CN115430958A

CN115430958A - Rotary welding machine

Info

Publication number: CN115430958A
Application number: CN202211081254.1A
Authority: CN
Inventors: 朱效铭; 陈石朱; 王进台
Original assignee: Ningbo Jiuju Intelligent Equipment Co ltd
Current assignee: Ningbo Jiuju Intelligent Equipment Co ltd
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2022-12-06

Abstract

The invention discloses a rotary welding machine, which comprises a base, a feeding mechanism, a discharging mechanism and the like, and further comprises a working turntable, a positioning groove, a pair of positioning wheels, a lifting mechanism, a pressing wheel auxiliary mechanism, a driving wheel, a welding head and the like; therefore, when the working turntable rotates intermittently to drive the outer circumferential surface of the battery in the positioning groove to contact the driving wheel, the lifting mechanism is also driven to lift and push the battery, the bottom end of the battery forms a rotating support, the top end of the battery is matched with any one positioning wheel by the pressing wheel auxiliary mechanism to form a pressing, positioning and rotating support, and at the moment, the circumferential welding of the current collecting ring can be carried out on the end part of the battery by the welding head only after the driving wheel drives the battery to rotate. Therefore, the welding mode of carrying out rotary battery conveying through the intermittent rotation of the working turntable, positioning the battery and driving the battery to rotate to realize the circumferential welding of the current collecting ring has the use advantages of high production efficiency, small occupied space, reliable welding quality and the like.

Description

Rotary welding machine

Technical Field

The invention relates to a welding machine for welding a current collecting ring at the end part of a battery, in particular to a rotary welding machine.

Background

At present, the end part of a battery needs to be welded with a current collecting ring, the traditional welding mode mainly adopts spot welding, namely a feeding mechanism conveys the battery to a welding machine in sequence, then a plurality of welding machines are matched with a plurality of stations to carry out spot welding one by one, and finally a discharging mechanism outputs the welded battery in sequence, the spot welding mode has low production efficiency, the reliability of the end part structure is difficult to ensure, and the leakage of the end part of the battery is easy to occur in the later use process; meanwhile, the process of sequentially conveying the batteries to the welding machine mainly adopts a circulating conveying chain structure, although the structure also realizes the automation of welding, the conveying chain needs to keep a certain conveying length, namely, the whole production line has large volume, so that a large space occupation can be caused to a limited production workshop; in addition, with the increase of the application range of the lithium battery, battery manufacturers are urgently required to provide more welding machines with different structures and working modes in the market so as to meet the welding requirement of the current collecting ring on the end part of the battery.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a rotary welding machine with high production efficiency, small occupied space and reliable welding quality.

The technical problem of the invention is realized by the following technical scheme:

a rotary welding machine is mainly used for welding a current collecting ring at the end part of a battery and comprises a base, a feeding mechanism and a discharging mechanism, wherein the feeding mechanism and the discharging mechanism are installed on the base; the working turntable is provided with a pair of positioning wheels adjacent to each positioning groove, the positioning wheels are simultaneously contacted with the outer circumferential surface of a battery in the positioning groove to form positioning, a pinch roller auxiliary mechanism is arranged above the battery in each positioning groove, a lifting mechanism is arranged below the battery in each positioning groove, the lifting mechanism forms lifting movement along with the intermittent rotation of the working turntable, and a driving wheel and a welding head are arranged beside one or more positioning grooves; the intermittent rotation of the working turntable drives the outer circumferential surface of the battery in the positioning groove to contact with the driving wheel, and simultaneously drives the lifting mechanism to lift and push the battery, so that the bottom end of the battery forms a rotating support and the top end of the battery is matched with any one positioning wheel by the pinch roller auxiliary mechanism to form a pressing, positioning and rotating support, and after the driving wheel drives the battery to rotate, the welding head performs circumferential welding on the end part of the battery with the current collecting ring.

The pressing wheel auxiliary mechanism comprises a pressing wheel and a pressing wheel cylinder for driving the pressing wheel to move in and out in a reciprocating manner; the lifting mechanism ascends to push the top end of the battery to be close to the pinch roller auxiliary mechanism, the pinch roller is driven by the pinch roller cylinder to move outwards and is matched with any one positioning wheel to push the outer circumferential surface of the current collecting ring to contact the inner circumferential surface of the end part of the battery to form a pressing, positioning and rotating support; the pressing wheel is driven by the pressing wheel cylinder to move inwards to be disengaged from any positioning wheel, and the lifting mechanism descends to drive the top end of the battery to be far away from the pressing wheel auxiliary mechanism.

