CN106911232B - Pressing device and pressing method for armature commutator - Google Patents

Abstract

The pressing method of armature commutator includes limiting the lower end of the wire head of the twisted armature semi-finished product, radially expanding, pressing the commutator into the shaft of the armature semi-finished product, limiting the radially expanded wire head and radially extruding the wire head into the groove of the commutator. And simultaneously, a pressing device of the armature commutator is also provided. The invention has the advantages of good quality and high production efficiency of the produced products.

Description

Pressing device and pressing method for armature commutator

Technical Field

The invention relates to a device and method for preparing a starter armature, and in particular to a device and method for pressing an armature commutator.

Background technique

The starting motor consists of three parts: an electromagnetic switch, a DC motor and a transmission mechanism. The DC motor is composed of a front cover, a rear cover, a brush holder, a stator and an armature. The armature includes a commutator 1, an iron core 2, a shaft 3 and a copper wire 4 (winding wire). The part of the iron core of the armature is equipped with a wire to realize the conversion of electrical energy into mechanical energy. The number of slots in the commutator is equal to the number of slots in the iron core, ranging from 13 to 37 slots. Different numbers of slots meet different power output requirements. The higher the slot fill rate (the sum of the cross-sectional area of the wire and the proportion of the core slot area) of the armature of the same volume, the greater the output power of the motor. Flat wires have a higher slot fill rate than round wires, so the armature designed with flat wires is more compact and has greater output performance. At the same time, it also poses higher challenges to the manufacturing process. The armature runs at high speed in the motor and is the most critical component that determines the reliability and life of the motor.

In the existing armature production process, the armature wires enter the commutator slots synchronously when the commutator is pressed into the shaft. Since the wires are affected by many factors when they are twisted, there are often position and shape errors in the twisted wires, resulting in misalignment between the wires and the commutator slots. Therefore, when pressing the commutator, the wires of the windings are often not easily pressed into the commutator slots, the wires are bent, or they are pressed off-center due to deformation of the wires after the windings are twisted and positioning deviations of the commutator, requiring rework or even scrapping. One of the existing solutions is to widen the width of the commutator slot to facilitate the entry of the winding wire, but this will inevitably increase the contact resistance between the winding wire and the commutator, affect the welding strength of the winding wire and the commutator, and reduce the quality of the armature; the second existing solution is to first expand the winding wire on a special expansion device after the head is twisted, then complete the pressing of the commutator on a special press, and finally press the winding wire into the commutator slot on a special shrinking machine. Since it is often impossible to ensure that the wire is pressed into the commutator slot at the same time, the contact resistance between each wire of the winding and the commutator will be inconsistent, thereby reducing the quality of the armature. In addition, this method requires three devices and three people to operate, with low production efficiency and high manufacturing cost.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a pressing method for an armature commutator, which can effectively ensure that the wire enters the commutator slot smoothly, greatly improves production efficiency and reduces manufacturing costs, while also ensuring that the starter performance is more stable and reliable.

The present invention also provides an armature commutator pressing device, through which the armature commutator pressing method can be better implemented, which can effectively ensure that the wire enters the commutator slot smoothly, greatly improves production efficiency and reduces manufacturing costs, and also ensures that the starter performance is more stable and reliable.

The technical solution adopted by the present invention to solve the above problems is:

The armature commutator pressing method is to limit the lower end of the wire head of the twisted armature semi-finished product and then expand it radially, then press the commutator into the shaft of the armature semi-finished product, and at the same time limit the radially expanded wire head and then radially squeeze it into the slot of the commutator.

The present invention accordingly provides a pressing device for an armature commutator, comprising:

A main body, wherein a cylindrical vertical through hole capable of accommodating the core bushing and the core seat is arranged in the middle, and a horizontal through hole is arranged in the lower part;

The core seat is placed at the lower part of the cylindrical through hole of the main body, and a cylindrical hole for accommodating the workpiece shaft is provided in the middle of the core seat. The workpiece shaft is inserted into the cylindrical hole to axially fix the workpiece;

The core seat guide sleeve includes a main body with a through hole in the middle and an axial guide portion provided with a hole wall, which is fixed to the upper part of the cylindrical through hole of the main body, and a part of it is sleeved outside the core seat, and the axial guide portion guides the core seat to move up and down;

The upper positioning ring is provided with the same number of slots as the commutator in the circumferential direction, and the slot width of the positioning ring is slightly larger than the slot width of the commutator, so that the workpiece wire can be limited in the slot and can be easily moved in the slot;

