Rotor welding auxiliary device of micro motor for robot and using method

Abstract

The invention relates to the technical field of welding assistance, in particular to a rotor welding assisting device of a micro motor for a robot and a using method, the rotor welding assisting device comprises a fixing base used for placing a rotor, and sliding rails are arranged at the two ends of the fixing base. According to the rotor welding auxiliary device of the micro motor for the robot and the using method, through the linkage design of the temperature sensing metal sheet and the welding pen, a hot air channel is formed through supporting of the temperature sensing metal sheet in the preheating stage, and accurate preheating of a welding area is achieved. When the welding pen works and the temperature rises, the temperature sensing metal sheet is heated to deform and relieve support, the welding pen automatically blocks the through hole, hot air is exhausted from the air leakage hole, and disturbance of airflow to a high-temperature welding point is avoided. According to the airflow self-adaptive switching based on temperature sensing, intelligent airflow regulation and control in the preheating-welding stage can be achieved without an additional control module, interference of external airflow on precise welding of the micro motor rotor is reduced, and the forming quality and stability of welding points are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding auxiliary, in particular to a rotor welding auxiliary device for micro motor of robot and using method. BACKGROUND

[0002] As the core driving component in the field of modern precision manufacturing, micro motor is widely used in high-end equipment such as medical devices, aerospace, consumer electronics and robots. The machining precision of the rotor directly determines the running efficiency, noise level and service life of the motor. Among them, the welding process of the rotor winding and the commutator is a key link, which requires the welding point to have extremely high size precision and mechanical strength to adapt to the working condition requirements of high-speed operation of micro motor.

[0003] In the welding production line, the function of the rotor welding auxiliary device is to provide a stable working environment, accurate preheating conditions and reliable quality assurance for the welding pen. The traditional auxiliary device mainly consists of the following parts: a positioning clamp for fixing the rotor, an independent air system for providing hot air preheating, a servo mechanism for driving the welding pen to move, and a sensor assembly for monitoring the welding process. The working process is usually as follows: the rotor is placed on the positioning clamp by manual or mechanical arm - the hot air gun preheats the welding area - the welding pen is driven by the servo motor to approach and complete the welding - the sensor detects the appearance of the welding point.

[0004] In the prior art, the rotor welding auxiliary device has the following problems: The preheating air flow is easily disturbed by the welding point, affecting the forming quality; the welding pen is prone to slight deformation (such as bending) after long-term use, lacks real-time detection mechanism, and is prone to defects such as false welding and offset welding; the hot melt welding liquid of the welding pen tip is unevenly distributed during the welding process, which is prone to dripping phenomenon, resulting in rotor short circuit or insulation layer damage, especially for the precision structure of micro motor.

[0005] In view of this, we propose a rotor welding auxiliary device for micro motor of robot and using method. SUMMARY

[0006] The purpose of the present application is to provide a rotor welding auxiliary device for micro motor of robot and using method to solve the problems of air flow disturbance welding, welding pen deformation detection and welding liquid dripping. In order to achieve the above purpose, the present application provides the following technical scheme: a rotor welding auxiliary device for micro motor of robot, comprising a fixing seat for placing the rotor, and the both ends of the fixing seat are provided with sliding rails, a ring seat is slidingly arranged on the sliding rails, a plurality of through holes are annularly distributed in the inner ring of the ring seat, a welding pen is movably arranged in the through hole, a gas pump is fixedly arranged on the side surface of the ring seat and supplies hot air to the through hole, a gas disc is rotatably arranged on the surface of the welding pen and is displaced by the air flow, and a first reset spring is arranged in the through hole to reset the gas disc. The through hole is internally fixed with a sealing ring, and the tip of the soldering pen is provided with a plurality of temperature sensing metal sheets supporting a gap along the sealing ring, and hot air is blown to the welding area through the gap; The through hole is internally provided with a gas vent communicating with the outside.

