Roller welding head and roller welding device

Abstract

The utility model provides a roll welding head and a roll welding device. The roll welding head comprises a welding handle, a first rolling wheel, a connecting part and a second rolling wheel which are sequentially connected in the axial direction of the roll welding head, and welding working faces are formed on the outer circumferences of the first rolling wheel and the second rolling wheel. According to the roll welding device, the roll welding head is provided with the two welding working faces, in the conveying process of the to-be-welded workpiece, the welding working face on the first rolling wheel is welded to form an aligned welding seam, the welding working face on the second rolling wheel is welded to form an overflowing welding seam, and the action processes of feeding, unwinding, roll welding, dust removal and winding do not need to be repeated twice; and the welding processing efficiency can be improved. And moreover, the states that the pole piece and the foil are welded to form an overflowing welding seam and the welding seam is not aligned do not exist, so that the phenomena of collapse and wrinkling of the pole lug can be reduced, and the process yield is improved.

Description

Technical Field

[0001] The present application relates to the technical field of roll welding, and in particular to a roll welding head and a roll welding device. Background Art

[0002] The upper and lower molds of the current ultrasonic roller welding machine adopt a circular single-roller welding head. Due to the limitations of the structural characteristics of the welding head, the structural design of the double welds requires repeated loading, unwinding, roller welding, dust removal, and winding actions twice to achieve the welding of the over-current welds and the welding of the alignment welds at different positions of the pole ear, which seriously limits the roller welding process rhythm and efficiency. At the same time, during the first roller welding and winding process, the pole ear has a doubled weight due to the welding of a layer of pole ears of the same size. The outer pole ear is very prone to collapse and wrinkling, which greatly affects the process yield. Utility Model Content

[0003] The present application provides a roller welding head and a roller welding device that are beneficial to improving processing efficiency and process yield.

[0004] In a first aspect, an embodiment of the present application provides a roller welding head, which includes a welding handle, a first roller, a connecting portion, and a second roller connected in sequence along the axial direction of the roller welding head, and the outer circumferences of the first roller and the second roller both form welding working surfaces.

[0005] According to the first aspect, in a possible implementation manner, a distance between the first roller and the second roller is less than or equal to 55 mm.

[0006] According to the first aspect, in a possible implementation manner, the thickness of the first roller along the axial direction of the roller welding head is 3 mm to 12 mm; and / or the thickness of the second roller along the axial direction of the roller welding head is 3 mm to 12 mm.

[0007] According to the first aspect, in a possible implementation manner, the outer circumferential diameter of the first roller is 40 mm to 60 mm; and / or the outer circumferential diameter of the second roller is 40 mm to 60 mm.

[0008] According to the first aspect, in a possible implementation manner, the welding working surface has a texture structure or an electric spark pattern.

[0009] According to the first aspect, in a possible implementation, an outer circumference of at least one of the first roller and the second roller is further formed with an avoidance surface connected to the welding work surface, and a connection between the avoidance surface and the corresponding welding work surface has a smooth transition.

[0010] According to the first aspect, in a possible implementation, an end of the welding handle away from the first roller forms a connecting head, and the connecting head is a non-rotating structure, and the connecting head is used to connect to a driving member.

[0011] According to the first aspect, in a possible implementation manner, the length of the connecting head along the axial direction of the roller welding head is 10 mm to 15 mm.

[0012] According to the first aspect, in a possible implementation manner, at least two mounting holes are provided on the outer side surface of the welding handle, and the at least two mounting holes are spaced apart along the circumference of the welding handle.

[0013] According to the first aspect, in a possible implementation manner, a connection between the welding handle and the first roller, a connection between the first roller and the connecting portion, and a connection between the connecting portion and the second roller all form a transition surface.

[0014] According to the first aspect, in a possible implementation manner, on an axial cross section of the roller welding head, an edge of the transition surface includes a straight line, an arc, a sine curve, or a cosine curve.

[0015] According to the first aspect, in a possible implementation manner, the welding handle, the first roller, the connecting portion and the second roller are an integrally formed part.