The lower positioning ring is provided with slots of the same number and width as the commutator in the circumferential direction, the slots can accommodate the workpiece wires, and the slot diameter is smaller than the slot diameter of the upper positioning ring;

The shrinking ring has a middle through hole with a truncated cone shape with a larger top and a smaller bottom, and a cylindrical shape at the bottom;

The limiting sleeve is arranged between the lower part of the copper wire of the semi-finished armature and the core seat, supporting the lower part of the semi-finished armature so that the wire does not contact the top surface of the core seat, ensuring that the lower part of the wire is not damaged;

The expanded tooth head is in the shape of a truncated cone with a larger top and a smaller bottom. Long groove teeth with the same number and width as the commutator are arranged circumferentially on the truncated cone, corresponding to the grooves of the upper positioning ring, the lower positioning ring and the shrinking ring;

Commutator pressure head, which presses the commutator into the workpiece shaft;

A commutator positioning assembly includes a commutator positioning body and a commutator positioning piece, a through hole for accommodating the commutator is arranged in the middle, and a commutator positioning piece is arranged around the through hole. After the commutator is placed in the through hole, it is axially guided by the commutator positioning piece;

A height adjusting member, the height difference between the position where the conductor is expanded and the position where the conductor is squeezed into the commutator is equal to the stroke of the conductor head shrinking, is placed in the transverse through hole of the main body, supports the core seat, and can be switched between two positions;

The fixing part, the lower section of the fixing part is movably fixed on the main body, the upper positioning ring, the lower positioning ring and the shrinking ring are placed on the main body from top to bottom in sequence, and the upper section of the fixing part movably fixes the upper positioning ring and the lower positioning ring; after the upper positioning ring is replaced with the commutator positioning assembly, it is also fixed by the upper section of the fixing part.

Preferably, the main body can be divided into a main body and a base, and the main body is fixed on the base, which is easy to manufacture and install.

Preferably, the core seat guide sleeve body and the axial guide portion are divided into two parts, which is easy to manufacture.

Preferably, the height adjustment member is a handle, which includes a hand-held portion and a rotating portion, the difference between the width and the height of the rotating portion is equal to the stroke of the wire head shrinkage, the rotating portion is placed in the transverse through hole of the main body and supports the core seat; in this way, the height of the rotating portion can be changed by conveniently rotating the handle rotating portion through the hand-held portion.

Preferably, the commutator positioning assembly is a split structure, which is divided into a commutator positioning ring, a commutator bushing, and a commutator positioning guide bar. The commutator bushing is arranged and fixed in the commutator positioning ring, and the commutator positioning guide bar is fixed on the inner wall of the commutator bushing and axially positions the commutator; this makes it easy to manufacture and install.

Preferably, a height adjustment member is also provided between the main body and the shrinking ring, and the adjustment member includes an adjusting screw and a nut. The nut is fixed on the top surface of the main body, and the screw is screwed on the nut. In this way, the height of the screw entering the nut can be changed by rotating the screw, thereby adjusting the height of the screw, that is, adjusting the distance between the shrinking ring and the main body to meet the change of the core height.

Preferably, vertical fixing grooves are provided on the outer peripheral surface of the main body and the outer peripheral surfaces of the upper positioning ring, the lower positioning ring and the commutator positioning assembly, and the fixing members are placed on the vertical fixing grooves and movably fixed.

Preferably, there are two fixing members distributed symmetrically in the circumferential direction, and the two fixing members are guide rails of different widths, so as to ensure the uniqueness of the positions of the lower locating ring, the upper locating ring and the commutator locating ring when in use, thereby playing an error-proofing role.

Preferably, the width of the rear section of the notch of the upper positioning ring is significantly larger than the notch of the commutator, so that when the upper positioning ring needs to be taken out, it is not hindered by the wire and is relatively easy.