[0007] Preferably, two rows of toothed rotating shafts are symmetrically arranged in the through hole, and two racks for driving the rotating shafts to rotate are fixedly arranged on the air disc, the shaft hole where the rotating shafts are located and the slot where the racks are located are communicated, and are both arranged in the through hole, and the rotating shafts are fixedly provided with elastic sheets, and when the first section of the air disc and the rack moves downward, the rotating shafts drive the elastic sheets to deflect and deform into a spiral structure along the through hole.

[0008] Preferably, the outer surface of the soldering pen is slidingly provided with a convex rib, and the top of the convex rib is provided with an upper inclined surface, and the airflow pushes the convex rib and the soldering pen to rotate along the upper inclined surface, and the convex rib rotates and moves downward along the spiral structure. The convex rib is reset between the elastic sheets in the adjacent two spiral states, and the soldering pen is provided with a second reset spring for pushing the convex rib to reset.

[0009] Preferably, when the temperature sensing metal sheet shrinks under heat, the soldering pen and the second section of the rack move downward, driving the elastic sheet to deflect and deform into a ring structure along the through hole, one side of the ring structure is provided with a gap through which the airflow passes, and the adjacent two gaps are oppositely distributed.

[0010] Preferably, the side of the air disc facing the air inlet direction of the air pump is provided with an arc-shaped flow guide surface, and the airflow impacts the air disc along the flow guide surface to push it to axially displace.

[0011] Preferably, the connecting end of the elastic sheet and the rotating shaft is provided with an arc-shaped transition part, and the elastic sheet elastically deforms through the transition part when it rotates with the rotating shaft.

[0012] Preferably, the temperature sensing metal sheets are distributed at equal intervals along the circumference of the soldering pen, and gaps are left between the adjacent temperature sensing metal sheets for airflow to pass through.

[0013] A method for using a rotor welding auxiliary device of a miniature motor for a robot, comprising the following steps: S1, placing and fixing the miniature motor rotor to be welded on the fixed seat; S2, starting the air pump to make hot air be delivered along the through hole and push the soldering pen to displace along the air disc, and blow to the welding area of the rotor through the gap between the temperature sensing metal sheet and the sealing ring to preheat the welding area, at this time the soldering pen does not contact the welding area, and only maintains the gap with the sealing ring through the support of the temperature sensing metal sheet, to ensure that the hot air continuously acts on the welding point. S3, after preheating is completed, the welding pen is started, the pen head of the welding pen contacts the welding area of the rotor and carries out the welding work, with the working temperature of the welding pen increasing, the temperature sensing metal sheet is deformed by heat, the supporting effect of the welding pen is released, the welding pen is driven by the air pressure and moves downward, gradually blocks the through hole, at this time, the hot air cannot continue to pass through the through hole into the welding area, but is discharged from the air vent in the through hole, avoiding the disturbance of the airflow to the high-temperature welding point; S4, during the continuous air supply process of the air pump, the airflow drives the air disc and the welding pen to move downward for the first time, at this time, the rack moves downward synchronously and drives the elastic sheet to deflect to form a spiral structure, the airflow pushes the convex rib and the welding pen to rotate along the upper inclined surface of the convex rib, if the welding pen is deformed, it will be stuck in the through hole, at the same time, the convex rib moves downward along the spiral structure and is reset to pop up, driving the welding pen to vibrate axially to assist the falling of the welding slag; S5, when the temperature sensing metal sheet is completely deformed, the welding pen moves downward for the second time, the rack drives the elastic sheet to further deflect to form an annular structure, the airflow flows along the annular gap of the annular structure and drives the convex rib to stably rotate, so that the hot melt welding liquid is uniformly attached to the pen head, reducing the dropping of the welding liquid.

[0014] Compared with the prior art, the beneficial effects of the present application are: In the present application, through the linkage design of the temperature sensing metal sheet and the welding pen, the temperature sensing metal sheet is used to support the hot air passage in the preheating stage to realize accurate preheating of the welding area. When the welding pen works and the temperature rises, the temperature sensing metal sheet is deformed by heat to release the support, the welding pen automatically blocks the through hole, and the hot air is discharged from the air vent, avoiding the disturbance of the airflow to the high-temperature welding point. This airflow self-adaptive switching based on temperature sensing can realize intelligent airflow control in the "preheating-welding" stage without additional control modules, reducing the interference of external airflow on the precision welding of the rotor of the micro motor, and significantly improving the forming quality and stability of the welding point.

