CN109079306B

CN109079306B - Electrode rotating mechanism for automatic projection welder

Info

Publication number: CN109079306B
Application number: CN201810997170.XA
Authority: CN
Inventors: 朱杰; 戴江平; 欧晓波
Original assignee: Guangzhou Kasima Automotive Systems Co ltd
Current assignee: Guangzhou Kasima Automotive Systems Co ltd
Priority date: 2018-08-29
Filing date: 2018-08-29
Publication date: 2024-03-01
Anticipated expiration: 2038-08-29
Also published as: CN109079306A

Abstract

The invention discloses an electrode rotating mechanism for an automatic projection welding machine, which comprises a rotating assembly, a bottom plate, a first bearing and a second bearing; the rotating assembly comprises a turntable, a connecting piece and a rotating shaft; at least two lower electrode assemblies are arranged on the turntable, and the lower electrode assemblies are used for being matched with the upper electrodes to weld parts; the first bearing and the second bearing are respectively arranged on the bottom plate; the two ends of the rotating shaft are respectively arranged on the first bearing and the second bearing; one side of the turntable is arranged at one end of the rotating shaft through a connecting piece; through setting up two at least bottom electrode assemblies on the carousel, when need carry out projection welding to different parts, only need rotate corresponding bottom electrode assembly to the assigned position, will wait to projection weld the part place on the bottom electrode assembly can, need not dismantle original bottom electrode assembly, install new bottom electrode assembly again, also need not a projection welding machine to correspond a part, great improvement production efficiency, saving cost.

Description

Electrode rotating mechanism for automatic projection welder

Technical Field

The invention relates to the technical field of projection welding machines, in particular to an electrode rotating mechanism for an automatic projection welding machine.

Background

Projection welding, which is a common welding mode in the welding industry, refers to a method of pre-machining one or more raised points on the joint surface of a welding piece, contacting the surface of another welding piece, heating by electrifying, and then collapsing to form welding spots. Projection welding is currently used in the welding industry to weld nuts, studs, washers, and other parts (hereinafter collectively referred to as parts) to larger stamping parts.

The projection welder needs to replace the projection welding electrode and the locating pin corresponding to the welded parts before welding. Only one projection welding electrode and a matched locating pin are arranged on the existing projection welding machine, which means that each part is replaced, the original projection welding electrode and locating pin are required to be detached from the projection welding machine, then the corresponding projection welding electrode is replaced, and the time cost for replacing the projection welding electrode and the locating pin is high; or one part corresponds to one projection welder, meaning that each part corresponds to one projection welder, resulting in higher production costs.

Disclosure of Invention

The invention provides an electrode rotating mechanism for an automatic projection welding machine, which aims to solve the technical problem of low production efficiency caused by the fact that only one lower electrode is arranged on one projection welding machine.

The technical problems of the invention are solved by the following technical scheme:

an electrode rotating mechanism for an automatic projection welding machine comprises a rotating assembly, a bottom plate, a second bearing and a third bearing; the rotating assembly comprises a turntable, a connecting piece and a rotating shaft; at least two lower electrode assemblies are arranged on the turntable and are used for being matched with the upper electrode to weld parts; the second bearing and the third bearing are respectively arranged on the bottom plate; the two ends of the rotating shaft are respectively arranged on the second bearing and the third bearing; one side of the turntable is arranged at one end of the rotating shaft through the connecting piece.

Through set up two at least bottom electrode assemblies on the carousel, when need carry out projection welding to different parts, only need rotate corresponding bottom electrode assembly to the assigned position, will wait to projection weld the part place on the bottom electrode assembly can, need not dismantle original bottom electrode assembly, install new bottom electrode assembly again, also need not a projection welding machine to correspond a part, great improvement production efficiency, saving cost.