The lifting mechanism comprises a driving disc, a fixed disc and a plurality of lifting rods which are arranged on the outer circumference of the driving disc in a lifting sliding manner, the driving disc and the working turntable form a coaxial rotating installation, the fixed disc is fixed relative to the working turntable, and an elliptic sliding groove is arranged on the outer circumferential surface of the fixed disc in a circumferential surrounding manner; the plurality of lifting rods and the plurality of positioning grooves on the outer circumference of the working turntable are equal in quantity and consistent in position, the bottom end of each lifting rod is provided with a pulley which is assembled in the sliding groove in a rolling manner, and the top end of each lifting rod is provided with a supporting and positioning rotary seat; the driving disc and the working turntable coaxially rotate, and the pulley at the bottom end of each lifting rod rolls along the sliding groove, so that each lifting rod is driven to move up and down on the outer circumferential surface of the driving disc; the lifting rod rises to drive the supporting and positioning rotating seat to push the bottom end of the battery, and the bottom end of the battery forms a positioning and rotating support.

The periphery of the working turntable is provided with a surrounding working arc edge, and a working channel is formed between the plurality of positioning grooves and the working arc edge.

The feed mechanism include the feeding carousel, this feeding carousel's outer circumference is equipped with a plurality of feed chutes, homoenergetic location or break away from the battery in every feed chute, a plurality of feed chutes with enclose and close and form feedstock channel between feeding carousel outlying feeding arc limit, this feedstock channel's initiating terminal is equipped with the feed inlet, feedstock channel's termination end forms the intercommunication with working channel's initiating terminal and links up.

Discharge mechanism include ejection of compact carousel, this ejection of compact carousel's outer circumference is equipped with a plurality of blown down tanks, homoenergetic location or break away from the battery in every blown down tank, a plurality of blown down tanks with enclose and close and form discharging channel between ejection of compact carousel outlying discharge arc limit, this discharging channel's initiating terminal forms the intercommunication with working channel's termination end and links up, discharging channel's termination end is equipped with the discharge gate.

The feeding turntable, the working turntable and the discharging turntable sequentially form intermittent linkage rotation in tangent connection.

The feeding turntable is arranged on the feeding shaft, the working turntable is arranged on the main shaft, the discharging turntable is arranged on the discharging shaft, the feeding shaft, the main shaft and the discharging shaft are vertically and rotatably arranged on the base, and the transmission gear sets are arranged between the main shaft and the feeding shaft and between the main shaft and the discharging shaft.

A driving motor is arranged in the base and connected with the main shaft to form intermittent rotation driving; the driving wheel is driven by a driving motor to rotate.

The feeding hole, the feeding arc edge, the working arc edge, the discharging arc edge and the discharging hole are all formed by baffles arranged on the base.

Compared with the prior art, the invention is mainly characterized in that a base is provided with a working turntable which is intermittently and rotatably installed, the working turntable is respectively connected with a feeding mechanism and a discharging mechanism, the outer circumference of the working turntable is provided with a plurality of positioning grooves, a battery can be positioned or separated in each positioning groove, a pair of positioning wheels adjacent to each positioning groove are arranged on the working turntable, the pair of positioning wheels simultaneously contact the outer circumferential surface of the battery in the positioning groove to form positioning, a pressing wheel auxiliary mechanism is arranged above the battery in each positioning groove, a lifting mechanism is arranged below the battery in each positioning groove, the lifting mechanism can form lifting movement along with the intermittent rotation of the working turntable, and a driving wheel and a welding head are arranged beside one or more positioning grooves; therefore, when the working turntable rotates intermittently to drive the outer circumferential surface of the battery in the positioning groove to contact the driving wheel, the lifting mechanism is also driven to lift and push the battery, the bottom end of the battery forms a rotating support, the top end of the battery is matched with any one positioning wheel by the pressing wheel auxiliary mechanism to form a pressing, positioning and rotating support, and at the moment, the circumferential welding of the current collecting ring can be carried out on the end part of the battery by the welding head only after the driving wheel drives the battery to rotate. Therefore, the welding mode of carrying out rotary battery conveying through the intermittent rotation of the working turntable, positioning the battery and driving the battery to rotate to realize the circumferential welding of the current collecting ring has the use advantages of high production efficiency, small occupied space, reliable welding quality and the like.

