An outer rotor magnetic steel sheet assembling machine and assembling method

Abstract

The application provides an outer rotor magnetic steel sheet assembling machine and assembling method. The assembling machine structure comprises a plurality of horizontal feeding channels, a mandrel provided with a plurality of positioning grooves, a pull rod arranged in the mandrel, a top block provided with an outer taper surface pressure head at the top end of the pull rod and arranged in the mandrel, and a fixed seat of a magnetic steel tube provided with an inner taper surface matched with the outer taper surface; the positioning groove is provided with a through hole; the output end of each feeding channel is respectively butted with each positioning groove; all the positioning grooves automatically and synchronously adsorb a magnetic steel sheet at the outermost side of the output end of each feeding channel; the mandrel is driven to move upwards, so that the positioning groove is inserted into the magnetic steel tube; the pull rod in the mandrel is driven to move downwards along the axial direction relative to the mandrel, the top block moves outward along the radial direction and extends out of the through hole through the cooperation of the inner taper surface and the outer taper surface, the magnetic steel sheet adsorbed in the positioning groove is pushed outward, and the magnetic steel sheet is adsorbed on the inner wall of the magnetic steel tube, that is, the synchronous assembling of a group of magnetic steel sheets in one magnetic steel tube is completed. The application greatly improves the assembling efficiency.

Description

Technical Field

[0001] This invention relates to the field of motor manufacturing technology, and in particular to an external rotor magnet assembly machine and assembly method. Background Technology

[0002] The rotor of an external rotor brushless motor typically consists of a rotor shaft (including a magnet tube and rotor core) and magnets attached to the inner wall of the rotor shaft, with the magnets evenly spaced along the circumference. Traditional manual assembly requires applying adhesive to the inner wall of the rotor shaft before attaching the magnets. To control the spacing between the magnets, spacers are needed to separate adjacent magnets, resulting in a complex and inefficient process.

[0003] To address this, existing automated assembly machines, such as the rotor magnet sheet assembly machine disclosed in patent CN202110973236.3, include a transport fixture. The transport fixture transports the rotor core to the assembly station, where a lifting mechanism lifts the rotor core to a position where it mates with the magnet sheet fixture. A pushing mechanism then pushes the magnet sheets from the fixture into the magnet sheet assembly holes of the rotor core. The magnet sheet fixture is rotatably mounted on a rotating mechanism, which drives it to a feeding mechanism. The feeding mechanism assembles the magnet sheets into the fixture, while a driving mechanism rotates the fixture. This fully automated assembly equipment, integrating transport, feeding, and assembly, replaces traditional manual assembly methods, significantly improving assembly efficiency.

[0004] However, the problem is that the pusher mechanism pushes the magnets to the assembly position of the rotor core. Since there are multiple assembly positions along the circumference, a tooling rotation mechanism must be set up to drive the rotor core to rotate. After the pusher mechanism pushes the current magnet to the current assembly position, the rotation mechanism rotates by a fixed angle to align the next assembly position with the output end of the pusher mechanism. Then the pusher mechanism pushes the next magnet to the next assembly position. Only after repeating the action can the assembly of all the magnets on a rotor core be completed. The drive mechanism is multi-layered and the motion mode is complex, which means that the production efficiency still cannot meet the requirements of mass production. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an external rotor magnet sheet assembly machine and assembly method, aiming to improve assembly efficiency by optimizing the structure and motion mode of the assembly machine and drive mechanism.

[0006] The technical solution adopted in this invention is as follows:

[0007] This invention provides an external rotor magnet sheet assembly machine, comprising:

[0008] The feeding assembly is fixed on the upper part of the frame and has multiple feeding channels for stacking closely arranged magnetic steel sheets to be assembled. The multiple feeding channels are horizontally arranged and evenly distributed in a radial pattern with the mandrel as the center.

