Welding head structure for roll welding and welding device

Abstract

The invention discloses a welding head structure for roll welding and a welding device, relates to the technical field of roll welding devices, and aims to solve the problem of how to reduce deformation of a welding head. The welding head structure comprises a welding roller and a roller shaft, the welding roller is coaxially connected to the roller shaft, the roller shaft comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are suitable for being connected with the first driving piece, and the first connecting part is located on one side of the welding roller in the axial direction of the welding roller. And the second connecting part is positioned on the other side of the welding roller.

Description

Technical Field

[0001] The present application relates to the technical field of roller welding devices, and particularly to a welding head structure and a welding device for roller welding. Background Art

[0002] Roller welding is a welding or composite process that realizes material connection through the pressure of rolling rollers. It can be applied to the welding of metal materials, such as soft metal foils or thin plates of aluminum, copper, nickel, etc.; it can also be applied to the lamination of non-metallic materials, such as plastic films.

[0003] In the prior art, when the welding head of roller welding cooperates with the supporting wheel to weld the workpiece to be welded, it is prone to warping and deformation due to the extrusion of the supporting wheel, resulting in insufficient pressing of the workpiece to be welded by the welding head and the supporting wheel, and affecting the welding quality. Summary of the Invention

[0004] The purpose of the present application is to provide a welding head structure and a welding device for roller welding, aiming to solve the problem of how to reduce the deformation of the welding head.

[0005] In a first aspect, the present application provides a welding head structure for roller welding. The roller welding includes a first driving member for driving the movement of the welding head structure. The welding head structure includes a welding roller and a roller shaft. The welding roller is coaxially connected to the roller shaft. The roller shaft includes a first connecting portion and a second connecting portion adapted to connect to the first driving member. Along the axial direction of the welding roller, the first connecting portion is located on one side of the welding roller, and the second connecting portion is located on the other side of the welding roller.

[0006] In the above solution, the welding roller is connected to the roller shaft. The first connecting portion and the second connecting portion of the roller shaft are respectively located on both sides of the welding roller, and both the first connecting portion and the second connecting portion are used to connect to the first driving member. When the first driving member drives the welding roller to move, the first connecting portion and the second connecting portion respectively provide supporting forces for the welding roller through the roller shaft on both sides of the welding roller. In this way, when the welding roller is extruded, both sides of the welding roller can be supported, and the problem of warping and deformation of the welding head structure due to uneven force can be avoided, improving the welding quality.

[0007] Optionally, the roller shaft includes a first balance bar and a second balance bar arranged at intervals along the axial direction of the roller shaft, and the welding roller is connected between the first balance bar and the second balance bar.

[0008] Optionally, the welding roller is provided with a connection hole; the roller shaft further includes a first connecting member, and the first connecting member passes through the connection hole and is connected between the first balance bar and the second balance bar.

[0009] Optionally, the first connecting member includes a first screw rod, and the first screw rod is connected to the first balance bar; the second balance bar is provided with a first threaded hole, and the first screw rod is threadedly connected to the first threaded hole.

[0010] Optionally, the first screw rod is a machine screw.

[0011] Optionally, both the first balance bar and the second balance bar are in contact with the welding roller.

[0012] Optionally, the outer peripheral surface of the first balance bar forms the first connecting portion, and the outer peripheral surface of the second balance bar forms the second connecting portion.

[0013] Optionally, the welding head structure further includes:

[0014] A first bearing, the inner ring of the first bearing is connected to the first connecting portion, and the outer ring of the first bearing is adapted to be connected to the first driving member;

[0015] A second bearing, the inner ring of the second bearing is connected to the second connecting portion, and the outer ring of the second bearing is adapted to be connected to the first driving member.

[0016] Optionally, the welding head structure further includes a first barrier member and a second barrier member for blocking the conduction of ultrasonic waves. The first barrier member is disposed between the inner ring of the first bearing and the first connecting portion, and the second barrier member is disposed between the inner ring of the second bearing and the second connecting portion.

[0017] Optionally, the material of the first barrier member includes a polymer composite material.

[0018] Optionally, the thickness of the welding roller is greater than or equal to 11 mm and less than or equal to 15 mm.

[0019] Optionally, the welding roller includes a roller body and a plurality of welding protrusions, and the plurality of welding protrusions are disposed on the outer peripheral surface of the roller body.

[0020] Optionally, the protruding height of the welding protrusion is greater than or equal to 0.25 mm and less than or equal to 0.6 mm.

[0021] Optionally, along the first direction, the width of the welding protrusion is greater than or equal to 0.5 mm and less than or equal to 1.2 mm, and the first direction is perpendicular to the protruding height direction of the welding protrusion.

[0022] Optionally, there is a gap between two adjacent welding protrusions.

[0023] Optionally, the gap between two adjacent welding protrusions is greater than or equal to 0.2 mm and less than or equal to 0.35 mm.

[0024] Optionally, the outer peripheral surface of the roller body includes a first part, a second part, and a third part arranged on one axial side of the welding roller; along the axial direction of the welding roller, the radial dimension of the second part remains unchanged;

[0025] Along the direction of the first part towards the second part, the radial dimension of the first part gradually increases; along the direction of the third part towards the second part, the radial dimension of the third part gradually increases.

[0026] Optionally, the included angle between the generatrix of the first part in the roller body and the end face of the roller body in the axial direction of the roller is greater than or equal to 70° and less than or equal to 85°.

[0027] Optionally, along the extending direction of the generatrix of the first part, the width of the first part is greater than or equal to 2 mm and less than or equal to 3.5 mm.

[0028] Optionally, along the axial direction of the welding roller, the width of the second part is greater than or equal to 5 mm and less than or equal to 8 mm.