More specifically, the pressing method of the armature commutator comprises the following steps:

(1) Place the height adjustment piece at the starting position in the transverse through hole of the main body, place the core seat in the cylindrical through hole and supported by the height adjustment piece, insert the upper part of the core seat into the core seat guide sleeve, and fix the core seat guide sleeve on the main body;

(2) Place the twisted armature semi-finished product into the core seat guide sleeve, and fix the shrinking ring, lower positioning ring, and upper positioning ring on the main body in sequence, so that the wire head of the component enters the groove of the upper positioning ring;

(3) Install the flared tooth head again, start the driver to press down the flared tooth head, and the wire head is squeezed out from the upper positioning ring groove under the force of the teeth of the flared tooth head, and the lower part of the wire enters the lower positioning ring groove;

(4) Take out the flared tooth head and the upper positioning ring, install the commutator positioning assembly at the position of the upper positioning ring, then put the commutator in the commutator positioning assembly, put the voltage changer pressure head on the commutator, start the driver to press the voltage changer, lower the height adjustment piece to another height, and squeeze the wire in the groove of the lower positioning ring through the inclined surface of the shrinking ring into the groove of the commutator at the same time;

(5) Move the height adjustment piece to the starting position to eject the workpiece.

The advantages of the present invention are:

1. The present invention divides the pressing of the commutator and the insertion of the wire into the commutator slot into two steps, and the wire is always positioned by the tooling, eliminating position and shape errors, thereby ensuring good consistency of performance parameters during armature production, and greatly reducing rework rate and scrap rate.

2. Since the copper wire is precisely positioned and pressed into the commutator slot by the lower positioning ring, the slot width of the commutator can be close to or the same as the wire width or diameter, reducing the contact resistance between the wire and the commutator, ensuring the welding firmness and ensuring the performance of the starter.

3. Pressing the wire into the commutator slot is completed by only one shrinking ring, which achieves synchronous pressing and completely solves the problem of commutator slot change caused by asynchronous wire pressing.

4. Only one ordinary press (pneumatic or hydraulic press) is used to make the wires after the winding is twisted enter the slots of the commutator smoothly at the same time. Only one person is needed to operate, which greatly improves production efficiency, saves floor space and reduces manufacturing costs.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of an armature workpiece and a commutator of a commutator to be pressed used in the present invention.

FIG. 2 is a schematic diagram of the exploded structure of the pressure commutator device according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of the commutator device according to an embodiment of the present invention when expanding the conductor.

FIG. 4 is a schematic structural diagram of the commutator pressing device according to an embodiment of the present invention when performing commutator pressing.

FIG. 5 is a schematic structural diagram of a commutator positioning assembly according to an embodiment of the present invention.

FIG6 is a schematic diagram of the structure of the embodiment of the present invention when the commutator is initially pressed.

FIG. 7 is a schematic diagram of the structure of the commutator conductor when expanding the opening according to an embodiment of the present invention.

FIG8 is a state diagram of the commutator at the start of the pressure changer according to the embodiment of the present invention.

FIG. 9 is a state diagram of the embodiment of the present invention when the commutator is pressed and completed.

FIG. 10 is a state diagram of an embodiment of the present invention when the pressed commutator workpiece is withdrawn.

FIG. 11 is a workpiece diagram of the completed commutator according to an embodiment of the present invention.

12 is a diagram showing the corresponding positions of the conductor and the upper positioning ring when the conductor expansion begins according to an embodiment of the present invention.

13 is a diagram showing the corresponding positions of the conductor and the lower positioning ring when the conductor expansion is completed according to an embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The general shape of the armature workpiece 222 shown in Figure 1, which has a head 122 of a copper wire 120, an iron core 123 with an opening 1231 in the middle, and a wire end 121 at the bottom, needs to be pressed into the commutator 114 on the shaft 124 and the head 122 wire is positioned in the slot 1141 of the commutator 114.

As shown in Figures 2, 3 and 4, the armature commutator pressing device provided by the present invention comprises the following components:

A bottom plate 1, which supports the main body 2 and is fixed to the main body 2;

The body 2 has a cylindrical vertical through hole 25 in the middle that can accommodate the core bushing 3 and the core seat 5, a horizontal through hole 22 in the lower part, and vertical fixing grooves 26 and 27 on the outer surface of the body;

The core bushing 3 is placed in the upper part of the cylindrical through hole 25 of the body 2 and fixed to the outer body 2 by bolts 21. An opening 31 for guiding the core bars 4 is also provided on the inner circumference of the core bushing 3.

The core guide bar 4 is divided into two parts, one part 41 is placed in the opening 31 of the core bushing 3, and the other part 42 corresponds to the core opening and is placed in the opening 1231 of the core 123 to circumferentially position and axially guide the core 123;

The core seat 5 is placed at the lower part of the cylindrical through hole 25 of the body 2. A cylindrical hole 51 for accommodating the axis of the workpiece 222 is provided in the middle of the core seat 5. The axis of the workpiece 222 is inserted into the cylindrical hole 51 to axially fix the workpiece 222.