In some preferred embodiments, the electrode rotation mechanism further comprises a displacement sensor; the turntable comprises a turntable body; the turntable body is provided with a first channel and a first groove; the first channel is arranged on the side wall of the turntable body and is communicated with the first groove; the lower electrode assembly comprises a locating pin, a lower electrode seat, bakelite, a first oilless bushing, a second oilless bushing, a supporting rod, a spring and a light barrier; a third channel is formed in the lower electrode seat; the lower electrode seat is arranged on the side wall of the turntable body; the third channel is communicated with the first channel; the lower electrode is arranged on the electrode seat; the lower electrode is provided with a second channel which is communicated with the third channel; the support rod is arranged in the first channel and the third channel; one end of the supporting rod is movably arranged in the lower electrode seat through the first oil-free bushing; the other end of the supporting rod is movably arranged in the turntable body through the second oil-free bushing; the spring is sleeved on the supporting rod; one end of the spring is clamped with the supporting rod, and the other end of the spring is abutted with the turntable body; the bakelite is movably arranged in the third channel; the positioning pin is movably arranged in the lower electrode in a penetrating way through the second channel; the upper end of the bakelite is abutted with the lower end of the positioning pin, and the lower end of the bakelite is abutted with the upper end of the supporting rod; the lower end of the supporting rod is connected with a light barrier; the light barrier is positioned in the first groove; the displacement sensor is used for detecting a displacement value of the light barrier along the axial direction of the support rod.

The displacement sensor is arranged to detect the downward movement value of the light barrier due to the different heights of welding feet, flanges and the like of different parts; a locating pin is arranged in the lower electrode, the bakelite is arranged below the locating pin, the supporting rod is arranged below the bakelite, and the supporting rod is connected with a light blocking block; during projection welding, the part is placed on the locating pin, and the part and the locating pin are pressed downwards along with the pressing of the upper electrode until the welding pin of the part contacts the lower electrode to form a loop; because the parts with different soldering leg heights and the parts with different sizes are pressed down, the downward moving distance of the positioning pin is different, and the downward moving value of each part is marked to obtain a marked value; by comparing the distance detected by the displacement sensor with the mark value of the downward movement of the part, whether the part is placed correctly or not can be judged, and the occurrence of the error welding can be prevented.

In some preferred embodiments, the electrode rotation mechanism further comprises a support, a first bracket, a first bearing; the supporting part is arranged on the other side of the turntable; the first bracket is arranged on the projection welding machine; the first bearing is arranged on the first bracket and is used for supporting the supporting part.

The supporting part is arranged on the other side of the turntable and is supported by the first bearing, so that damage to the turntable caused by excessive bearing force can be effectively prevented.

In some preferred embodiments, the electrode rotation mechanism further comprises a support cylinder, a conductive shoe, and a conductive plate; the supporting cylinder is arranged on the bottom plate and used for driving the conductive tile to move up and down; the conductive tile is positioned right above the rotating shaft and is used for conducting electricity; the conductive plate is respectively and electrically connected with the conductive tile and the projection welding machine.

The conductive tile and the conductive plate are arranged, the positioning cylinder drives the conductive tile to move downwards to be abutted against the rotating shaft during projection welding, and the lower electrode assembly and the upper electrode form a loop through the conductive tile, the conductive plate and the rotating assembly to perform projection welding; when the motor component needs to be replaced, the conductive tile is driven to move upwards to be separated from the rotating shaft; the operation is simple and convenient.

In some preferred embodiments, the electrode rotation mechanism further comprises a positioning structure and a positioning cylinder; the positioning structure is arranged on the turntable body; the positioning structure is provided with a positioning hole; the positioning cylinder is arranged on the bottom plate through a second bracket; the positioning cylinder is matched with the positioning hole to limit the rotation of the turntable body.

Through setting up location structure with the location cylinder, works as the carousel body rotates to certain angle, through the location cylinder with location structure cooperation can prevent the carousel body is because of the secondary rotation that external force arouses.

In some preferred embodiments, the positioning cylinder of the electrode rotating mechanism is provided with an in-place sensor, and the in-place sensor is used for detecting whether one end of a push rod in the positioning cylinder reaches into the positioning hole.

And whether the turntable body rotates to a preset position can be effectively judged by arranging a positioning sensor on the positioning cylinder.

In some preferred embodiments, the electrode rotation mechanism further comprises a lower electrode position sensor; the lower electrode position sensor comprises a sensing component and a detector; one end of the induction component is connected with one end of the rotating shaft; the sensing component is provided with a detection sheet; the number of the detection pieces is equal to the number of the lower electrode assemblies; the position of the detection sheet corresponds to the position of the lower electrode assembly; the detector is arranged on the bottom plate and is used for detecting the position of the lower electrode assembly in cooperation with the detection piece.

Through the arrangement, the detection piece corresponds to the position of the electrode assembly, and the detector and the detection piece are matched to determine the position of the detection piece, so that the position of the corresponding motor assembly is judged.