[0009] The mandrel is movable in a vertical direction. The lower part of the mandrel is a guide part, and the upper part is an adsorption part. The outer diameter of the adsorption part is not greater than the outer diameter of the guide part. The adsorption part has a cavity inside. The outer surface of the adsorption part is provided with several positioning grooves evenly spaced along the circumference, which are used to dock with the output ends of the multiple feeding channels respectively, so as to adsorb the outermost magnetic steel sheet arranged at each output end. The depth of the positioning groove is greater than the thickness of one magnetic steel sheet and less than the thickness of two magnetic steel sheets. The positioning groove is provided with through holes.

[0010] A pull rod is coaxially sleeved inside the spindle and can move axially relative to the spindle. A pressure head is fixed at the top of the pull rod and is located inside the cavity. The outer surface of the pressure head is an outer conical surface.

[0011] The top block is located outside the pressure head in the cavity and multiple top blocks are evenly arranged along the circumference. The structure of the top block includes a limiting part and a pushing part. The inner surface of the limiting part is an inner conical surface that mates with the outer conical surface. When the pull rod moves axially relative to the spindle, the top block can push the magnetic steel sheet adsorbed in the positioning groove outward through the inner conical surface and the outer conical surface in a radial direction through the through hole.

[0012] A fixing base is fixed vertically above the mandrel to fix the magnetic steel tube to be assembled; when the mandrel moves linearly in the vertical direction, the adsorption part can extend into the interior of the magnetic steel tube.

[0013] The further technical solution is as follows:

[0014] The structure of the drive mechanism that drives the spindle to move linearly in the vertical direction and drives the pull rod to move axially relative to the spindle is as follows: it includes a movable plate, which is fixedly connected to one end of the spindle, and a first cylinder is fixedly mounted on the movable plate, the piston rod output end of which is connected to one end of the pull rod.

[0015] Below the movable plate is a fixed plate, on which a second cylinder is mounted. The piston rod output end of the cylinder is connected to the movable plate. The movable plate and the fixed plate are connected by a linear bearing and a guide post that cooperates with the linear bearing. The guide post is fixed on the frame.

[0016] The feeding assembly has the following structure: it includes a lower groove plate and an upper groove plate located above the lower groove plate. The upper groove plate is provided with a plurality of upper groove holes, and the lower groove plate is provided with a plurality of lower groove holes. The upper groove holes and lower groove holes are positioned vertically and vertically, respectively limiting the two ends of the magnet sheet to be assembled in the length direction, thereby forming the feeding channel.

[0017] The lower slot plate is fixed to the top of the frame, and several equal-height blocks are provided between the upper slot plate and the lower slot plate, and are connected by locking components.

[0018] The lower groove plate, the upper groove plate, and the frame are respectively opened with corresponding holes to form a guide channel for the mandrel to move. The gap between the inner wall of the guide channel and the outer wall of the guide part of the mandrel is no greater than the thickness of a magnet sheet.

[0019] The lower groove plate is provided with a guide sleeve that mates with the guide portion;

[0020] The top of the guide portion forms a limiting step surface, which serves as the bottom limiting surface of the positioning groove of the adsorption portion.

[0021] The bottom of the cavity of the adsorption section is provided with a limiting step surface two, which serves as a limiting surface for the movement of the pressure head.

[0022] The fixing seat is fixed to the upper groove plate. The center of the fixing seat has a relief hole for the mandrel to pass through. A positioning step surface is formed on the inner wall of the relief hole for positioning the magnetic steel tube.

[0023] The through hole is an elongated hole, the outline of the pushing part of the top block matches the elongated hole, and the outer side of the pushing part is an arc surface that matches the inner side of the magnet sheet; the size of the limiting part is larger than the size of the elongated hole.

[0024] It also includes a pressing mechanism, which includes a pressing block, the upper end of which is connected to the piston rod output end of the fixed third cylinder, and the lower end face is used to cooperate with the magnetic steel sheet to be assembled, pressing it tightly in the fixed seat.

[0025] The present invention also provides a method for assembling external rotor magnet sheets, wherein the assembly is performed using the aforementioned external rotor magnet sheet assembly machine, comprising:

[0026] Multiple feeding channels are used to stack closely arranged magnetic steel sheets, which are stacked along the thickness direction, and the output end of each feeding channel is respectively connected to the positioning groove of the mandrel adsorption part.