[0015] In the present application, through the synergistic effect of the air disc, the rack, the elastic sheet and the convex rib, in the first downward movement process of the welding pen, the airflow is used to drive the convex rib to rotate along the spiral structure, if the welding pen is deformed (such as bending), it will be stuck in the through hole, realizing self-detection of the welding pen state, avoiding welding defects caused by abnormal welding pen. At the same time, the axial vibration generated by the reset and pop-up of the convex rib after moving downward along the spiral structure can assist in removing the welding slag attached to the surface of the welding pen, reducing the influence of the welding slag on the welding precision. The above functions are integrated in the same mechanical structure, without additional detection or cleaning components, reducing the complexity of the equipment, improving the reliability and maintenance convenience during long-term use.

[0016] In the application, when the second section of the welding pen moves down in the welding stage, the elastic sheet deforms into a ring structure with a facing notch, and the airflow pushes the welding pen to rotate stably along the notch, so that the hot melt welding liquid is uniformly attached to the pen head. At the same time, the welding liquid is affected by the centrifugal force and surface tension during rotation, reducing the dripping phenomenon caused by uneven distribution. For precision components such as micro motor rotors, this design effectively avoids short circuit, false welding and other problems caused by welding liquid dripping, ensures the consistency of each welding point in the batch welding process, and improves the product qualification rate. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of the application; Figure 2 is an exploded view of the welding pen and the through hole of the application; Figure 3 is an enlarged view of A in the application; Figure 2 Figure 4 is a schematic diagram of the structure of the welding pen, air disc and rack of the application; Figure 5 is a sectional view of the through hole of the application Figure 1 ; Figure 6 is an enlarged view of B in the application; Figure 5 Figure 7 is an enlarged view of C in the application; Figure 5 Figure 8 is a sectional view of the through hole of the application Figure 2 ; Figure 9 is an enlarged view of D in the application 8; Figure 10 is an exploded view of the rack, shaft, elastic sheet and protrusion of the application; Figure 11 is an exploded view of the elastic sheet and protrusion of the ring structure of the application; Figure 12 is an enlarged view of E in the application 11.

[0018] In the figure: 1, fixed seat; 2, sliding rail; 3, ring seat; 4, through hole; 5, welding pen; 6, air pump; 7, air disc; 8, first reset spring; 9, sealing ring; 10, temperature sensitive metal sheet; 11, air vent; 12, shaft hole; 13, rotating shaft; 14, rack; 15, insertion slot; 16, elastic sheet; 17, sliding groove; 18, protrusion; 19, upper inclined surface; 20, second reset spring; 21, notch. DETAILED DESCRIPTION

[0019] ​​​Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] Please refer to Figures 1 to 12 The present application provides a technical solution: a rotor welding auxiliary device for a miniature motor for a robot, comprising a fixing seat 1 for placing the rotor, the fixing seat 1 is made of high-strength cast iron material, the top surface is processed with a V-shaped positioning groove matched with the outer circle of the rotor of the miniature motor, the groove depth is 5 mm, a high-temperature-resistant silicone rubber pad with a thickness of 1 mm is pasted in the groove, which can not only avoid scratching the surface of the rotor, but also can preliminarily fix the rotor through friction.

[0021] Both ends of the fixing seat 1 are provided with sliding rails 2, the sliding rails 2 are dovetail groove structures, the groove width is 15 mm, the depth is 8 mm, and the dovetail blocks at the bottom of the ring seat 3 are in sliding cooperation, the cooperation gap is controlled to be 0.05-0.1 mm, so that the ring seat 3 can slide stably and there is no radial shaking, and the end of the sliding rail 2 is provided with a limiting block to prevent the ring seat 3 from slipping off.

