CN110640379A

CN110640379A - Positioning mechanism and welding auxiliary device

Info

Publication number: CN110640379A
Application number: CN201911031576.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Wuxi Lead Intelligent Equipment Co Ltd
Current assignee: Wuxi Lead Intelligent Equipment Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-01-03

Abstract

The application relates to a positioning mechanism and a welding auxiliary device, which are used for positioning an object positioned at a welding station. Wherein, the positioning mechanism comprises a base; the bearing plate is arranged on the base in a sliding manner; the positioning piece can move relative to the base along with the bearing plate; the first driving assembly is connected with the bearing plate and used for always applying a first acting force towards the welding station to the bearing plate; and the second driving assembly is movably connected with the bearing plate and is used for applying a second acting force which is far away from the welding station and has a variable size to the bearing plate. The positioning mechanism in this application adjusts the effort of applying on moving the loading board through two drive assembly combinations for the loading board changes its motion state at different stress state, with the motion of keeping away from the article towards or.

Description

Positioning mechanism and welding auxiliary device

Technical Field

The application relates to the field of mechanical manufacturing, in particular to a positioning mechanism and a welding auxiliary device.

Background

The core energy storage component of the lithium ion battery is a pole piece, the two ends of the pole piece are lugs, the lugs are metal conductors leading out the positive pole and the negative pole from the battery core, and the lugs are the lugs of the positive pole and the negative pole of the battery in popular terms and are contact points during charging and discharging.

At present, in the production process of cylindrical lithium batteries, the pole lugs need to be welded. A common approach is to carry the battery through the welding station in sequence via a plurality of adapters. After the welding of the electrode lugs at the welding station is finished, the electrode lugs are transmitted to the next procedure by the adapter piece. Before welding, in order to ensure the welding effect, the position correctness of the lug in the welding station needs to be determined.

However, since the adaptor needs to be started and stopped when transporting the battery to the welding station, the battery may be started and stopped, and the position of the tab in the welding station may be deviated. And because the welding process is fast, the operation speed of the adapter is fast, so the retention time of the battery and the electrode lug at the welding station is short, and the common positioning mechanism can not be applied to the occasions of high-speed welding.

Disclosure of Invention

The utility model aims at providing a positioning mechanism and welding auxiliary device can be comparatively conveniently fix a position the article that is in the welding station.

In order to solve the technical problem, the application adopts a technical scheme that:

a positioning mechanism for positioning an article at a welding station, comprising: a base; the bearing plate is arranged on the base in a sliding mode and is arranged opposite to the welding station;

the positioning piece is arranged on the bearing plate and can move relative to the base along with the bearing plate; the first driving assembly is arranged on the base and connected with the bearing plate; the first driving assembly is used for always applying a first acting force towards the welding station to the bearing plate; the second driving assembly is arranged opposite to the bearing plate, movably connected with the bearing plate and used for applying a second acting force which is far away from the welding station and has a variable size to the bearing plate; in an initial state, the second acting force is not smaller than the first acting force, so that the bearing plate and the positioning piece on the bearing plate are kept static; when the object is located at the welding station, the second acting force is smaller than the first acting force, so that the bearing plate moves towards the object under the driving of the first driving assembly, and the positioning piece on the bearing plate is close to and abuts against the object to position the object.

In an embodiment of the present application, the second driving assembly includes: the stop block is fixedly arranged on the bearing plate and can move towards or away from the welding station along with the bearing plate; the swinging piece is provided with two ends, one end of the swinging piece is matched with the stop block and is arranged on the motion path of the stop block so as to apply the second acting force to the stop block on the bearing plate; a rotating shaft connected to the other end of the swinging member; and the driving piece is connected with the rotating shaft and used for driving the swinging piece to do rotary swinging motion around the rotating shaft so as to adjust the second acting force applied to the stop block by the swinging piece.

In an embodiment of the application, the object is arranged on a transfer piece and is transferred to the welding station through the transfer piece, and a cam is arranged on a power source of the transfer piece; wherein the driver includes a follower that cooperates with the cam; when the follower follows the cam action, the rotating shaft is used for converting the linear action of the follower into the rotary-swing motion of the swing piece, so that the driving action of the first driving component and the transmission action of the adapter piece are synchronously carried out.

In an embodiment of the present application, the first driving assembly includes: the cylinder is arranged on the base and is arranged opposite to the bearing plate; the fixing block is arranged on the bearing plate; and the connecting rod is respectively connected with the output end of the cylinder and the fixing block, so that the cylinder drives the bearing plate and the positioning piece on the bearing plate to move close to or far away from the welding station.