In some preferred embodiments, the electrode rotation mechanism further comprises a moisture separator; the water-gas separator comprises a rotating part and a fixing part; the rotating part is movably arranged in the fixed part; one end of the rotating part is connected with the induction component; one end of the fixing part is arranged on the bottom plate through a third bracket; a first annular channel and a second annular channel are arranged between the rotating part and the fixed part; a fifth water inlet channel and a fifth water outlet channel are axially arranged in the rotating part; the fixed part is provided with a second water inlet joint and a second water outlet joint; the fifth water inlet channel is communicated with the first annular channel; the fifth water outlet channel is communicated with the second annular channel; the second water inlet joint is communicated with the first annular channel; the second water outlet joint is communicated with the second annular channel; a fourth water inlet channel and a fourth water outlet channel are axially arranged in the induction component; a third water inlet channel and a third water outlet channel are axially arranged in the rotating shaft; a second water inlet channel and a second water outlet channel are arranged in the connecting piece; a first water inlet channel and a first water outlet channel are arranged in the turntable body; a first water inlet connector and a first water outlet connector are arranged on the side wall of the turntable body; the lower electrode seat is provided with a first through hole; the first water inlet joint is communicated with the first water outlet joint through a hose after sequentially connecting the first through holes in series through the hose; the first water inlet joint, the first water inlet channel, the second water inlet channel, the third water inlet channel, the fourth water inlet channel and the fifth water inlet channel are sequentially communicated; the first water outlet joint, the first water outlet channel, the second water outlet channel, the third water outlet channel, the fourth water outlet channel and the fifth water outlet channel are sequentially communicated.

Through the arrangement, the electrode seat can be cooled.

In some preferred embodiments, the electrode rotation mechanism further comprises a moisture separator; the water-gas separator comprises a rotating part and a fixing part; the rotating part is movably arranged in the fixed part; one end of the rotating part is connected with the induction component; one end of the fixing part is arranged on the bottom plate through a third bracket; a third annular channel is arranged between the rotating part and the fixed part; a fifth airflow channel is axially arranged in the rotating part; the fixing part is provided with a second ventilation joint; the fifth airflow passage communicates with the third annular passage; the second vent fitting is in communication with the third annular passage; a fourth airflow channel is axially arranged in the induction component; a third airflow channel is axially arranged in the rotating shaft; a second airflow channel is arranged in the connecting piece; a first airflow channel is arranged in the turntable body; a first ventilation joint is arranged on the side wall of the turntable body; the lower electrode seat is provided with a second through hole; the second through hole is communicated with the third channel; the second through holes are respectively communicated with the first ventilation joint through hoses; the first ventilation joint, the first airflow channel, the second airflow channel, the third airflow channel, the fourth airflow channel and the fifth airflow channel are sequentially communicated.

Through the arrangement, when the upper electrode is pressed down to the position that the part is contacted with the lower electrode during projection welding, the second channel in the lower electrode is opened, air flow passes through the third channel and the second channel and blows to the part, dust on the part is cleaned, and the second channel is prevented from being blocked.

In some preferred embodiments, the electrode rotation mechanism further comprises a drive assembly; the driving assembly comprises a gear, a belt and a stepping motor; the gear is arranged on the rotating shaft; the stepping motor is connected with the gear through the belt; the stepping motor drives the rotating shaft through the belt and the gear.

Drawings

FIG. 1 is a schematic view of an electrode rotation mechanism for an automatic projection welder in accordance with one embodiment of the present invention.

Fig. 2 is a schematic view of the structure of the first bearing 2 in the electrode rotating mechanism of fig. 1.

Fig. 3 is a schematic view of the electrode rotation mechanism of fig. 1 with the conductive plate 9 removed.

Fig. 4 is a partial enlarged view of H in the electrode rotating mechanism of fig. 3.

Fig. 5 is a schematic view of the electrode rotation mechanism of fig. 1 with the housing 23 removed.

Fig. 6 is a schematic view of the electrode rotating mechanism of fig. 5 with the positioning cylinder 5 removed.

Fig. 7 is a schematic view of the structure of the rotating assembly of fig. 1.

Fig. 8 is a front view of the swivel assembly of fig. 7.

Fig. 9 is a cross-sectional view of the rotating assembly C-C of fig. 8.

Fig. 10 is a schematic view of the structure of the turntable 4 in the rotating assembly of fig. 7.

Fig. 11 is a front view of the turntable of fig. 10.