[0027] All positioning slots automatically and synchronously adsorb the outermost magnetic steel sheet located at the output end of each feeding channel.

[0028] The magnetic steel tube to be assembled is fixed in the fixing base;

[0029] The drive spindle moves vertically, causing the adsorption part to extend into the interior of the magnetic steel tube;

[0030] The pull rod inside the drive spindle moves axially downward relative to the spindle. Through the inner conical surface of the top block and the outer conical surface of the pressure head, the top block moves radially outward and extends out of the through hole of the positioning groove, pushing the magnetic steel sheet adsorbed in the positioning groove outward, so that the magnetic steel sheet is adsorbed on the inner wall of the magnetic steel tube, thus completing the synchronous assembly of a set of magnetic steel sheets in a magnetic steel tube.

[0031] The tie rod inside the drive spindle moves axially upward relative to the spindle.

[0032] The drive spindle moves downward in the vertical direction, causing the positioning groove of the adsorption part to return to the position where it docks with the output end of each feeding channel. All positioning grooves automatically and synchronously adsorb the outermost magnetic steel sheet located at the output end of each feeding channel. When the magnetic steel sheet is adsorbed into the positioning groove, the top block moves radially inward under the thrust of the magnetic steel sheet and returns from the through hole to the cavity of the adsorption part, so that the inner conical surface and the outer conical surface fit together again.

[0033] The beneficial effects of this invention are as follows:

[0034] This application achieves one-time assembly of a group (multiple) of magnets on the inner wall of a magnet tube using a small number of drive mechanisms and a simple motion module, without the need for a rotation mechanism, making it easy to operate and with high assembly accuracy.

[0035] The feeding channel of this application achieves automatic movement of the magnetic steel sheet within the feeding channel through the adsorption force between the positioning groove and the magnetic steel sheet at the output end, eliminating the need for additional drive mechanisms for feeding. The structural design is reasonable, saving space and cost.

[0036] This application, through the rational design of the guide groove depth and the mandrel guide channel size, can ensure that the adsorption part of the mandrel carries only one magnet piece in each cycle, resulting in high positioning accuracy.

[0037] The feeding channel of this application can be adjusted by adjusting the height of the equalizing blocks and the spacing between the upper and lower slot plates, thereby achieving the dimensional adjustment of the feeding channel along the height direction. This makes it suitable for feeding various types of magnetic steel sheets with different lengths and dimensions, and it has strong applicability.

[0038] Other features and advantages of this application will be set forth in the following description or may be learned by practicing the invention. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural diagram of the assembly machine according to an embodiment of the present invention.

[0040] Figure 2 This is a cross-sectional view of the assembly machine in operation according to an embodiment of the present invention.

[0041] Figure 3 for Figure 2 Enlarged view of section A.

[0042] Figure 4 This is a three-dimensional structural diagram of the mandrel according to an embodiment of the present invention.

[0043] Figure 5 This is a schematic diagram of the distribution structure of the top block in an embodiment of the present invention.

[0044] Figure 6 This is a schematic diagram of the assembly structure of the mandrel and the top block according to an embodiment of the present invention.

[0045] Figure 7 for Figure 1 Enlarged view of section B in the middle.

[0046] In the diagram: 1. Third cylinder; 2. Pressure block; 3. Upper groove plate; 4. Lower groove plate; 5. Frame; 6. Mandrel; 7. Fixed base; 8. Movable plate; 9. First cylinder; 10. Fixed plate; 11. Second cylinder; 12. Guide post; 13. Magnet tube; 14. Guide sleeve; 15. Tie rod; 16. Leveling block; 17. Magnet sheet; 18. Pressure head; 19. Top block; 20. Linear bearing; 31. Upper slot; 41, Lower slot; 61, Adsorption part; 62, Guide part; 63, Limiting step surface two; 171, Current magnet; 172, Next magnet; 181, Outer conical surface; 191, Limiting part; 192, Pushing part; 181, Outer conical surface; 610, Positioning slot; 611, Through hole; 621, Limiting step surface one; 701, Positioning step surface; 1910, Inner conical surface. Detailed Implementation

[0047] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0048] Example 1

[0049] See Figures 1 to 5 The external rotor magnet sheet assembly machine of this embodiment includes:

[0050] The feeding assembly is fixed on the upper part of the frame 5 and has multiple feeding channels for stacking closely arranged magnetic steel sheets to be assembled. The multiple feeding channels are horizontally arranged and evenly distributed in a radial pattern with the spindle 6 as the center.