In order to solve the above technical problem, the present application proposes another solution:

a welding auxiliary device is used for positioning a cylindrical battery positioned at a welding station, wherein the cylindrical battery is provided with a tab and is arranged in a support cup; wherein the welding assistance device includes: the first positioning mechanism is used for positioning the support cup; the second positioning mechanism is arranged opposite to the first positioning mechanism and used for positioning the lug; wherein the first positioning mechanism and the second positioning mechanism are the positioning mechanisms as described above.

In an embodiment of this application, among the first positioning mechanism the setting element be equipped with hold in the palm the outer peripheral face complex notch of cup, with hold in the palm the cup and carry cylindrical battery passes through during the welding station, make the setting element is close to and the butt hold in the palm the lateral surface of cup.

In an embodiment of the application, the support cup periphery side is equipped with the guide way, the notch with the guide way cooperation, in order the setting element supports when holding the support cup, adjusts the side orientation of cylindrical battery.

In an embodiment of the application, a positioning element in the second positioning mechanism is provided with a pressing nozzle, so that the positioning element in the first positioning mechanism supports and holds the supporting cup and adjusts the backward direction of the tab, so that the pressing nozzle supports and presses the surface of the tab, and further the tab can keep a tensioning state in the welding process.

In an embodiment of the present application, the pressure nozzle is provided with a through hole for allowing laser to pass through for welding the tab.

The beneficial effect of this application is: be different from prior art, this application provides a positioning mechanism and welding auxiliary device. The positioning mechanism is provided with a first driving assembly and a second driving assembly in a sliding way relative to the base, and the acting force exerted on the movable bearing plate is adjusted through the combination of the two driving assemblies, so that the bearing plate changes the motion state thereof in different stress states to move towards or away from the object; in addition, the positioning mechanism can drive the positioning piece in an indirect driving mode by arranging the second driving assembly, so that the impact of the positioning piece on an object in the positioning process can be reduced.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a positioning mechanism of the present application;

FIG. 2 is a schematic structural view of an embodiment of the positioning mechanism of FIG. 1;

fig. 3 is a schematic view of the structure of the welding assistance device in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that directional terms, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, referred to herein are solely for the purpose of reference to the orientation of the appended drawings and, thus, are used for better and clearer illustration and understanding of the present application, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered limiting of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a positioning mechanism 100 according to the present application, wherein the positioning mechanism 100 is used for positioning an object 20 located at a welding station 10. In this embodiment, the positioning mechanism 100 may include a base 110, a carrier plate 120, a positioning member 130, a first driving assembly 150, and a second driving assembly 140. Wherein, the carrier plate 120 is slidably disposed on the base 110; the positioning member 130 is disposed on the loading plate 120 and can move relative to the base 110 along with the loading plate 120; the first driving assembly 150 is disposed on the base and connected to the carrier plate 120; the second driving assembly 140 is disposed opposite to the carrier plate 120 and movably connected to the carrier plate 120.

Specifically, the first driving assembly 150 is always used for applying a first acting force to the bearing plate 120 towards the welding station 10; the second driving assembly 140 is used for applying a second force with a variable magnitude to the carrier plate 120 away from the welding station 10. In the initial state, the second acting force is not less than the first acting force, so that the bearing plate 120 and the positioning element 130 thereon are kept still; when the object 20 is at the welding station 10, the second acting force exerted on the carrying plate 120 by the second driving assembly 140 is smaller than the first acting force, so that the carrying plate 120 moves toward the object 20 under the driving of the first driving assembly 150, and the positioning member 130 thereon can approach and abut against the object 20, thereby positioning the object 20.

In a specific application scenario, the object 20 may be a battery. When the tab 21 of the battery needs to be welded, the tab is inverted and placed in the support cup 30, and the tab is carried by the support cup 30 to move. The support cups 30 are arranged on a transfer member (not shown), and the transfer member can convey a plurality of support cups 30, so as to drive the batteries to pass through the welding station 10 in sequence and transfer the batteries to the next station after welding.

It is understood that the positioning mechanism 100 of the present application can be applied to other objects, not limited to a battery, and those skilled in the art can make modifications according to the actual situation, but the scope of the present application should be protected as long as the inventive concept of the present application is not violated.