Drawings

FIG. 1 is a top view of the present invention.

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is an enlarged view of fig. 1 at B.

Fig. 4 is an enlarged view of fig. 2 at C.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the above drawings.

As shown in the figures 1-4, the device comprises a base, a main shaft 11, a feeding shaft 12, a discharging shaft 13, a discharging shaft 14, a bottom plate 15, a supporting rod 16, a top plate 17, a shaft sleeve 18, a driving motor 19, a transmission gear set 21, a working turntable 22, a positioning groove 23, a positioning wheel 24, a pressing wheel auxiliary mechanism 241, a pressing wheel 242, a pressing wheel cylinder 3, a feeding mechanism 31, a feeding turntable 32, a feeding groove 32, a discharging mechanism 4, a discharging turntable 41, a discharging groove 42, a driving wheel 5, a driving motor 51, a welding head 6, a baffle 7, a feeding port 71, a feeding arc 72, a feeding arc 73, a feeding channel 74, a working arc 75, a discharging arc 76, a discharging channel 77, a discharging port 78, a discharging port 8, a lifting mechanism 81, a lifting rod 82, a supporting and positioning rotary seat 83, a pulley, a driving disk 84, a linear guide rail 841, a fixing disk 85, a 851 chute 9, a battery 91 and a collecting ring.

The rotary welding machine, as shown in fig. 1 and 2, is mainly used for circumferential welding of a current collecting ring 91 at the end of a battery 9, and structurally comprises a base 1, a working turntable 21, a feeding mechanism 3, a discharging mechanism 4 and the like, wherein the working turntable 21 is installed on the base and is respectively connected with the feeding mechanism 3 and the discharging mechanism 4.

Wherein, the base 1 is a frame structure formed by a bottom plate 14, a top plate 16 and a support rod 15 which is connected and fixed between the bottom plate and the top plate; a plurality of positioning grooves 22 which are uniformly distributed on the circumference are formed in the outer circumference of the working turntable 21, and each positioning groove can be used for positioning or separating the battery 9; the feeding mechanism 3 comprises a feeding turntable 31, the outer circumference of the feeding turntable is provided with a plurality of feeding grooves 32 which are uniformly distributed on the circumference, and each feeding groove can be positioned or separated from the battery 9; the discharging mechanism 4 comprises a discharging turntable 41, the outer circumference of the discharging turntable is provided with a plurality of discharging grooves 42 which are uniformly distributed on the circumference, and each discharging groove can be positioned or separated from the battery 9.

A feeding shaft 12, a main shaft 11 and a discharging shaft 13 which are vertically and rotatably arranged are arranged on the base 1 and actually on the top plate 16, and particularly, the feeding shaft 12, the main shaft 11 and the discharging shaft 13 are rotatably arranged in a shaft sleeve 17 through bearings, and the shaft sleeve is fixed on the top plate 16; 11 tops of main shaft pass the fixed work carousel 21 in axle sleeve 17 top, the fixed feeding carousel 31 in axle sleeve 17 top is passed on 12 tops of feeding axle, the fixed ejection of compact carousel 41 in axle sleeve 17 top is passed on 13 tops of ejection of compact axle, and 11 bottoms of main shaft, 12 bottoms of feeding axle and ejection of compact axle 13 bottoms also all pass axle sleeve 17 bottom, and between 11 bottoms of main shaft and the 12 bottoms of feeding axle, all be equipped with transmission gear group 19 between 11 bottoms of main shaft and the 13 bottoms of ejection of compact axle.

And, feeding carousel 31, work carousel 21 and ejection of compact carousel 41 form tangent intermittent type formula linkage rotation that links up in proper order, specifically be equipped with driving motor 18 in base 1, this driving motor connects main shaft 11 back, can drive the main shaft and form intermittent type formula rotation, and then realized feeding shaft 12 and ejection of compact axle 13 synchronous intermittent type formula linkage rotation, that is to say feeding carousel 31, work carousel 21 and ejection of compact carousel 41 have formed synchronous intermittent type formula linkage rotation.