[0029] In a second aspect, the present application provides a welding device including a welding head structure.

[0030] Optionally, the welding device further includes:

[0031] A supporting roller, which is arranged on one side of the welding roller along the radial direction of the welding roller;

[0032] A first driving member, the output shaft of the first driving member is connected to the welding head structure, and is used to drive the welding head structure to move towards or away from the supporting roller.

[0033] Optionally, the welding device further includes a support frame, the supporting roller is rotatably connected to the support frame, and the first driving member is connected to the support frame.

[0034] Optionally, the welding device further includes a second driving member and a transmission member, the transmission member is connected between the second driving member and the roller shaft of the welding head structure, and the second driving member is used to drive the roller shaft to rotate.

[0035] Optionally, the welding device further includes a third driving member, the third driving member is connected to the transmission member, and is used to drive the transmission member to move towards or away from the supporting roller along the radial direction of the welding roller.

[0036] Optionally, the welding device further includes a third bearing, the inner ring of the third bearing is connected to the transmission member, and the outer ring of the third bearing is connected to the third driving member.

[0037] Optionally, the welding device further includes an ultrasonic generator, which is connected to the transmission member and is used to generate ultrasonic waves and conduct the ultrasonic waves to the welding roller through the transmission member.

[0038] Optionally, the transmission member includes:

[0039] a transmission shaft, which is connected to the second driving member;

[0040] an amplitude modulator, which is connected between the transmission shaft and the roller shaft and is used to adjust the amplitude of the ultrasonic waves.

[0041] Optionally, the roller shaft includes a first balance bar and a second balance bar that are arranged at intervals along the axial direction of the roller shaft, and the welding roller is connected between the first balance bar and the second balance bar;

[0042] The ratio of the length of the first balance bar to the wavelength of the ultrasonic wave is greater than or equal to one-fifth and less than or equal to one-third; the ratio of the length of the second balance bar to the wavelength of the ultrasonic wave is greater than or equal to one-fifth and less than or equal to one-third.

[0043] It should be noted that for the technical effects brought by the implementation manners of the second aspect, reference can be made to the technical effects brought by the corresponding implementation manners in the first aspect, which will not be elaborated here. Description of the Drawings

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 is a schematic structural diagram of a welding device provided by an embodiment of the present application;

[0046] Figure 2 is Figure 1 a schematic structural diagram of the welding device in another perspective;

[0047] Figure 3 is Figure 1 a schematic enlarged view of a partial area A;

[0048] Figure 4 is Figure 2 a schematic structural diagram of a welding head;

[0049] Figure 5 is Figure 4 a schematic enlarged view of a partial area B;

[0050] Figure 6 Explosion structure schematic diagram of Figure 4 ;

[0051] Figure 7 Cross-sectional structure schematic diagram of Figure 4 ;

[0052] Figure 8 Enlarged view schematic diagram of local C in Figure 7 ;

[0053] Reference numerals:

[0054] 1a, the first driving member; 1b, the third driving member;

[0055] 2, welding roller; 21, connecting hole; 22, roller body; 22a, the first part; 22b, the second part; 22c, the third part; 23, welding protrusion;

[0056] 3, roller shaft; 31, the first balance bar; 32, the second balance bar; 33, the first connecting member; 311, the first connecting portion; 321, the second connecting portion;

[0057] 4a, the first bearing; 4b, the second bearing;

[0058] 5, retaining hoop; 6, the second barrier member; 7, supporting roller; [[ID=3(]]

[0059] 8, support frame; 81, upper layer plate; 82, vertical plate; 83, lower layer plate;

[0060] 9, transmission member; 91, transmission shaft; 92, amplitude modulator;

[0061] 11, ultrasonic generator. Specific embodiments

[0062] In the embodiments of the present application, the terms "first", "second", "third", "fourth", "fifth", "sixth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", "third", "fourth", "fifth", "sixth" may explicitly or implicitly include one or more of such features.

[0063] In the embodiments of the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising the element.

[0064] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0065] In the embodiments of the present application, "parallel", "perpendicular", and "equal" include the described situations and situations similar to the described situations, and the range of the similar situations is within an acceptable deviation range, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurements being discussed and the errors associated with the measurements of specific quantities (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, within 5° deviation; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, within 5° deviation. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range for approximate equality can be, for example, that the difference between the two equal ones is less than or equal to 5% of either one.

[0066] Roll welding is a type of welding method, which is mainly divided into ultrasonic roll welding, laser-assisted roll welding, electromagnetic pulse roll welding, etc. according to the energy assistance method. For the convenience of understanding, in this embodiment, ultrasonic roll welding is taken as an example to illustrate the structure of the welding head.

[0067] Ultrasonic roll welding is a solid-state welding technology that combines ultrasonic vibration and roll pressure. Its principle is to break the interface oxide film by high-frequency vibration friction and achieve bonding between materials under pressure. It can be applied to metal materials, such as the welding of soft metal foils or thin plates of aluminum, copper, nickel, etc., and is especially suitable for the connection of battery tabs; it can also be applied to non-metal materials, such as the lamination of plastic films.

[0068] In some examples, the roll welding device can be used for the welding of battery tabs. With the progress of charging technology, currently, there are higher and higher requirements for the welding width and welding rhythm of electric vehicle battery tabs, and the roll welding can achieve the welding of battery tabs with an ultra-wide weld mark area and ultra-high-speed charging.

[0069] In some embodiments, refer to Figure 2 , Figure 2 which is a schematic diagram of the structure of a welding device provided by the embodiments of the present application Figure 2, the welding device includes a welding head structure and a first driving member 1a. Among them, the first driving member 1a is used to drive the movement of the welding head structure.

[0070] In some examples, the first driving member 1a can be an electric push rod or a hydraulic push rod.

