Automatic spot welding equipment for coreless motor rotors

Abstract

The present invention discloses an automatic spot welding device for a hollow cup motor rotor. The multi-station automatic assembly device includes an intermediate fixed disk, a first rotating disk assembly, a first feeding mechanism, a first alignment mechanism, a second alignment mechanism, a spot welding mechanism, a resistance testing mechanism, a dispensing mechanism, a polishing mechanism, and a blanking mechanism. The first rotating disk assembly is rotatably arranged on the outer periphery of the intermediate fixed disk. A plurality of first positioning fixtures are circumferentially arranged on the first rotating disk assembly. The winding coil finishing device includes a second rotating disk assembly, a second feeding mechanism, a third alignment mechanism, a pin shaping mechanism, a cutting mechanism, and a transfer mechanism. A plurality of second positioning fixtures are circumferentially arranged on the second rotating disk assembly. Through the above-mentioned arrangement, fully automated production and processing of hollow cup rotors can be realized, which greatly improves production efficiency and saves labor costs.

Description

Technical Field

[0001] The invention relates to the technical field of coreless motor processing, in particular to an automatic spot welding device for a coreless motor rotor. Background Art

[0002] Hollow cup motors are widely used in military, aerospace, civil appliances, industrial products and other fields due to their outstanding features such as high energy conversion efficiency, rapid starting and braking, stable and reliable operation, and small speed fluctuation.

[0003] The conventional structure of a coreless motor rotor includes a commutator assembly and a winding coil. The commutator assembly includes a motor shaft, a rotor frame fixedly arranged on the outer periphery of the motor shaft, and a commutator installed on the outer periphery of the rotor frame. There are multiple groups of commutator segments distributed circumferentially on the upper end surface of the commutator, and multiple groups of pins are provided on the winding coil. The pins of the winding coil are welded and fixed to the commutator segments on the commutator one by one.

[0004] In the prior art, manual work is usually used when welding hollow cup rotors. The assembled commutator assembly is placed on the operating table, and then the pins on the winding coil and the commutator segments of the commutator are manually welded together. The above operations are completed manually. Workers often manually rotate the hollow cup motor rotor to better align the welded parts with themselves for easy operation, or workers have to hold the welding gun and rotate around the hollow cup motor rotor to weld the pins and commutator segments. The manual operation efficiency is low, which also restricts the production efficiency of the hollow cup motor rotor. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic spot welding device for hollow cup motor rotors, which can not only realize automatic loading, alignment, shaping, cutting and transportation of winding coils, but also can automatically correct the position of commutator components and winding coils, spot weld fixation, resistance testing, glue dispensing packaging, polishing and automatic unloading, thereby realizing fully automated production, greatly improving production efficiency and saving labor costs.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: a hollow cup motor rotor automatic spot welding device, comprising

[0007] A multi-station automatic assembly device includes an intermediate fixed disk, a first rotating disk assembly, a first feeding mechanism, a first alignment mechanism, a second alignment mechanism, a spot welding mechanism, a resistance testing mechanism, a glue dispensing mechanism, a polishing mechanism, and a blanking mechanism. The first rotating disk assembly is rotatably arranged on the outer periphery of the intermediate fixed disk. Multiple groups of first positioning fixtures are circumferentially arranged on the first rotating disk assembly. The first feeding mechanism is used to automatically feed the commutator assembly to the first positioning fixture. The first alignment mechanism is used to align the position of the commutator assembly. The second alignment mechanism drives the winding coil to rotate relative to the commutator assembly so that the pins correspond to the commutator segments. The spot welding mechanism is used to weld the pins to the corresponding commutator segments one by one. The resistance testing mechanism is used to test the resistance value of adjacent welding points. The glue dispensing mechanism is used to encapsulate the end faces of the commutator assembly and the winding coil welding ends. The polishing mechanism is used to polish the outer peripheral surface of the motor shaft of the commutator assembly. The blanking mechanism is used to take out the hollow cup motor rotor that has been processed.

[0008] The winding coil finishing device includes a second rotating disk assembly, a second loading mechanism, a third alignment mechanism, a pin shaping mechanism, a cutting mechanism and a transfer mechanism. The second rotating disk assembly is circumferentially provided with multiple sets of second positioning fixtures. The second loading mechanism is used to load the winding coil onto the second positioning fixture. The third alignment mechanism is used to align the position of the pin. The pin shaping mechanism includes a pin adjustment assembly for adjusting the pins of the winding coil to an equal angle setting and a pin pressing assembly for pressing down the pins of the winding coil. The cutting mechanism is used to cut the pins to a set length. The transfer mechanism is used to transfer the winding coil on the second rotating disk assembly to the first rotating disk assembly.

[0009] Furthermore, the first positioning fixture includes a first fixed seat, a first positioning assembly arranged on the first fixed seat, a first bearing seat rotatably mounted on the first fixed seat, and a first clamping assembly arranged on the first bearing seat. The lower part of the first bearing seat has a rotation driving part, and the first bearing seat is provided with a first positioning column. The first positioning column is provided with a first central channel through which the power supply shaft passes. The first positioning column has a support portion adapted to the inner diameter of the winding coil. The first positioning assembly can move between a locking position and an unlocking position. The first bearing seat is locked to the first fixed seat through the first positioning assembly. The first clamping assembly can move between a clamping position and an unlocking position. The winding coil and the commutator assembly are clamped and fixed by the first clamping assembly.

[0010] Furthermore, the intermediate fixed plate is respectively provided with a first pushing member at the position corresponding to the transfer mechanism, the second alignment mechanism and the unloading mechanism, and the first pushing member is used to drive the first clamping assembly to switch from the clamping position to the releasing position.

[0011] Furthermore, an image recognition sensor is provided at the position of the intermediate fixed disk corresponding to the second alignment mechanism, which identifies whether the pins of the winding coil and the commutator segments of the commutator assembly are aligned through the image recognition sensor, thereby assisting the second alignment mechanism to adjust the pin position of the winding coil.