Meanwhile, the periphery of the working turntable 21 is provided with a surrounding working arc edge 74, and a working channel 75 is just formed between the plurality of positioning grooves 22 and the working arc edge 74; a surrounding feeding arc edge 72 is arranged on the periphery of the feeding turntable 31, a feeding channel 73 is just formed between the plurality of feeding grooves 32 and the feeding arc edge 72, a feeding hole 71 is arranged at the initial end of the feeding channel, and the terminating end of the feeding channel 73 is communicated and connected with the initial end of the working channel 75; the periphery of ejection of compact carousel 41 is equipped with the ejection of compact arc limit 76 that encloses and close, has just in time formed discharging channel 77 between a plurality of blown down tanks 42 and the ejection of compact arc limit 76, and this discharging channel's initiating terminal forms the intercommunication with working channel 75's termination end and links up, and discharging channel 77's termination end is equipped with discharge gate 78.

Therefore, the feeding port 71, the feeding channel 73, the working channel 75, the discharging channel 77 and the discharging port 78 form a complete rotary welding production line channel which can be used for welding the current collecting ring 91 at the end part of the battery 9, and the feeding port 71, the feeding arc edge 72, the working arc edge 74, the discharging arc edge 76 and the discharging port 78 are formed by splicing a plurality of baffle plates 7 arranged on the base 1.

The working turntable 21 is provided with a pair of positioning wheels 23 adjacent to each positioning groove 22, the pair of positioning wheels can be simultaneously contacted with the outer circumferential surface of the battery 9 in the positioning groove 22 to form positioning, a pinch roller auxiliary mechanism 24 is arranged above the battery 9 in each positioning groove 22, and a lifting mechanism 8 is arranged below the battery 9, and the lifting mechanism can form lifting movement along with the intermittent rotation of the working turntable 21.

The lifting mechanism 8 comprises a driving disc 84, a fixed disc 85 and a plurality of lifting rods 81 which are uniformly distributed on the outer circumference of the driving disc; the driving disk 84 and the working turntable 21 are coaxially and rotatably mounted, that is, the spindle 11 can synchronously drive the working turntable 21 and the driving disk 84 to intermittently rotate, and the fixed disk 85 is arranged on the shaft sleeve 17 outside the spindle 11, so that the fixed disk 85 is stationary relative to the working turntable 21, and the outer circumferential surface of the fixed disk 85 is provided with a chute 851 with an elliptical circumferential shape.

The number of the lifting rods 81 is the same as the number of the positioning grooves 22 on the outer circumference of the working turntable 21, and each lifting rod 81 is arranged in a sliding manner through the linear guide 841 on the outer circumference of the driving disc 84, namely, the lifting rods move up and down relative to the driving disc 84 through the sliding of the linear guide 841; moreover, the bottom end of each lifting rod 81 is provided with a pulley 83 which is assembled in the chute 851 in a rolling manner, and the top end of each lifting rod 81 is provided with a supporting and positioning rotating seat 82.

Therefore, when the driving disc 84 and the working turntable 21 rotate coaxially, the pulley 83 at the bottom end of each lifting rod 81 can roll along the sliding slot 851, and due to the special elliptical structure of the sliding slot, when the pulley 83 rolls along the sliding slot 851, each lifting rod 81 is driven to move up and down along the linear guide 841 on the outer circumferential surface of the driving disc 84, and the lifting rod 81 drives the supporting and positioning rotating seat 82 to push the bottom end of the battery 9 and form a positioning and rotating support for the bottom end of the battery.

Certainly, the top end of the battery 9 will rise along with the battery pushed by the rising of the lifting rod 81 to approach the pressing wheel auxiliary mechanism 24, and will be pressed, held, positioned and rotated and supported by the pressing wheel auxiliary mechanism 24 in cooperation with any one positioning wheel 23, and the specific structure is as follows: the pressing wheel auxiliary mechanism 24 comprises a pair of pressing wheels 241 and a pressing wheel cylinder 242 for driving the pair of pressing wheels to synchronously reciprocate inwards and outwards, when the lifting mechanism 8 ascends to push the top end of the battery 9 to be close to the pressing wheel auxiliary mechanism 24, the pair of pressing wheels 241 are driven by the pressing wheel cylinder 242 to move outwards at the same time, namely, the pair of pressing wheels 241 move outwards from the original middle position of the battery to be close to the side position of the battery at the same time, and then the pressing wheels are matched with any positioning wheel 23 to push the outer circumferential surface of the current collecting ring 91 to contact the inner circumferential surface of the end part of the battery 9 to form close contact, so that a pressing, positioning and rotating support is formed between the pressing, positioning and rotating support, and the bottom end and the top end of the battery 9 are positioned and supported to rotate at the same time.