[0071] In some other examples, the first driving member 1a can be a cylinder.

[0072] In some embodiments, the welding device may further include a support roller 7. Along the radial direction of the welding roller 2, the support roller 7 is arranged on one side of the welding roller 2. The output shaft of the first driving member 1a is connected to the welding head structure and is used to drive the welding head structure to move towards or away from the support roller 7.

[0073] When welding a workpiece to be welded, such as a battery tab, with the welding device, the workpiece to be welded can be placed on the support roller 7, and then the first driving member 1a drives the welding head structure to move towards the support roller 7 until the welding head structure presses the workpiece to be welded against the support roller 7, and then the workpiece to be welded is welded by means of rolling.

[0074] In some embodiments, the welding head structure includes a welding roller 2 and a roller shaft 3, and the welding roller 2 is coaxially connected to the roller shaft 3. The roller shaft 3 includes a first connecting portion 311 and a second connecting portion 321 adapted to be connected to the first driving member 1a. Along the axial direction of the welding roller 2, the first connecting portion 311 is located on one side of the welding roller 2, and the second connecting portion 321 is located on the other side of the welding roller 2.

[0075] In some examples, the first connecting portion 311 and the second connecting portion 321 are integrally provided with the roller shaft 3. At this time, the first connecting portion 311 and the second connecting portion 321 are part of the roller shaft 3.

[0076] In some other examples, the first connecting portion 311 and the second connecting portion 321 are separately provided from the roller shaft 3. For example, the first connecting portion 311 and the second connecting portion 321 are connected to the roller shaft 3 by means of socketing or other connection methods. At this time, the first connecting portion 311 and the second connecting portion 321 can be plate-like structures, block-like structures, rod-like structures, etc. connected to the roller shaft 3.

[0077] In the above solution, the welding roller 2 is connected to the roller shaft 3. The first connecting portion 311 and the second connecting portion 321 of the roller shaft 3 are respectively located on both sides of the welding roller 2, and both the first connecting portion 311 and the second connecting portion 321 are used to connect the first driving member 1a. When the first driving member 1a drives the welding roller 2 to move, the first connecting portion 311 and the second connecting portion 321 respectively provide supporting forces for the welding roller 2 on both sides of the welding roller 2 through the roller shaft 3. In this way, when the welding roller 2 cooperates with the supporting roller to weld the workpiece to be welded, when the welding roller 2 is squeezed by the supporting roller 7, both sides of the welding roller 2 can be supported, so as to avoid the problem of warping and deformation caused by uneven force on the welding head structure, thereby ensuring that the welding roller 2 and the supporting roller 7 press the workpiece to be welded more tightly to improve the welding quality.

[0078] In some embodiments, referring to Figure 4 , the roller shaft 3 includes a first balance bar 31 and a second balance bar 32 that are arranged at intervals along the axial direction of the roller shaft 3, and the welding roller 2 is connected between the first balance bar 31 and the second balance bar 32. By connecting the welding roller 2 between the first balance bar 31 and the second balance bar 32, the welding roller 2 can be limited by the first balance bar 31 and the second balance bar 32 to avoid skewing of the welding roller 2 when it is squeezed, so as not to affect the cooperation effect between the welding roller 2 and the supporting roller 7, and to improve the welding quality.

[0079] Moreover, by connecting the welding roller 2 between the first balance bar 31 and the second balance bar 32, when the welding device is ultrasonic roller welding, ultrasonic waves can be conducted better between the first balance bar 31, the welding roller 2 and the second balance bar 32, thereby improving the welding quality.

[0080] In some examples, the first connecting portion 311 is arranged on the first balance bar 31, and the second connecting portion 321 is arranged on the second balance bar 32. By providing the first balance bar 31 and the second balance bar 32, and arranging the first connecting portion 311 and the second connecting portion 321 on the first balance bar 31 and the second balance bar 32 respectively, the two sides of the welding roller 2 can be supported, so that the forces on both sides of the welding roller 2 are uniform, preventing warping and deformation on one side.

[0081] In some examples, the welding roller 2 is fixedly connected between the first balance bar 31 and the second balance bar 32 by welding, screwing, clamping or other means.

[0082] In other examples, the welding roller 2 is clamped between the first balance bar 31 and the second balance bar 32, and the first balance bar 31 and the second balance bar 32 are connected by machine screw bolts.

[0083] In some other embodiments, the roller shaft 3 can also be a continuous shaft, and the welding roller 2 is sleeved on the outer side of the roller shaft 3 and connected to the roller shaft 3 by means of interference fit, screwing, welding or the like.

[0084] In some embodiments, referring to Figure 6 , the welding roller 2 is provided with a connection hole 21. The roller shaft 3 further includes a first connecting member 33. The first connecting member 33 passes through the connection hole 21 and is connected between the first balance bar 31 and the second balance bar 32. By passing the first connecting member 33 through the connection hole 21 and connecting the first balance bar 31 and the second balance bar 32, when assembling the welding head structure, it is only necessary to connect the first balance bar 31 and the second balance bar 32 through the first connecting member 33 to clamp the welding roller 2 between the first balance bar 31 and the second balance bar 32, so as to facilitate the connection of the first balance bar 31, the second balance bar 32 and the welding roller 2.

[0085] In some examples, the end face of the first balance bar 31 facing the welding roller 2 and the end face of the second balance bar 32 facing the welding roller 2 are both in contact with the welding roller 2. In this way, the end faces of the first balance bar 31 and the second balance bar 32 are in contact with the welding roller 2, which can increase the contact area between the welding roller 2 and the first connecting rod and the second connecting rod. When the welding device is ultrasonic roller welding, the conduction effect of ultrasonic and other auxiliary energies between the first balance bar 31, the welding roller 2 and the second balance bar 32 can be improved.