[0012] Furthermore, the positions of the intermediate fixed disk corresponding to the spot welding mechanism, the resistance testing mechanism, the gluing mechanism, and the polishing mechanism are respectively provided with second pushing members, and the second pushing members are used to drive the first positioning assembly to switch from the locked position to the unlocked position. The positions of the lower end of the first rotating disk assembly corresponding to the spot welding mechanism, the resistance testing mechanism, the gluing mechanism, and the polishing mechanism are respectively provided with rotation drive units, and the rotation drive unit includes a mounting seat, a driving motor fixedly installed on the mounting seat, and a lifting assembly for driving the mounting seat to rise and fall. The output end of the driving motor is provided with a joint part that cooperates with the rotation driving part, and the driving motor drives the first bearing seat to rotate through the joint part.

[0013] Furthermore, the resistance testing mechanism includes a first testing mechanism and a second testing mechanism, the first testing mechanism is arranged between the spot welding mechanism and the gluing mechanism, and the second testing mechanism is arranged between the polishing mechanism and the blanking mechanism. The multi-station automatic assembly device is also provided with a first waste removal mechanism, and the first waste removal mechanism is arranged at the next station of the first testing mechanism.

[0014] Furthermore, the glue dispensing mechanism includes a quick-drying glue dispensing mechanism and a UV glue dispensing mechanism, and a hot air drying mechanism and a UV lamp drying mechanism are arranged between the glue dispensing mechanism and the polishing mechanism, wherein the hot air drying mechanism is arranged between the quick-drying glue dispensing mechanism and the UV glue dispensing mechanism, and the UV lamp drying mechanism is arranged at the next workstation of the UV glue dispensing mechanism.

[0015] Furthermore, the second positioning fixture includes a second fixed seat, a second positioning column fixed to the upper end surface of the second fixed seat, and a second clamping assembly arranged on the second fixed seat. The second clamping assembly can move between a clamping position and a release position, and the winding coil is clamped and fixed to the second positioning column through the second clamping assembly.

[0016] Furthermore, the pin adjustment assembly includes a support plate, an adjustment block, a first cylinder and a lifting mechanism that drives the support plate to rise and fall vertically. The support plate is provided with a through hole corresponding to the second positioning column below. The adjustment block is provided with three groups and is distributed at equal angles on the periphery of the through hole. The side of the adjustment block adjacent to the through hole is provided with symmetrically arranged inclined portions. The angle between the two inclined portions of the same adjustment block is equal to or slightly less than 120°. The first cylinder is provided with three groups and corresponds one-to-one to the adjustment block. The first cylinder is used to drive the corresponding adjustment block to extend and retract along the center of the through hole.

[0017] Furthermore, the cutting mechanism includes a support block, a connecting tube fixedly arranged on the support block, a sleeve slidably arranged in the connecting tube, a spring for driving the sleeve to move upward, a needle body portion fixedly connected to the support block, and a downward pressing cylinder for driving the support block to be pressed downward. An avoidance channel that cooperates with the guide of the needle body portion is provided in the center of the sleeve, and the outer diameter of the needle body portion is adapted to the aperture of the second center channel of the second positioning column.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The automatic spot welding equipment for hollow cup motor rotors of the present invention can not only realize automatic loading of winding coils, pin position alignment, pin shaping, pin cutting and transportation, but also realize automatic assembly, position correction, spot welding fixation, resistance testing, glue dispensing packaging, polishing and automatic unloading of commutator components and winding coils, thereby realizing fully automated production and processing of hollow cup rotors, greatly improving production efficiency and saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the multi-station automatic assembly device of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the first feeding mechanism of the present invention.

[0023] Figure 4 It is a structural schematic diagram of the material shelf of the present invention.

[0024] Figure 5 The present invention Figure 4 Enlarged view of point A.

[0025] Figure 6 It is a structural schematic diagram of the positioning pressure plate of the present invention.

[0026] Figure 7 It is a structural schematic diagram of the first positioning fixture of the present invention.

[0027] Figure 8 It is a top view of the first positioning fixture of the present invention.

[0028] Figure 9 The present invention Figure 8 Enlarged view of point B.

[0029] Figure 10 It is a structural schematic diagram of the rotary drive unit of the present invention.

[0030] Figure 11It is a structural schematic diagram of the second alignment mechanism of the present invention.

[0031] Figure 12 It is a structural schematic diagram of the winding coil finishing device of the present invention.

[0032] Figure 13 It is a top view of the winding coil finishing device of the present invention.

[0033] Figure 14 It is a structural schematic diagram of the second positioning fixture of the present invention.

[0034] Figure 15 It is a structural schematic diagram of the third alignment mechanism of the present invention.

[0035] Figure 16 It is a top view of the third alignment mechanism of the present invention.

[0036] Figure 17 It is a structural schematic diagram of the pin shaping mechanism of the present invention.

[0037] Figure 18 It is a top view of the pin shaping mechanism of the present invention.

[0038] Figure 19 It is a schematic diagram of the inclined portion of the present invention.

[0039] Figure 20 It is a structural schematic diagram of the cutting mechanism of the present invention.

[0040] Figure 21 It is a structural schematic diagram of the coil pressing mechanism of the present invention.