The present application provides a positioning mechanism 100, in which a positioning member 130 is slidably disposed relative to a base 110, and a first driving component 150 and a second driving component 140 are respectively disposed to drive the positioning member 130 by combining the two driving components. The positioning mechanism 100 can continuously apply a first acting force toward the welding station 10 to the carrier plate 120 through the first driving assembly 150, and the second driving assembly 140 controls the magnitude of a second acting force applied to the carrier plate 120, so as to control the movement state of the carrier plate 120. When the object 20 is located at the welding station 10, the second driving assembly 140 makes the second acting force smaller than the first acting force, so that the bearing plate 120 and the positioning member 130 thereon can move towards the object 20 under the driving of the first driving assembly 150, and the positioning member 130 can position the object 20 in an indirect force applying manner, thereby reducing the impact on the object 20 during the positioning process.

Further, referring to fig. 1, in order to realize the relative sliding between the carrier plate 120 and the base 110, in an embodiment, the base 110 is provided with a sliding rail 111 and a sliding block 112, which are matched with each other. Wherein the slide rail 111 is arranged towards the welding station 10 and the carrier plate 120 is arranged on the slide block 112. Therefore, under the driving of the first driving assembly 140, the supporting plate 120 can drive the positioning element 130 to move towards the object 20 located at the welding station 10 relative to the base 110 through the cooperation between the sliding block 112 and the sliding rail 111.

In addition, in order to prevent the slider 112 from sliding beyond the slide rail 111, stoppers (not shown) may be further provided at both ends of the slide rail 111. The stopper can also be used to buffer the impact force on the object 20 when the loading plate 120 moves towards the object 20, so as to prevent the positioning member 130 from damaging the tray 30 or the battery during the positioning process.

It is understood that the slide rail 111 and the slider 112 disposed on the base 110 are only one implementation manner, and in other embodiments, the slide rail and the slider may also be implemented by disposing a groove or a roller on the base 110, which is not described herein.

In an embodiment, the first driving assembly 150 may optionally include a cylinder 151, a fixing block 153, and a connecting rod 152. Wherein, the cylinder 151 is disposed on the base 110 and opposite to the bearing plate 120; the fixing block 153 is disposed on the bearing plate 120; the connecting rod 152 is respectively connected to the output end of the cylinder 151 and the fixing block 153, so that the cylinder 151 can continuously apply a first acting force to the bearing plate 120 toward the welding station 10, and when the second acting force is smaller than the first acting force, the bearing plate 120 is driven to move toward the welding station 10.

It will be appreciated that the second drive assembly 150 may also be replaced by a spring in order to achieve a constant force on the carrier plate 120 towards the object 20.

Further, the second driving assembly 140 may include a stopper 144, a swing member 141, a rotation shaft 142, and a driving member 143. The stopper 144 is fixedly arranged on the bearing plate 120 and can move towards or away from the welding station 10 along with the bearing plate 120; the swinging member 141 has two ends, one end of which is matched with the stopper 144 and is arranged on the motion path of the stopper 144, and the other end of which is fixedly connected with the rotating shaft 142; the rotating shaft 142 is fixedly arranged and is respectively connected with the swinging piece 141 and the driving piece 143; the driving element 143 is used for driving the rotating shaft 142 to rotate, and the rotating shaft 142 is used for driving the swinging element 141 to swing under the driving of the driving element 143. Therefore, the swinging member 141 exerts a second acting force on the stopper 144 and is adjusted to the magnitude thereof by the rotation of the rotating shaft 142, so that the swinging member 141 can further drive the bearing plate 120 and the positioning member 130 on the bearing plate 120 to move close to or away from the object 20.

Further, in an embodiment, the second driving assembly 140 further includes an adjusting swing arm 145, the adjusting swing arm 145 is disposed between the driving member 143 and the rotating shaft 142, and the length of the adjusting swing arm 145 is controlled to further control the swing amplitude of the swing member 141, so that the moving distance of the bearing plate 120 and the bearing plate 130 thereon on the base 110 can be controlled, and the positioning mechanism 100 is suitable for positioning in different situations.

Specifically, the carrier plate 120 may be disposed in an L-shape, and includes a first connection plate 121 and a second connection plate 122 disposed perpendicular to each other. The first connecting plate 121 is disposed on the slider 112, and the stopper 144 is disposed on the first connecting plate 121. One end of the swinging member 141 abuts against the stopper 144, so that the swinging member 141 controls the movement of the bearing plate 120 under the driving of the driving member 143.