The pair of pressing wheels 241 are driven by the pressing wheel cylinder 242 to move inwards at the same time, that is, the pair of pressing wheels 241 move inwards from the original battery side positions to be close to the middle position of the battery and are disengaged from any one positioning wheel 23, the lifting mechanism 8 descends to drive the top end of the battery 9 to be far away from the pressing wheel auxiliary mechanism 24, and the action process generally refers to the output action of the current collecting ring 91 after the circumferential welding is completed at the end part of the battery 9.

In addition, a driving wheel 5 and a welding head 6 are arranged beside one or more positioning grooves 22, in this embodiment, the driving wheel 5 and the welding head 6 are arranged beside one positioning groove 22 close to the discharging mechanism 4, that is, the driving wheel 5 and the welding head 6 are arranged beside one positioning groove 22 close to the terminating end of the working channel 75, the driving wheel can be actively driven to rotate by a driving motor 51, and the welding head 6 can be a common laser welding head for laser welding, or electromagnetic pulse welding or other welding forms.

The welding head 6 is usually welded between a pair of pressing wheels 241, because the pair of pressing wheels 241 cooperates with any one positioning wheel 23 to jointly push the outer circumferential surface of the current collecting ring 91 to contact the inner circumferential surface of the end of the battery 9 to form close contact, and further when a pressing, positioning, rotating and supporting structure is formed between the pressing wheels 241 and the positioning wheel 23, the welding position between the pair of pressing wheels 241 always keeps accurate and stable along with the rotation of the battery 9 driven by the driving wheel 5, that is, when the welding head 6 performs circumferential welding at the position, the outer circumferential surface of the current collecting ring 91 and the inner circumferential surface of the end of the battery 9 can always be ensured to be close contact and prevented from displacement, so that the reliability of the welding quality is better improved.

However, a plurality of sets of driving wheels 5 and welding heads 6 corresponding to each other may be disposed beside the plurality of positioning grooves 22, which is to ensure that, in the actual processing process, if the welding of the current collecting ring 91 at the end of the battery cannot be effectively completed at the station of one positioning groove 22, the welding can be continued to the station of the next or next positioning groove 22, so that the welding time at one station can be saved, the operation efficiency and the production efficiency of the device can be improved, and the reliability of the welding quality can be ensured.

The working process of the invention is as follows: the batteries 9 are sequentially conveyed into the plurality of positioning grooves 22 of the working turntable 21 through the feeding mechanism 3, a pair of positioning wheels 23 adjacent to each positioning groove simultaneously contact the outer circumferential surface of each battery 9 to form positioning, and the working turntable 21 drives the batteries 9 in the positioning grooves 22 to rotate intermittently and drives the lifting mechanism 8 to move up and down.

Thus, when the working turntable 21 drives the battery 9 in the positioning groove 22 to gradually approach the driving wheel 5, the lifting mechanism 8 synchronously and gradually rises until the battery 9 contacts the driving wheel 5, the lifting mechanism 8 rises to the highest position and is matched with the pressing wheel auxiliary mechanism 24 to form the rotating supporting positioning of the bottom end and the top end of the battery 9, at this time, after the driving wheel 5 drives the battery 9 to rotate, the end part of the battery 9 can be subjected to circumferential welding of the current collecting ring by the welding head 6, then the working turntable 21 drives the battery 9 which completes the circumferential welding of the current collecting ring in the positioning groove 22 to gradually leave the driving wheel 5, the lifting mechanism 8 synchronously and gradually falls until the bottom end and the top end of the battery 9 are driven to be separated from the rotating supporting positioning together, and then the welded battery 9 can be sequentially output by the discharging mechanism 4.