[0041] In the figure: 10, multi-station automatic assembly device; 11, first feeding mechanism; 111, vibration plate; 112, shelf; 1121, material taking chamber; 1122, feeding channel; 113, material taking mechanism; 1131, first clamping jaw assembly; 1132, first transfer assembly A; 1133, first transfer assembly B; 114, third positioning assembly; 1141, positioning pressure plate; 1142, third elastic member; 1143, positioning groove; 1144, limit plate; 1145, flange; 115, unlocking block; 12, first alignment mechanism; 13, second alignment mechanism; 131, image recognition sensor; 132, first push member; 133, first mounting plate; 134, first push cylinder; 135, first adjusting wheel; 1 36. First tensioning wheel; 137. First driving wheel; 138. First motor; 14. Spot welding mechanism; 15. Resistance testing mechanism; 151. First testing mechanism; 152. Second testing mechanism; 153. First waste removal mechanism; 16. Glue dispensing mechanism; 161. Quick-drying glue dispensing mechanism; 162. UV glue dispensing mechanism; 163. Hot air drying mechanism; 164. UV lamp drying mechanism; 17. Polishing mechanism; 18. Unloading mechanism; 19. Coil pressing mechanism; 191. Coil pressing cylinder; 192. Pressing block; 193. Fixing sleeve; 194. Lower pressure column; 195. Elastic member D; 196. Top screw; 100. First infrared sensor; 110. Infrared detector; 20. Winding coil finishing device; 21. Second rotating Disc assembly; 22. Second feeding mechanism; 23. Third alignment mechanism; 231. Second infrared sensor; 232. Second mounting plate; 233. Second push cylinder; 234. Second adjusting wheel; 235. Second tensioning wheel; 236. Second driving wheel; 237. Second transmission belt; 238. Second motor; 24. Pin shaping mechanism; 241. Pin adjustment assembly; 2411. Support plate; 2412. Adjustment block; 2413. Inclined portion; 2414. First cylinder; 2415. Lifting mechanism; 242. Pin pressing assembly; 2421. Pressing plate; 2422. Second cylinder; 2423. Guide block; 25. Cutting mechanism; 251. Support frame; 252. Support block; 253. Connecting tube; 254 , sleeve; 255, spring; 256, needle body; 257, downward pressure cylinder; 26, transfer mechanism; 27, third infrared sensor; 30, intermediate fixed disk; 31, second push member; 40, first rotating disk assembly; 41, first positioning fixture; 411, first fixing seat; 412, first positioning assembly; 4121, first connecting plate A; 4122, first connecting plate B; 4123, connecting rod; 4124, positioning portion; 4125, first elastic member A; 413, first bearing seat; 4131, rotation drive portion; 4132, first positioning column; 4133, positioning notch; 414, first clamping assembly; 4141, first connecting block A; 4142, first connecting block B; 4143, first connecting column;4144, first clamping portion; 4145, first elastic member B; 50, second positioning fixture; 51, second fixing seat; 52, second positioning post; 521, second center channel; 522, groove; 53, second clamping assembly; 531, second connecting block A; 532, second connecting block B; 533, second connecting post; 534, second clamping portion; 535, second elastic member; 60, coreless motor rotor; 61, commutator assembly; 611, commutator segment; 612, motor shaft; 62, winding coil; 621, pin; 70, rotation drive unit; 71, mounting seat; 72, drive motor; 721, joint; 73, lifting assembly. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings.

[0043] like Figures 1-21 As shown, an automatic spot welding device for a hollow cup motor rotor includes a multi-station automatic assembly device 10 and a winding coil finishing device 20. The multi-station automatic assembly device 10 and the winding coil finishing device 20 are arranged on a base. The multi-station automatic assembly device 10 is used for automatically loading the commutator assembly 61 and assembling, welding, resistance testing, glue dispensing and packaging, polishing and unloading the commutator assembly 61 and the winding coil 62; the winding coil finishing device 20 is used to realize automatic loading of the winding coil 62, position alignment of the pin 621, shaping of the pin 621, cutting of the pin 621 and transportation of the winding coil 62.

[0044] The multi-station automatic assembly device 10 includes an intermediate fixed disk 30, a first rotating disk assembly 40, a first loading mechanism 11, a first alignment mechanism 12, a second alignment mechanism 13, a spot welding mechanism 14, a resistance testing mechanism 15, a dispensing mechanism 16, a polishing mechanism 17, and a unloading mechanism 18. The intermediate fixed disk 30 is fixedly installed on the base, and the first rotating disk assembly 40 is rotatably arranged on the outer periphery of the intermediate fixed disk 30. Specifically, the first rotating disk assembly 40 is rotatably connected to the base, and a first power unit for driving the first rotating disk assembly 40 to rotate intermittently is provided on the base. Multiple groups of first positioning fixtures 41 are circumferentially arranged on the first rotating disk assembly 40, and the number of first positioning assemblies 412 can be set according to the number of stations.

[0045] The first feeding mechanism 11 is used to automatically feed the commutator assembly 61 to the first positioning fixture 41. Specifically, the first feeding mechanism 11 includes a vibration plate 111, a shelf 112 and a picking mechanism 113. The vibration plate 111 is used to automatically sort the commutator assembly 61 (the shorter side of the motor shaft 612 is set upward) and transport it to the output end in an orderly manner. The vibration plate 111 automatically sorts the commutator assembly 61 and transports it in an orderly and directional manner, which belongs to the prior art and is not elaborated in the present invention. The shelf 112 is fixed Arranged at the output end of the vibration disk 111, the material rack 112 is provided with a material taking cavity 1121 with an upper opening and a material feeding channel 1122 connecting the material taking cavity 1121 and the output end of the vibration disk 111, and the material taking mechanism 113 includes a first clamping jaw assembly 1131 that can be opened and closed, a first transfer assembly A1132 that drives the first clamping jaw assembly 1131 to move back and forth vertically, and a first transfer assembly B1133 that drives the first clamping jaw assembly 1131 to move back and forth between the material rack 112 and the first positioning fixture 41.

[0046] The material shelf 112 is provided with a third positioning component 114 for positioning the commutator assembly 61 in the material taking cavity 1121 at a set position so as to facilitate the precise grasping of the first clamping claw assembly 1131. The third positioning component 114 includes a positioning pressure plate 1141 and a third elastic member 1142. The material shelf 112 is provided with a guide channel that slides horizontally with the positioning pressure plate 1141. The positioning pressure plate 1141 partially passes through the guide channel and extends into the material taking cavity 1121. The positioning pressure plate 1141 has a positioning groove 1143 that opens toward one side of the feed channel 1122. The commutator assembly 61 is positioned at the set position by the groove wall of the positioning groove 1143. Under the action of the third elastic member 1142, the positioning pressure plate 1141 has a positioning groove 1143 that opens toward one side of the material taking cavity 1121. The tendency of movement, the shelf 112 corresponds to the positioning pressure plate 1141 on both sides of which are respectively provided with limit plates 1144 for limiting the moving stroke of the positioning pressure plate 1141. Under normal circumstances, the positioning pressure plate 1141 is in a state of locking the commutator assembly 61 under the action of the third elastic member 1142, and the positioning pressure plate 1141 is provided with a flange 1145, and the flange 1145 is provided with an inclined surface. The first clamping jaw assembly 1131 is provided with an unlocking block 115. When the first clamping jaw assembly 1131 moves down to the clamping position, the unlocking block 115 drives the third positioning assembly 114 to move toward the unlocking position by pushing the inclined surface of the flange 1145 to unlock the locking of the commutator assembly 61 by the first positioning assembly 412, so that the first clamping jaw assembly 1131 can accurately clamp the commutator assembly 61.

