Electrode mechanism and seam welder

Abstract

The present invention relates to an electrode mechanism and a seam welder. The electrode mechanism includes a main shaft assembly, an electrode unit, a current conduction assembly, a connecting rod assembly, a first driving assembly, and a second driving assembly. The current conduction assembly is used to conduct current to the electrode unit. The electrode unit can rotate around the axial direction of the main shaft assembly following the main shaft assembly under the drive of the second driving assembly. The connecting rod assembly can push the electrode unit to rotate relative to the main shaft assembly with the radial direction of the main shaft assembly as the axis under the drive of the first driving assembly, so that the electrode unit is in a contracted or expanded state to change the size of the electrode unit in the radial direction of the main shaft assembly. Thus, when the electrode unit is in the contracted state, the size of the electrode unit in the radial direction of the main shaft assembly is much smaller than the size before adjustment, which facilitates the electrode mechanism to pass through the central circular holes of the end plate, the head plate, and the tail plate and enter the inside of the circular cage rib. Furthermore, when the electrode unit is in the expanded state, seam welding operations can be performed inside the circular cage rib.

Description

Technical Field

[0001] The present invention relates to the field of welding, and particularly to an electrode mechanism and a seam welder. Background Art

[0002] A seam welder is an important machine for forming the steel bar skeletons of cement products (such as drain pipes, pipe piles for high-rise buildings, and some chemical products). Because it can reliably weld circular cage bars with high efficiency, it is widely used in the fields of cement products and construction. The electrode mechanism of the seam welder is an essential part of the seam welder, and is used to weld the longitudinal steel bars distributed in the circumferential direction of the end plate and the circumferential steel bars introduced through the guide bar mechanism together.

[0003] The existing electrode mechanisms of seam welders are mostly disc electrode mechanisms. The disc electrode is a whole conductive electrode with a circular outer shape. Before seam welding, each longitudinal steel bar with upset heads at both ends passes through the bar-piercing disc in sequence and is attached to the outer surface of the disc electrode for welding. However, for end plates with different hole diameters, the existing disc electrodes have relatively large radial dimensions, and it is difficult to pass through the center holes of the end plate and the head and tail plates, so that the disc electrodes cannot weld on the inner circumference of the circular cage bars. Therefore, the existing disc electrodes can only be applied to the process of seam welding on the outer circumferential surface of the circular cage bars and cannot be applied to other pipe pile cage bar processes. Summary of the Invention

[0004] Based on this, in view of the problem that the diameter of the existing disc electrode is relatively large and it cannot pass through the center holes of the end plate, head plate and tail plate of the seam welder, so that it cannot weld on the inner circumference of the cage bars, it is necessary to provide an electrode mechanism with an adjustable outer diameter of the electrode.

[0005] According to one aspect of the present application, there is provided an electrode mechanism, including:

[0006] A main shaft assembly;

[0007] An electrode unit, movably connected to the main shaft assembly, and the electrode unit can rotate synchronously around the axis of the main shaft assembly following the main shaft assembly; and

[0008] A first driving assembly, connected to one end of the main shaft assembly away from the electrode unit and drivingly connected to the electrode unit;

[0009] The electrode unit can rotate around a direction perpendicular to the axis of the main shaft assembly under the drive of the first driving assembly, so as to change the dimension of the electrode unit in the radial direction of the main shaft assembly.

[0010] In one embodiment, the electrode unit includes a guiding plate and an electrode mounted at one end of the guiding plate. The guiding plate is in transmission connection with the first driving assembly, and the guiding plate rotates under the drive of the first driving assembly to switch the electrode unit between an unfolded state and a contracted state;

[0011] When the electrode unit is in the unfolded state, the electrode is located on one side in the radial direction of the main shaft assembly, and the size of the electrode unit in the radial direction of the main shaft assembly is at the maximum value; when the electrode unit is in the contracted state, the electrode is located on one side in the axial direction of the main shaft assembly, and the size of the electrode unit in the radial direction of the main shaft assembly is at the minimum value.

[0012] In one embodiment, the electrode mechanism further includes a connecting rod assembly. The connecting rod assembly is in transmission connection with the first driving assembly and the guiding plate, and the connecting rod assembly can drive the guiding plate to rotate around a direction perpendicular to the axial direction of the main shaft assembly under the push of the first driving assembly.