[0016] According to the first aspect, in a possible implementation manner, a weight-reducing groove is formed at an end of the second roller facing away from the first roller.

[0017] According to the first aspect, in a possible implementation manner, the depth of the weight-reducing groove along the axial direction of the roller welding head is h, and the thickness of the second roller along the axial direction of the roller welding head is H, wherein h≤H / 3.

[0018] In a second aspect, an embodiment of the present application further provides a roller welding device, which includes a first welding head, and the first welding head is the roller welding head according to the first aspect.

[0019] According to the second aspect, in a possible implementation, the roller welding device also includes a second welding head, and the second welding head is the roller welding head according to the first aspect, and the first welding head and the second welding head are arranged at intervals along a first direction; an extrusion welding channel is formed between the first welding head and the second welding head for the workpiece to be welded to pass through, and the welding working surface of the first welding head and the welding working surface of the second welding head are aligned one by one along the first direction, and the first direction is perpendicular to the axial direction of the roller welding head.

[0020] The roller welding head and roller welding device provided by the present application are applied to the roller welding device. As the pole piece and foil (the workpiece to be welded) are transported, the roller welding head vibrates at high frequency while rotating. The welding working surface of the first roller forms a neat weld on the pole piece and foil, and the welding working surface of the second roller forms a flow-through weld on the pole piece and foil. There is no need to repeat the action process of loading, unwinding, roller welding, dust removal, and winding twice, which can improve the welding process efficiency. In addition, there is no state where the pole piece and foil are welded to form a flow-through weld and the flow-through weld is not welded, which can reduce the collapse and wrinkling of the pole ear and improve the process yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the cooperation between the roller welding device provided by one embodiment of the present application and the workpiece to be welded;

[0023] Figure 2 is a schematic diagram of the cooperation between a roller welding device and a workpiece to be welded provided in another embodiment of the present application;

[0024] Figure 3 is a schematic diagram of the cooperation between a roller welding head and a workpiece to be welded provided by an embodiment;

[0025] Figure 4 is a schematic diagram of a roller welding head provided in one embodiment;

[0026] Figure 5 is a front view schematic diagram of a roller welding head provided in one embodiment;

[0027] Figure 6 yes Figure 5 A schematic cross-sectional view of a roller welding head along the AA direction is provided;

[0028] Figure 7 is a front view schematic diagram of a roller welding head provided in another embodiment;

[0029] Figure 8 yes Figure 7 A schematic cross-sectional view of a roller welding head along the BB direction is provided.

[0030] Reference numerals:

[0031] 1000-roller welding device; 1001-first welding head; 1002-second welding head; 100-roller welding head; 10-welding handle; 11-connecting head; 13-mounting hole; 14-auxiliary section; 20-first roller; 30-connecting part; 40-second roller; 41-weight reduction groove; 51-welding working surface; 52-avoidance surface; 611-first transition surface; 612-second transition surface; 613-third transition surface; 614-fourth transition surface; 615-fifth transition surface; 201-workpiece to be welded; 202-collimating weld; 203-current weld. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0035] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] See also Figure 1 The present application provides a roller welding device 1000, including a roller welding head 100. In one embodiment, the workpiece 201 to be welded is illustrated by taking a pole piece and a foil as an example. When the roller welding device 1000 is working, the foil is placed on the pole piece at a preset position, and the pole piece and the foil are conveyed synchronously at a uniform speed. The roller welding head 100 rotates along the conveying direction and vibrates at a high frequency along a first direction X at the same time, so that the pole piece and the foil are welded together to form a pole ear.

[0037] In another embodiment, the roller welding heads 100 may also be arranged in pairs, see Figure 2For the convenience of description, a pair of roller welding heads 100 are defined as a first welding head 1001 and a second welding head 1002, respectively. The first welding head 1001 and the second welding head 1002 are arranged at intervals along the first direction X, and an extrusion welding channel is formed between the first welding head 1001 and the second welding head 1002. The first direction X is perpendicular to the axial direction of the first welding head 1001. In this embodiment, the workpiece 201 to be welded is described by taking a pole piece and a foil as an example. The foil is placed on the pole piece at a preset position, and the pole piece and the foil pass through the extrusion welding channel and are transported synchronously at a uniform speed. The first welding head 1001 and the second welding head 1002 cooperate to press the pole piece and the foil, and perform high-frequency vibration along the first direction X while rotating along the conveying direction to weld the pole piece and the foil together to form a pole ear.