Alternatively, the driving member 143 may be a motor or a rotary cylinder, and the rotary shaft 142 is a power output shaft of the driving member 143. Taking the driving part 143 as an example of a rotary cylinder, the rotation frequency of the rotary cylinder can be adjusted to be consistent with the start-stop frequency of the transfer battery of the adaptor, so that the object 20 can be quickly positioned when the object 20 is located at the welding station 10.

Further, when the adaptor drives the object 20 to be located at the welding station 10, the second acting force applied by the second driving assembly 140 to the bearing plate 120 should be smaller than the first acting force, so that the positioning element 130 on the bearing plate 120 can approach and abut against the object 20 under the action of the first driving assembly 150; when the adaptor carrying object 20 moves out of the welding station 10, the second force applied by the second driving assembly 140 to the carrier plate 120 should be greater than the first force, so that the positioning member 130 on the carrier plate 120 can be away from the welding station 10 by the second driving assembly 150. Therefore, considering the high commissioning cost of the driving member 143 in accordance with the action of the adaptor, in an embodiment, the driving member 143 may also be a follower, and a cam (not shown) cooperating with the follower is provided on the power source of the adaptor. Therefore, when the adaptor drives the object 20 to sequentially pass through the welding station 10, the transmission action of the adaptor and the driving action of the driving piece 143 are synchronized through the cooperation of the cam and the follower.

Specifically, referring to fig. 2 in conjunction with fig. 1, fig. 2 is a schematic structural diagram of the positioning mechanism 100 in another state in the embodiment of fig. 1. One implementation of the positioning mechanism 100 in the present application is described by taking the double-headed arrow in fig. 1 as an example. The direction a is a vertical direction, the direction B is a rotation direction around the rotation axis 142, and the direction C is a horizontal direction.

Take the example where the cam is elliptical in cross-section and is disposed below the driver 143. When the adaptor drives the object 20 to transfer towards the welding station 10, the longer end of the cam jacks up the driving part 143, so that the driving part 143 moves vertically upwards in the direction a; since the driving member 143 is connected to the rotating shaft 142, the rotating shaft 142 is rotated clockwise in the direction B; the swinging member 141 rotates clockwise in the B direction following the rotation shaft 142. At this time, since the swinging member 141 has a tendency to move away from the stopper 144, the second acting force applied by the second driving assembly 140 to the loading plate 120 is sharply reduced, so that the loading plate 120 and the positioning member 130 on the loading plate 120 are moved toward the welding station 10 in the direction C by the first driving assembly 150.

The longer end of the cam also peaks the drive member 143 as the adaptor carries the article 20 to the welding station 10. At this time, the positioning member 130 just abuts against the object 20 at the welding station 10, so as to position the object 20. In this process, the second acting force applied by the second driving assembly 140 to the carrier plate may be slightly smaller than the first acting force, so that the first driving assembly 150 can drive the positioning member 130 to abut against one side of the object 20 and apply a certain acting force to the object 20, thereby improving the positioning effect of the positioning member 130 to the object.

After the object 20 is welded, the adaptor drives the object 20 to move out of the welding station 10, at this time, the cam is in rotational transition from a longer end to a shorter end, thereby driving the driving part 143 to move vertically and downwards along the direction a, the rotating shaft 142 rotates counterclockwise along the direction B under the action of the driving part 143, and the oscillating part 141 rotates along the direction B along with the rotating shaft 142. At this time, since the swinging member 141 has a tendency to move toward the stopper 144, the second acting force exerted by the second driving assembly 140 on the loading plate 120 is much larger than the first acting force, and the loading plate 120 and the positioning member 130 on the loading plate 120 are further driven to move away from the welding station 10 along the direction C.

Because the driving member 143 of the adaptor and the second driving assembly 140 uses the same driving source, and the cam transmission mode is adopted to achieve the action consistency, and the response speed of the positioning action is fast, the debugging cost is saved, and the positioning mechanism 100 can be suitable for occasions of high-speed welding.

Of course, in other embodiments, the shape and the arrangement position of the outer contour of the cam can be adjusted by those skilled in the art according to the actual situation.

Further, in an embodiment, the positioning element 130 is disposed on the second connecting plate 122. In the case of a cylindrical lithium battery, in order to ensure the positioning effect, the positioning member 130 is provided with an arc-shaped notch matching the shape of the outer circumferential surface of the cup holder 30. Of course, in other embodiments, the shape of the notch can be adapted to the outer contour of the cup 30.