[0047] The first alignment mechanism 12 is used to align the position of the commutator assembly 61. Specifically, the position of the commutator assembly 61 is adjusted by the first alignment mechanism 12 so that the commutator segment 611 of the commutator assembly 61 is in a set position. The first alignment mechanism 12 is a prior art and is not elaborated in the present invention. For details, please refer to the Chinese patent (patent publication number CN201659409U) entitled A workpiece rotation and downward pressure alignment device.

[0048] The second alignment mechanism 13 drives the winding coil 62 to rotate relative to the commutator assembly 61 so that the pin 621 corresponds to the commutator segment 611. Furthermore, an image recognition sensor 131 is provided at the position of the intermediate fixed disk 30 corresponding to the second alignment mechanism 13. The image recognition sensor 131 identifies whether the pin 621 of the winding coil 62 and the commutator segment 611 of the commutator assembly 61 are aligned, thereby assisting the second alignment mechanism 13 in adjusting the position of the pin 621 of the winding coil 62. Furthermore, a first push member 132 is provided at the position of the intermediate fixed disk 30 corresponding to the second alignment mechanism 13. The first push member 132 is used to drive the first clamping assembly 414 to switch from the clamping position to the unclamping position. The second alignment mechanism 13 includes a first mounting plate 133 and a first pushing cylinder 134 that drives the first mounting plate 133 to move longitudinally. The first mounting plate 133 is provided with a first adjusting wheel 135, a first tensioning wheel 136, and a first driving wheel 137. The first adjusting wheel 135 is provided in two groups and is flushly arranged on one side of the first mounting plate 133 adjacent to the first rotating disk assembly 40. A first transmission belt is wrapped around the outer periphery of the first adjusting wheel 135, the first tensioning wheel 136 and the first driving wheel 137. The lower end of the first mounting plate 133 is provided with a first motor 138 that drives the first driving wheel 137 to rotate. The winding coil 62 is driven to rotate relative to the commutator assembly 61 through the first transmission belt between the two first adjusting wheels 135, so that the pin 621 of the winding coil 62 corresponds to the commutator segment 611 of the commutator assembly 61.

[0049] The spot welding mechanism 14 is used to weld the pins 621 to the corresponding commutator segments 611 one by one. The spot welding mechanism 14 is a prior art and is not described in detail in the present invention. The resistance testing mechanism 15 is used to test the resistance values ​​of adjacent welding points. The resistance testing mechanism 15 measures the resistance values ​​by detecting two adjacent welding points. The resistance value can be used to determine whether the winding coil 62 has grounding, inter-turn short circuit, open circuit, short number of turns, and other problems, and complete the detection of whether there are welding problems at the connection welding points between the winding coil 62 and the commutator assembly 61. The resistance testing mechanism 15 and the testing method belong to the prior art and are not described in detail in the present invention. For example, please refer to the hollow cup motor coil detection system and method based on PLC control disclosed in Chinese Patent (Publication No. CN113917375B). The dispensing mechanism 16 is used to encapsulate the welding end face of the commutator assembly 61 and the winding coil 62. The dispensing mechanism 16 is a prior art and is not elaborated in the present invention. The polishing mechanism 17 is used to polish the outer peripheral surface of the motor shaft 612 of the commutator assembly 61. The polishing mechanism 17 solves the problem of the outer peripheral surface of the motor shaft 612 being uneven due to oxidation. The polishing mechanism 17 is a prior art and is not elaborated in the present invention. For details, please refer to a hollow cup motor rotor polishing mechanism disclosed in a Chinese patent (application announcement number CN220162086U). The unloading mechanism 18 is used to remove the processed hollow cup motor rotor 60.

[0050] In some embodiments, the first positioning fixture 41 includes a first fixed seat 411, a first positioning assembly 412 arranged on the first fixed seat 411, a first bearing seat 413 rotatably mounted on the first fixed seat 411, and a first clamping assembly 414 arranged on the first bearing seat 413. The lower part of the first bearing seat 413 has a rotation driving part 4131, and the first bearing seat 413 is provided with a first positioning column 4132. The first positioning column 4132 is provided with a first central channel through which the power supply shaft 612 passes. The first positioning column 4132 has a support portion adapted to the inner diameter of the winding coil 62. The first positioning assembly 412 can move between a locking position and an unlocking position. The first bearing seat 413 is locked to the first fixed seat 411 through the first positioning assembly 412. The first clamping assembly 414 can move between a clamping position and an unlocking position. The winding coil 62 and the commutator assembly 61 are clamped and fixed by the first clamping assembly 414. The first positioning assembly 412 includes a first connecting plate A4121, a first connecting plate B4122 and two connecting rods 4123 connecting the first connecting plate A4121 and the first connecting plate B4122. The first fixed seat 411 is provided with a first guide groove A set through it on both sides. The two connecting rods 4123 are respectively guided and matched with the corresponding first guide grooves A. The first supporting seat 413 is provided with a positioning notch 4133 facing the first connecting plate A4121. The first connecting plate A4121 is provided with a positioning portion 4124 that is positioned and matched with the positioning notch 4133. A first elastic member A4125 is provided between the first connecting plate B4122 and the first fixed seat 411. The first clamping assembly 414 includes a first connecting block A4141, a first connecting block B4142, and a first connecting column 4143 between the first connecting block A4141 and the first connecting block B4142. The first supporting seat 413 is provided with a first guide groove B for the first connecting column 4143 to extend and retract forward and backward. The first connecting block A4141 is provided with a first clamping portion 4144 on the side facing the first positioning column 4132. A first elastic member B4145 is provided between the first connecting block B4142 and the first supporting seat 413.

[0051] In some embodiments, the intermediate fixed plate 30 is respectively provided with a first pushing member 132 at the position corresponding to the transfer mechanism 26, the second alignment mechanism 13 and the unloading mechanism 18. The first pushing member 132 is used to drive the first clamping assembly 414 to switch from the clamping position to the releasing position. The function of the first pushing member 132 at the transfer mechanism 26 is to enable the transfer mechanism 26 to place the winding coil 62 at the winding coil finishing device 20 on the first positioning fixture 41 of the first rotating disk assembly 40, and the function of the first pushing member 132 at the second alignment mechanism 13 is to facilitate the second alignment mechanism 13 to drive the winding coil 62 to rotate relative to the commutator assembly 61, so that the pin 621 of the winding coil 62 corresponds to the pin 621 of the commutator assembly 61. In addition, since there is a certain rotational damping between the commutator assembly 61 and the first positioning column 4132, the winding coil 62 will not drive the commutator assembly 61 to rotate when it rotates, and the function of the first pushing member 132 at the unloading mechanism 18 is to facilitate the removal of the winding coil 62 from the first positioning fixture 41.