[0038] It can be understood that the roller welding device 1000 can be a resistance welding device. In this case, the first welding head 1001 and the second welding head 1002 are connected to different electrodes respectively. The first welding head 1001 and the second welding head 1002 are respectively intermittently in contact with the electrode piece and the foil under high-frequency vibration, so that the contact between the electrode piece and the foil is electrically conductive and welded together at high temperature. The roller welding device 1000 can also be an ultrasonic welding device. The first welding head 1001 and the second welding head 1002 can squeeze the electrode piece and the foil under high-frequency vibration, and the electrode piece and the foil are squeezed and heat is accumulated at the squeezed part to fuse into one.

[0039] The roller welding device 1000 may include a frame, a transducer, a driving member and a support seat. The roller welding head 100 is installed on the frame through the support seat. The output end of the driving member is connected to the roller welding head 100 to drive the roller welding head to rotate. The transducer is connected to the roller welding head 100, and the transducer generates high-frequency rotation and transmits it to the roller welding head 100. The axial position of the roller welding head 100 is limited by the support seat, which ensures the smoothness of the rotation of the roller welding head 100, avoids the shaking and deviation of the roller welding head 100 when performing high-frequency vibration, and improves the welding quality.

[0040] In addition, the roller welding device 1000 may also include necessary or non-essential structures such as a tension traction mechanism and a winding mechanism, which will not be described in detail in this application.

[0041] See also Figure 3 and Figure 4The roller welding head 100 includes a welding handle 10, a first roller 20, a connecting portion 30 and a second roller 40 which are sequentially connected along its axial direction. The welding handle 10 is used to connect with an external driving member, so that the driving member can drive the entire roller welding head 100 to rotate. The connecting portion 30 connects the first roller 20 and the second roller 40 to form an integral structure, which is conducive to the transmission of high-frequency vibration. The outer circumferences of the first roller 20 and the second roller 40 both form welding working surfaces 51. The welding working surfaces 51 on the first roller 20 and the welding working surfaces 51 on the second roller 40 are located at the same end of the welding handle 10. Therefore, the side of the second roller 40 facing away from the first roller 20 does not have other structures, so it can be suitable for welding one side edge of a material with a larger width.

[0042] It can be understood that the projections of the welding working surface 51 on the first roller 20 and the welding working surface 51 on the second roller 40 along the axial direction of the roller welding head 100 should be completely overlapping circles. At this time, the first welding working surface 51 and the second welding working surface 51 can contact the foil at the same time, so that the over-current weld 203 and the lining weld 202 can be welded at the same time. The distance between the welding working surface 51 on the first roller 20 and the welding working surface 51 on the second roller 40 should be consistent with the spacing requirements of the lining weld 202 and the over-current weld 203 on the tab.

[0043] The vertical distance between any point of the outer wall of the welding handle 10 and the axis of the welding working surface 51 is smaller than the diameter of the welding working surface 51, that is, the projection of the welding working surface 51 along the axial direction of the roller welding head 100 is located outside the projection of the welding handle 10 and the connecting part 30 along the axial direction of the roller welding head 100, thereby ensuring that the welding working surface 51 contacts and squeezes the electrode and the foil to realize the welding process.