The limiting sleeve 6 is arranged between the lower portion 121 of the copper conductor 120 of the workpiece 222 and the core seat 5, and supports the lower portion 121 of the copper conductor 120 of the workpiece 222 so that it does not contact the plane 52 of the core seat 5, and ensures that the end portion 121 of the copper conductor 120 is not damaged;

The height adjustment handle 7 includes a hand-held portion 72 and a rotating portion 71. The difference between the width 712 and the height 711 of the rotating portion 71 is equal to the stroke of the head 122 of the copper conductor 120 shrinking. The rotating portion 71 is placed in the transverse through hole 22 of the body 2 and supports the core seat 5.

The shrinking ring 8 has a middle through hole: a truncated cone-shaped shrinking groove 81 with a larger upper portion and a smaller lower portion for accommodating the wire, and a cylindrical hole 82 at the lower portion. The upper truncated cone-shaped shrinking groove 81 can limit the expansion size of the end 122 of the copper wire 120, and the lower cylindrical hole 82 can press the head 122 of the expanded copper wire 120 into the corresponding notch 1141 of the commutator 114 when the head 122 moves downward due to shrinkage.

The upper positioning ring 9 is provided with slots 91 of the same number and slightly wider than the slots of the commutator in the circumferential direction. The width of the slots 91 is suitable to accommodate the copper wires 120 of the workpiece 222 without too much gap. In this way, when the head 122 of the copper wire 120 of the workpiece 222 is expanded, the upper copper wire 120 can smoothly enter the slot 91, so that the lower copper wire 120 is introduced into the lower positioning ring 10 to prevent the copper wire 120 from being misplaced, as shown in FIG. 12 ; in this embodiment, the rear section width 92 of the slot 91 is significantly larger than the commutator slot, so that when the upper positioning ring 9 is taken out, it will not be hindered by the copper wire 120 in the slot 91 and can be easily taken out;

The lower positioning ring 10 is provided with slots 101 having the same number and width as the slots of the commutator. The slots 101 accommodate the copper wires 120 of the workpiece 222. The lower positioning ring 10 serves to accurately position the heads 122 of the copper wires 120 into the slots 101 of the lower positioning ring 10, as shown in FIG. 13, to ensure that the heads 122 of the copper wires 120 accurately enter the slots 1141 of the commutator 114;

A commutator bushing 12 is arranged in the commutator positioning ring 11. The commutator positioning ring 11 and the commutator bushing 12 are connected at two side portions 111 and 112 via a connecting piece 113. The commutator positioning ring 11 fixes the commutator bushing 12, and the commutator bushing 12 axially positions the commutator.

The commutator positioning guide bar 13 plays the role of circumferential positioning with the notch 1141 of the commutator 114;

The flared tooth head 14 is provided with a tooth portion 142 corresponding to the notch 91 of the upper positioning ring 9. The number of teeth of the flared tooth head 14 is the same as the number of slots of the commutator. The notch 91 of the upper positioning ring 9 is initially guided and positioned. At the beginning, the head 122 of the copper wire 120 is directly in the notch 91 of the upper positioning ring 9, as shown in FIG12. Under the pressure of the press, the tooth portion 142 of the flared tooth head 14 pushes the head 122 of the copper wire 120 into the notch 101 of the lower positioning ring 10, as shown in FIG13. The flared tooth head 14 degree 141 plays the role of expanding the head 122 of the copper wire 120 and is limited by the inclined surface 081 of the shrinking ring 8.

The pressure changer head 15 is used to press the commutator 114 into the shaft end 124 of the workpiece 222;

The guide rails 16 and 17 have limiting parts 163 and 173 on the upper part, respectively, which are respectively placed in the vertical fixing grooves 26 and 27 on the outer surface of the body, the notches 102 and 103 of the lower positioning ring 10, the notches 92 and 93 of the upper positioning ring 9, and the notches 114 and 115 of the commutator positioning ring 11, and are fixed to the body 2 by bolts 161, 162, 171 and 172, and the relative positions of the lower positioning ring 10, the upper positioning ring 9, the commutator positioning ring 11 and the body 2 are accurately positioned by the limiting parts 163 and 173 of the guide rails 16 and 17;

An adjusting member 18 is also provided on the main body 2, and the adjusting member 18 includes an adjusting screw 182 and a nut 181. The nut 181 is fixed on the top surface of the main body 2, and the screw 182 is screwed on the nut 181, as shown in FIG. 2. In this way, by rotating the screw 182 to change the height at which the screw enters the nut 181, the height of the screw 182 is adjusted, that is, the distance between the lower positioning ring 10 and the main body 2 is adjusted to meet the change in the height 1232 of the iron core 123, as shown in FIG. 6.