[0086] In some examples, the first connecting member 33 can be a connecting shaft. Through holes are provided in the first balance bar 31 and the second balance bar 32 at the same time. The first balance bar 31, the welding roller 2 and the second balance bar 32 are sequentially passed through the connecting shaft, and then fixed by locking members such as nuts provided at both ends of the connecting shaft.

[0087] In some other embodiments, referring to Figure 6 , the first connecting member 33 includes a first screw rod, and the first screw rod is connected to the first balance bar 31. The second balance bar 32 is provided with a first threaded hole, and the first screw rod is threadedly connected to the first threaded hole. The first balance bar 31 and the second balance bar 32 are connected by the first screw rod and the first threaded hole, and the structure is simple, which is convenient for processing and the connection of the first balance bar 31 and the second balance bar 32.

[0088] In some examples, the first screw rod and the first balance bar 31 are integrally provided, such as integrally formed by machining.

[0089] In some other examples, the first screw rod and the first balance bar 31 are separately provided and then connected by means of welding, clamping or screwing. For example, one end of the first screw rod is welded to the cross section of the first balance bar 31 facing the welding roller 2.

[0090] In some embodiments, referring toFigure 7 The first screw rod is a machine screw. The first balance rod 31 and the second balance rod 32 are connected by a machine screw. The machine screw has the advantages of strong anti-loosening ability and good vibration resistance, so that the connection strength and vibration resistance between the first balance rod 31 and the second balance rod 32 can be improved.

[0091] In some examples, threaded holes are respectively provided in the first balance rod 31 and the second balance rod 32. The first balance rod 31 and the second balance rod 32 are connected by a machine screw, and the welding roller 2 is clamped between the first balance rod 31 and the second balance rod 32. Compared with sleeving the welding roller 2 on the first balance rod 31 and / or the second balance rod 32, the welding roller 2 is more closely connected to the end faces of the first balance rod 31 and the second balance rod 32, which is more conducive to ultrasonic conduction.

[0092] It should be noted that when using the sleeved connection method, a clearance fit is generally required between the connection hole 21 of the welding roller 2 and the first balance rod 31 and the second balance rod 32. After the first balance rod 31 and / or the second balance rod 32 are sleeved with the welding roller 2, a gap will be formed at the connection surface, which is not conducive to the conduction of auxiliary energy such as ultrasonic waves.

[0093] In some embodiments, both the first balance rod 31 and the second balance rod 32 are in contact with the welding roller 2. For example, the end face of the first balance rod 31 facing the welding roller 2 and the end face of the second balance rod 32 facing the welding roller 2 are both in contact with the welding roller 2. By both the first balance rod 31 and the second balance rod 32 being in contact with the welding roller 2, it is ensured that the first balance rod 31 and the second balance rod 32 simultaneously provide a supporting force for the welding roller 2, so that the two sides of the welding roller 2 are evenly stressed and warping deformation is prevented.

[0094] In some embodiments, refer to Figure 2 The outer peripheral surface of the first balance rod 31 forms a first connection portion 311, and the outer peripheral surface of the second balance rod 32 forms a second connection portion 321. By setting the outer peripheral surface of the first balance rod 31 as the first connection portion 311 and the outer peripheral surface of the second balance rod 32 as the second connection portion 321, compared with setting other connecting parts, the structures of the first balance rod 31 and the second balance rod 32 can be simple and convenient for assembly.

[0095] In some other examples, the first connection portion 311 and the second connection portion 321 can be annular protrusions or annular grooves respectively provided on the first balance rod 31 and the second balance rod 32.

[0096] In some other examples, the first connecting portion 311 and the second connecting portion 321 may be connecting structures provided outside the balance bar. For example, the roller shaft 3 includes a continuous central shaft, and the first balance bar 31 and the second balance bar 32 are sleeved on the central shaft. At this time, the first connecting portion 311 and the second connecting portion 321 may be provided on the central shaft.

[0097] In some embodiments, the welding head structure further includes a first bearing 4a and a second bearing 4b. Among them, the inner ring of the first bearing 4a is connected to the first connecting portion 311, and the outer ring of the first bearing 4a is adapted to be connected to the first driving member 1a. The inner ring of the second bearing 4b is connected to the second connecting portion 321, and the outer ring of the second bearing 4b is adapted to be connected to the first driving member 1a. By providing the first bearing 4a and the second bearing 4b, the welding head structure is rotatably connected to the first driving member 1a. The structure is simple, which not only facilitates the first driving member 1a to drive the welding head structure to move, but also facilitates the roller shaft 3 to rotate to drive the welding roller 2 to rotate, so that the welding roller 2 welds the workpiece to be welded. And a bearing is provided on each of the first connecting portion 311 and the second connecting portion 321, so that the supporting forces on both sides of the welding roller 2 are balanced.

[0098] In some examples, referring to Figure 1 , the first bearing 4a and the second bearing 4b may be connected to the first driving member 1a through a hoop 5. Specifically, a connecting plate is provided on the output shaft of the first driving member 1a, and two connecting blocks are provided at intervals on the connecting plate. Each connecting block is connected to a hoop 5. One hoop 5 is connected to the outer ring of the first bearing 4a, and the other hoop 5 is connected to the outer ring of the second bearing 4b.

[0099] In some other examples, the first bearing 4a and the second bearing 4b may be respectively connected to bearing seats, and the output shaft of the first driving member 1a is bolted to the bearing seats of the first bearing 4a and the second bearing 4b respectively.