[0052] In some embodiments, the intermediate fixed disk 30 is respectively provided with a second pushing member 31 at the positions corresponding to the spot welding mechanism 14, the resistance testing mechanism 15, the glue dispensing mechanism 16, and the polishing mechanism 17. The second pushing member 31 is used to drive the first positioning assembly 412 to switch from a locked position to an unlocked position. The lower end of the first rotating disk assembly 40 is respectively provided with a rotation drive unit 70 at the positions corresponding to the spot welding mechanism 14, the resistance testing mechanism 15, the glue dispensing mechanism 16, and the polishing mechanism 17. The rotation drive unit 70 includes a mounting seat 71, a drive motor 72 fixedly mounted on the mounting seat 71, and a lifting assembly 73 for driving the mounting seat 71 to rise and fall. The output end of the drive motor 72 is provided with a joint portion 721 that cooperates with the rotation drive portion 4131. The drive motor 72 drives the first supporting seat 413 to rotate through the joint portion 721. The rotation drive unit 70 can drive the first supporting seat 413 to rotate relative to the first fixed seat 411, that is, drive the winding coil 62 and the commutator assembly 61 to rotate synchronously, so that the spot welding mechanism 14 can spot weld each group of corresponding pins 621 and commutator segments 611, the resistance testing mechanism 15 can test adjacent welding points, the glue dispensing mechanism 16 can glue and package the welding surface of the commutator assembly 61, and the polishing mechanism 17 can cooperate to polish the electronic axis.

[0053] The first pushing member 132 and the second pushing member 31 each include a pushing cylinder and a pushing block connected to the output end of the pushing cylinder, and the pushing cylinder drives the pushing block to move to achieve the pushing effect.

[0054] The resistance testing mechanism 15 includes a first testing mechanism 151 and a second testing mechanism 152. The first testing mechanism 151 is arranged between the spot welding mechanism 14 and the gluing mechanism 16. The second testing mechanism 152 is arranged between the polishing mechanism 17 and the unloading mechanism 18. The multi-station automatic assembly device 10 is also provided with a first waste removal mechanism 153. The first waste removal mechanism 153 is arranged at the next station of the first testing mechanism 151.

[0055] In some embodiments, the glue dispensing mechanism 16 includes a quick-drying glue dispensing mechanism 161 and a UV glue dispensing mechanism 162, and a hot air drying mechanism 163 and a UV lamp drying mechanism 164 are arranged between the glue dispensing mechanism 16 and the polishing mechanism 17, wherein the hot air drying mechanism 163 is arranged between the quick-drying glue dispensing mechanism 161 and the UV glue dispensing mechanism 162, and the UV lamp drying mechanism 164 is arranged at the next workstation of the UV glue dispensing mechanism 162.

[0056] The winding coil finishing device 20 includes a second rotating disk assembly 21, a second loading mechanism 22, a third alignment mechanism 23, a pin shaping mechanism 24, a cutting mechanism 25 and a transfer mechanism 26. Multiple groups of second positioning fixtures 50 are circumferentially arranged on the second rotating disk assembly 21. The second loading mechanism 22 is used to load the winding coil 62 to the second positioning fixture 50. The third alignment mechanism 23 is used to align the position of the pins 621 of the winding coil 62. The pin shaping mechanism 24 includes a pin adjustment assembly 241 for adjusting the pins 621 of the winding coil 62 to an equal angle setting and a pin pressing assembly 242 for pressing down the pins 621 of the winding coil 62. The cutting mechanism 25 is used to cut the pins 621 to a set length. The transfer mechanism 26 is used to transfer the winding coil 62 on the second rotating disk assembly 21 to the first rotating disk assembly 40.

[0057] The second positioning fixture 50 includes a second fixed seat 51, a second positioning column 52 fixed to the upper end surface of the second fixed seat 51, and a second clamping assembly 53 arranged on the second fixed seat 51. The second clamping assembly 53 can move between a clamping position and a release position. The winding coil 62 is clamped and fixed to the second positioning column 52 by the second clamping assembly 53. The second positioning column 52 is provided with a second central channel 521 with an upper end opening and three groups of grooves 522 arranged at equal angles on its upper end surface. The inner end of the groove 522 is communicated with the second central channel 521.

[0058] The second clamping assembly 53 includes a second connecting block A531, a second connecting block B532 and a second connecting column 533 between the second connecting block A531 and the second connecting block B532. The second fixing seat 51 is provided with a second guide groove for the second connecting column 533 to extend and retract forward and backward. The second connecting block A531 is provided with a second clamping portion 534 on the side facing the second positioning column 52. A second elastic member 535 is provided between the second connecting block B532 and the second fixing seat 51.

[0059] The base is provided with a storage tray for storing the winding coils 62, and the second loading mechanism 22 is used to load the winding coils 62 at the storage tray onto the second positioning fixture 50 of the second rotating disk assembly 21. The third alignment mechanism 23 includes a second infrared sensor 231 provided on the base, which detects whether the pins 621 of the winding coils 62 are in the set position through the second infrared sensor 231. The third alignment mechanism 23 includes a second mounting plate 232 and a second push cylinder 233 that drives the second mounting plate 232 to move longitudinally. The second mounting plate 232 is provided with a second adjusting wheel 234, a second tensioning wheel 235, and a second driving wheel 236. The second adjusting wheel 234 is provided in two groups and is flushly arranged on one side of the second mounting plate 232 adjacent to the second rotating disk assembly 21. A second transmission belt 237 is provided around the outer circumference of the second adjusting wheel 234, the second tensioning wheel 235, and the second driving wheel 236. The lower end of the second mounting plate 232 is provided with a second pushing cylinder 233 that drives the second driving wheel 236. The rotating second motor 238 drives the winding coil 62 to rotate relative to the second positioning fixture 50 through the second transmission belt 237 between the two second adjusting wheels 234, so that the pin 621 of the winding coil 62 moves to the set position. Specifically, when the second pushing cylinder 233 drives the second mounting plate 232 to move, the second mounting plate 232 will drive the second connecting block B532 to move toward the side of the compressed second elastic member 535, so that the second clamping part 534 of the second clamping assembly 53 moves toward the releasing position, so that the third alignment mechanism 23 can adjust the position of the winding coil 62.