[0051] The mandrel 6 is movable in a vertical direction. The lower part of the mandrel 6 is a guide part 62, and the upper part is an adsorption part 61. The outer diameter of the adsorption part 61 is not greater than the outer diameter of the guide part 62. The adsorption part 61 has a cavity inside. The outer surface of the adsorption part 61 is provided with a plurality of positioning grooves 610 evenly spaced along the circumference, which are used to dock with the output ends of the plurality of feeding channels respectively, so as to adsorb the outermost magnetic steel sheet arranged at each output end respectively. The depth of the positioning groove 610 (i.e., along the radial direction of the mandrel 6) is greater than the thickness of one magnetic steel sheet and less than the thickness of two magnetic steel sheets. The positioning groove 610 is provided with a through hole 611.

[0052] A pull rod 15 is coaxially sleeved inside a spindle 6 and can move axially relative to the spindle 6. A pressure head 18 is fixed at the top of the pull rod 15 and is located inside the cavity. The outer surface of the pressure head 18 is an outer conical surface 181.

[0053] The top block 19 is located outside the pressure head 18 in the cavity and multiple top blocks are evenly arranged along the circumference. The structure of the top block 19 includes a limiting part 191 and a pushing part 192. The inner surface of the limiting part 191 is an inner conical surface 1910 that cooperates with the outer conical surface 181. When the pull rod 15 moves axially relative to the spindle 6, the top block 19 can push the magnet 17 adsorbed in the positioning groove 610 outward through the inner conical surface 1910 and the outer conical surface 181 in cooperation.

[0054] The fixing seat 7 is fixed vertically above the mandrel 6 to fix the magnet tube 13 to be assembled; when the mandrel 6 moves linearly in the vertical direction, the adsorption part 61 can extend into the magnet tube 13.

[0055] The structure of the drive mechanism that drives the spindle 6 to move linearly in the vertical direction and drives the pull rod 15 to move axially relative to the spindle 6 is as follows: it includes a movable plate 8, which is fixedly connected to one end of the spindle 6. A first cylinder 9 is fixedly mounted on the movable plate 8, and its piston rod output end is connected to one end of the pull rod 15.

[0056] Below the movable plate 8 is a fixed plate 10, on which a second cylinder 11 is mounted. The piston rod output end of the cylinder 11 is connected to the movable plate 8. The movable plate 8 and the fixed plate 10 are connected by a linear bearing 20 and a guide post 12 that cooperates with the linear bearing 20. The guide post 12 is fixed on the frame 5.

[0057] In this embodiment of the external rotor magnet sheet assembly machine, according to actual needs, nine positioning slots 610 are provided on the adsorption part 61 of the mandrel 6, which respectively connect to the output ends of the nine feeding channels, such as... Figure 1 As shown by the middle arrow, under the adsorption force of the positioning groove 610, the magnet moves along... Figure 1 The direction indicated by the middle arrow is along the length of the feeding channel, moving towards the output end of the channel (intermittently) to the position of the mandrel 6 at the center. Each channel is attracted one piece at a time, and then the tightly packed magnetic steel sheets in the channel move as a whole towards the output end by a distance equal to the thickness of one magnetic steel sheet. Nine magnetic steel sheets can be attracted simultaneously through the nine positioning slots 610 of the attraction part 61 of the mandrel 6. The mandrel 6 carrying nine magnetic steel sheets moves vertically and enters the magnetic steel tube 13 that has been pre-loaded into the fixed seat 7. Then, the axial movement of the pull rod 15, through the conical (sloping) engagement between the pressure head 18 and the top block 19, converts the axial movement of the pressure head 18 into the radial movement of the top block 19. Figure 3As indicated by the middle arrow, when the top block 19 passes through the through hole 611 on the positioning groove 610, it pushes the magnetic steel sheet 17 adsorbed on the positioning groove 610 radially to the inner wall of the magnetic steel tube 13, thus completing the synchronous assembly of a group of magnetic steel sheets in a magnetic steel tube. The motion mechanism of this embodiment is simple, with only two vertical drive mechanisms, eliminating the need for rotary drive and other drives, making it convenient to operate and highly efficient.

