the positioning arm is provided with a semicircular groove which is transparent from top to bottom, and the two semicircular grooves can form a closed circular hole; a second step through hole is provided at the center of the limit plate, and the first step through hole, the second step through hole and the closed circular hole are aligned with the same center line. The advantages of the present invention are: the overall structure is simple and novel, the operation is convenient and safe, the quality is stable and reliable, and the work efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of generator manufacturing, and in particular to a press-fitting tool for a generator shaft. Background Art

[0002] See also Figure 1 The generator rotor 200 without coils is composed of an iron core 201 and a rotating shaft 202. The iron core 201 is made of 0.5 mm thick silicon steel plates that are punched and laminated into one body. It has a central through hole 2011 and two magnetic poles 2012. The diameter of the magnetic pole 2011 is D (i.e., the outer diameter of the iron core). The rotating shaft 202 is inserted into the central through hole 2012 of the iron core 201. The outer side surface of the rotating shaft 202 has a large diameter section 202 from top to bottom. 1. A middle diameter section 2022, a tapered section 2023 and a small diameter section 2024. The middle diameter section 2022 and the central through hole 2012 of the iron core 201 are in interference fit. The rotating shaft 202 is pressed into the central through hole 2012 of the iron core 201 by a hydraulic press. The distance from the end face of the large diameter section 2021 exposed outside the iron core to the upper end face of the iron core 201 is H1, and the distance from the end face of the small diameter section 2024 exposed outside the iron core to the lower end face of the iron core 201 is H2. The current press-fitting method is: 1. Place the iron core of the generator rotor on the workbench; 2. Cover the limit plate on the top of the iron core; 3. Insert the small diameter section of the shaft downward into the inner hole of the limit plate to the center hole of the iron core; 4. Use one hand to straighten the shaft, and use the other hand to operate the hydraulic press switch to lower the piston rod to press the shaft into the center hole of the iron core. When the shaft is pressed into a certain depth, you must immediately withdraw your hand, otherwise an accident will occur. The defects of this press-fitting method are: 1. It is difficult to ensure that the shaft is in a vertical state by hand support and visual inspection, which is prone to quality problems such as rotor skew; 2. There are safety hazards. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a press-fitting tool for a generator shaft, so as to solve the defects of the existing press-fitting and improve the press-fitting efficiency.

[0004] The present invention is implemented as follows: A press-fitting tool for a generator shaft comprises: a base, two columns, a limit plate, two positioning arms, two torsion springs, and two cylindrical pins;

[0005] A first stepped through hole is provided at the center of the base, the left and right sides of the base are respectively fixedly connected to the lower part of the column, the upper part of the column is provided with a rectangular hole that is transparent to the left and right, and the front and rear side walls of the rectangular hole are both provided with first positioning through holes;

[0006] The tail end of the positioning arm is provided with a positioning groove which is transparent from top to bottom, the bottom of the positioning groove has an inclined surface, and the front and rear side walls of the positioning groove are provided with a second positioning through hole, the tail end of the positioning arm is hinged to the rectangular hole, the torsion spring is placed in the positioning groove, the cylindrical pin is passed through the first positioning through hole, the second positioning through hole and the inner hole of the torsion spring, one torsion arm of the torsion spring is clamped on the upper side wall of the rectangular hole, and the other torsion arm of the torsion spring is clamped on the inclined surface, and the head end of the positioning arm is provided with a semicircular groove which is transparent from top to bottom, and the two semicircular grooves can form a closed circular hole;

[0007] A second stepped through hole is provided at the center of the limiting plate, and the limiting plate is used to be placed between the base and the positioning arm. The first stepped through hole, the second stepped through hole and the enclosed circular hole are aligned with the same center line.

[0008] Furthermore, the left and right sides of the base are respectively provided with upper and lower transparent grooves, the bottom of the groove is provided with a first screw hole, the lower part of the column is provided with a connecting hole, the lower part of the column is embedded in the groove, and a bolt passes through the connecting hole and is locked and connected with the first screw hole.