[0100] In some embodiments, referring to Figure 3 , the welding head structure further includes a first barrier member and a second barrier member 6 for blocking the conduction of ultrasonic waves. The first barrier member is provided between the inner ring of the first bearing 4a and the first connecting portion 311, and the second barrier member 6 is provided between the inner ring of the second bearing 4b and the second connecting portion 321. When the welding device is an ultrasonic roller welding, by providing the first barrier member between the inner ring of the first bearing 4a and the first connecting portion 311, the conduction of ultrasonic waves through the roller shaft 3 to the first bearing 4a is prevented or weakened; by providing the second barrier member 6 between the inner ring of the second bearing 4b and the second connecting portion 321, the conduction of ultrasonic waves through the roller shaft 3 to the second bearing 4b is prevented or weakened. Vibration during the rotation of the bearing is likely to cause damage to the bearing. By providing the first barrier member and the second barrier member 6, the interference of ultrasonic waves on the bearing is reduced or eliminated, and the service life of the bearing is prolonged.

[0101] In some examples, the first set of spacers may be a ring structure, and the first set of spacers extends circumferentially along the first bearing 4a. In other examples, the first barrier may also be a plurality of rod-shaped structures, block-shaped structures, etc. arranged circumferentially along the first bearing 4a.

[0102] In some examples, the structure and connection method of the second barrier 6 are the same as those of the first barrier, and will not be elaborated here.

[0103] In some embodiments, the material of the first barrier includes a polymer composite material. The polymer composite material has good ultrasonic barrier performance, effectively blocks ultrasonic waves from being conducted to the first bearing 4a and the second bearing 4b through the roller shaft 3, and prolongs the service life of the bearings.

[0104] In other examples, the material of the first barrier can be an asphalt damping material.

[0105] In some embodiments, referring to Figure 8 , the thickness of the welding roller 2 is greater than or equal to 11 mm and less than or equal to 15 mm. By setting welding rollers 2 with different thicknesses, the welding requirements of different welding materials can be met.

[0106] In some examples, the thickness b of the welding roller 2 can be 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc., and the welding roller 2 with the corresponding thickness can be selected according to the condition of the welding material.

[0107] In some embodiments, referring to Figure 5 , the welding roller 2 includes a roller body 22 and a plurality of welding protrusions 23, and the plurality of welding protrusions 23 are arranged on the outer peripheral surface of the roller body 22. By providing the welding protrusions 23 on the outer peripheral surface of the roller body 22, during the rotation of the welding roller 2, a greater pressure is provided at the welding protrusions 23, which easily breaks through the oxide film on the surface of the workpiece and promotes the welding between the welding materials, improving the welding quality.

[0108] In some examples, the shape of the welding protrusion 23 can be hemispherical, directional, conical, etc.

[0109] In some embodiments, the protruding height of the welding protrusion 23 is greater than or equal to 0.25 mm and less than or equal to 0.6 mm. According to factors such as the thickness of the welding material, welding protrusions 23 with different protruding heights can be selected. Generally, the greater the thickness of the welding material, the greater the height of the welding protrusion 23, which can effectively ensure that the welding protrusion 23 can pierce the oxide film on the surface of the welding material and improve the welding quality.

[0110] In some examples, referring to Figure 8, the protruding height h of the welding protrusion 23 can be 0.25 mm, 0.30 mm, 0.40 mm, 0.50 mm, 0.60 mm, etc.

[0111] In some embodiments, along the first direction, the width of the welding protrusion 23 is greater than or equal to 0.5 mm and less than or equal to 1.2 mm, and the first direction is perpendicular to the protruding height direction of the welding protrusion 23. Different widths of the welding protrusion 23 can be selected according to different welding materials to improve the welding quality.

[0112] In some examples, refer to Figure 8 , the width w of the welding protrusion 23 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, etc.

[0113] In some embodiments, there is a gap between two adjacent welding protrusions 23. By providing a gap between two adjacent welding protrusions 23, an uneven structure is formed. When the welding protrusions 23 of the welding roller 2 contact the surface of the welding material, it is easier to pierce the oxide layer on the welding surface and improve the welding quality.

[0114] In some specific examples, refer to Figure 8 , the gap s between two adjacent welding protrusions 23 is greater than or equal to 0.2 mm and less than or equal to 0.35 mm. Specifically, the gap s can be 0.2 mm, 0.3 mm, 0.35 mm, etc. The size of the gap value can be adjusted according to different protrusion shapes so that the welding protrusion 23 can more easily pierce the oxide layer on the welding surface and improve the welding quality.

[0115] In some embodiments, the outer peripheral surface of the roller body 22 includes a first portion 22a, a second portion 22b, and a third portion 22c arranged in sequence along the axial direction of the welding roller 2. Among them, along the axial direction of the welding roller 2, the radial dimension of the second portion 22b remains unchanged, that is, the second portion 22b is a cylindrical structure. Along the direction of the first portion 22a towards the second portion 22b, the radial dimension of the first portion 22a gradually increases. For example, the first portion 22a is a frustum-shaped structure. Along the direction of the third portion 22c towards the second portion 22b, the radial dimension of the third portion 22c gradually increases. For example, the third portion 22c is a frustum-shaped structure.

[0116] By setting the outer peripheral surface of the roller body 22 into three parts, where the second part 22b is in the middle, the first part 22a and the third part 22c are respectively on both sides of the second part 22b, and the diameters of the first part 22a and the third part 22c gradually decrease in the direction away from the second part 22b. In this way, when the welding device is an ultrasonic roller welding machine, when ultrasonic waves are conducted to the roller body 22, the vibration intensity in the middle area of the roller body 22 is basically the same as that in the two side areas.