[0022] The ring seat 3 is slidably arranged on the sliding rail 2, the ring seat 3 is a 45 steel forged part with an inner diameter matched with the rotor welding area, the bottom of the ring seat 3 is provided with a dovetail block matched with the sliding rail 2, the dovetail block is provided with a locking knob, and the position of the ring seat 3 can be fixed after the locking knob is tightened.

[0023] There are 12 through holes 4 distributed in the inner circle of the ring seat 3, the welding pen 5 can be aligned with the rotor welding point from multiple angles, the inner wall of the through hole 4 is chrome-plated with a thickness of 0.01 mm to reduce friction, and a ring-shaped step with a height of 2 mm is processed at the position corresponding to the air disc 7, which is used to limit the maximum reset stroke of the air disc 7.

[0024] The welding pen 5 is movably arranged in the through hole 4, and the end of the pen head is ground to a 30° taper angle, which is convenient for precise contact with the welding point.

[0025] The side surface of the ring seat 3 is fixedly provided with an air pump 6 for conveying hot air into the through hole 4, the air pump 6 is a miniature scroll air pump 6 with a power of 50 W, the air outlet is connected to the annular gas collection chamber outside the ring seat 3 through a PU material hose, the gas collection chamber is in communication with each through hole 4 through 6 branch air channels, which ensures that the airflow of each through hole 4 is uniform, and independent air pumps 6 can also be installed for each through hole 4.

[0026] The surface of the welding pen 5 is rotatably provided with an air disc 7 which is displaced by the airflow, the air disc 7 is a circular sheet structure with a thickness of 3 mm, one side of the air disc 7 facing the air inlet direction of the air pump 6 is provided with an arc-shaped flow guide surface, and the airflow impacts the air disc 7 along the flow guide surface to push it to axially displace.

[0027] The first reset spring 8 is arranged in the through hole 4 to reset the push air disc 7, and is a cylindrical helical spring.

[0028] The sealing ring 9 is fixedly arranged in the through hole 4, is made of brass, has a thickness of 5 mm, and is fixed at a position close to the hole opening of the through hole 4 through interference fit.

[0029] The tip of the solder pen 5 is provided with four temperature-sensing metal sheets 10 which support a gap along the sealing ring 9, are made of copper-based memory alloy, are distributed at equal intervals along the circumferential direction of the solder pen 5, have an adjacent included angle of 90°, and have a gap between adjacent temperature-sensing metal sheets 10 for airflow to pass through. The root of the temperature-sensing metal sheet 10 is welded and fixed to the solder pen 5, the free end is inclined outward and abuts against the inner wall of the sealing ring 9, and an annular gap of 0.8 mm is formed in the initial state, and hot air is blown to the welding area through the gap.

[0030] The through hole 4 is provided with a gas vent hole 11 which is in communication with the outside, has a hole diameter of 3 mm, and has an axis which forms an angle of 45° with the axis of the through hole 4, so that hot air can be quickly discharged.

[0031] In this embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 , two rows of toothed rotating shafts 13 are symmetrically arranged in the through hole 4, and the rotating shafts 13 are installed in the shaft holes 12 in the inner wall of the through hole 4 through copper bearings.

[0032] The air disc 7 is fixedly provided with two racks 14 which push the rotating shafts 13 to rotate, and the racks 14 are fixed to the air disc 7 through countersunk head screws.

[0033] The shaft holes 12 in which the rotating shafts 13 are arranged and the insertion grooves 15 in which the racks 14 are arranged are in communication, are both arranged in the through hole 4, and the insertion grooves 15 have a gap fit with the thickness of the racks 14.

[0034] The rotating shafts 13 are fixedly provided with elastic sheets 16 made of 65Mn spring steel and having a thickness of 0.3 mm, and the connecting end of the elastic sheet 16 to the rotating shaft 13 is provided with an arc-shaped transition portion, and the elastic sheet 16 elastically deforms through the transition portion when the rotating shaft 13 rotates.

[0035] When the first section of the air disc 7 and the rack 14 moves downward, the rotating shaft 13 drives the elastic sheet 16 to deflect and deform into a spiral structure along the through hole 4.