Fig. 12 is a sectional view of the rotary table B-B of fig. 11.

Fig. 13 is a side view of the turntable of fig. 10.

Fig. 14 is a sectional view of the turntable D-D of fig. 13.

Fig. 15 is a schematic view of the structure of the turntable body 41 in the turntable of fig. 10.

Fig. 16 is a schematic view of the structure of the lower electrode assembly 42 in the turntable of fig. 10.

Fig. 17 is a schematic exploded view of the structure of the lower electrode assembly 42 of fig. 16.

Fig. 18 is a partial schematic structural view of the lower electrode assembly 42 of fig. 16.

Fig. 19 is a front view of a part of the structure of the lower electrode assembly 42 of fig. 18.

Fig. 20 is a cross-sectional view of a portion of the lower electrode assembly 42 of fig. 19 in the direction of the result I-I.

Fig. 21 is a top view of the lower electrode holder 424 of the lower electrode assembly 42 of fig. 16.

Fig. 22 is a sectional view of the lower electrode holder J-J of fig. 21.

Fig. 23 is a schematic view of the structure of the moisture separator 10 in the turning assembly of fig. 7.

Fig. 24 is a side view of the moisture separator 10 of fig. 23.

FIG. 25 is a sectional view of the water separator D-D of FIG. 24.

Fig. 26 is a schematic view of the structure of the sensing assembly 8 of the rotating assembly of fig. 7.

Fig. 27 is a right side view of the sensing assembly 8 of fig. 26.

Fig. 28 is a left side view of the sensing assembly 8 of fig. 26.

Fig. 29 is a schematic view of the structure of the shaft 18 in the rotating assembly of fig. 7.

Fig. 30 is a left side view of the rotor 18 of fig. 29.

Fig. 31 is a right side view of the rotor 18 of fig. 29.

Fig. 32 is a schematic view of the structure of the connector 16 of fig. 7.

Fig. 33 is a front view of the connector 16 of fig. 32.

Fig. 34 is a rear view of the connector 16 of fig. 32.

Fig. 35 is a cross-sectional view of the connector 16E-E of fig. 34.

Fig. 36 is a side view of the connector 16 of fig. 32.

Fig. 37 is a cross-sectional view of the connector 16F-F of fig. 36.

Fig. 38 is a schematic view of the structure of the positioning cylinder 5 in fig. 1.

Fig. 39 is a top view of the positioning cylinder 5 in fig. 38.

1, a first bracket; 2. a first bearing; 201. a bearing support; 202. a first roller; 203. a second roller; 3. a displacement sensor; 4. a turntable; 41. a turntable body; 411. a first water inlet channel; 412. a first water inlet joint; 413. a first water outlet channel; 414. a first water outlet joint; 415. a first airflow passage; 416. a first vent fitting; 417. a first channel; 418. a first groove; 42. a lower electrode assembly; 421. a positioning pin; 4211. a first sealing part; 422. a lower electrode; 4221. a second channel; 423. electric wood; 424. a lower electrode base; 4241. a first through hole; 4242. a second through hole; 4243. a third channel; 425. a first oil-free bushing; 426. a spring; 427. a support rod; 428. a second oil-free bushing; 429. a light barrier; 43. a hose; 44. a positioning structure; 5. positioning a cylinder; 501. a second bracket; 502. an in-place sensor; 6. a conductive tile; 7. a gear; 8. an induction assembly; 801. a fourth water inlet passage; 802. a fourth water outlet passage; 803. a fourth airflow passage; 804. a detection sheet; 9. a conductive plate; 10. a water-gas separator; 1001. a fifth water inlet passage; 1002. a fifth water outlet passage; 1003. a fifth airflow passage; 1004. a rotating part; 1005. a fixing part; 1006. a second water inlet joint; 1007. a second water outlet joint; 1008. a second vent fitting; 1009. a first annular channel; 10010. a second annular channel; 10011. a third annular channel; 11. a flexible conductor; 12. a third bracket; 13. a detector; 14. a bottom plate; 15. a support cylinder; 16. a connecting piece; 1601. a second water inlet channel; 1602. a second water outlet channel; 1603. a second airflow passage; 17. a second bearing; 18. a rotating shaft; 1801. a third water inlet channel; 1802. a third water outlet channel; 1803. a third air flow passage; 19. a third bearing; 20. a belt; 21. a stepping motor; 22. a support part; 23. a housing.

