Automatic spot welding equipment for coreless motor rotor

Abstract

The invention discloses coreless motor rotor automatic spot welding equipment which is characterized in that a multi-station automatic assembling device comprises a middle fixing disc, a first rotating disc 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 discharging mechanism; the first rotating disc assembly is rotatably arranged on the periphery of the middle fixing disc, multiple sets of first positioning clamps are arranged on the first rotating disc assembly in the circumferential direction, and the winding coil finishing device comprises a second rotating disc assembly, a second feeding mechanism, a third alignment mechanism, a pin shaping mechanism, a cutting mechanism and a transferring mechanism. Through the arrangement, full-automatic production and machining of the hollow cup type rotor can be achieved, the production efficiency is greatly improved, and the labor cost is saved.

Description

Technical Field

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

[0002] Hollow cup motors are widely used in military, aerospace, civil appliances, industrial products and other fields because of 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. A plurality of groups of commutator segments are circumferentially distributed on the upper end surface of the commutator, and a plurality of groups of pins are arranged 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 coils and the commutator segments of the commutator are manually welded together. The above operations are completed by manual work. Workers often manually rotate the hollow cup motor rotor to better align the welded parts to facilitate operation, or workers have to hold a welding gun and turn 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 a hollow cup motor rotor, which can not only realize automatic loading, alignment, shaping, cutting and transportation of winding coils, but also can automatically correct the position, spot weld fixation, resistance test, glue dispensing packaging, polishing treatment and automatic unloading of commutator components and winding coils, thereby realizing fully automated production, greatly improving production efficiency and saving labor costs.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a hollow cup motor rotor automatic spot welding device, comprising: A multi-station automatic assembly device comprises 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 feeding 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 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 feeding mechanism is used to take out the hollow cup motor rotor that has been processed. 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. The second feeding mechanism is used to feed the winding coil to the second positioning fixture. The third alignment mechanism is used to align the position of the pin. The pin shaping mechanism includes a pin adjusting 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.

[0007] 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 rotating drive part, 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 supporting part 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 by the first positioning assembly, the first clamping assembly can move between a clamping position and an unlocking position, and the winding coil and the commutator assembly are clamped and fixed by the first clamping assembly.

[0008] Furthermore, the intermediate fixed plate is provided with a first pushing member at the position corresponding to the transfer mechanism, the second alignment mechanism and the unloading mechanism, respectively, and the first pushing member is used to drive the first clamping assembly to switch from the clamping position to the releasing position.

[0009] Furthermore, an image recognition sensor is provided at the position of the middle fixed disk corresponding to the second alignment mechanism, and the image recognition sensor is used to identify whether the pins of the winding coil and the commutator segments of the commutator assembly are aligned, thereby assisting the second alignment mechanism to adjust the pin positions of the winding coil.

[0010] Furthermore, the positions of the intermediate fixed disk corresponding to the spot welding mechanism, the resistance testing mechanism, the glue dispensing 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 spot welding mechanism, the resistance testing mechanism, the glue dispensing mechanism, and the polishing mechanism are respectively provided with rotation driving units at the lower end of the first rotating disk assembly, and the rotation driving unit includes a mounting seat, a driving motor fixedly mounted on the mounting seat, and a lifting assembly for driving the mounting seat to rise and fall, and the output end of the driving motor is provided with a joint part cooperating with the rotation driving part, and the driving motor drives the first bearing seat to rotate through the joint part.

[0011] 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, the second testing mechanism is arranged between the polishing mechanism and the unloading mechanism, and 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.

[0012] 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.

[0013] 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 by the second clamping assembly.

[0014] 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 distributed at equal angles on the periphery of the through hole, a 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 blocks, and the first cylinder is used to drive the corresponding adjustment block to extend and retract along the center of the through hole.

[0015] 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 cooperating with the guide of the needle body portion is provided at 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.

[0016] In summary, the present invention has the following beneficial effects: 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

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the multi-station automatic assembly device of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the first feeding mechanism of the present invention.

[0020] Figure 4 It is a structural schematic diagram of the material shelf of the present invention.

[0021] Figure 5 The present invention Figure 4 Enlarged view of point A.

[0022] Figure 6 It is a structural schematic diagram of the positioning pressing plate of the present invention.

[0023] Figure 7 It is a structural schematic diagram of the first positioning fixture of the present invention.

[0024] Figure 8 It is a top view of the first positioning fixture of the present invention.

[0025] Fig. 9 The present invention Figure 8 Enlarged view of point B.

[0026] Fig.10 It is a structural schematic diagram of the rotary drive unit of the present invention.

[0027] Fig.11 It is a structural schematic diagram of the second alignment mechanism of the present invention.