[0036] In this embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12As shown, the outer surface of the solder pen 5 is slidingly provided with a convex rib 18, and the solder pen 5 is provided with a sliding groove 17 corresponding to the convex rib 18. The two ends of the sliding groove 17 limit the maximum displacement range of the convex rib 18.

[0037] The top of the convex rib 18 is provided with an upper inclined surface 19 with an inclination angle of 30°. The airflow pushes the convex rib 18 and the solder pen 5 to rotate along the upper inclined surface 19.

[0038] The outer side wall of the convex rib 18 is threadedly matched with the spring sheet 16 of the spiral structure. When the convex rib 18 rotates with the solder pen 5, it moves downward along the spiral structure.

[0039] The spring sheet 16 of the adjacent two spiral states forms a reset channel for the convex rib 18 to pass through. The solder pen 5 is provided with a second reset spring 20 for pushing the convex rib 18 to reset. The second reset spring 20 is located in the sliding groove 17.

[0040] In this embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 When the temperature-sensitive metal sheet 10 shrinks due to heat, the solder pen 5 and the second segment of the rack 14 move downward, driving the spring sheet 16 to deflect and deform into a ring-shaped structure along the through hole 4.

[0041] One side of the ring-shaped structure is provided with a gap 21 through which the airflow passes. Adjacent two gaps 21 are oppositely distributed.

[0042] In this embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 The side of the air disc 7 facing the air inlet direction of the air pump 6 is provided with an arc-shaped flow guide surface. The airflow impacts the air disc 7 along the flow guide surface to push it to move axially. The arc-shaped flow guide surface can guide the airflow delivered by the air pump 6 along a smooth curved surface to the force receiving surface of the air disc 7, reducing the turbulent loss when the airflow impacts, and making the airflow pressure more concentrated to be converted into driving force for pushing the air disc 7 to move axially. This design can improve the energy transmission efficiency of the air disc 7 and the airflow, ensure that the "downward movement-reset" action of the air disc 7 under the action of the first reset spring 8 is more sensitive, and further ensure the response speed and stability of the first segment of the solder pen 5 to move downward.

[0043] In this embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12As shown, the connecting end of the elastic sheet 16 and the rotating shaft 13 is provided with an arc-shaped transition part, and the elastic sheet 16 elastically deforms through the transition part when rotating with the rotating shaft 13. The arc-shaped transition part can disperse the stress concentration of the elastic sheet 16 when rotating with the rotating shaft 13, and avoid fatigue fracture of the elastic sheet 16 caused by rigid connection in the process of repeatedly deflecting from the natural state to the spiral structure and then to the annular structure. At the same time, the elastic deformation characteristics of the arc-shaped structure can make the deflection action of the elastic sheet 16 more smooth, reduce the friction jamming of the elastic sheet 16 and the inner wall of the through hole 4, ensure the forming precision of the spiral structure and the annular structure, and indirectly improve the reliability of the rotation and vibration of the solder pen 5.

[0044] In the embodiment, as shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 12 Figure 1 Figure 2 Figure 3 Figure 4 Figures 5 to 12 As shown, the temperature-sensitive metal sheet 10 is distributed at equal intervals along the circumferential direction of the solder pen 5, and a gap for airflow circulation is left between adjacent temperature-sensitive metal sheets 10. The equally spaced temperature-sensitive metal sheets 10 can uniformly support the solder pen 5, avoid radial deviation of the solder pen 5 caused by uneven unilateral force, and ensure the symmetry of the gap between the solder pen 5 and the sealing ring 9. The airflow gap between adjacent metal sheets can assist the hot air to pass through the gap more uniformly to the welding area, reduce the local airflow dead angle, improve the temperature uniformity in the preheating stage, and lay a foundation for the subsequent welding quality. At the same time, this distribution method can also make the deformation force of the temperature-sensitive metal sheet 10 more balanced when it shrinks under heat, and ensure the coaxiality of the second section of the solder pen 5 when it moves downward.

[0045] A method for using a rotor welding auxiliary device of a miniature motor for a robot, comprising the following steps: S1, placing the miniature motor rotor to be welded on the fixed seat 1 for fixation.