The width of the guide rail 16 is different from that of the guide rail 17, which plays a role in preventing errors.

The core bushing 3 and the core guide bar 4 may also be integrated.

The commutator positioning ring 11, the commutator bushing 12, and the commutator positioning guide bar 13 constitute a commutator positioning assembly, as shown in FIG5, and the three can also be designed as one body.

The method for pressing an armature commutator using the above commutator pressing device comprises the following steps:

(1) The rotating portion 71 of the height adjustment handle 7 is placed in the transverse through hole 22 of the body 2. At this time, the height 711 of the rotating portion of the height adjustment handle is facing upward. The core seat 5 is placed in the cylindrical through hole 25 and supported by the height adjustment handle 7. The upper part of the core seat 5 is placed in the limiting sleeve 6, which is then inserted into the core seat guide sleeve 3. The core seat guide sleeve 3 is fixed to the body 2 by bolts 21, as shown in FIG6 ;

(2) Place the armature semi-finished product 222 into the core seat guide sleeve, place the shrinking ring 8, the lower positioning ring 10, and the upper positioning ring 9 in sequence under the restriction of the guide rails 16 and 17 above the body 2, and place the guide rails 16 and 17 into the vertical fixing grooves 26 and 27 of the body 2 respectively and fix them with bolts 161, 162, 171, and 172, and then make the wire head 122 of the armature semi-finished product 222 enter the notch 91 of the upper positioning ring 9, see Figures 6 and 12;

(3) Install the flared tooth head 14, start the press (not shown) to press down the flared tooth head 14, and the wire head 122 is squeezed out of the notch 91 of the upper positioning ring under the force of the teeth of the flared tooth head and enters the notch 101 of the lower positioning ring 10, see Figures 7 and 13;

(4) Take out the expanded tooth head 14 and the upper positioning ring 9, install the commutator positioning assembly at the position of the upper positioning ring, then put the commutator 114 into the commutator positioning assembly, put the commutator pressure head 15 on the commutator 114, start the press to press the commutator 114, and the commutator 114 enters the workpiece shaft, see Figure 8, the height adjustment handle 7 rotates the rotating part 71 through the hand-held part 72 to turn the width 712 part upward, and start the press again. During the downward movement, the expanded wire 122 passes through the cylindrical hole 82 of the shrinking ring and is squeezed into the notch 1141 of the commutator 114 at the same time, see Figure 9;

(5) The rotating part of the height adjustment handle 7 is rotated to a height 711 by the hand-held part 72 of the height adjustment handle 7 to eject the workpiece 444 after the commutator 114 is pressed, as shown in FIGS. 10 and 11 , thereby completing the commutator pressing work.

Claims (7)