The above working process relates to a side welding structure performed by obliquely placing the welding head 6 in this example, and the side welding structure can be generally used for circumferentially welding the end portion of the shell of the battery 9 and the current collecting ring, in the actual machining process, the welding head 6 can also be vertically placed above the battery 9 for plane welding, at this time, the driving wheel 5 does not need to rotate, and after the driving wheel 5 is matched with the pair of positioning wheels 23 to position the battery 9 together, the welding head 6 can weld the current collecting ring 91 to the end portion of the battery 9, for example, the side welding structure can be used for welding the full tab of the end portion of the battery cell 9 and the current collecting ring 91.

Moreover, depending on the machining position, it is possible to place the welding head 6 in another welding position, even if the rotation of the battery 9 is not involved, it is possible to omit the pair of positioning wheels 23 directly beside each positioning groove 22 in the overall structure.

In the embodiment, when the working turntable 21 drives the battery 9 in the positioning groove 22 to be located in the last positioning groove 22 of the driving wheel 5, the lifting mechanism 8 has already risen to the highest position and cooperates with the pressing wheel auxiliary mechanism 24 to form the rotational supporting and positioning of the bottom end and the top end of the battery 9, and when the working turntable 21 continues to rotate and drives the battery 9 in the positioning groove 22 to contact the driving wheel 5, the lifting mechanism 8 cooperates with the pressing wheel auxiliary mechanism 24 to always maintain the rotational supporting and positioning of the bottom end and the top end of the battery 9, which is designed to ensure that the welding head 6 can always obtain the rotational supporting and positioning of the bottom end and the top end of the battery 9 when performing the circumferential welding of the current collecting ring 91 on the end of the battery 9, thereby improving the reliability of the circumferential welding structure.

Obviously, the welding mode of carrying out the rotary battery conveying through the intermittent rotation of the working turntable 21, positioning the battery 9 and driving the battery to rotate to realize the circumferential welding of the current collecting ring 91 has the use advantages of high production efficiency, small occupied space, reliable welding quality and the like, and in practical use, the rotary welding machine not only welds the battery 9 and the current collecting ring 91, but also is suitable for welding other similar workpieces, and has a wide application range.

The above description is only a specific embodiment of the present invention, and it should be understood by those skilled in the art that any equivalent structural design to this embodiment is included in the protection scope of the present invention.

Claims

1. A rotary welding machine is mainly used for welding a current collecting ring (91) at the end part of a battery (9), and comprises a base (1), and a feeding mechanism (3) and a discharging mechanism (4) which are arranged on the base, and is characterized in that a working turntable (21) which is arranged in an intermittent rotating mode is arranged on the base (1), the working turntable is respectively connected with the feeding mechanism (3) and the discharging mechanism (4), a plurality of positioning grooves (22) are arranged on the outer circumference of the working turntable (21), and each positioning groove can be used for positioning or separating from the battery (9); a pair of positioning wheels (23) adjacent to each positioning groove (22) are arranged on the working turntable (21), the pair of positioning wheels are simultaneously contacted with the outer circumferential surface of the battery (9) in the positioning groove (22) to form positioning, a pinch roller auxiliary mechanism (24) is arranged above the battery (9) in each positioning groove (22), a lifting mechanism (8) is arranged below the battery, the lifting mechanism forms lifting movement along with the intermittent rotation of the working turntable (21), and a driving wheel (5) and a welding head (6) are arranged beside one or more positioning grooves (22); the intermittent rotation of the working turntable (21) drives the outer circumferential surface of a battery (9) in the positioning groove (22) to contact with the driving wheel (5), and simultaneously drives the lifting mechanism (8) to lift and push the battery (9), so that the bottom end of the battery forms a rotary support and the top end of the battery is matched with any one positioning wheel (23) by the pressing wheel auxiliary mechanism (24) to form a pressing, positioning and rotary support, and after the driving wheel (5) drives the battery (9) to rotate, the welding head (6) performs circumferential welding of the current collecting ring (91) on the end part of the battery (9).