[0060] The pin adjustment assembly 241 includes a support plate 2411, an adjustment block 2412, a first cylinder 2414 and a lifting mechanism 2415 for driving the support plate 2411 to rise and fall vertically. The lifting mechanism 2415 is a prior art and is not elaborated in the present invention. The support plate 2411 is provided with a through hole corresponding to the second positioning column 52 below. The adjustment block 2412 is provided with three groups and is distributed at equal angles on the periphery of the through hole. The adjustment block 2412 is provided with a symmetrically arranged inclined portion 2413 on one side adjacent to the through hole. The angle between the two inclined portions 2413 of the same adjustment block 2412 is equal to or slightly less than 120°. The first cylinder 2414 is provided with three groups and corresponds one-to-one to the adjustment block 2412. The first cylinder 2414 is used to drive the corresponding adjustment block 2412 to extend and retract along the center of the through hole. The three groups of pins 621 of the winding coil 62 can be clamped into an equal-angle setting through the pin adjustment component 241. In order to make the upturned pins 621 set horizontally to facilitate welding with the commutator segments 611 of the commutator assembly 61, the pin shaping mechanism 24 of the present invention also includes a pin pressing component, and the pin pressing component 242 includes a pressing plate 2421 and a second cylinder 2422. The pressing plate 2421 is provided with three groups and is set at equal angles. The second cylinder 2422 corresponds one-to-one to the pressing plate 2421. The second cylinder 2422 is used to drive the pressing plate 2421 to extend and retract along the center of the through hole. The pin pressing component 242 can press the pins 621 of the winding coil 62 down into the corresponding groove 522 of the second positioning column 52. The lower pressing plate 2421 is connected to the output end of the second cylinder 2422 through the guide block 2423. A support seat is provided on the support plate 2411. The support seat is provided with guide grooves that are respectively guided and matched with the adjustment block 2412 and the guide block 2423.

[0061] The cutting mechanism 25 includes a support frame 251, a support block 252 slidably mounted on the support frame 251, a connecting tube 253 fixedly mounted on the support block 252, a sleeve 254 slidably mounted within the connecting tube 253, a spring 255 for driving the sleeve 254 upward, a needle portion 256 fixedly connected to the support block 252, and a downward-pressing cylinder 257 for pressing the support block 252 downward. The sleeve 254 is centrally provided with an escape channel that guides the needle portion 256. The outer diameter of the needle portion 256 matches the aperture of the second central channel 521 of the second positioning post 52. The cutting mechanism 25 cuts the pins 621 of the winding coil 62 to a predetermined length to facilitate subsequent welding.

[0062] Preferably, the first rotating disk assembly 40 of the present invention is provided with twenty-four workstations, that is, twenty-four first positioning fixtures 41 are provided on the first rotating disk assembly 40, the first workstation is a loading workstation, and a first loading mechanism 11 is provided at the first workstation. The first loading mechanism 11 is used to automatically load the commutator assembly 61 to the first positioning fixture 41, the second workstation is a first alignment workstation, and the first alignment mechanism 12 is provided at the second workstation for aligning the position of the commutator segment 611 of the commutator assembly 61, the third workstation is a detection workstation, and a first infrared sensor 100 is provided at the middle fixed disk corresponding to the third workstation, and the first infrared sensor 100 is used to detect whether there is a commutator assembly 61 on the first positioning fixture 41 at the third workstation, and the first infrared sensor 100 is used to detect whether there is a commutator assembly 61 on the first positioning fixture 41 at the third workstation. The fourth station is an assembly station; the fourth station corresponds to the transfer mechanism 26 of the winding coil finishing device 20, and the finished winding coil 62 is transferred to the periphery of the commutator assembly 61 of the fourth station through the transfer mechanism 26; the fifth station, the eighth station and the twelfth station are all coil pressing stations, and the positions of the intermediate fixed disk 30 corresponding to the fifth station, the eighth station and the twelfth station are all provided with a coil pressing mechanism 19, and the winding coil 62 pin 621 is pre-pressed by the coil pressing mechanism 19 at the fifth station, so that the image recognition sensor 131 at the seventh station can detect the position of the pin 621; the sixth station is an empty station, and the sixth station is used to coordinate the problem of different processing times required for each station to complete the processing; the seventh station is the second alignment station, and the seventh station is connected to the twelfth station through the first station. The second alignment mechanism 13 cooperates with the image recognition sensor 131 to make the positions of the winding coil 62 and the pin 621 correspond to the position of the commutator segment 611 of the commutator assembly 61; the coil pressing mechanism 19 at the eighth station is used to press down the pin 621 of the winding coil 62 so that it fits with the commutator segment 611 of the commutator assembly 61, thereby facilitating the spot welding mechanism 14 at the ninth station to spot weld the pin 621 and the commutator segment 611; the ninth station is a spot welding station, and the spot welding mechanism 14 spot welds each group of pins 621 of the pressed winding coil 62 to the corresponding commutator segment 611 of the commutator assembly 61 one by one; the tenth station and the twenty-second station are both resistance testing stations, and the position of the middle fixed disk 30 corresponding to the tenth station is provided with a first test Mechanism 151, through the first testing mechanism 151 to measure the resistance value of adjacent welding points, thereby detecting whether the welding is qualified; the eleventh station is the NG removal station, and the first scrap removal mechanism 153 is set at the eleventh station. The first scrap removal mechanism 153 at the eleventh station is used to remove the hollow cup motor rotor 60 (winding coil 62 and commutator assembly 61) that is detected as unqualified. The coil pressing mechanism 19 at the twelfth station is used to solve the problem of the pin 621 of the car being warped due to the high temperature generated during spot welding. The thirteenth station is a quick-drying glue station, and the quick-drying glue application mechanism 161 at the quick-drying glue application station is used to quick-dry glue one end of the pin 621 of the winding coil 62 and the commutator segment 611 of the commutator assembly 61;The fourteenth and fifteenth stations are hot air drying stations, and the intermediate fixed disk 30 is provided with a hot air drying mechanism 163 at the position corresponding to the fourteenth and fifteenth stations, and the quick-drying glue is quickly dried by the hot air drying mechanism 163; the sixteenth station is a UV glue point station, and the intermediate fixed disk 30 is provided with a UV glue point mechanism 162 at the sixteenth station, and the commutator assembly 61 and the winding coil 62 are welded end faces by the UV glue point mechanism 162; the seventeenth station is an empty station, and the seventeenth station is used to coordinate the different time required for each station to complete the processing; the eighteenth, nineteenth and twentieth stations are all UV lamp drying stations, and the intermediate fixed disk 30 is provided with a UV lamp drying mechanism 164 at the eighteenth, nineteenth and twentieth stations respectively, and the UV lamp drying mechanism 164 is used to UV The glue is quickly dried; the 21st station is a polishing station, where the polishing mechanism 17 is used to polish the outer circumference of the motor shaft 612 of the commutator assembly 61; the 22nd station is a resistance testing station, and a second testing mechanism 152 is installed at the position corresponding to the 22nd station on the intermediate fixed plate 30. This second testing mechanism 152 measures the resistance of adjacent solder joints to detect whether the soldering is qualified; the 23rd station is a blanking station, where the blanking mechanism 18 is used to remove qualified hollow cup motor rotors 60 and reject unqualified hollow cup motor rotors 60; the 24th station is a residue detection station, where an infrared detector 110 is installed to detect whether there is any workpiece (hollow cup motor rotor 60) remaining on the first positioning fixture 41 of this station.