Detailed Description

The invention will be further described with reference to the following drawings in conjunction with the preferred embodiments.

Referring to fig. 1-39, the electrode rotation mechanism for an automatic projection welder in this embodiment includes a rotating assembly, a base plate, a second bearing 17, and a third bearing 19; the rotating assembly comprises a turntable 4, a connecting piece 16 and a rotating shaft 18; at least two lower electrode assemblies 42 are arranged on the turntable 4, and the lower electrode assemblies 42 are used for being matched with upper electrodes to weld parts; the second bearing 17 and the third bearing 19 are respectively arranged on the bottom plate 14; both ends of the rotating shaft 18 are respectively arranged on the second bearing 17 and the third bearing 19; one side of the turntable 4 is mounted at one end of the rotating shaft 18 through the connecting piece 16.

The electrode rotating mechanism is also provided with a displacement sensor 3; the displacement sensor is a high-precision laser sensor; the turntable 4 comprises a turntable body 41; the turntable body 41 is provided with a first channel 417 and a first groove 418; the first channel 417 is disposed on a sidewall of the turntable body 41 and communicates with the first groove 418; the lower electrode assembly 42 includes a positioning pin 421, a lower electrode 422, a lower electrode holder 424, a bakelite 423, a first oilless bushing 425, a second oilless bushing 428, a support rod 427, a spring 426, and a light barrier 429; the lower electrode base 424 is provided with a third channel 4243; the lower electrode holder 424 is mounted on the sidewall of the turntable body 41; the third passage 4243 communicates with the first passage 417; the lower electrode 422 is disposed on the lower electrode holder 424; the lower electrode 422 is provided with a second channel 4221, which is communicated with the third channel 4243; the support bar 427 is disposed within the first passage 417 and the third passage 4243; one end of the supporting rod 427 is movably installed in the lower electrode holder 424 through the first oil-free bushing 425; the lower end of the third passage 4243 is sealed by the first oil free bushing 425 and the support rod 427; the other end of the supporting rod 427 is movably installed in the turntable body 41 through the second oilless bushing 428; the spring 426 is sleeved on the supporting rod 427; one end of the spring 426 is clamped with the support rod 427, and the other end is abutted with the turntable body 41; the bakelite 423 is movably arranged in the third channel 4243; the positioning pin 421 is movably inserted into the lower electrode 422 through the second passage 4221; the upper end of the bakelite 423 is abutted against the lower end of the positioning pin 421, and the lower end of the bakelite 423 is abutted against the upper end of the supporting rod 427; the lower end of the supporting rod 427 is connected with a light barrier 429; the light barrier 429 is positioned within the first recess 428; the displacement sensor 3 is configured to detect a displacement value of the light barrier 429 along the axial direction of the support rod 427; when the upper electrode is pressed down, the positioning pin 421 is pressed down, and the supporting rod 427 is pushed down by the bakelite 423, so as to drive the light barrier 429 to move down; a lower cone of the positioning pin 421; the lower part of the second channel 4221 in the lower electrode 422 is cone-shaped, and the lower part of the positioning pin 421 is matched with the lower part of the second channel 4221 to seal or open the second channel 4221; when the positioning pin 421 is pressed down, the second passage 4221 is opened; when the positioning pin 421 is not displaced, the positioning pin 421 cooperates with the lower electrode 422 to seal the second passage 4221.

The electrode rotating mechanism is also provided with a supporting part 22, a first bracket 1 and a first bearing 2; the supporting part 22 is arranged on the other side of the turntable 4; the first bracket 1 is arranged on a projection welding machine; the first bearing 2 is disposed on the first bracket 1, and is used for supporting the supporting portion 22; the first bearing 2 comprises a bearing bracket 201, a first roller 202 and a second roller 203; the first roller 202 and the second roller 203 are movably arranged on the bearing bracket 201 side by side; the support 22 is disposed on the first roller 202 and the second roller 203 and is located between the first roller 202 and the second roller 203.

The electrode rotating mechanism is also provided with a supporting cylinder 15, a conductive tile 6 and a conductive plate 9; the supporting cylinder 15 is arranged on the bottom plate 14 and is used for driving the conductive tile 6 to move up and down; the conductive tile 6 is located right above the rotating shaft 18 and is used for conducting electricity; the conductive plate 9 is electrically connected with the conductive tile 6 and the projection welding machine respectively.