[0044] Taking two roller welding heads 100 for welding pole pieces and foil as an example, both roller welding heads 100 have two welding working surfaces 51 spaced apart along the axial direction of the roller welding heads 100, and the welding working surfaces 51 on the first rollers 20 of the two roller welding heads 100 are aligned along the first direction X, and the welding working surfaces 51 on the second rollers 40 are aligned along the first direction X. The welding working surface 51 on the first roller 20 is welded to form a gathering weld 202, which plays the role of gathering the pole ears; the welding working surface 51 on the second roller 40 is welded to form a flow-through weld 203, which plays the role of receiving the flow. During the transportation of the pole piece and the foil, the roller welding head 100 can weld the flow-through weld 203 and the gathering weld 202 at one time, without repeating the action process of loading, unwinding, roller welding, dust removal, and winding twice, which can improve the welding processing efficiency. Furthermore, there is no state between the electrode piece and the foil material where there is no welding to form an over-current weld 203 or no welding to form a collected weld 202, which can reduce the collapse and wrinkling of the electrode ear formed by welding and improve the process yield.

[0045] In some embodiments, the welding handle 10, the first roller 20, the connecting portion 30 and the second roller 40 are an integrally formed part, that is, the roller welding head 100 is an integral structure, and the first roller 20 and the second roller 40 are rigidly connected, so that the first roller 20 and the second roller 40 have similar amplitude variation capabilities, thereby improving the welding consistency of the overflow weld 203 and the finishing weld 202.

[0046] Based on the above embodiment, the distance between the first roller 20 and the second roller 40 is less than or equal to 55 mm, and the distance between the first roller 20 and the second roller 40 refers to the distance from the midpoint of the first roller 20 to the end point of the second roller 40, so as to avoid that the spacing between the first roller 20 and the second roller 40 is too large, resulting in a large difference in amplitude and capacity between the welding working surface 51 on the first roller 20 and the welding working surface 51 on the second roller 40, thereby further improving the welding consistency of the overflow weld 203 and the finishing weld 202.

[0047] In some embodiments, the welding working surface 51 has a texture structure or an electric spark pattern. The texture structure and the electric spark pattern make the welding working surface 51 uneven, and the contact area of ​​the welding working surface 51 when in contact with the foil is reduced, which increases the contact force of the welding head during high-frequency vibration, and at the same time reduces the probability of the welding head repeatedly acting on the same area under high-frequency vibration. Under the high-frequency vibration of the welding head, the uneven texture structure or electric spark pattern on the welding working surface 51 continuously transmits to various places of the welding contact surface of the electrode and the foil, so that the interfaces of the welding contact surface accumulate heat and fuse into one.

[0048] The texture structure can be a straight tooth texture or an oblique tooth texture arranged in an array. Specifically, it can be a strip tooth texture composed of a number of parallel and equidistantly arranged strip columns, a spherical concave-convex tooth texture composed of a number of spherical columns arranged at equal intervals, or a conical concave-convex tooth texture composed of a number of quadrangular pyramids arranged at equal intervals. The electric spark pattern is a surface effect formed by discharge machining of an electrode and a roller welding head 100. Specifically, the electric spark pattern is a pockmark structure formed on the welding working surface 51, and the coarseness of the pockmarks can be adjusted by the current of the spark machine.

[0049] See also Figure 3 and Figure 4The outer circumference of the first roller 20 is also formed with an avoidance surface 52, which is connected to the edge of the welding working surface 51 on the first roller 20 along the axial direction of the roller welding head 100, and the connection between the avoidance surface 52 and the welding working surface 51 is smoothly transitioned to avoid the edge of the welding working surface 51 from forming sharp edges. The avoidance surface 52 can protect the foil and the electrode piece, prevent the foil and the electrode piece from breaking or damaging under the high-frequency vibration of the roller welding head 100, and improve the welding quality. It can be understood that the two end edges of the welding working surface 51 along the axial direction of the roller welding head 100 can each be connected to a avoidance surface 52.

[0050] Similar to the structure of the first roller 20 , the outer circumference of the second roller 40 is further formed with an avoidance surface 52 connected to the edge of the welding working surface 51 .

[0051] The radial dimension of each avoidance surface 52 is gradually reduced in the direction away from the welding working surface 51, and the avoidance surface 52 can be a convex arc surface. During the welding operation, the welding seam (the lining weld 202 and the over-current weld 203) receives the greatest extrusion force, and the edge of the weld receives less and less extrusion force in the direction away from the weld until there is no extrusion force. This prevents the foil and the electrode from being broken or damaged under the high-frequency vibration of the roller welding head 100, thereby improving the welding quality.