[0058] Specifically, since the magnetic steel sheet is a permanent magnet, the mandrel 6 in this embodiment is made of a metal material that can be attracted by a permanent magnet. When the straight-line docking distance is the shortest, it can be automatically attracted into the positioning groove 610.

[0059] See Figure 1 The feeding assembly can be specifically structured as follows: including a lower groove plate 4 and an upper groove plate 3 located above the lower groove plate 4. The upper groove plate 3 is provided with a number of upper groove holes 31, and the lower groove plate 4 is provided with a number of lower groove holes 41. The upper groove holes 31 and the lower groove holes 41 are positioned vertically and vertically, respectively limiting the two ends of the magnet sheet 17 to be assembled in the length direction, thereby forming a feeding channel.

[0060] See Figure 2 The lower slot plate 4 is fixed to the top of the frame 5. Several equal height blocks 16 are provided between the upper slot plate 3 and the lower slot plate 4 and are connected by locking components.

[0061] This embodiment allows for adjustment of the feeding channel's dimensions along the height direction by adjusting the height of the leveling blocks and the spacing between the upper and lower slot plates. This makes it suitable for feeding various types of magnetic steel sheets with different lengths. In use, the magnetic steel sheets can be neatly stacked in the channel manually or using other mechanical equipment. They are positioned by the upper and lower slot holes and moved at the output end by suction force. This eliminates the need for additional drive mechanisms, optimizing the structural design and saving space and cost.

[0062] See Figure 3 , Figure 4 Holes are opened on the lower groove plate 4, the upper groove plate 3 and the frame 5 respectively, and the positions are corresponding to form a guide channel for the mandrel 6 to move. The gap between the inner wall of the guide channel and the outer wall of the guide part 62 of the mandrel 6 is no greater than the thickness of a magnetic steel sheet. The lower groove plate 4 is provided with a guide sleeve 14 that cooperates with the guide part 62.

[0063] like Figure 4 , Figure 5 and Figure 6As shown, the top of the guide portion 62 forms a limiting step surface 621, which serves as the bottom limiting surface of the positioning groove 610 of the adsorption portion 61; the through hole 611 can specifically be an elongated hole, and the outline of the pushing portion 192 of the top block 19 matches the elongated hole. The outer surface of the pushing portion 192 (named the pushing outer surface 1920) can specifically be set as an arc surface that matches the inner surface of the magnet sheet 17; the size of the limiting portion 191 is larger than the size of the elongated hole, and when the top block 19 moves radially (see... Figure 5 When indicated by the middle arrow, see Figure 6 The pusher 192 can pass through the through hole 611 on the positioning groove 610. After the outer side 1920 of the pusher extends out, it pushes out the magnet. The size of the limiting part 191 is larger than the size of the long waist hole, so it will not pass through the through hole 611, thereby limiting the stroke of the pusher 192.

[0064] The preferred independent settings for each top block are as follows: Figure 6 As shown. Because the outer surface 1920 of the pusher block engages with the magnetic steel sheet, after the magnetic steel sheet is pushed out and assembled with the magnetic steel tube, the pressure head resets. Due to the unidirectional nature of the conical surface engagement, the pusher block 19 will not automatically reset at this time. Instead, it will need to be pushed by the new magnetic steel sheet at the output end of the feeding channel through the next positioning groove 610 to reset, so that the inner conical surface 1910 is once again in contact with the outer conical surface 181 of the pressure head 18. That is, the movement of the pusher block depends on the pushing of the magnetic steel sheet and the pressure head.