The electrode rotating mechanism is also provided with a positioning structure 44 and a positioning cylinder 5; the positioning structure 44 is arranged on the turntable body 41; the positioning structure 44 is provided with a positioning hole; the positioning cylinder 5 is arranged on the bottom plate through a second bracket 501; the positioning cylinder 5 cooperates with the positioning hole to limit the rotation of the turntable body 41.

The electrode rotating mechanism is also provided with an in-place sensor 502 arranged on the positioning cylinder 5, and the in-place sensor 502 is used for detecting whether one end of a push rod in the positioning cylinder 5 reaches the positioning hole; when the positioning rod in the positioning cylinder 5 moves into the positioning hole, the lamp on the in-place sensor 502 is turned on.

The electrode rotating mechanism is also provided with a lower electrode position sensor; the lower electrode position sensor comprises a sensing component 8 and a detector 13; one end of the induction component 8 is connected with one end of the rotating shaft 18; a detecting piece 804 is arranged on the sensing component 8; the number of the detection pieces 804 is equal to the number of the lower electrode assemblies 42; the position of the detection piece 804 corresponds to the position of the lower electrode assembly 42; the detector 13 is arranged on the bottom plate 14 and is used for detecting the position of the lower electrode assembly 42 in cooperation with the detection piece 804; the detector 13 is an inductive sensor.

The electrode rotating mechanism is also provided with a water-gas separator 10; the water-gas separator 10 includes a rotating portion 1004 and a fixing portion 1005; the rotating part 1004 is movably arranged in the fixed part 1005; one end of the rotating part 1004 is connected with the induction component 8; one end of the fixing part 1005 is mounted on the bottom plate 14 through a third bracket 12; a first annular channel 1009 and a second annular channel 10010 are arranged between the rotating part 1004 and the fixed part 1005; a fifth water inlet channel 1001 and a fifth water outlet channel 1002 are axially arranged in the rotating part 1004; the fixed part is provided with a second water inlet joint 1006 and a second water outlet joint 1007; the fifth water inlet passage 1001 communicates with the first annular passage 1009; the fifth water outlet passage 1002 communicates with the second annular passage 10010; the second water inlet joint 1006 communicates with the first annular passage 1009; the second outlet fitting 1007 communicates with the second annular channel 10010; a fourth water inlet channel 801 and a fourth water outlet channel 802 are axially arranged in the induction component 8; a third water inlet channel 1801 and a third water outlet channel 1802 are axially arranged in the rotating shaft 18; a second water inlet channel 1601 and a second water outlet channel 1602 are arranged in the connecting piece 16; a first water inlet channel 411 and a first water outlet channel 413 are arranged in the turntable body 41; a first water inlet joint 412 and a first water outlet joint 414 are arranged on the side wall of the turntable body 41; the lower electrode base 424 is provided with a first through hole 4242; the first water inlet joint 412 is connected in series with the first through hole 4242 through the hose 43 in sequence, and then is communicated with the first water outlet joint 414 through the hose 43; the first water inlet joint 412, the first water inlet channel 411, the second water inlet channel 1601, the third water inlet channel 1801, the fourth water inlet channel 801 and the fifth water inlet channel 1001 are sequentially communicated; the first water outlet joint 414, the first water outlet passage 413, the second water outlet passage 1602, the third water outlet passage 1802, the fourth water outlet passage 802, and the fifth water outlet passage 1002 are sequentially communicated; a third annular channel 10011 is arranged between the rotating part 1004 and the fixed part 1005; a fifth air flow passage 1003 is provided in the rotating portion 1004 in the axial direction; the fixing portion 1005 is provided with a second vent connector 1008; the fifth flow passage 1003 communicates with the third annular passage 10011; the second vent fitting 1008 communicates with the third annular passage 10011; a fourth air flow channel 803 is axially arranged in the induction component 8; a third air flow channel 1803 is axially arranged in the rotating shaft 18; a second air flow channel 1603 is provided within the connector 16; a first airflow passage 415 is arranged in the turntable body 41; a first ventilation joint 416 is arranged on the side wall of the turntable body 41; the lower electrode base 424 is provided with a second through hole 4241; the second through hole 4241 communicates with the third channel 4243; the second through holes 4241 are respectively communicated with the first ventilation joint 416 through a hose 43; the first ventilation joint 416, the first airflow channel 415, the second airflow channel 1603, the third airflow channel 1803, the fourth airflow channel 803, and the fifth airflow channel 1003 are sequentially communicated.