The present application is directed to a positioning mechanism 100 for positioning an article 20 at a welding station 10. The second driving assembly 140 is arranged, and the second driving assembly 140 drives the bearing plate 120 to move close to or away from the object 20 at the welding station 10, so that the positioning can be performed quickly; further, in the positioning mechanism 100 of the present embodiment, the first driving assembly 150 may adopt a non-rigid force applying manner such as an air cylinder 151 or a spring, and the impact of the positioning element 130 on the object 20 during the positioning process may be reduced after the first driving assembly 150 is cooperated with the second driving assembly 150 to act; in addition, the adapter used for transporting the object 20 and the second driving assembly 140 share the same driving source, and linkage is realized in a cam following mode, so that driving action of the second driving assembly 140 and transmission action of the adapter can be synchronously performed, and response speed of positioning action of the positioning member 130 is high, so that debugging cost of the positioning mechanism 100 and the adapter acting synchronously is saved.

Further, the researchers of the present application have found in long-term development that the orientation of the tab 21 and the degree of tension of the tab 21 are critical in determining the welding effect of the tab 21 when the object 20 is a battery. Thus, in one embodiment, the positioning member 130 is provided with a notch 131, and the outer peripheral side of the tray 30 is provided with a guide groove 31. When the positioning member 130 approaches and supports the tray 30, the tray 30 drives the battery and the tab 21 in the battery to adjust its orientation by the cooperation of the guide groove 31 and the notch 131.

Specifically, the opening direction of the guide groove 31 is parallel to the plane of the tab 21, and the notch 131 on the positioning member 130 is a straight groove. As a result, if the carrier cup 30 is transferred to the adapter several times, it will sway, which in turn will cause the orientation of the tab 21 to deviate when it reaches the welding station 10. At this time, a gap occurs when the notch 131 of the positioning member 130 is engaged with the guide groove 31 of the tray 30. As the positioning member 130 is further moved toward the object 20, the tray 30 is automatically adjusted to a fully engaged state by the engagement of the notch 131 with the guide slot 31. Therefore, the battery provided in the holder 30 and the tab 21 can adjust their orientation in this manner.

In one embodiment, in order to maintain the tab 21 in a tensioned state during the welding process, a pressing nozzle (not shown) may be further disposed on the carrier plate 120, and the pressing nozzle is used for pressing the tab 21 after the positioning member 130 presses the holding cup 30, so as to maintain the tab 21 in a tensioned state. Of course, in other embodiments, the pressure nozzle may be disposed on other positioning mechanisms 100 to cooperate with the positioning mechanism 100 provided with the positioning member 130. It is understood that the setting positions of the pressing nozzle and the positioning member 130 can be adjusted by those skilled in the art according to actual conditions to adapt to batteries of different models.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a welding auxiliary device 200 according to the present application. In the present embodiment, the welding assistance device 200 includes a first positioning mechanism 210 and a second positioning mechanism 220. The first positioning mechanism 210 and the second positioning mechanism 220 are arranged oppositely, the first positioning mechanism 210 is used for positioning a support cup (see fig. 1-2) in a welding station (see fig. 1-2) and adjusting the orientation of a tab (see fig. 1-2) of a battery in the support cup, and the second positioning mechanism 220 is used for pressing the tab after the orientation is adjusted so as to keep the tab in a tensioning state.

The positioning member 213 is disposed on the carrier plate 212 of the first positioning mechanism 210, and the pressing nozzle 223 is disposed on the carrier plate 222 of the second positioning mechanism 220. When the welding is considered, other sundries are prevented from falling into the battery shell, and the support cup carries the inverted batteries through the adapter piece to be welded sequentially through the welding station. Since the battery is disposed in an inverted state, the height of the support cup is greater than that of the tab, and therefore the height of the first positioning mechanism 210 is greater than that of the second positioning mechanism 220 in this embodiment. Of course, in other embodiments, the setting positions of the first positioning mechanism 210 and the second positioning mechanism 220 may be adjusted according to the setting state of the battery, and those skilled in the art may make the adjustment according to the actual situation.

Further, for example, using laser welding, in one embodiment, the pressing nozzle 223 is further provided with a through hole 2231 for allowing laser to pass through. The specific structures and implementations of the first positioning mechanism 210 and the second positioning mechanism 220 can refer to any of the above embodiments, which are not described herein again.