[0065] like Figure 3 As shown, the bottom of the cavity of the adsorption part 61 is provided with a limiting step surface 63, which serves as a limiting surface for the movement of the pressure head 18.

[0066] like Figure 7 As shown, the fixing seat 7 is fixedly connected to the upper groove plate 3. The center of the fixing seat 7 has a relief hole through which the spindle 6 passes. A positioning step surface 701 is formed on the inner wall of the relief hole for positioning the magnetic steel tube 13.

[0067] like Figure 1 As shown, in order to further enhance the stability of the magnetic steel tube during assembly, the structure of the assembly machine in this embodiment also includes a pressing mechanism, which includes a pressing block 2, the upper end of which is connected to the piston rod output end of the fixed third cylinder 1, and the lower end face is used to cooperate with the magnetic steel sheet to be assembled and press it into the fixed seat 7.

[0068] The third cylinder 1 is specifically fixed on the mounting plate, and the mounting plate is fixedly connected to the upper slot plate 3 by a support rod.

[0069] Example 2

[0070] This embodiment provides a method for assembling external rotor magnet plates, using the assembly machine described in Embodiment 1 for assembly, including:

[0071] S1. The magnetic steel sheets 17 are stacked in close arrangement using multiple feeding channels. The magnetic steel sheets 17 are stacked along the thickness direction. The output end of each feeding channel is respectively connected to the position of each positioning groove 610 of the adsorption part 61 of the spindle 6.

[0072] S2. All positioning slots 610 automatically and synchronously adsorb a magnetic steel sheet 17 located on the outermost side of the output end of each feeding channel.

[0073] S3. Fix the magnet tube 13 to be assembled in the fixing base 7;

[0074] S4. Drive the spindle 6 to move vertically, so that the adsorption part 61 extends into the magnetic tube 13;

[0075] S5. The pull rod 15 inside the drive spindle 6 moves downward relative to the spindle 6 along the axial direction. The inner conical surface 1910 of the top block 19 cooperates with the outer conical surface 181 of the pressure head 18. The top block 19 moves outward radially and extends out of the through hole 611 of the positioning groove 610, pushing the magnetic steel sheet 17 adsorbed in the positioning groove 610 outward, so that the magnetic steel sheet 17 is adsorbed on the inner wall of the magnetic steel tube 13, thus completing the synchronous assembly of a set of magnetic steel sheets 17 in a magnetic steel tube 13.

[0076] S6. The tie rod 15 inside the drive spindle 6 moves upward relative to the spindle 6 along the axial direction.

[0077] S7. The drive spindle 6 moves downward in the vertical direction, so that the positioning groove 610 of the adsorption part 61 returns to the position where it docks with the output end of each feeding channel. All positioning grooves 610 automatically and synchronously adsorb the outermost magnetic steel sheet 17 located at the output end of each feeding channel. When the magnetic steel sheet 17 is adsorbed into the positioning groove 610, the top block 19 moves radially inward under the thrust of the magnetic steel sheet 17 and returns from the through hole 611 to the cavity of the adsorption part 61, so that the inner conical surface 1910 and the outer conical surface 181 are in contact again.

[0078] Repeating steps S3 to S7 will achieve automatic assembly.

[0079] In this embodiment, after S2 is completed, the positioning groove 610 will attract the current magnetic steel piece 171 into it, as can be seen from [reference needed]. Figure 6 For ease of illustration, Figure 6 The diagram only illustrates the state of one of the positioning slots 610 loaded with a magnetic steel sheet. At this point, due to the magnetism of the magnetic steel sheet, it can be seen that the next magnetic steel sheet and all subsequent magnetic steel sheets in the feeding channel are in a tightly attached state. When S4 is executed, as the drive spindle 6 moves vertically, since the depth of the positioning slot 610 can only accommodate a maximum of one magnetic steel sheet, it is blocked by the upper slot plate 3. (See [reference]). Figure 3This prevents the next magnet from being carried up. In this embodiment, as the mandrel 6 moves upwards, since the mandrel is entirely made of metal, the next magnet 172 and subsequent magnets will be attracted to the guide portion 62. During execution of S7, the next magnet 172 and subsequent magnets slide relative to the guide portion 62 due to the obstruction of the lower slot plate 4. When they slide into the positioning groove 610, they are attracted there, indicating that S2 has been completed.