[0117] In some embodiments, the included angle between the generatrix of the first part 22a in the roller body 22 and the end face of the roller body 22 in the axial direction of the roller is greater than or equal to 70° and less than or equal to 85°. When the included angle between the generatrix of the first part 22a and the end face of the roller body 22 in the axial direction of the roller is within the above range, it can ensure that the vibration intensity in the middle area of the roller body 22 is basically the same as that in the two side areas, and it can also enable the first part 22a, the second part 22b, and the third part 22c to all roll-press the workpiece to be welded, improving the welding quality.

[0118] In some examples, refer to Figure 8 , the included angle f between the generatrix of the first part 22a and the end face of the roller body 22 in the axial direction of the roller can be 70°, 75°, 80°, 85°, etc.

[0119] In this embodiment, the generatrix of the first part 22a in the roller body 22 is defined by referring to the generatrix definition method of a frustum of a cone.

[0120] It should be noted that the amplitude uniformity of the welding surface of the ultra-wide weld mark welding head structure is poor, and the amplitude in the middle is 15% to 25% smaller than that on both sides. The welding protrusions 23 of the welding head structure are designed in zones according to different amplitude regions. The middle region (i.e., the second part 22b) and the two side regions (i.e., the first part 22a and the second part 22b) are not on the same horizontal plane. The included angle between the two side regions and the middle region is designed according to the amplitude difference. For example, the middle region is perpendicular to the end face of the welding roller 2, and the included angle f between the two side regions and the end face of the welding roller 2 is 70° - 85°. The widths (i.e., width w), tooth heights (i.e., protruding height h), and tooth pitches (i.e., spacing s) of the welding protrusions 23 are designed to be the same in different zones, and the process of machining different angle planes is relatively simple. The middle and the two side texture regions are arranged at an included angle, forming a height difference on the welding working surface, which can ensure the strength of the middle region of the solder joint and at the same time ensure that the two sides of the solder joint will not be over-welded and cracked due to the amplitude difference. The included angle range f = 70° - 85° matches the amplitude difference range of 15% - 25%, which can ensure that the vibration intensity in the middle region is basically the same as that in the two side regions.

[0121] In some examples, the actual product participating in the subsequent laser welding process is the middle area of the pre-welded solder joint. As long as the strength of the middle area of the solder joint is sufficient, the two side areas are for shaping purposes, and as long as they are connected, the cutting will not disperse.

[0122] In some embodiments, along the extension direction of the generatrix of the first part 22a, the width of the first part 22a is greater than or equal to 2 mm and less than or equal to 3.5 mm. In this way, it can be ensured that the vibration intensity in the middle area of the roller body 22 is basically the same as that in the two side areas, and the width of the second part 22b is ensured to enable the second part 22b to better weld the workpiece to be welded.

[0123] In some examples, referring to Figure 8 , the width d of the first part 22a can be 2 mm, 2.5 mm, 3 mm, 3.5 mm, etc.

[0124] It should be noted that along the extension direction of its generatrix, the width of the third part 22c is the same as that of the first part 22a.

[0125] In some embodiments, along the axial direction of the welding roller 2, the width of the second part 22b is greater than or equal to 5 mm and less than or equal to 8 mm. The width of the second part 22b can be selected according to the width of the weld mark in the welding requirements to ensure the welding strength.

[0126] In some examples, referring to Figure 8 , the width a of the second part 22b of the welding roller 2 can be 5 mm, 6 mm, 7 mm, 8 mm, etc.

[0127] In some embodiments, referring to Figure 1 , Figure 2 , the welding device includes the welding head structure in any of the above embodiments. It also includes a support roller 7 and a first driving member 1a. Among them, along the radial direction of the welding roller 2, the support roller 7 is arranged on one side of the welding roller 2; the output shaft of the first driving member 1a is connected to the welding head structure for driving the welding head structure to move towards or away from the support roller 7. By providing the support roller 7, stable support is provided for the welding roller 2, which can prevent the welding material from deforming or moving during the welding process and improve the welding quality.

[0128] In some embodiments, referring to Figure 1 , Figure 2 , the welding device further includes a support frame 8. The support roller 7 is rotatably connected to the support frame 8, and the first driving member 1a is connected to the support frame 8.

[0129] In some examples, the support roller 7 is rotatably connected to the support frame 8 through a bearing.

[0130] In some examples, the support frame 8 includes a bottom plate, a vertical plate 82 and an upper plate 81, wherein the vertical plate 82 is connected between the bottom plate and the upper plate 81. An installation space is formed between the bottom plate and the upper plate 81 through the vertical plate 82, and the welding roller 2 and the support roller 7 are arranged in the installation space. Moreover, the first driving member 1a is connected to the upper plate 81, and the support roller 7 is rotatably connected to the lower plate 83.

[0131] In some embodiments, the welding device further includes a second driving member (not shown in the figure) and a transmission member 9. The transmission member 9 is connected between the second driving member and the roller shaft 3 of the welding head structure. The second driving member is used to drive the roller shaft 3 to rotate. The second driving member and the transmission member 9 drive the roller shaft 3 to rotate, so as to drive the welding roller 2 to rotate, realizing the rotary rolling of the welding material by the welding roller 2 and improving the welding quality.

[0132] In some examples, the second driving member may be a motor, and the transmission member 9 may be a coupling. The motor is connected to the roller shaft 3 through the coupling to drive the roller shaft 3 to rotate.

[0133] In other examples, the second driving member may be a pneumatic motor, and the transmission member 9 may be a synchronous belt mechanism. The pneumatic motor drives the roller shaft 3 to rotate through the synchronous belt mechanism.

[0134] In some embodiments, referring to Figure 2 , the welding device further includes a third driving member 1b. The third driving member 1b is connected to the transmission member 9 and is used to drive the transmission member 9 to move radially towards or away from the support roller 7 along the welding roller 2. The third driving member 1b supports the transmission member 9, increasing the stress nodes of the welding head structure, ensuring better stability of the welding head structure during high-speed operation, and preventing false soldering. Moreover, the transmission member 9 and the roller shaft 3 are driven by different driving members, realizing independent control of each pressing module and making the application more flexible.