The electrode rotating mechanism is also provided with a driving component; the drive assembly comprises a gear 7, a belt 20 and a stepper motor 21; the gear 7 is arranged on the rotating shaft 18; the stepper motor 21 is connected with the gear 7 through the belt 20; the stepping motor 21 drives the rotating shaft 18 through the belt 20 and the gear 7.

The working process of the electrode rotating mechanism in the embodiment is as follows:

after the welding is started, the transfer robot grabs the projection welded part to the position to be projection welded and sends a signal to a projection welding machine, at the moment, the supporting cylinder 15 drives the conductive tile 6 to be separated from the rotating shaft 18, the positioning rod of the positioning cylinder 5 stretches back, the electrode rotating mechanism rotates the rotary table 4 to an electrode angle to be used through the combination of the lower electrode position sensor and the setting of a program, and after the lower electrode position sensor is lightened, the supporting cylinder 15 drives the conductive tile 6 to be locked with the rotating shaft 18, and the positioning rod of the positioning cylinder 5 stretches out and is inserted into a positioning hole on the positioning structure 44; the transfer robot transfers the part projection welding position to the positioning pin 421; the upper electrode is pressed down to form a loop, the displacement sensor 502 detects the displacement of the positioning rod in the positioning cylinder 5, and when the detection value is within the set value range, the welding is started; after the welding is finished, the upper electrode returns, the transfer robot transfers the part to the area to be welded, the positioning rod of the positioning cylinder 5 stretches back, the supporting cylinder 15 drives the conductive tile 6 to lift, the servo motor 21 drives the rotator to rotate to the position of the lower electrode base 424, the conductive tile 6 reclock the rotating shaft 18, and the positioning rod stretches out to start the next welding cycle.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several equivalent substitutions and obvious modifications can be made without departing from the spirit of the invention, and the same should be considered to be within the scope of the invention.

Claims

1. An electrode rotating mechanism for an automatic projection welding machine is characterized by comprising a rotating assembly, a bottom plate, a second bearing and a third bearing; the rotating assembly comprises a turntable, a connecting piece and a rotating shaft; at least two lower electrode assemblies are arranged on the turntable and are used for being matched with the upper electrode to weld parts; the second bearing and the third bearing are respectively arranged on the bottom plate; the two ends of the rotating shaft are respectively arranged on the second bearing and the third bearing; one side of the turntable is arranged at one end of the rotating shaft through the connecting piece and also comprises a displacement sensor; the turntable comprises a turntable body; the turntable body is provided with a first channel and a first groove; the first channel is arranged on the side wall of the turntable body and is communicated with the first groove; the lower electrode assembly comprises a locating pin, a lower electrode seat, bakelite, a first oilless bushing, a second oilless bushing, a supporting rod, a spring and a light barrier; a third channel is formed in the lower electrode seat; the lower electrode seat is arranged on the side wall of the turntable body; the third channel is communicated with the first channel; the lower electrode is arranged on the lower electrode seat; the lower electrode is provided with a second channel which is communicated with the third channel; the support rod is arranged in the first channel and the third channel; one end of the supporting rod is movably arranged in the lower electrode seat through the first oil-free bushing; the other end of the supporting rod is movably arranged in the turntable body through the second oil-free bushing; the spring is sleeved on the supporting rod; one end of the spring is clamped with the supporting rod, and the other end of the spring is abutted with the turntable body; the bakelite is movably arranged in the third channel; the positioning pin is movably arranged in the lower electrode in a penetrating way through the second channel; the upper end of the bakelite is abutted with the lower end of the positioning pin, and the lower end of the bakelite is abutted with the upper end of the supporting rod; the lower end of the supporting rod is connected with a light barrier; the light barrier is positioned in the first groove; the displacement sensor is used for detecting a displacement value of the light barrier along the axial direction of the support rod.

2. The electrode rotation mechanism for an automatic projection welder as claimed in claim 1, further comprising a support, a first bracket, a first bearing; the supporting part is arranged on the other side of the turntable; the first bracket is arranged on the projection welding machine; the first bearing is arranged on the first bracket and is used for supporting the supporting part.

3. The electrode rotation mechanism for an automatic projection welder as claimed in claim 1, further comprising a support cylinder, a conductive shoe, and a conductive plate; the supporting cylinder is arranged on the bottom plate and used for driving the conductive tile to move up and down; the conductive tile is positioned right above the rotating shaft and is used for conducting electricity; the conductive plate is respectively and electrically connected with the conductive tile and the projection welding machine.