[0046] S2, starting the air pump 6 to make the hot air be delivered along the through hole 4 and push the solder pen 5 to displace along the air disc 7, and blow to the welding area of the rotor through the gap between the temperature-sensitive metal sheet 10 and the sealing ring 9 to preheat the welding area. At this time, the solder pen 5 does not contact the welding area, but only keeps the gap with the sealing ring 9 through the support of the temperature-sensitive metal sheet 10, to ensure that the hot air continuously acts on the welding point.

[0047] S3, after the preheating is completed, the solder pen 5 is started to make the pen head of the solder pen 5 contact the welding area of the rotor and perform welding work. As the working temperature of the solder pen 5 rises, the temperature-sensitive metal sheet 10 deforms under heat, and the supporting effect on the solder pen 5 is released. The solder pen 5 moves downward under the driving of the air pressure, and gradually blocks the through hole 4. At this time, the hot air cannot continue to enter the welding area through the through hole 4, but is discharged from the air vent hole 11 in the through hole 4, to avoid disturbance of the airflow to the high-temperature welding point.

[0048] S4, during the process of air pump 6 continuously supplying air, the air flow pushes air disc 7 and solder pen 5 to move down in the first section, at this time, rack 14 moves down synchronously and pushes elastic sheet 16 to deflect to form a spiral structure, the air flow pushes convex rib 18 and solder pen 5 to rotate along the upper inclined surface 19 of convex rib 18, if solder pen 5 exists deformation, it will be stuck in through hole 4, at the same time, convex rib 18 moves down along the spiral structure and then pops up under the action of second reset spring 20, drives solder pen 5 to vibrate axially to assist the falling of welding slag.

[0049] S5, when temperature sensing metal sheet 10 completely deforms, solder pen 5 moves down in the second section, rack 14 drives elastic sheet 16 to further deflect to form a ring structure, the air flow flows along the gap 21 of the ring structure and pushes convex rib 18 to drive solder pen 5 to rotate stably, so that hot melt solder is evenly attached to the pen head, reducing the dropping of solder.

[0050] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by the technical workers in the industry that the present application is not limited by the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application, various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A rotor welding auxiliary device for a micro motor for a robot, characterized in that: It comprises a fixed seat (1) for supporting a rotor, wherein two ends of the fixed seat (1) are symmetrically fixed with slide rails (2), a ring seat (3) is slidably mounted on the slide rail (2), the inner ring of the ring seat (3) has a plurality of through holes (4) distributed along the circumference, and a soldering pen (5) is movably inserted into each of the through holes (4); An air pump (6) is fixedly mounted on the outer peripheral wall of the ring seat (3), and the output end of the air pump (6) is connected to the through hole (4) to transport hot air into the interior thereof; An air disc (7) is rotatably provided on the outer peripheral wall of the soldering pen (5), and the air disc (7) is axially displaced along the through hole (4) by the thrust of the air flow. A first return spring (8) is provided in the through hole (4), and the two ends of the first return spring (8) respectively abut against the air disc (7) and the inner wall of the through hole (4) to drive the air disc (7) to return to its original position. A sealing ring (9) is fixedly provided in the through hole (4), and a plurality of temperature-sensitive metal sheets (10) are provided around the outer peripheral wall of the pen tip of the soldering pen (5). The free ends of the temperature-sensitive metal sheets (10) abut against the inner wall of the sealing ring (9) to form a gap between the soldering pen (5) and the sealing ring (9) for hot air to flow. The hot air is guided to the welding area through the gap. An air leakage hole (11) is provided on the side wall of the through hole (4), and the air leakage hole (11) connects the inside of the through hole (4) with the external environment.