[0135] In some examples, the third driving member 1b is a cylinder, and the movable end of the cylinder is rotatably connected to the transmission member 9 through a hoop 5 and a bearing.

[0136] In some embodiments, the welding device further includes a third bearing. The inner ring of the third bearing is connected to the transmission member 9, and the outer ring of the third bearing is connected to the third driving member 1b. The third driving member 1b and the transmission member 9 are rotatably connected through the third bearing, with a simple structure and ensuring smooth rotation of the transmission member 9.

[0137] Wherein, the connection structures between the third bearing and the third driving member 1b and between the third bearing and the transmission member 9 may be the same as the connection structure of the first driving member 1a, the first bearing 4a and the first connecting portion 311, which will not be elaborated here.

[0138] It should be noted that a third barrier member can be provided between the third bearing and the transmission member 9 to prevent or attenuate the transmission of ultrasonic waves through the power transmission member to the third bearing, thereby affecting the service life of the third bearing. The structure and material of the third barrier member can be the same as those of the first barrier member, and will not be elaborated here.

[0139] In some embodiments, referring to Figure 2 , the welding device further includes an ultrasonic generator 11. The ultrasonic generator 11 is connected to the transmission member 9 and is used to generate ultrasonic waves and transmit the ultrasonic waves through the transmission member 9 to the welding roller 2. Ultrasonic vibrations are generated by the ultrasonic generator 11 and transmitted through the transmission member 9 to the welding roller 2, causing the welding roller 2 to vibrate during the welding process, generating frictional heat at the welding site under high-frequency vibration, thereby increasing the temperature of the welding site, promoting the fusion of the welding materials, and improving the welding quality.

[0140] Compared with other vibrations, ultrasonic energy is only consumed in the precise area that needs to be welded, which is efficient and economical, while ensuring the stability and consistency of the welding points.

[0141] In some embodiments, referring to Figure 2 , the transmission member 9 includes a transmission shaft 91 and an amplitude modulator 92. Among them, the transmission shaft 91 is connected to the second driving member, and the amplitude modulator 92 is connected between the transmission shaft 91 and the roller shaft 3 and is used to adjust the amplitude of the ultrasonic waves. By providing the amplitude modulator 92, the vibration amplitude transmitted to the welding roller 2 through the amplitude modulator 92 is amplified to improve the welding quality.

[0142] In some examples, the amplitude modulator 92 can be made of titanium.

[0143] In some examples, both between the amplitude modulator 92 and the roller shaft 3 and between the amplitude modulator 92 and the transmission shaft 91 can be connected by machine screws. Other connection methods can also be used between the amplitude modulator 92 and the roller shaft 3 and between the amplitude modulator 92 and the transmission shaft 91, such as snap connection, welding, etc.

[0144] In some embodiments, the roller shaft 3 includes a first balance bar 31 and a second balance bar 32 that are arranged at intervals along the axial direction of the roller shaft 3, and the welding roller 2 is connected between the first balance bar 31 and the second balance bar 32. The ratio of the length of the first balance bar 31 to the wavelength of the ultrasonic wave is greater than or equal to one-fifth and less than or equal to one-third; the ratio of the length of the second balance bar 32 to the wavelength of the ultrasonic wave is greater than or equal to one-fifth and less than or equal to one-third. By controlling the lengths of the first balance bar 31 and the second balance bar 32, the position where the amplitude of the ultrasonic vibration is the largest is located at the position of the welding roller 2 to improve the welding quality.

[0145] In some examples, the length of the first balance bar 31 is one-third or one-fourth or one-fifth of the ultrasonic wavelength.

[0146] In some examples, the length of the second balance bar 32 is one-third or one-fourth or one-fifth of the ultrasonic wavelength.

[0147] In some examples, three equally spaced pin holes are machined on each of the first balance bar 31 and the second balance bar 32 for the installation or disassembly between the first balance bar 31 and the second balance bar 32.

[0148] In the description of the embodiments of the present application, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0149] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A welding head structure for roll welding, characterized in that, The roll welding includes a first driving member (1a) for driving the movement of the welding head structure; the welding head structure includes: A welding roller (2); A roller shaft (3), the welding roller (2) is coaxially connected to the roller shaft (3), the roller shaft (3) includes a first connecting portion (311) and a second connecting portion (321) adapted to connect to the first driving member (1a), along the axial direction of the welding roller (2), the first connecting portion (311) is located on one side of the welding roller (2), and the second connecting portion (321) is located on the other side of the welding roller (2).

2. The welding head structure according to claim 1, characterized in that The roller shaft (3) includes a first balance rod (31) and a second balance rod (32) spaced along the axial direction of the roller shaft (3), and the welding roller (2) is connected between the first balance rod (31) and the second balance rod (32).

3. The soldering head structure according to claim 2, wherein, The welding roller (2) is provided with a connection hole (21); The roller shaft (3) further includes a first connecting member (33), the first connecting member (33) passes through the connection hole (21) and is connected between the first balance rod (31) and the second balance rod (32).

4. The soldering head structure according to claim 3, characterized in that, The first connecting member (33) includes a first screw rod, and the first screw rod is connected to the first balance rod (31); The second balance rod (32) is provided with a first threaded hole, and the first screw rod is threadedly connected to the first threaded hole.

5. The soldering head structure according to claim 4, characterized in that, The first screw rod is a machine screw.

6. The soldering head structure according to any one of claims 2-5, characterized in that, Both the first balance rod (31) and the second balance rod (32) are in contact with the welding roller (2).