4. The electrode rotation mechanism for an automatic projection welder as claimed in claim 1, further comprising a positioning structure and a positioning cylinder; the positioning structure is arranged on the turntable body; the positioning structure is provided with a positioning hole; the positioning cylinder is arranged on the bottom plate through a second bracket; the positioning cylinder is matched with the positioning hole to limit the rotation of the turntable body.

5. The electrode rotating mechanism for an automatic projection welding machine as claimed in claim 4, wherein an in-place sensor is provided on the positioning cylinder, and the in-place sensor is used for detecting whether one end of a push rod in the positioning cylinder reaches into the positioning hole.

6. The electrode rotation mechanism for an automatic projection welder as claimed in claim 1, further comprising a lower electrode position sensor; the lower electrode position sensor comprises a sensing component and a detector; one end of the induction component is connected with one end of the rotating shaft; the sensing component is provided with a detection sheet; the number of the detection pieces is equal to the number of the lower electrode assemblies; the position of the detection sheet corresponds to the position of the lower electrode assembly; the detector is arranged on the bottom plate and is used for detecting the position of the lower electrode assembly in cooperation with the detection piece.

7. The electrode rotation mechanism for an automatic projection welder as claimed in claim 6, further comprising a moisture separator; the water-gas separator comprises a rotating part and a fixing part; the rotating part is movably arranged in the fixed part; one end of the rotating part is connected with the induction component; one end of the fixing part is arranged on the bottom plate through a third bracket; a first annular channel and a second annular channel are arranged between the rotating part and the fixed part; a fifth water inlet channel and a fifth water outlet channel are axially arranged in the rotating part; the fixed part is provided with a second water inlet joint and a second water outlet joint; the fifth water inlet channel is communicated with the first annular channel; the fifth water outlet channel is communicated with the second annular channel; the second water inlet joint is communicated with the first annular channel; the second water outlet joint is communicated with the second annular channel; a fourth water inlet channel and a fourth water outlet channel are axially arranged in the induction component; a third water inlet channel and a third water outlet channel are axially arranged in the rotating shaft; a second water inlet channel and a second water outlet channel are arranged in the connecting piece; a first water inlet channel and a first water outlet channel are arranged in the turntable body; a first water inlet connector and a first water outlet connector are arranged on the side wall of the turntable body; the lower electrode seat is provided with a first through hole; the first water inlet joint is communicated with the first water outlet joint through a hose after sequentially connecting the first through holes in series through the hose; the first water inlet joint, the first water inlet channel, the second water inlet channel, the third water inlet channel, the fourth water inlet channel and the fifth water inlet channel are sequentially communicated; the first water outlet joint, the first water outlet channel, the second water outlet channel, the third water outlet channel, the fourth water outlet channel and the fifth water outlet channel are sequentially communicated.

8. The electrode rotation mechanism for an automatic projection welder as claimed in claim 6, further comprising a moisture separator; the water-gas separator comprises a rotating part and a fixing part; the rotating part is movably arranged in the fixed part; one end of the rotating part is connected with the induction component; one end of the fixing part is arranged on the bottom plate through a third bracket; a third annular channel is arranged between the rotating part and the fixed part; a fifth airflow channel is axially arranged in the rotating part; the fixing part is provided with a second ventilation joint; the fifth airflow passage communicates with the third annular passage; the second vent fitting is in communication with the third annular passage; a fourth airflow channel is axially arranged in the induction component; a third airflow channel is axially arranged in the rotating shaft; a second airflow channel is arranged in the connecting piece; a first airflow channel is arranged in the turntable body; a first ventilation joint is arranged on the side wall of the turntable body; the lower electrode seat is provided with a second through hole; the second through hole is communicated with the third channel; the second through holes are respectively communicated with the first ventilation joint through hoses; the first ventilation joint, the first airflow channel, the second airflow channel, the third airflow channel, the fourth airflow channel and the fifth airflow channel are sequentially communicated.

9. The electrode rotation mechanism for an automatic projection welder of claim 1, further comprising a drive assembly; the driving assembly comprises a gear, a belt and a stepping motor; the gear is arranged on the rotating shaft; the stepping motor is connected with the gear through the belt; the stepping motor drives the rotating shaft through the belt and the gear.