[0013] In one embodiment, the electrode unit further includes a fixing seat fixedly connected to the guiding plate. The fixing seat is fixedly provided with a first rotating shaft and a second rotating shaft at intervals along the length direction of the electrode unit. The first rotating shaft is rotatably connected to one end of the connecting rod assembly, and the second rotating shaft is rotatably connected to one end of the main shaft assembly away from the first driving assembly. The first rotating shaft can rotate with the second rotating shaft as the rotation axis to make the electrode located on one side in the radial direction or the axial direction of the main shaft assembly.

[0014] In one embodiment, the position where the guiding plate is mounted on the fixing seat can be changed along the length direction of the guiding plate, so that the size of the electrode unit in the radial direction of the main shaft assembly is adjustable.

[0015] In one embodiment, the electrode unit further includes a positioning element limited in the installation gap between the guiding plate and the fixing seat; one end of the guiding plate close to the positioning element has multiple groups of key groove groups distributed at intervals along the length direction. Each group of key groove groups includes multiple key grooves distributed at intervals. One end of the positioning element close to the guiding plate has a group of keys. One group of keys has multiple keys distributed at intervals. The number of keys in one group of keys is less than the number of key grooves in one group of key groove groups. One group of keys of the positioning element can be selectively engaged with any group of key groove groups of the guiding plate, so that each key is respectively inserted into a key groove.

[0016] In one embodiment, an elastic element is mounted at one end of the fixed seat along the length direction of the guide plate and away from the electrode, so that the electrode can elastically retract after being subjected to an external force.

[0017] In one embodiment, the main shaft assembly includes an outer shaft and an inner shaft. The outer shaft has a central hole coaxial with itself. The inner shaft is partially fitted to the outer shaft, and one end of the inner shaft is received in the central hole of the outer shaft. The electrode mechanism further includes a second driving assembly. The outer shaft is connected to the second driving assembly. One end of the inner shaft away from the outer shaft is connected to the first driving assembly. The inner shaft can move linearly back and forth relative to the outer shaft along the axial direction of the outer shaft and / or rotate synchronously with the outer shaft under the action of the first driving assembly and / or the second driving assembly.

[0018] In one embodiment, a stroke groove is formed in the shaft body of the outer shaft. The stroke groove communicates with the central hole. One end of the connecting rod assembly passes through the stroke groove and is connected to the end of the inner shaft received in the central hole. The length direction of the stroke groove is parallel to the axial direction of the outer shaft. The connecting rod assembly can move linearly back and forth along the length direction of the stroke groove following the inner shaft.

[0019] According to another aspect of the present application, a seam welder is provided, including the above-mentioned seam welding electrode mechanism.

[0020] In the above electrode mechanism, by movably fitting the electrode unit to the main shaft assembly and providing two different driving assemblies to respectively control the movement of the electrode unit relative to the main shaft unit and the rotation of the main shaft assembly, the electrode unit of the electrode mechanism can not only be in a contracted or expanded state to change the size of the electrode unit in the radial direction of the main shaft assembly, so that when the electrode unit is in a contracted state, the size of the electrode mechanism in the radial direction of the main shaft assembly is much smaller than the size before adjustment, which is convenient for the electrode mechanism to pass through the central circular holes of the end plate, the head plate and the tail plate and enter the inside of the circular cage reinforcement, but also can make the electrode unit rotate around the circumferential direction of the circular cage reinforcement for seam welding operation when in an expanded state. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only one embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 A three-dimensional schematic diagram of the electrode mechanism provided for the embodiment of the present invention;

[0023] Figure 2 Another perspective three-dimensional schematic diagram of the electrode mechanism provided by the embodiment of the present invention;

[0024] Figure 3 Front view of the electrode unit in the electrode mechanism provided by the embodiment of the present invention when it is in the deployed state;

[0025] Figure 4 Left view of the electrode unit in the electrode mechanism provided by the embodiment of the present invention when it is in the deployed state;

[0026] Figure 5 Front view of the electrode unit in the electrode mechanism provided by the embodiment of the present invention when it is in the contracted state;

[0027] Figure 6 Left view of the electrode unit in the electrode mechanism provided by the embodiment of the present invention when it is in the contracted state;

[0028] Figure 7 is Figure 5 Cross-sectional view in the A-A direction of;