[0080] This application achieves one-time assembly of a group (multiple) of magnets on the inner wall of a magnet tube through a small number of drive mechanisms and a simple motion mechanism. No rotation mechanism is required. It is applicable to the assembly of various types of magnets, with high flexibility, convenient operation, and high assembly accuracy.

[0081] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An external rotor magnet sheet assembly machine, characterized in that, include: The feeding assembly is fixed on the upper part of the frame (5) and has multiple feeding channels for stacking closely arranged magnetic steel sheets to be assembled. The multiple feeding channels are horizontally arranged and evenly distributed in a radial pattern with the mandrel (6) as the center. The mandrel (6) can move vertically. The lower part of the mandrel (6) is a guide part (62), and the upper part is an adsorption part (61). The outer diameter of the adsorption part (61) is not greater than the outer diameter of the guide part (62). The adsorption part (61) has a cavity inside. The outer side of the adsorption part (61) is provided with a number of positioning grooves (610) evenly spaced along the circumference, which are used to dock with the output ends of the multiple feeding channels respectively, so as to adsorb the outermost magnetic steel sheet arranged at each output end respectively. The depth of the positioning groove (610) is greater than the thickness of one magnetic steel sheet and less than the thickness of two magnetic steel sheets. The positioning groove (610) is provided with a through hole (611). A pull rod (15) is coaxially sleeved inside the spindle (6) and can move relative to the spindle (6) along the axial direction. A pressure head (18) is fixed at the top of the pull rod (15) and is located in the cavity. The outer surface of the pressure head (18) is an outer conical surface (181). Top blocks (19) are located outside the pressure head (18) in the cavity and are evenly arranged in multiples along the circumference. The structure of the top blocks (19) includes a limiting part (191) and a pushing part (192). The inner side of the limiting part (191) is an inner conical surface (1910) that cooperates with the outer conical surface (181). When the pull rod (15) moves axially relative to the spindle (6), the top blocks (19) can push the magnetic steel sheet adsorbed in the positioning groove (610) outward through the through hole (611) in the radial direction by cooperating with the outer conical surface (181). The fixing seat (7) is fixed above the mandrel (6) in the vertical direction and is used to fix the magnetic steel tube to be assembled; when the mandrel (6) moves in a straight line in the vertical direction, the adsorption part (61) can extend into the inside of the magnetic steel tube.

2. The external rotor magnet sheet assembly machine according to claim 1, characterized in that, The structure of the drive mechanism that drives the spindle (6) to move linearly in the vertical direction and drives the pull rod (15) to move axially relative to the spindle (6) is as follows: it includes a movable plate (8), which is fixedly connected to one end of the spindle (6), and a first cylinder (9) is fixedly mounted on the movable plate (8), the piston rod output end of which is connected to one end of the pull rod (15).

3. The external rotor magnet sheet assembly machine according to claim 2, characterized in that, Below the movable plate (8) is a fixed plate (10), on which a second cylinder (11) is provided. The piston rod output end of the cylinder is connected to the movable plate (8). The movable plate (8) and the fixed plate (10) are connected by a linear bearing (20) and a guide post (12) that cooperates with the linear bearing (20). The guide post (12) is fixed on the frame (5).

4. The external rotor magnet sheet assembly machine according to claim 1, characterized in that, The feeding assembly has the following structure: it includes a lower groove plate (4) and an upper groove plate (3) located above the lower groove plate (4). The upper groove plate (3) is provided with a plurality of upper groove holes (31), and the lower groove plate (4) is provided with a plurality of lower groove holes (41). The upper groove holes (31) and lower groove holes (41) are positioned vertically and vertically, respectively limiting the two ends of the magnetic steel sheet to be assembled in the length direction, thereby forming the feeding channel.