[0052] The outer diameters of the first roller 20 and the second roller 40 are consistent, and the outer diameters of the first roller 20 and the second roller 40 are 40 mm to 60 mm, that is, the diameter of the welding working surface 51 is 40 mm to 60 mm. The size difference between the welding working surface 51 and the connecting portion 30 is ensured to prevent other structures except the rollers (the first roller 20 and the second roller 40) from contacting the workpiece 201 to be welded. And the larger the diameter of the welding working surface 51, the smoother the change in the distance between the welding working surface 51 and the workpiece 201 to be welded.

[0053] The thickness of the first roller and the thickness of the second roller 40 can be the same or different. The thickness of the first roller 20 is constrained by the trimming weld 202, and the thickness of the first roller 20 along the axial direction of the roller welding head 100 is 3mm to 12mm; the thickness of the second roller 40 is constrained by the flow weld 203, and the thickness of the second roller 40 along the axial direction of the roller welding head 100 is 3mm to 12mm. It is ensured that a welding working surface 51 of sufficient width can be formed for welding to form the trimming weld 202 and the flow weld 203. The outer circumference of the first roller 20 and the second roller 40 has a welding working surface 51 and two avoidance surfaces 52 along the axial direction of the roller welding head 100. In order to meet the requirements of aligning the weld 202 and the over-current weld 203, the width of the welding working surface 51 along the axial direction of the roller welding head is 2mm to 6mm, and the surface of the welding working surface 51 is arranged in an array or electric spark pattern with helical teeth or straight teeth; the avoidance surface 52 is an arc surface, and the arc radius of the avoidance surface 52 is 0.5mm to 3mm.

[0054] See also Figure 5 and Figure 6 The end of the welding handle 10 away from the first roller 20 forms a connector 11, and the connector 11 is a non-rotating structure. The driving member can be connected to the connector 11 by gear transmission, chain transmission, belt transmission, shaft transmission, etc., so as to drive the roller welding head 100 to rotate. The connector 11 adopts a non-rotating structure to facilitate torque transmission and avoid slipping, decoupling, etc. during the transmission process, thereby ensuring the stability of the rotation of the roller welding head 100, and can better match the conveying speed of the pole piece and the foil. At the same time, the connector 11 can also be rotatably fixed on the frame through a support seat.

[0055] The connector 11 may be a prismatic structure, a spline structure or a toothed structure, or may be formed into a non-rotating structure by opening a keyway or cutting the connector 11. The connector 11 and a portion of the support seat form a support surface.

[0056] The axial length of the connecting head 11 along the roller welding head 100 is 10 mm to 15 mm, ensuring that the roller welding head 100 has a supporting surface of sufficient length, avoiding the roller welding head 100 from swinging around the support seat as a fulcrum, and improving the position stability of the roller welding head 100.

[0057] See also Figure 5 and Figure 6 The outer side surface of the welding handle 10 is provided with a mounting hole 13, the number of the mounting holes 13 is two or more, and the mounting holes 13 are spaced along the circumference of the welding handle 10. When the roller welding head 100 and the support seat are disassembled and assembled, a rod-like structure is used to extend into the mounting hole 13 and connect with the roller welding head 100, and then the rod-like structure extending into the mounting hole 13 is limited to limit the rotation of the roller welding head 100, so as to facilitate the application of force for related operations. The mounting hole 13 can be a threaded hole, and the rod-like structure has an external thread. The rod-like structure can also be made of standard parts such as bolts and screws. The rod-like structure extends into the mounting hole 13 and is threadedly connected with the mounting hole 13, and the rod-like structure is temporarily fixed on the roller welding head 100.

[0058] When the number of mounting holes 13 is two, the two mounting holes 13 are arranged opposite to each other. When the number of mounting holes 13 is three, four or more, the mounting holes 13 are evenly spaced along the circumference of the welding handle 10. In other embodiments, the mounting holes 13 can also be spaced along the axial direction of the roller welding head 100. The present application does not limit the number and arrangement of the mounting holes 13, and they can be set according to actual limit requirements.