In summary, the present application provides a positioning mechanism and a welding auxiliary device. The positioning mechanism is provided with a first driving assembly and a second driving assembly, and the acting force exerted on the bearing plate is adjusted through the combination of the two driving assemblies, so that the bearing plate changes the motion state thereof in different stress states to move towards or away from the object; the positioning mechanism is provided with a second driving component, and can drive the positioning piece in an indirect driving mode, so that the impact of the positioning piece on an object in the positioning process can be reduced; furthermore, the positioning mechanism also sets the second driving assembly and the power source of the adapter which carries the object to rotate to be the same, so that the effect of synchronizing the transmission action with the object can be realized, the response speed of the positioning action is high, and the debugging cost can be saved.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A positioning mechanism for positioning an object at a welding station, comprising:

a base;

the bearing plate is arranged on the base in a sliding mode and is arranged opposite to the welding station;

the positioning piece is arranged on the bearing plate and can move relative to the base along with the bearing plate;

the first driving assembly is arranged on the base and connected with the bearing plate; the first driving assembly is used for always applying a first acting force towards the welding station to the bearing plate; and

the second driving assembly is arranged opposite to the bearing plate, is movably connected with the bearing plate and is used for applying a second acting force which is far away from the welding station and has a variable size to the bearing plate;

in an initial state, the second acting force is not smaller than the first acting force, so that the bearing plate and the positioning piece on the bearing plate are kept static; when the object is located at the welding station, the second acting force is smaller than the first acting force, so that the bearing plate moves towards the object under the driving of the first driving assembly, and the positioning piece on the bearing plate is close to and abuts against the object to position the object.

2. The positioning mechanism of claim 1, wherein the second drive assembly comprises:

the stop block is fixedly arranged on the bearing plate and can move towards or away from the welding station along with the bearing plate;

the swinging piece is provided with two ends, one end of the swinging piece is matched with the stop block and is arranged on the motion path of the stop block so as to apply the second acting force to the stop block on the bearing plate;

a rotating shaft connected to the other end of the swinging member; and

and the driving piece is connected with the rotating shaft and used for driving the swinging piece to do rotary swinging motion around the rotating shaft so as to adjust the second acting force applied to the stop block by the swinging piece.

3. The positioning mechanism of claim 2 wherein the object is disposed on an adapter and transferred to the welding station through the adapter, the adapter having a power source with a cam; wherein the driver includes a follower that cooperates with the cam;

when the follower follows the cam action, the rotating shaft is used for converting the linear action of the follower into the rotary-swing motion of the swing piece, so that the driving action of the first driving component and the transmission action of the adapter piece are synchronously carried out.

4. The positioning mechanism of claim 1, wherein the first drive assembly comprises:

the cylinder is arranged on the base and is arranged opposite to the bearing plate;

the fixing block is arranged on the bearing plate; and

and the connecting rod is respectively connected with the output end of the cylinder and the fixing block so as to enable the cylinder to drive the bearing plate and the positioning piece on the bearing plate to be close to or far away from the welding station to move.

5. The positioning mechanism as set forth in claim 1, wherein a slide rail facing the welding station is disposed on the base, and a slide block is disposed on the carrying plate and engaged with the slide rail, so that the carrying plate moves along the slide rail toward or away from the welding station under the driving of the first driving assembly.

6. The auxiliary welding device is characterized by being used for positioning a cylindrical battery positioned at a welding station, wherein the cylindrical battery is provided with a tab and is arranged in a support cup; wherein the welding assistance device includes:

the first positioning mechanism is used for positioning the support cup; and

the second positioning mechanism is arranged opposite to the first positioning mechanism and used for positioning the lug;

wherein the first positioning mechanism and the second positioning mechanism are the positioning mechanism according to any one of claims 1 to 5.

7. The welding assistance device of claim 6, wherein the positioning member of the first positioning mechanism is provided with a notch that fits the outer peripheral surface of the cup holder to allow the positioning member to approach and abut the outer side surface of the cup holder as the cup holder carries the cylindrical battery through the welding station.

8. The welding auxiliary device as claimed in claim 7, wherein a guide groove is formed on a side surface of the outer periphery of the cup holder, and the notch is matched with the guide groove to adjust a side surface orientation of the cylindrical battery when the positioning member abuts against the cup holder.

9. The welding auxiliary device according to claim 6, wherein a positioning member in the second positioning mechanism is provided with a pressing nozzle, so that after the positioning member in the first positioning mechanism abuts against the support cup and the orientation of the tab is adjusted, the pressing nozzle abuts against the surface of the tab, and the tab can be kept in a tensioned state in the welding process.

10. The welding assistance device of claim 9 wherein said pressure tip is provided with a through hole for allowing passage of laser light for welding said tab.