[0009] Furthermore, both the front and rear sides of the lower part of the base are provided with platforms, and the platforms are provided with longitudinal through holes.

[0010] Furthermore, one of the positioning arms is provided with longitudinal grooves on both sides outside the notch of the semicircular groove, and the longitudinal grooves are clearance-matched with the head end of the other positioning arm.

[0011] Furthermore, a stepped annular groove is formed on the outer side surface of the limiting plate.

[0012] Furthermore, it also includes a pressure plate, a second screw hole is opened at the center of the upper end surface of the pressure plate, and the lower end surface of the pressure plate can push open the enclosed circular hole after moving downward and can be pressed on the limit plate.

[0013] Furthermore, the outer upper portion of the pressure plate has left and right cut edges.

[0014] The advantages of the present invention are that the first step through hole, the second step through hole and the enclosed circular hole cooperate to keep the rotating shaft in a vertical state. During the press-fitting process, the positioning arm can rotate in a reset manner under the action of the torsion spring to avoid interference with the press-fitting, and there is no need to manually hold the rotating shaft; the overall structure is simple and novel, the operation is convenient and safe, the quality is stable and reliable, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0016] Figure 1 The schematic diagram of the structure of the generator rotor without coil winding is the background technology.

[0017] Figure 2 It is a schematic structural diagram of the press-fitting tool of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the limiting plate in the present invention.

[0019] Figure 4 It is a structural schematic diagram of the base in the present invention.

[0020] Figure 5 It is a structural schematic diagram of the middle column of the present invention.

[0021] Figure 6 It is a schematic structural diagram of the positioning arm in the present invention.

[0022] Figure 7 It is a schematic structural diagram of the torsion spring in the present invention.

[0023] Figure 8 It is a schematic diagram of the press-fitting tool of the present invention in implementation state 1.

[0024] Fig. 9 It is a schematic diagram of the press-fitting tool of the present invention in the second implementation state.

[0025] Fig.10 It is a schematic diagram of the press-fitting tool of the present invention in the third implementation state.

[0026] Reference numerals: press-fitting tool 100; base 1; first stepped through hole 11; first large hole 111; first small hole 112; sink 12; first screw hole 121; platform 13; longitudinal through hole 131; column 2; connecting hole 21; bolt 22; rectangular hole 23; first positioning through hole 231; limiting plate 3; second stepped through hole 31; second large hole 311; second small hole 312; stepped annular groove 32; middle diameter section 321; small diameter section 322; large diameter section 323; positioning arm 4; positioning groove 41; inclined surface 411; second positioning through hole 42; Semicircular arc surface 43; upper plane surface 44 of the head; enclosed circular hole 45; semicircular groove 451; longitudinal groove 452; chamfered corner 4521; rear top surface 46; torsion spring 5; inner hole 51; one torsion arm 52; another torsion arm 53; cylindrical pin 6; pressure plate 7; second screw hole 71; trimming edge 72; generator rotor 200; iron core 201; central through hole 2011; magnetic pole 2012; rotating shaft 202; large diameter section 2021; middle diameter section 2022; tapered section 2023; small diameter section 2024; piston rod 300; end thread 301; nut 302. DETAILED DESCRIPTION

[0027] The embodiment of the present invention solves the technical problem of the prior art that the shaft needs to be manually supported during the press-fitting process by providing a press-fitting tool for the generator shaft, thereby achieving the technical effect of convenient and safe operation.

[0028] The technical solution in the embodiment of the present invention is to solve the above-mentioned problem, and the overall idea is as follows: the first step through hole, the second step through hole and the enclosed circular hole are cooperated to keep the rotating shaft in a vertical state. During the press-fitting process, the positioning arm can rotate in a reset manner under the action of the torsion spring to avoid interference with the press-fitting, and there is no need for manual hand-holding of the rotating shaft.