7. The soldering head structure according to any one of claims 2-5, characterized in that, The outer peripheral surface of the first balance rod (31) forms the first connecting portion (311), and the outer peripheral surface of the second balance rod (32) forms the second connecting portion (321).

8. The soldering head structure according to any one of claims 2-5, characterized in that Further included are: A first bearing (4a), the inner ring of the first bearing (4a) is connected to the first connecting portion (311), and the outer ring of the first bearing (4a) is adapted to connect to the first driving member (1a); A second bearing (4b), the inner ring of the second bearing (4b) is connected to the second connecting portion (321), and the outer ring of the second bearing (4b) is adapted to connect to the first driving member (1a).

9. The soldering head structure according to claim 8, wherein, Also included are a first barrier member and a second barrier member (6) for blocking the conduction of ultrasonic waves, the first barrier member is provided between the inner ring of the first bearing (4a) and the first connecting portion (311), and the second barrier member (6) is provided between the inner ring of the second bearing (4b) and the second connecting portion (321).

10. The soldering head structure according to claim 9, characterized in that, The material of the first barrier member includes a polymer composite material.

11. The soldering head structure according to any one of claims 2-5, characterized in that, The thickness of the welding roller (2) is greater than or equal to 11 mm and less than or equal to 15 mm.

12. The soldering head structure according to any one of claims 2-5, characterized in that, The welding roller (2) includes a roller body (22) and a plurality of welding protrusions (23), and the plurality of welding protrusions (23) are provided on the outer peripheral surface of the roller body (22).

13. The soldering head structure according to claim 12, wherein, The protruding height of the welding protrusion (23) is greater than or equal to 0.25 mm and less than or equal to 0.6 mm.

14. The soldering head structure according to claim 12, wherein, Along the first direction, the width of the welding projection (23) is greater than or equal to 0.5 mm and less than or equal to 1.2 mm, and the first direction is perpendicular to the protruding height direction of the welding projection (23).

15. The soldering head structure according to claim 12, wherein, There is a gap between two adjacent welding projections (23).

16. The soldering head structure according to claim 15, wherein, The gap between two adjacent welding projections (23) is greater than or equal to 0.2 mm and less than or equal to 0.35 mm.

17. The soldering head structure according to claim 12, wherein The outer peripheral surface of the roller body (22) includes a first part (22a), a second part (22b), and a third part (22c) arranged in sequence along the axial direction of the welding roller (2); along the axial direction of the welding roller (2), the radial dimension of the second part (22b) remains unchanged; Along the direction from the first part (22a) towards the second part (22b), the radial dimension of the first part (22a) gradually increases; along the direction from the third part (22c) towards the second part (22b), the radial dimension of the third part (22c) gradually increases.

18. The soldering head structure according to claim 17, wherein, The angle between the generatrix of the first part (22a) and the end face of the roller body (22) in the axial direction of the roller is greater than or equal to 70° and less than or equal to 85°.

19. The soldering head structure according to claim 17, characterized in that, Along the extending direction of the generatrix of the first part (22a), the width of the first part (22a) is greater than or equal to 2 mm and less than or equal to 3.5 mm.

20. The soldering head structure according to claim 17, wherein, Along the axial direction of the welding roller (2), the width of the second part (22b) is greater than or equal to 5 mm and less than or equal to 8 mm.

21. A welding device, characterized in that, Including the welding head structure according to any one of claims 1-20.

22. The welding device according to claim 21, characterized in that, Further comprising: A support roller (7), the support roller (7) is arranged on one side of the welding roller (2) along the radial direction of the welding roller (2); A first driving member (1a), an output shaft of the first driving member (1a) is connected to the welding head structure, and is used to drive the welding head structure to move towards or away from the support roller (7).

23. The welding device according to claim 22, wherein, Further comprising a support frame (8), the support roller (7) is rotatably connected to the support frame (8), and the first driving member (1a) is connected to the support frame (8).

24. The welding device according to claim 22, characterized in that, Further comprising a second driving member and a transmission member (9), the transmission member (9) is connected between the second driving member and the roller shaft (3) of the welding head structure, and the second driving member is used to drive the roller shaft (3) to rotate.

25. The welding device according to claim 24, characterized in that, Further comprising a third driving member (1b), the third driving member (1b) is connected to the transmission member (9), and is used to drive the transmission member (9) to move towards or away from the support roller (7) along the radial direction of the welding roller (2).

26. The welding device according to claim 25, characterized in that, Further comprising a third bearing, an inner ring of the third bearing is connected to the transmission member (9), and an outer ring of the third bearing is connected to the third driving member (1b).

27. The welding device according to claim 24, wherein, Further comprising an ultrasonic generator (11), the ultrasonic generator (11) is connected to the transmission member (9), and is used to generate ultrasonic waves and conduct the ultrasonic waves to the welding roller (2) through the transmission member (9).

28. The welding device according to claim 24, wherein The transmission member (9) includes: A transmission shaft (91), the transmission shaft (91) is connected to the second driving member; An amplitude modulator (92) is connected between the transmission shaft (91) and the roller shaft (3) for adjusting the amplitude of the ultrasonic wave.

29. The welding device according to claim 27, characterized in that, The roller shaft (3) includes a first balance rod (31) and a second balance rod (32) which are arranged at intervals along the axial direction of the roller shaft (3), and the welding roller (2) is connected between the first balance rod (31) and the second balance rod (32); The ratio of the length of the first balance rod (31) to the wavelength of the ultrasonic wave is greater than or equal to one-fifth and less than or equal to one-third; the ratio of the length of the second balance rod (32) to the wavelength of the ultrasonic wave is greater than or equal to one-fifth and less than or equal to one-third.

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