1. A method for pressing an armature commutator, characterized in that: the lower end of the wire head of the twisted armature semi-finished product is restricted and then radially expanded, and then the commutator is pressed into the shaft of the armature semi-finished product, and at the same time, the radially expanded wire head is restricted and then radially squeezed into the slot of the commutator, and the armature commutator pressing method includes the following steps: (1) Place the height adjustment piece at the starting position in the transverse through hole of the main body, place the core seat in the cylindrical through hole and supported by the height adjustment piece, insert the upper part of the core seat into the core seat guide sleeve, and fix the core seat guide sleeve on the main body; (2) Place the twisted armature semi-finished product into the core seat guide sleeve, and fix the shrinking ring, lower positioning ring, and upper positioning ring on the main body in sequence, so that the wire head of the component enters the groove of the upper positioning ring; (3) Install the flared tooth head again, start the driver to press down the flared tooth head, and the wire head is squeezed out from the upper positioning ring groove under the force of the teeth of the flared tooth head, and the lower part of the wire enters the lower positioning ring groove; (4) Take out the flared tooth head and the upper positioning ring, install the commutator positioning assembly at the position of the upper positioning ring, then put the commutator in the commutator positioning assembly, put the voltage changer pressure head on the commutator, start the driver to press the voltage changer, lower the height adjustment piece to another height, and squeeze the wire in the groove of the lower positioning ring through the inclined surface of the shrinking ring into the groove of the commutator at the same time; (5) Move the height adjustment piece to the starting position to eject the workpiece. 2. A pressing device for an armature commutator, characterized in that it comprises: A main body, wherein a cylindrical vertical through hole capable of accommodating the core bushing and the core seat is arranged in the middle, and a horizontal through hole is arranged in the lower part; The core seat is placed at the lower part of the cylindrical through hole of the main body, and a cylindrical hole for accommodating the workpiece shaft is provided in the middle of the core seat. The workpiece shaft is inserted into the cylindrical hole to axially fix the workpiece; The core seat guide sleeve includes a main body with a through hole in the middle and an axial guide portion provided with a hole wall, which is fixed to the upper part of the cylindrical through hole of the main body, and a part of it is sleeved outside the core seat, and the axial guide portion guides the core seat to move up and down; The upper positioning ring is provided with the same number of slots as the commutator in the circumferential direction, the slot width of the positioning ring is slightly larger than the slot width of the commutator, and the slots can accommodate the workpiece wire; The lower positioning ring is provided with slots of the same number and width as the commutator in the circumferential direction, the slots can accommodate the workpiece wires, and the slot diameter is smaller than the slot diameter of the upper positioning ring; The shrinking ring has a middle through hole with a truncated cone shape with a larger top and a smaller bottom, and a cylindrical shape at the bottom; The limiting sleeve is arranged between the lower part of the copper conductor of the semi-finished armature and the core seat, and supports the lower part of the semi-finished armature so that the conductor does not contact the top surface of the core seat; The expanded tooth head is in the shape of a truncated cone with a larger top and a smaller bottom. Long groove teeth with the same number and width as the commutator are arranged circumferentially on the truncated cone, corresponding to the grooves of the upper positioning ring, the lower positioning ring and the shrinking ring; Commutator pressure head, which presses the commutator into the workpiece shaft; A commutator positioning assembly includes a commutator positioning body and a commutator positioning piece, a through hole for accommodating the commutator is arranged in the middle, and a commutator positioning piece is arranged around the through hole. After the commutator is placed in the through hole, it is axially guided by the commutator positioning piece; A height adjusting member, the height difference between the position where the conductor is expanded and the position where the conductor is squeezed into the commutator is equal to the stroke of the conductor head shrinking, is placed in the transverse through hole of the main body, supports the core seat, and can be switched between two positions; The fixing part, the lower section of the fixing part is movably fixed on the main body, the upper positioning ring, the lower positioning ring, and the shrinking ring are placed on the main body from top to bottom in sequence, and the upper section of the fixing part movably fixes the upper positioning ring and the lower positioning ring; after the upper positioning ring is replaced with the commutator positioning assembly, it is also fixed by the upper section of the fixing part; The main body can be divided into a main body and a base, the main body is fixed on the base; the core seat guide sleeve main body and an axial guide part. 3. The pressing device of the armature commutator according to claim 2 is characterized in that: the height adjustment member is a handle, which includes a hand-held part and a rotating part, the difference between the width and the height of the rotating part is equal to the stroke of the wire head shrinkage, and the rotating part is placed in the transverse through hole of the body and supports the core seat. 4. The pressing device for the armature commutator according to claim 2 is characterized in that a height adjustment member is also arranged between the body and the shrinking ring, the adjustment member comprises an adjustment screw and a nut, the nut is fixed on the top surface of the body, and the screw is screwed on the nut. 5. The pressing device for the armature commutator according to claim 2 is characterized in that vertical fixing grooves are provided on the outer peripheral surface of the body and the outer peripheral surfaces of the upper positioning ring, the lower positioning ring and the commutator positioning assembly, and the fixing parts are placed on the vertical fixing grooves and movably fixed. 6. The pressing device of the armature commutator according to claim 2 is characterized in that: the commutator positioning assembly is divided into a commutator positioning ring, a commutator bushing, and a commutator positioning guide bar, the commutator bushing is arranged and fixed in the commutator positioning ring, and the commutator positioning guide bar is fixed on the inner wall of the commutator bushing and axially positions the commutator. 7. The pressing device for the armature commutator according to claim 2 is characterized in that the width of the rear section of the notch of the upper positioning ring is significantly larger than the notch of the commutator.