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Please refer to Figures 1 to 10 , a preferred embodiment of the press-fitting tooling for the generator shaft of the present invention.

[0031] The press-fitting tool 100 of the present invention comprises: a base 1, two columns 2, a limit plate 3, two positioning arms 4, two torsion springs 5, and two cylindrical pins 6; a first stepped through hole 11 is opened at the center of the base 1, and the first stepped through hole 11 is divided into a first large hole 111 and a concentric first small hole 112. The diameter of the first large hole 111 is equal to the diameter D of the magnetic pole 2012 of the iron core 201. Before the press-fitting work, the iron core 201 is placed in the first large hole 111 and is matched with a small gap. The diameter of the first small hole 112 is 0.5 to 1 mm larger than the outer diameter of the middle diameter section 2022 of the rotating shaft 202, and the depth L2 of the first small hole 112 is greater than the distance H2 from the end face of the small diameter section 2024 of the rotating shaft 202 after press-fitting to the lower end face of the iron core 201.

[0032] The left and right sides of the base 1 are respectively fixedly connected to the lower part of the column 2. Specifically, the left and right sides of the base 1 are respectively provided with a vertically transparent sinking groove 12, and the bottom of the sinking groove 12 is provided with a first screw hole 121. The lower part of the column 2 is provided with a connecting hole 21, and the lower part of the column 2 is embedded in the sinking groove 12. The column 2 is a rectangular column 2, and its width A1 is equal to the groove width A of the sinking groove 12 of the base 1. The hole position and number of the connecting hole 21 correspond to the first screw hole 121. The bolt 22 passes through the connecting hole 21 and is locked and connected with the first screw hole 121 to lock the column 2 on the base 1. The lower part of the base 1 has a platform 13 on both the front and rear sides, and the platform 13 is provided with a longitudinal through hole 131; when preparing for work, the base 1 can be fixed on the workbench of the press by bolts passing through the longitudinal through hole 131 or by a pressing plate.

[0033] A rectangular hole 23 which is transparent to the left and right is formed on the upper part of the column 2, and a first positioning through hole 231 is formed on the front and rear side walls of the rectangular hole 23; a positioning groove 41 which is transparent to the top and bottom is formed on the tail end of the positioning arm 4, and a slope 411 is formed on the lower part of the bottom of the positioning groove 41, and a second positioning through hole 42 is formed on the front and rear side walls of the positioning groove 41, wherein the tail end surface of the positioning arm 4 is a semicircular arc surface 43, which is concentric with the second positioning hole, and the center line of this concentricity is flush with the upper plane 44 of the head of the positioning arm 4. The tail end of the positioning arm 4 is hinged to the rectangular hole 23, the torsion spring 5 is placed in the positioning groove 41, the cylindrical pin 6 is passed through the first positioning through hole 231, the second positioning through hole 42 and the inner hole 51 of the torsion spring 5, one torsion arm 52 of the torsion spring 5 is clamped on the upper side wall of the rectangular hole 23, and the other torsion arm 53 of the torsion spring 5 is clamped on the inclined surface 411. Under the pre-torsion of the torsion spring 5, the rear top surface 46 of the positioning arm 4 is against the upper side wall of the rectangular through hole, so that the left and right positioning arms 4 are in a horizontally aligned position.

[0034] The head end of the positioning arm 4 is provided with a semicircular groove 451 which is transparent from top to bottom. The two semicircular grooves 451 can form a closed circular hole 45; the closed circular hole 45 is matched with the middle diameter section 2022 of the rotating shaft 202 with a small gap. One of the positioning arms 4 is provided with longitudinal grooves 452 on both sides outside the notch of the semicircular groove 451. The outer edge of the notch of the longitudinal groove 452 is a chamfered corner 4521. The longitudinal groove 452 is matched with the width of the head end of the other positioning arm 4 with a small gap. Such a design facilitates the horizontal alignment of the head ends of the two positioning arms 4. When the upper planes 44 of the heads of the two positioning arms 4 are subjected to the downward force of the pressure plate 7, the two positioning arms 4 will respectively rotate downward around their respective cylindrical pins 6. When the pressure on the upper planes 44 of the heads of the positioning arms 4 is released, the two positioning arms 4 are quickly reset under the action of the torsion spring 5 and reach a flush docking.