5. The external rotor magnet sheet assembly machine according to claim 4, characterized in that, The lower slot plate (4) is fixed to the top of the frame (5), and several equal height blocks (16) are provided between the upper slot plate (3) and the lower slot plate (4), and are connected by locking components.

6. The external rotor magnet sheet assembly machine according to claim 5, characterized in that, Holes are opened on the upper groove plate (3), lower groove plate (4) and frame (5) respectively, and the positions are corresponding to form a guide channel for the mandrel (6) to move. The gap between the inner wall of the guide channel and the outer wall of the guide part (62) of the mandrel (6) is no greater than the thickness of a magnetic steel sheet. The lower groove plate (4) is provided with a guide sleeve (14) that cooperates with the guide part (62); The top of the guide part (62) forms a limiting step surface (621), which serves as the bottom limiting surface of the positioning groove (610) of the adsorption part (61). The bottom of the cavity of the adsorption part (61) is provided with a limiting step surface (63) as a limiting surface for the movement of the pressure head (18).

7. The external rotor magnet sheet assembly machine according to claim 5, characterized in that, The fixing seat (7) is fixedly connected to the upper groove plate (3). The center of the fixing seat (7) has a relief hole for the spindle (6) to pass through. A positioning step surface (701) is formed on the inner wall of the relief hole for positioning the magnetic steel tube.

8. The external rotor magnet sheet assembly machine according to claim 1, characterized in that, The through hole (611) is an elongated hole, and the outline of the push part (192) of the top block (19) matches the elongated hole. The outer side of the push part (192) is an arc surface that matches the inner side of the magnet sheet. The size of the limiting part (191) is larger than the size of the elongated hole.

9. The external rotor magnet sheet assembly machine according to claim 1, characterized in that, It also includes a pressing mechanism, which includes a pressing block (2), the upper end of which is connected to the piston rod output end of the fixed third cylinder (1), and the lower end face is used to cooperate with the magnetic steel sheet to be assembled and press it into the fixed seat (7).

10. A method for assembling external rotor magnet plates, characterized in that, Assembly using the external rotor magnet sheet assembly machine as described in any one of claims 1-9 includes: Multiple feeding channels are used to stack closely arranged magnetic steel sheets, which are stacked along the thickness direction. The output end of each feeding channel is respectively connected to the positioning groove (610) of the adsorption part (61) of the mandrel (6). All positioning slots (610) automatically and synchronously adsorb a magnetic steel sheet located at the outermost end of the output end of each feeding channel. The magnetic steel tube to be assembled is fixed in the fixing base (7); The drive spindle (6) moves vertically, causing the adsorption part (61) to extend into the interior of the magnetic steel tube; The pull rod (15) inside the drive spindle (6) moves downward relative to the spindle (6) along the axial direction. It cooperates with the outer conical surface (181) of the pressure head (18) through the inner conical surface (1910) of the top block (19). The top block (19) moves outward along the radial direction and extends out of the through hole (611) of the positioning groove (610). It pushes the magnetic steel sheet adsorbed in the positioning groove (610) outward, so that the magnetic steel sheet is adsorbed on the inner wall of the magnetic steel tube, thus completing the synchronous assembly of a set of magnetic steel sheets in a magnetic steel tube. The pull rod (15) inside the drive spindle (6) moves upward relative to the spindle (6) axially; The drive spindle (6) moves downward in the vertical direction, causing the positioning groove (610) of the adsorption part (61) to return to the position where it docks with the output end of each feeding channel. All positioning grooves (610) automatically and synchronously adsorb the outermost magnetic steel sheet located at the output end of each feeding channel. When the magnetic steel sheet is adsorbed into the positioning groove (610), the top block (19) moves radially inward under the thrust of the magnetic steel sheet and returns from the through hole (611) to the cavity of the adsorption part (61), so that the inner conical surface (1910) and the outer conical surface (181) fit together again.

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