[0028] Fig.12 It is a structural schematic diagram of the winding coil finishing device of the present invention.

[0029] Fig.13 It is a top view of the winding coil finishing device of the present invention.

[0030] Fig.14 It is a schematic structural diagram of the second positioning fixture of the present invention.

[0031] Fig.15 It is a structural schematic diagram of the third alignment mechanism of the present invention.

[0032] Fig.16 It is a top view of the third alignment mechanism of the present invention.

[0033] Fig.17 It is a structural schematic diagram of the pin shaping mechanism of the present invention.

[0034] Fig.18 It is a top view of the pin shaping mechanism of the present invention.

[0035] Fig.19 It is a schematic diagram of the inclined portion of the present invention.

[0036] Fig. 20 It is a schematic structural diagram of the cutting mechanism of the present invention.

[0037] Fig.21 It is a structural schematic diagram of the coil pressing mechanism of the present invention.

[0038] In the figure: 10, multi-station automatic assembly device; 11, first feeding mechanism; 111, vibration plate; 112, shelf; 1121, material taking cavity; 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 material 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. Feeding mechanism; 19. Coil pressing mechanism; 191. Coil pressing cylinder; 192. Pressing block; 193. Fixing sleeve; 194. Lower pressing column; 195. Elastic member D; 196. Top screw; 100. First infrared sensor; 110. Infrared detector; 20. Winding coil finishing device; 21. Second rotating Disk assembly; 22, second feeding mechanism; 23, third alignment mechanism; 231, second infrared sensor; 232, second mounting plate; 233, second push cylinder; 234, second adjustment wheel; 235, second tension 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 fixed seat; 412, first positioning assembly; 4121, first connecting plate A; 4122, first connecting plate B; 4123, connecting rod; 4124, positioning part; 4125, first elastic member A; 413, first bearing seat; 4131, rotation drive part; 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 part; 4145, first elastic member B; 50, second positioning fixture; 51, second fixing seat; 52, second positioning column; 521, second central channel; 522, groove; 53, second clamping assembly; 531, second connecting block A; 532, second connecting block B; 533, second connecting column; 534, second clamping part; 535, second elastic member; 60, hollow cup 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 part; 73, lifting assembly. ; DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] like Figure 1-Figure 21 As shown, an automatic spot welding device for a coreless motor rotor comprises a multi-station automatic assembly device 10 and a winding coil finishing device 20, wherein the multi-station automatic assembly device 10 and the winding coil finishing device 20 are arranged on a base, and the multi-station automatic assembly device 10 is used for automatic loading of a commutator assembly 61 and for assembling, welding, resistance testing, glue dispensing packaging, polishing and unloading the commutator assembly 61 and the winding coil 62; the winding coil finishing device 20 is used for realizing 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.

[0041] 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 arranged on the base. A plurality 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.

[0042] 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 material taking 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 automatic sorting and orderly directional transportation of the commutator assembly 61 by the vibration plate 111 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 shelf 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 jaw assembly 1131 that can be opened and closed, a first transfer assembly A1132 that drives the first jaw assembly 1131 to reciprocate vertically, and a first transfer assembly B1133 that drives the first jaw assembly 1131 to reciprocate between the material shelf 112 and the first positioning fixture 41.

[0043] The material shelf 112 is provided with a third positioning assembly 114 for positioning the commutator assembly 61 in the material taking cavity 1121 at a set position so as to facilitate accurate grasping by the first clamping claw assembly 1131. The third positioning assembly 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 transversely 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 feeding channel 1122. The commutator assembly 61 is positioned at a 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 feeding cavity 1121. The tendency of movement, the shelf 112 corresponds to the positioning plate 1141 and is respectively provided with a limit plate 1144 on both sides of the positioning plate 1141 for limiting the moving stroke of the positioning plate 1141. Under normal circumstances, the positioning plate 1141 is in a state of locking the commutator assembly 61 under the action of the third elastic member 1142. The positioning 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.

[0044] The first alignment mechanism 12 is used for aligning 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 rotating downward alignment device.

[0045] 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. Further, the intermediate fixed disk 30 is provided with an image recognition sensor 131 at a position 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 to adjust the position of the pin 621 of the winding coil 62. Further, the intermediate fixed disk 30 is provided with a first push member 132 at a position 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 for driving 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 wound around the outer circumference of the first adjusting wheel 135, the first tensioning wheel 136 and the first driving wheel 137. A first motor 138 for driving the first driving wheel 137 to rotate is provided at the lower end of the first mounting plate 133. 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.