[0063] The coil pressing mechanism 19 includes a coil pressing cylinder 191, a pressing block 192 connected to the output end of the coil pressing cylinder 191, a fixing sleeve 193 fixed to the pressing block 192, a lower pressing column 194 slidably arranged in the fixing sleeve 193, a top screw 196 fixedly arranged at the upper end of the fixing sleeve 193, and an elastic member D195 abutted between the top screw 196 and the lower pressing column 194. The lower pressing column 194 extends out of the fixing sleeve 193 under the action of the elastic member D195. The lower end surface of the lower pressing column 194 is provided with an open groove. Specifically, the top screw 196 is threadedly connected to the fixing sleeve 193. The end of the top screw 196 is provided with a screwing groove for easy screwing. The winding coil 62 is pressed down through the lower pressing column 194.

[0064] Preferably, the second rotating disk assembly 21 of the present invention is provided with eight stations, that is, the second rotating disk assembly 21 is provided with eight second positioning fixtures 50, wherein the first station is a loading station, and a second loading mechanism 22 is provided at the first station, and the winding coil 62 is automatically loaded onto the second positioning fixture 50 by the second loading mechanism 22; the second station is an empty station, and the second station is used to coordinate the problem of different processing times required for each station to complete the processing; the third station is an alignment station, and a third alignment mechanism 23 is provided at the alignment station, and the position of the winding coil 62 is aligned by the third alignment mechanism 23, that is, it is used to set the position of the pin 621 of the winding coil 62 at the set position; the fourth station is an empty station, and the fourth station is used to coordinate the problem of different processing times required for each station to complete the processing; the fifth station is a shaping station, and a pin adjustment group is provided at the fifth station. The sixth station is a cutting station, and a cutting mechanism 25 is provided at the sixth station. The cutting mechanism 25 is used to cut the pins 621 of the winding coil 62 to a set length. The seventh station is a transfer station, and a transfer mechanism 26 is provided at the transfer station. The winding coil 62 on the second rotary disk assembly 21 (second positioning fixture 50) is transferred to the assembly station (first positioning fixture 41) of the first rotary disk assembly 40 through the transfer mechanism 26. The eighth station is a residual detection station, and a third infrared sensor 27 is provided at the eighth station. The third infrared sensor 27 is used to detect whether there is any residual winding coil 62 at the station.

[0065] In summary, the present invention has the following beneficial effects:

[0066] The automatic spot welding equipment for hollow cup motor rotors of the present invention can not only realize automatic loading of winding coils 62, position alignment of pins 621, shaping of pins 621, cutting of pins 621 and transportation, but also realize automatic assembly, position correction, spot welding fixation, resistance testing, glue dispensing packaging, polishing and automatic unloading of commutator assembly 61 and winding coils 62, thereby realizing fully automated production and processing of hollow cup rotors, greatly improving production efficiency and saving labor costs.

[0067] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. An automatic spot welding device for coreless motor rotors, characterized by: include A multi-station automatic assembly device (10) comprises an intermediate fixed disk (30), a first rotating disk assembly (40), a first feeding mechanism (11), a first alignment mechanism (12), a second alignment mechanism (13), a spot welding mechanism (14), a resistance testing mechanism (15), a dispensing mechanism (16), a polishing mechanism (17), and a feeding mechanism (18). The first rotating disk assembly (40) is rotatably arranged on the outer periphery of the intermediate fixed disk (30). A plurality of first positioning fixtures (41) are circumferentially arranged on the first rotating disk assembly (40). The first feeding mechanism (11) is used to automatically feed the commutator assembly (61) to the first positioning fixture (41). The first alignment mechanism (12) is used to align the commutator assembly (61). The commutator assembly (61) is positioned, the second alignment mechanism (13) drives the winding coil (62) to rotate relative to the commutator assembly (61) so that the pin (621) corresponds to the commutator segment (611), the spot welding mechanism (14) is used to weld the pin (621) to the corresponding commutator segment (611) one by one, the resistance testing mechanism (15) is used to test the resistance value of adjacent welding points, the glue dispensing mechanism (16) is used to encapsulate the welding end surface of the commutator assembly (61) and the winding coil (62), the polishing mechanism (17) is used to polish the outer peripheral surface of the motor shaft (612) of the commutator assembly (61), and the unloading mechanism (18) is used to take out the hollow cup motor rotor (60) after processing; A winding coil finishing device (20) comprises a second rotating disk assembly (21), a second feeding mechanism (22), a third alignment mechanism (23), a pin shaping mechanism (24), a cutting mechanism (25) and a transfer mechanism (26), wherein a plurality of second positioning fixtures (50) are arranged circumferentially on the second rotating disk assembly (21), the second feeding mechanism (22) is used to feed the winding coil (62) to the second positioning fixture (50), and the third alignment mechanism (23) is used to align the pins (621). ), the pin shaping mechanism (24) includes a pin adjusting component (241) for adjusting the pins (621) of the winding coil (62) to an equal angle setting and a pin pressing component (242) for pressing down the pins (621) of the winding coil (62), the cutting mechanism (25) for cutting the pins (621) to a set length, and the transport mechanism (26) for transporting the winding coil (62) on the second rotating disk component (21) to the first rotating disk component (40).