2. The rotary welding machine of claim 1, wherein said pressure wheel assist mechanism (24) comprises a pressure wheel (241) and a pressure wheel cylinder (242) for driving the pressure wheel to reciprocate inside and outside; the lifting mechanism (8) lifts to push the top end of the battery (9) to be close to the pinch roller auxiliary mechanism (24), the pinch roller (241) is driven by the pinch roller cylinder (242) to move outwards and is matched with any one positioning wheel (23) to push the outer circumferential surface of the current collecting ring (91) to be in contact with the inner circumferential surface of the end part of the battery (9) to form a pressing, positioning, rotating and supporting structure; the pressing wheel (241) is driven by the pressing wheel cylinder (242) to move inwards to be disengaged from any one positioning wheel (23), and the lifting mechanism (8) descends to drive the top end of the battery (9) to be far away from the pressing wheel auxiliary mechanism (24).

3. The rotary welding machine of claim 1, wherein the lifting mechanism (8) comprises a driving disk (84), a fixed disk (85) and a plurality of lifting rods (81) which are arranged on the outer circumference of the driving disk in a lifting and sliding manner, the driving disk (84) and the working turntable (21) form a coaxial rotary installation, the fixed disk (85) is fixed relative to the working turntable (21), and a chute (851) which is in an elliptical shape and surrounds the circumference is arranged on the outer circumference of the fixed disk (85); the lifting rods (81) and the positioning grooves (22) on the outer circumference of the working turntable (21) are equal in number and consistent in position, the bottom end of each lifting rod (81) is provided with a pulley (83) assembled in the chute (851) in a rolling manner, and the top end of each lifting rod (81) is provided with a supporting and positioning rotating seat (82); the driving disc (84) and the working turntable (21) coaxially rotate, and the pulleys (83) at the bottom ends of the lifting rods (81) roll along the sliding grooves (851), so that the lifting rods (81) are driven to move up and down on the outer circumferential surface of the driving disc (84); the lifting rod (81) is lifted to drive the supporting and positioning rotary seat (82) to push the bottom end of the battery (9) and enable the bottom end of the battery to form a positioning and rotating support.

4. The rotary welding machine according to claim 1, wherein the periphery of said working turret (21) is provided with a surrounding working arc (74), and the plurality of positioning slots (22) and the working arc (74) define a working channel (75).

5. The rotary welding machine according to claim 4, wherein the feeding mechanism (3) comprises a feeding turntable (31), the outer circumference of the feeding turntable is provided with a plurality of feeding grooves (32), each feeding groove can be positioned or separated from a battery (9), a feeding channel (73) is formed between the plurality of feeding grooves (32) and a feeding arc edge (72) surrounding the periphery of the feeding turntable (31), the starting end of the feeding channel is provided with a feeding hole (71), and the terminating end of the feeding channel (73) is communicated with the starting end of the working channel (75).

6. The rotary welding machine according to claim 5, wherein the discharging mechanism (4) comprises a discharging turntable (41), a plurality of discharging grooves (42) are formed in the outer circumference of the discharging turntable, a battery (9) can be positioned or separated in each discharging groove, a discharging channel (77) is formed between the plurality of discharging grooves (42) and a discharging arc edge (76) surrounding the periphery of the discharging turntable (41), the starting end of the discharging channel is communicated with the terminating end of the working channel (75), and a discharging port (78) is formed in the terminating end of the discharging channel (77).

7. The rotary welding machine according to claim 6, characterized in that said feed turntable (31), said work turntable (21) and said discharge turntable (41) are in turn adapted to form intermittent coupled rotations in tangential engagement.

8. The rotary welding machine according to claim 7, characterized in that the feed turntable (31) is mounted on the feed shaft (12), the working turntable (21) is mounted on the main shaft (11), the discharge turntable (41) is mounted on the discharge shaft (13), the feed shaft (12), the main shaft (11) and the discharge shaft (13) are vertically and rotatably mounted on the base (1), and transmission gear sets (19) are arranged between the main shaft (11) and the feed shaft (12) and between the main shaft (11) and the discharge shaft (13).

9. A rotary welding machine according to claim 8, characterized in that said base (1) is provided with a drive motor (18) connected to said spindle (11) to form an intermittent rotary drive; the driving wheel (5) is driven to rotate by a driving motor (51).

10. The rotary welding machine according to claim 7, characterized in that the inlet opening (71), the inlet arc edge (72), the working arc edge (74), the outlet arc edge (76) and the outlet opening (78) are formed by a baffle (7) arranged on the base (1).