[0059] The welding handle 10 has an auxiliary section 14 protruding in the radial direction, and the mounting hole 13 is opened on the outer wall of the auxiliary section 14. The hole depth of the mounting hole 13 is not greater than the thickness of the auxiliary section 14, so as to ensure the overall strength of the welding handle 10 and ensure the effective transmission of high-frequency vibration. The auxiliary section 14 can be a cylindrical structure with a diameter of 25 mm to 35 mm; the auxiliary section 14 can also be a boss structure arranged at the position where the mounting hole 13 needs to be opened.

[0060] See also Figure 7 and Figure 8 In some embodiments, the connection between the welding handle 10 and the first roller 20, the connection between the first roller 20 and the connecting portion 30, and the connection between the connecting portion 30 and the second roller 40 all form a transition surface. This prevents the roller welding head 100 from having a sudden change in size along its own axial direction, reduces the phenomenon of stress concentration, and reduces the risk of fracture of the welding handle 10. Among them, on the axial section of the roller welding head 100, the edge of the transition surface includes a straight line, an arc, a sine curve or a cosine curve, so as to achieve a smooth transition between structures of different sizes of the roller welding head 100.

[0061] Specifically, the transition surface between the connector 11 and the auxiliary section 14 is a first transition surface 611. The first transition surface 611 is annular and gradually increases from small to large. The first transition surface 611 can be a linear gradient, a circular gradient, a sine gradient, a cosine gradient, etc. The gradient diameter is between 15mm and 35mm, and the length of the gradient surface is 20mm to 40mm.

[0062] The second transition surface 612 and the third transition surface 613 are sequentially arranged along the axial direction of the roller welding head 100 between the auxiliary section 14 and the first roller 20. The second transition surface 612 is an annular surface that gradually changes from large to small. The second transition surface 612 can be a linear gradient, a circular gradient, a sine gradient, a cosine gradient, etc. The gradient diameter of the second transition surface 612 is 35mm to 20mm, and the gradient length is 20mm to 40mm; the third transition surface 613 is an annular surface that gradually changes from small to large. The third transition surface 613 can be a linear gradient, a circular gradient, a sine gradient, a cosine gradient, etc. The gradient diameter of the third transition surface 613 is between 20mm and 50mm, and the gradient length is 20mm to 40mm;

[0063] The connecting portion 30 is a transition area between the first roller 20 and the second roller 40. The connecting portion 30 is cylindrical, and the diameter of the connecting portion 30 is between 15 mm and 25 mm. The transition surface at the connection between the connecting portion 30 and the first roller 20 is the fourth transition surface 614, and the transition surface at the connection between the connecting portion 30 and the second roller 40 is the fifth transition surface 615. The fourth transition surface 614 and the fifth transition surface 615 are symmetrically gradient annular surfaces. The fourth / fifth transition surface can be linear gradient, circular gradient, sine gradient, cosine gradient, etc. The gradient diameter of the fourth / fifth transition surface is between 18 mm and 30 mm, and the gradient length is 4 mm to 7 mm. The length of the connecting portion 30 excluding the fourth transition surface 614 and the fifth transition surface 615 is 8 mm to 14 mm, or the outer peripheral surface of the connecting portion 30 is composed of the fourth transition surface 614 and the fifth transition surface 615.

[0064] It can be understood that after installation, the roller welding head 100 forms a cantilever structure similar to the support seat as the fulcrum. By opening a weight-reducing groove 41 at the end of the second roller 40 away from the first roller 20, the weight of the end of the roller welding head 100 is reduced to avoid deformation of the end due to excessive weight, thereby ensuring that the extrusion welding channel between the first rollers 20 of the two roller welding heads 100 and the extrusion welding channel between the second rollers 40 of the two roller welding heads 100 have high consistency and stability.