[0035] The center of the limiting plate 3 is provided with a second stepped through hole 31, which is divided into a second large hole 311 and a concentric second small hole 312. The diameter of the second large hole 311 is equal to the diameter D of the magnetic pole 2012 of the iron core 201. Before work, the limiting plate 3 is covered on the iron core 201 with clearance fit. The second small hole 312 is larger than the outer diameter of the large diameter section 2021 of the rotating shaft 202, and the depth L2 of the second small hole 312 is equal to the distance H1 from the end face of the large diameter section 2021 of the rotating shaft 202 to the upper end face of the iron core 201. The limiting plate 3 is used to be placed between the base 1 and the positioning arm 4. The first stepped through hole 11, the second stepped through hole 31 and the enclosed circular hole 45 are aligned with the same center line; that is, the center line of the enclosed circular hole 45 and the center lines of the first small hole 112 and the second small hole 312 must be on the same vertical line. The outer side of the limiting plate 3 is provided with a stepped annular groove 32. The stepped annular groove 32 has a middle diameter section 321 , a small diameter section 322 and a large diameter section 323 from top to bottom, which is convenient for grabbing the limiting plate 3 .

[0036] The pressure plate 7 is also provided with a second screw hole 71 at the center of the upper end surface of the pressure plate 7. The lower end surface of the pressure plate 7 can push open the enclosed circular hole 45 after moving downward and can press on the limit plate 3. The upper outer portion of the pressure plate 7 has left and right cut edges 72. The pressure plate 7 is connected to the end thread 301 of the hydraulic press piston rod 300 by the second screw hole 71 and is locked by the nut 302; during operation, the pressure plate 7 descends with the piston rod 300 and presses against the end face of the large diameter section 2021 of the rotating shaft 202, so that the middle diameter section 2022 of the rotating shaft 202 is gradually pressed into the central through hole 2011 of the iron core 201. When the shoulder at the intersection of the middle diameter section 2022 and the large diameter section 2021 of the rotating shaft 202 presses against the enclosed circular hole 45, the two positioning arms 4 begin to gradually rotate downward around their respective cylindrical pins 6, and the piston rod 300 continues to descend so that the lower end face edge of the pressure plate 7 presses against the upper plane of the heads of the two positioning arms 4, and the two positioning arms 4 continue to rotate downward.

[0037] The outer diameter of the pressure plate 7 must be such that when the pressure plate 7 is against the upper end surface of the limiting plate 3, the edge of the lower end surface of the pressure plate 7 is still pressed on the upper plane of the heads of the two positioning arms 4. The size of the middle diameter section 321 of the limiting plate 3 must be such that when the two positioning arms 4 are rotating downward, the middle diameter section 321 of the limiting plate 3 does not collide with the positioning arms 4. The height of the two positioning arms 4 must be such that the pressed finished rotor can be smoothly removed from the base 1. The distance between the pressure plate 7 and the two positioning arms 4 when it is in place must be such that the rotating shaft 202 can be smoothly inserted into the enclosed circular hole 45 formed by the two semicircular grooves 451.

[0038] Please refer to Figures 8 to 10 When the present invention is applied, the operation steps are as follows:

[0039] (1) Fix the base 1 on the workbench just below the hydraulic press piston rod 300.

[0040] (2) Connect the pressure plate 7 and the piston rod 300.

[0041] (3) Place the iron core 201 in the first large hole 111 at the center of the base 1.

[0042] (4) The second large hole 311 of the limiting plate 3 is facing downward and is placed on top of the iron core 201 .