2. The rotor welding auxiliary device for a micro motor for a robot according to claim 1, characterized in that: The inner wall of the through hole (4) is symmetrically provided with two rows of shaft holes (12), each of the shaft holes (12) is rotatably provided with a rotating shaft (13) with teeth, the outer peripheral wall of the gas disc (7) is fixed with two racks (14), the inner wall of the through hole (4) is provided with a slot (15) adapted to the rack (14), the shaft hole (12) is connected to the slot (15), and the tooth surface of the rack (14) is meshed with the outer peripheral wall of the rotating shaft (13); The outer peripheral wall of the rotating shaft (13) is fixedly provided with a spring piece (16). When the air disc (7) drives the rack (14) to move downward along the slot (15) for the first section, the rotating shaft (13) is driven by the rack (14) to rotate and drive the spring piece (16) to deflect radially along the through hole (4) to form a spiral structure.

3. The rotor welding auxiliary device for a micro motor for a robot according to claim 2, characterized in that: The outer peripheral wall of the soldering pen (5) is provided with a chute (17) along the axial direction, a ridge (18) is slidably mounted in the chute (17), and an upper inclined surface (19) is provided at the top of the ridge (18). When the airflow flows along the upper inclined surface (19), a radial thrust is generated to drive the ridge (18) to drive the soldering pen (5) to rotate; The outer side wall of the ridge (18) forms a spiral guide with the spring piece (16) of the spiral structure, and the ridge (18) moves downward along the axial direction of the spiral structure as the soldering pen (5) rotates; A reset channel for the ridge (18) to pass through is formed between two adjacent spiral springs (16), and a second reset spring (20) is provided on the soldering pen (5) for pushing the ridge (18) to reset. The second reset spring (20) is located in the slide groove (17) to drive the ridge (18) to move upward and reset along the reset channel.

4. The rotor welding auxiliary device for a micro motor for a robot according to claim 3, characterized in that: When the temperature-sensitive metal sheet (10) contracts due to heat, it releases its contact with the sealing ring (9), and the soldering pen (5) drives the rack (14) to move downward along the slot (15) for the second section under the thrust of the airflow, and the rotating shaft (13) is further rotated by the rack (14) and drives the spring (16) to deflect to form a ring structure; A notch (21) is provided at a connection point on one side of the annular structure, and the notches (21) of two adjacent annular structures are distributed in opposite directions along the through hole (4).

5. The rotor welding auxiliary device for a micro motor for a robot according to claim 4, characterized in that: The air disc (7) is provided with an arc-shaped guide surface on one side facing the air inlet direction of the air pump (6), and the air flow impacts the air disc (7) along the guide surface to promote its axial displacement.

6. The rotor welding auxiliary device for a micro motor for a robot according to claim 5, characterized in that: The connecting end of the spring piece (16) and the rotating shaft (13) is provided with an arc-shaped transition portion, and the spring piece (16) elastically deforms through the transition portion when rotating with the rotating shaft (13).

7. The rotor welding auxiliary device for a micro motor for a robot according to claim 6, characterized in that: The temperature-sensitive metal sheets (10) are distributed at equal intervals along the circumference of the soldering pen (5), and gaps for airflow are left between adjacent temperature-sensitive metal sheets (10).

8. A method for using a rotor welding auxiliary device for a micro motor for a robot, using the rotor welding auxiliary device for a micro motor for a robot as claimed in claim 7, characterized in that: The steps include: S1. Fix the rotor: Place the rotor to be welded on the fixing seat (1) and fix it; S2, preheating treatment: start the air pump (6), and the hot air preheats the welding area through the gap between the temperature-sensitive metal sheet (10) and the sealing ring (9), and the welding pen (5) does not touch the workpiece temporarily; S3, start welding: the soldering pen (5) starts to contact the welding area, the heated temperature-sensitive metal sheet (10) is deformed, the soldering pen (5) moves down to block the through hole (4), and the hot air is discharged from the vent hole (11); S4, the first action: the airflow pushes the soldering pen (5) downward, the rack (14) makes the spring (16) form a spiral structure, driving the soldering pen (5) to rotate and self-check, while the ridge (18) moves up and down to make the soldering pen (5) vibrate and clean the slag; S5, the second action: after the temperature-sensitive metal sheet (10) is completely deformed, the soldering pen (5) is further moved downward to make the spring (16) into a ring structure, and the airflow pushes the soldering pen (5) to rotate stably to ensure that the soldering liquid is evenly attached.

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