2. The automatic spot welding equipment for coreless motor rotors according to claim 1, characterized in that: The first positioning fixture (41) comprises a first fixed seat (411), a first positioning assembly (412) arranged on the first fixed seat (411), a first bearing seat (413) rotatably mounted on the first fixed seat (411), and a first clamping assembly (414) arranged on the first bearing seat (413). The lower part of the first bearing seat (413) has a rotation driving part (4131). The first bearing seat (413) is provided with a first positioning column (4132). The first positioning column (4132) is provided with a power supply shaft ( 612) passes through a first central channel, the first positioning column (4132) has a support portion adapted to the inner diameter of the winding coil (62), the first positioning component (412) is movable between a locking position and an unlocking position, the first bearing seat (413) is locked to the first fixing seat (411) by the first positioning component (412), the first clamping component (414) is movable between a clamping position and an unlocking position, the winding coil (62) and the commutator component (61) are clamped and fixed by the first clamping component (414).

3. The automatic spot welding equipment for coreless motor rotors according to claim 2, characterized in that: The intermediate fixed plate (30) is provided with a first pushing member (132) at the position corresponding to the transfer mechanism (26), the second alignment mechanism (13) and the unloading mechanism (18), respectively. The first pushing member (132) is used to drive the first clamping assembly (414) to switch from the clamping position to the releasing position.

4. The automatic spot welding equipment for coreless motor rotors according to claim 3, characterized in that: An image recognition sensor (131) is provided on the intermediate fixed disk (30) at a position corresponding to the second alignment mechanism (13). The image recognition sensor (131) identifies whether the pins (621) of the winding coil (62) and the commutator segments (611) of the commutator assembly (61) are aligned, thereby assisting the second alignment mechanism (13) in adjusting the positions of the pins (621) of the winding coil (62).

5. The automatic spot welding equipment for coreless motor rotors according to claim 2, characterized in that: The positions of the intermediate fixed disk (30) corresponding to the spot welding mechanism (14), the resistance testing mechanism (15), the dispensing mechanism (16), and the polishing mechanism (17) are respectively provided with second pushing members (31), and the second pushing members (31) are used to drive the first positioning assembly (412) to switch from a locked position to an unlocked position. The positions of the lower end of the first rotating disk assembly (40) corresponding to the spot welding mechanism (14), the resistance testing mechanism (15), the dispensing mechanism (16), and the polishing mechanism (17) are respectively provided with rotation drive units (70). The rotation drive unit (70) comprises a mounting seat (71), a driving motor (72) fixedly mounted on the mounting seat (71), and a lifting assembly (73) for driving the mounting seat (71) to rise and fall. The output end of the driving motor (72) is provided with a joint portion (721) matched with the rotation driving portion (4131), and the driving motor (72) drives the first bearing seat (413) to rotate through the joint portion (721).

6. The automatic spot welding equipment for coreless motor rotors according to claim 1, characterized in that: The resistance testing mechanism (15) comprises a first testing mechanism (151) and a second testing mechanism (152), wherein the first testing mechanism (151) is arranged between the spot welding mechanism (14) and the glue dispensing mechanism (16), and the second testing mechanism (152) is arranged between the polishing mechanism (17) and the blanking mechanism (18). The multi-station automatic assembly device (10) is further provided with a first waste removal mechanism (153), which is arranged at a station below the first testing mechanism (151).

7. The automatic spot welding equipment for coreless motor rotors according to claim 6, characterized in that: The glue dispensing mechanism (16) comprises a quick-drying glue dispensing mechanism (161) and a UV glue dispensing mechanism (162); a hot air drying mechanism (163) and a UV lamp drying mechanism (164) are arranged between the glue dispensing mechanism (16) and the polishing mechanism (17); the hot air drying mechanism (163) is arranged between the quick-drying glue dispensing mechanism (161) and the UV glue dispensing mechanism (162); and the UV lamp drying mechanism (164) is arranged at the next station of the UV glue dispensing mechanism (162).

8. The automatic spot welding equipment for coreless motor rotors according to claim 1, characterized in that: The second positioning fixture (50) comprises a second fixing seat (51), a second positioning column (52) fixed to the upper end surface of the second fixing seat (51), and a second clamping assembly (53) arranged on the second fixing seat (51). The second clamping assembly (53) is movable between a clamping position and a releasing position. The winding coil (62) is clamped and fixed to the second positioning column (52) by the second clamping assembly (53).

9. The automatic spot welding equipment for coreless motor rotors according to claim 1, characterized in that: The pin adjustment component (241) includes a support plate (2411), an adjustment block (2412), a first cylinder (2414), and a lifting mechanism (2415) for driving the support plate (2411) to move vertically up and down. The support plate (2411) is provided with a through hole corresponding to the second positioning column (52) below. The adjustment block (2412) is provided with three groups and is distributed at equal angles on the periphery of the through hole. A symmetrically arranged inclined portion (2413) is provided on one side of the adjustment block (2412) adjacent to the through hole. The angle between the two inclined portions (2413) of the same adjustment block (2412) is equal to or slightly less than 120°. The first cylinder (2414) is provided with three groups and corresponds one to one with the adjustment block (2412). The first cylinder (2414) is used to drive the corresponding adjustment block (2412) to extend and retract along the center of the through hole.

10. The automatic spot welding equipment for coreless motor rotors according to claim 1, characterized in that: The cutting mechanism (25) comprises a support frame (251), a support block (252) slidably arranged on the support frame (251), a connecting tube (253) fixedly arranged on the support block (252), a sleeve (254) slidably arranged in the connecting tube (253), a spring (255) for driving the sleeve (254) to move upward, a needle body (256) fixedly connected to the support block (252), and a downward pressing cylinder (257) for driving the support block (252) to press downward, wherein an avoidance channel is provided at the center of the sleeve (254) to guide and cooperate with the needle body (256), and the outer diameter of the needle body (256) is adapted to the aperture of the second central channel (521) of the second positioning column (52).

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