[0046] 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 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 the welding points adjacent to each other. The resistance value can be used to determine whether the winding coil 62 has grounding, short circuit between turns, open circuit, shortage of turns and other problems, and complete the detection of whether there are welding problems at the connecting welding points of 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 the present invention. For example, the hollow cup motor coil detection system and method based on PLC control disclosed in Chinese Patent (Publication No. CN113917375B) can be referred to. The glue dispensing mechanism 16 is used to encapsulate the welding end face of the commutator assembly 61 and the winding coil 62. The glue 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 take out the processed hollow cup motor rotor 60.

[0047] 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 rotating 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 motor shaft 612 passes. The first positioning column 4132 has a supporting part 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 by 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. First guide grooves A are respectively provided on both sides of the first fixed seat 411. The two connecting rods 4123 are respectively guided and matched with the corresponding first guide grooves A. The first bearing 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 which is positioned and matched with the positioning notch 4133. A first elastic member A4125 is abutted 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, and a first elastic member B4145 is disposed between the first connecting block B4142 and the first supporting seat 413.

[0048] 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, and the first pushing member 132 is used to drive the first clamping assembly 414 to switch from the clamping position to the unclamping 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.

[0049] In some embodiments, the positions of the intermediate fixed disk 30 corresponding to the spot welding mechanism 14, the resistance testing mechanism 15, the glue 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 glue dispensing mechanism 16, and the polishing mechanism 17 are respectively provided with rotation drive units 70, and the rotation drive unit 70 includes 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, and the output end of the driving motor 72 is provided with a joint part 721 that cooperates with the rotation driving part 4131, and the driving motor 72 drives the first bearing seat 413 to rotate through the joint part 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 polish the electronic axis.

[0050] The first pushing member 132 and the second pushing member 31 both 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.

[0051] 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 glue dispensing 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.

[0052] 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.

[0053] The winding coil finishing device 20 includes 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. A plurality of second positioning fixtures 50 are circumferentially arranged 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. 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.

[0054] 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 unclamping 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 center channel 521 with an upper end opening and three groups of grooves 522 arranged at equal angles on its upper end surface. The inner ends of the grooves 522 are connected to the second center channel 521.

[0055] 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, a second clamping portion 534 is provided on the side of the second connecting block A531 facing the second positioning column 52, and a second elastic member 535 is abutted against the second connecting block B532 and the second fixing seat 51.

[0056] The base is provided with a storage tray for storing the winding coil 62, and the second loading mechanism 22 is used to load the winding coil 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 arranged on the base, and the second infrared sensor 231 is used to detect whether the pin 621 of the winding coil 62 is in the set position. 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 with two groups and is flushly arranged on one side of the second mounting plate 232 adjacent to the second rotating disk assembly 21. The outer periphery of the second adjusting wheel 234, the second tensioning wheel 235 and the second driving wheel 236 is surrounded by a second transmission belt 237. The lower end of the second mounting plate 232 is provided with a second push cylinder 233 that drives the second driving wheel 236 to move longitudinally. 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 portion 534 of the second clamping assembly 53 moves toward the unclamping position, so that the third alignment mechanism 23 can adjust the position of the winding coil 62.

[0057] 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 vertically lift and lower. 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. 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. 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 be 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 to the pressing plate 2421 one by one. 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 grooves 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 .

[0058] The cutting mechanism 25 includes a support frame 251, a support block 252 slidably disposed on the support frame 251, a connecting tube 253 fixedly disposed on the supporting block 252, a sleeve 254 slidably disposed in the connecting tube 253, a spring 255 for driving the sleeve 254 to move upward, a needle body 256 fixedly connected to the supporting block 252, and a downward pressing cylinder 257 for driving the supporting block 252 downward. The center of the sleeve 254 is provided with an escape channel for guiding and cooperating with the needle body 256. 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. The length of the pin 621 of the winding coil 62 is cut to a set length by the cutting mechanism 25 for subsequent welding.