[0065] The depth of the weight-reducing groove 41 along the axial direction of the roller welding head 100 can be 0.5 mm to 2 mm. It can be understood that the greater the thickness of the second roller 40, the greater the depth of the weight-reducing groove 41 can be set. The depth of the weight-reducing groove 41 along the axial direction of the roller welding head 100 is h, and the thickness of the second roller 40 along the axial direction of the roller welding head 100 is H, where h≤H / 3. Since the outer peripheral surface of the second roller 40 has a welding working surface 51, the welding working surface 51 performs extrusion welding when the second roller 40 needs to transmit high-frequency vibration, so as to avoid the weight-reducing groove 41 being too deep to affect the overall strength of the roller welding head 100.

[0066] In other embodiments, the depth of the weight-reducing groove 41 along the axial direction of the roller welding head 100 can also be controlled to be smaller than the axial dimension corresponding to the avoidance surface 52, that is, the setting of the weight-reducing groove 41 does not affect the vibration transmission and pressure-bearing capacity of the welding working surface 51 on the second roller 40.

[0067] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0068] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A roller welding head, characterized in that: The roller welding head comprises a welding handle, a first roller, a connecting portion and a second roller which are sequentially connected along the axial direction of the roller welding head, and the outer circumferences of the first roller and the second roller both form welding working surfaces.

2. The roller welding head according to claim 1, characterized in that: The distance between the first roller and the second roller is less than or equal to 55 mm.

3. The roller welding head according to claim 1, characterized in that: The thickness of the first roller along the axial direction of the roller welding head is 3 mm to 12 mm; and / or the thickness of the second roller along the axial direction of the roller welding head is 3 mm to 12 mm.

4. The roller welding head according to claim 1, characterized in that: The outer circumference diameters of the first roller and the second roller are both 40 mm to 60 mm.

5. The roller welding head according to claim 1, characterized in that: The welding working surface has a texture structure or an electric spark pattern.

6. The roller welding head according to claim 1, characterized in that: An avoidance surface connected to the welding working surface is further formed on the outer circumference of at least one of the first roller and the second roller, and a connection between the avoidance surface and the corresponding welding working surface has a smooth transition.

7. The roller welding head according to claim 1, characterized in that: One end of the welding handle away from the first roller forms a connecting head, and the connecting head is a non-rotating structure, and the connecting head is used to connect a driving member.

8. The roller welding head according to claim 7, characterized in that: The length of the connecting head along the axial direction of the roller welding head is 10 mm to 15 mm.

9. The roller welding head according to claim 1, characterized in that: At least two mounting holes are provided on the outer side surface of the welding handle, and at least two mounting holes are arranged at intervals along the circumference of the welding handle.

10. The roller welding head according to claim 1, characterized in that: A connection between the welding handle and the first roller, a connection between the first roller and the connecting portion, and a connection between the connecting portion and the second roller all form a transition surface.

11. The roller welding head according to claim 10, characterized in that: In the axial cross section of the roller welding head, the edge of the transition surface includes a straight line, an arc, a sine curve or a cosine curve.

12. The roller welding head according to claim 1, characterized in that: The welding handle, the first roller, the connecting portion and the second roller are integrally formed parts.

13. The roller welding head according to claim 1, characterized in that: A weight-reducing groove is formed at one end of the second roller away from the first roller.

14. The roller welding head according to claim 13, characterized in that: The depth of the weight-reducing groove along the axial direction of the roller welding head is h, and the thickness of the second roller along the axial direction of the roller welding head is H, wherein h≤H / 3.

15. A roller welding device, characterized in that: The roller welding device comprises a first welding head, and the first welding head is a roller welding head according to any one of claims 1 to 14.

16. The roller welding device according to claim 15, characterized in that: The roller welding device also includes a second welding head, which is a roller welding head according to any one of claims 1 to 14, and the first welding head and the second welding head are arranged at intervals along a first direction; an extrusion welding channel is formed between the first welding head and the second welding head for the workpiece to be welded to pass through, and the welding working surface of the first welding head and the welding working surface of the second welding head are aligned one-to-one along the first direction, and the first direction is perpendicular to the axial direction of the roller welding head.

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