[0043] (5) The small diameter section 2024 of the rotating shaft 202 is passed downward through the enclosed circular hole 45 and the second small hole 312 at the center of the limiting plate 3 in sequence, and is inserted into the central through hole 2011 of the iron core 201, so that the intersection of the tapered section 2023 and the middle diameter section 2022 of the rotating shaft 202 abuts against the edge of the hole of the central through hole 2011 of the iron core 201.

[0044] (6) Press the hydraulic press switch, and the pressure plate 7 gradually presses the middle diameter section 2022 of the rotating shaft 202 into the central through hole 2011 of the iron core 201 as the piston rod 300 descends, until the pressure plate 7 abuts against the upper end surface of the limit plate 3. Release the switch, and the pressure plate 7 will rise and return to its original position as the piston rod 300 rises, and the two positioning arms 4 rotate upward and return to their original positions under the action of their respective torsion springs 5. Then remove the limit plate 3 first, and then remove the press-fitted generator rotor 200 from the base 1, and the press-fitting work is completed.

[0045] The press-fitting tool for the generator shaft of the present invention has the advantages of simple and novel overall structure, convenient and safe operation, stable and reliable quality, and improved working efficiency of the shaft press-fitting.

[0046] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A press-fitting tool for a generator shaft, characterized in that: include: One base, two columns, one limit plate, two positioning arms, two torsion springs, and two cylindrical pins; A first stepped through hole is provided at the center of the base, the left and right sides of the base are respectively fixedly connected to the lower part of the column, the upper part of the column is provided with a rectangular hole that is transparent to the left and right, and the front and rear side walls of the rectangular hole are both provided with first positioning through holes; The tail end of the positioning arm is provided with a positioning groove which is transparent from top to bottom, the bottom of the positioning groove has an inclined surface, and the front and rear side walls of the positioning groove are provided with a second positioning through hole, the tail end of the positioning arm is hinged to the rectangular hole, the torsion spring is placed in the positioning groove, the cylindrical pin is passed through the first positioning through hole, the second positioning through hole and the inner hole of the torsion spring, one torsion arm of the torsion spring is clamped on the upper side wall of the rectangular hole, and the other torsion arm of the torsion spring is clamped on the inclined surface, and the head end of the positioning arm is provided with a semicircular groove which is transparent from top to bottom, and the two semicircular grooves can form a closed circular hole; A second stepped through hole is provided at the center of the limiting plate, and the limiting plate is used to be placed between the base and the positioning arm. The first stepped through hole, the second stepped through hole and the enclosed circular hole are aligned with the same center line.

2. A press-fitting tool for a generator shaft according to claim 1, characterized in that: The left and right sides of the base are respectively provided with up and down transparent grooves, the bottom of the groove is provided with a first screw hole, the lower part of the column is provided with a connecting hole, the lower part of the column is embedded in the groove, and a bolt passes through the connecting hole and is locked and connected with the first screw hole.

3. The press-fitting tool for the generator shaft according to claim 1, characterized in that: The front and rear sides of the lower part of the base are both provided with platforms, and the platforms are provided with longitudinal through holes.

4. The press-fitting tool for a generator shaft according to claim 1, characterized in that: One of the positioning arms is provided with longitudinal grooves on both sides outside the notch of the semicircular groove, and the longitudinal grooves are clearance-matched with the head end of the other positioning arm.

5. The press-fitting tool for the generator shaft according to claim 1, characterized in that: A stepped annular groove is provided on the outer side surface of the limiting plate.

6. The press-fitting tool for the generator shaft according to claim 1, characterized in that: It also includes a pressure plate, a second screw hole is opened at the center of the upper end surface of the pressure plate, and the lower end surface of the pressure plate can push open the enclosed circular hole and press on the limit plate after moving downward.

7. A press-fitting tool for a generator shaft according to claim 6, characterized in that: The outer upper portion of the pressure plate has left and right cut edges.

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