[0059] 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, 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, 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, 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, and the first 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 time required for each station to complete the processing; the seventh station is the second alignment station, and the position of the winding coil 62 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 time required for each station to complete the processing; the seventh station is the second alignment station, and the seventh station is the second alignment station. The second alignment mechanism 13 and the image recognition sensor 131 cooperate to make the positions of the winding coil 62 and the pin 621 correspond to the positions of the commutator segments 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 segments 611 of the commutator assembly 61, so as to facilitate the spot welding mechanism 14 at the ninth station to spot weld the pin 621 and the commutator segments 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 with the corresponding commutator segments 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, the resistance value of adjacent welding points is measured by the first testing mechanism 151, so as to detect whether the welding is qualified; the eleventh station is the NG removal station, and the first scrap removal mechanism 153 is arranged at the eleventh station, and the hollow cup motor rotor 60 (winding coil 62 and commutator assembly 61) detected as unqualified is removed by the first scrap removal mechanism 153 at the eleventh station; the coil pressing mechanism 19 at the twelfth station is used to solve the problem of the upward warping of the pin 621 of the car due to the high temperature generated during spot welding; the thirteenth station is the quick-drying glue point station, and the quick-drying glue point mechanism 161 at the quick-drying glue point station is used to quick-dry glue the pin 621 of the winding coil 62 and one end of 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 dispensing station, and the intermediate fixed disk 30 is provided with a UV glue dispensing mechanism 162 at the sixteenth station, and the commutator assembly 61 and the welding end face of the winding coil 62 are encapsulated by the UV glue dispensing mechanism 162; the seventeenth station is an empty station, and the seventeenth station is used to coordinate the problem of different processing times required for each station; the eighteenth, nineteenth and twentieth stations are all UV lamp drying stations, and the intermediate fixed disk 30 is provided with UV lamp drying mechanisms 164 at the eighteenth, nineteenth and twentieth stations respectively, and the UV lamp drying mechanisms 164 are used to UV The glue is dried quickly; the 21st station is a polishing station, and the polishing mechanism 17 is used to polish the outer peripheral surface of the motor shaft 612 of the commutator assembly 61; the 22nd station is a resistance test station, and the middle fixed plate 30 is provided with a second test mechanism 152 at the position corresponding to the 22nd station, and the resistance value of the adjacent welding points is measured by the second test mechanism 152, so as to detect whether the welding is qualified; the 23rd station is a blanking station, and the blanking mechanism 18 at the blanking station is used to take out the qualified hollow cup motor rotor 60 and remove the unqualified hollow cup motor rotor 60; the 24th station is a residual detection station, and an infrared detector 110 is provided at the 24th station, and the infrared detector 110 is used to detect whether there is a workpiece (hollow cup motor rotor 60) remaining on the first positioning fixture 41 of the station. ;

[0060] 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 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 pressing column 194. The pressing column 194 extends out of the fixing sleeve 193 under the action of the elastic member D195. The lower end surface of the 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 by the pressing column 194.

[0061] 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 time 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 time required for each station to complete the processing; the fifth station is a shaping station, and a pin adjustment group 23 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 transfer mechanism 26 transfers the winding coil 62 on the second rotating disk assembly 21 (second positioning fixture 50) to the assembly station (first positioning fixture 41) of the first rotating disk assembly 40. 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.

[0062] In summary, the present invention has the following beneficial effects: 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 treatment and automatic unloading of commutator components 61 and winding coils 62, thereby realizing fully automated production and processing of hollow cup rotors, greatly improving production efficiency and saving labor costs.

[0063] The above description is only a preferred embodiment of the present invention, so all 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 in that: 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), wherein 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 for automatically feeding a commutator assembly (61) to the first positioning fixture (41), and the first alignment mechanism (12) is used for aligning 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) and 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) comprises 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 rotor according to claim 1 is 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), wherein 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), and the first positioning column (4132) is provided with a power supply motor shaft ( The first central channel (413) passes through the first central channel of the first commutator assembly (612), the first positioning column (4132) has a supporting 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 assembly (61) are clamped and fixed by the first clamping component (414).

3. The automatic spot welding equipment for coreless motor rotor according to claim 2 is 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 rotor according to claim 3 is characterized by: 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) recognizes 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 position of the pins (621) of the winding coil (62).

5. The automatic spot welding equipment for coreless motor rotor according to claim 2 is characterized in that: The positions of the intermediate fixed disk (30) corresponding to the spot welding mechanism (14), the resistance testing mechanism (15), the glue 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 locking position to an unlocking 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 glue dispensing mechanism (16), and the polishing mechanism (17) are respectively provided with rotation drive units (70), and 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 drive 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 rotor according to claim 1, characterized in that: The resistance testing mechanism (15) comprises 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 glue dispensing 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 material removal mechanism (153); the first waste material removal mechanism (153) is arranged at a next station of the first testing mechanism (151).

7. The automatic spot welding equipment for coreless motor rotor 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), 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 station of the UV glue dispensing mechanism (162).

8. The automatic spot welding equipment for coreless motor rotor according to claim 1 is characterized by: 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 rotor according to claim 1, characterized in that: The pin adjustment component (241) comprises 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 distributed at equal angles on the periphery of the through hole, a side of the adjustment block (2412) adjacent to the through hole is provided with symmetrically arranged inclined portions (2413), 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), and 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 rotor 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 pressing cylinder (257) for driving the support block (252) to press downward, and an avoidance channel that cooperates with the needle body (256) to guide is provided at the center of the sleeve (254), 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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