[0029] Figure 8 is Figure 3 Enlarged schematic diagram of area B in;

[0030] Figure 9 is Figure 1 Enlarged schematic diagram of area C in;

[0031] Figure 10 is Figure 1 Enlarged schematic diagram of area D in. Detailed implementation manners

[0032] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will combine the accompanying drawings to make a detailed description of the specific implementation manners of the present invention. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0037] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0038] Combined with Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a welding device (not shown in the figure), and the welding device includes an electrode mechanism 10, and the electrode mechanism 10 is used to provide an electrode 410 during the cage bar roll welding and provide stable support for another electrode rotating around the electrode 410.

[0039] Taking the welding device as a roll welding machine as an example below, the structure of the electrode mechanism 10 in the present application will be described. This embodiment is only used as an example for illustration and will not limit the technical scope of the present application. It can be understood that in other embodiments, the welding device can also be specifically other devices equipped with the electrode mechanism 10 of the present application, which is not limited herein.

[0040] As Figure 1 and Figure 2 The electrode mechanism 10 shown includes a fixed support 100, a main shaft assembly 200, a connecting rod assembly 300, an electrode unit 400, a first driving assembly 500, a second driving assembly 600 and a current conduction assembly 700. The main shaft assembly 200 is installed on the fixed support 100, and one end of the main shaft assembly 200 is the welding end of the electrode mechanism 10. The electrode unit 400 is movably connected to the welding end of the main shaft assembly 200 and is used to provide an electrode 410 for the roll welding operation. One end of the connecting rod assembly 300 is movably connected to the electrode unit 400, and the other end is movably connected to the main shaft assembly 200; the first driving assembly 500 and the second driving assembly 600 are respectively connected to the main shaft assembly 200. The first driving assembly 500 is used to control the movement of the connecting rod assembly 300 so that the connecting rod assembly 300 can drive the electrode unit 400 to move relative to the main shaft assembly 200, and the second driving assembly 600 is used to drive the main shaft assembly 200 to rotate along its own axis direction. The current conduction assembly 700 is installed on the main shaft assembly 200 and is electrically connected to the electrode unit 400 for conducting the external current to the electrode unit 400.

[0041] Driven by the second driving component 600, the main shaft component 200 can rotate around its own axial direction, thereby driving the connecting rod component 300 and the electrode unit 400 to rotate along with the main shaft component 200 itself, enabling the electrode unit 400 to perform seam welding operations around the circular cage bars with the axial direction of the main shaft component 200 as the rotation axis. Driven by the first driving component 500, the connecting rod component 300 can push the electrode unit 400 to rotate relative to the main shaft component 200 around a direction perpendicular to the axial direction of the main shaft component 200, so that the electrode unit 400 is in a contracted or expanded state to change the size of the electrode unit 400 in the radial direction of the main shaft component 200. When the electrode unit 400 is in the expanded state, the size of the electrode unit 400 in the radial direction of the main shaft component 200 is at the maximum value, and when the electrode unit 400 is in the contracted state, the size of the electrode unit 400 in the radial direction of the main shaft component 200 is at the minimum value.

[0042] When the size of the electrode unit 400 in the radial direction of the main shaft component 200 is at the minimum value, the electrode mechanism 10 can conveniently pass through the central circular holes of the end plate, head plate and tail plate of the seam welder and enter the interior of the circular cage bars, so that the circular cage bars are coaxially sleeved on the outer periphery of the main shaft component 200 of the electrode mechanism 10; when the size of the electrode unit 400 in the radial direction of the main shaft component 200 is at the maximum value, the electrode unit 400 can perform seam welding operations around the circular cage bars while rotating around the main shaft component 200.

[0043] Please continue to refer to Figure 1 and Figure 2 , in some embodiments, the fixed support 100 is used to provide support for the electrode mechanism 10. The fixed support 100 includes a bottom plate 110, a support plate 120 and a seat sleeve 130. Among them, the bottom of the support plate 120 is installed on the bottom plate 110, and the height of the support plate 120 depends on the height at which the cage bars are installed on the seam welder. The seat sleeve 130 is installed on the top plate of the support plate 120. The seat sleeve 130 has a cylindrical structure and has a through hole communicating the head and tail ends. In this way, the main shaft component 200 passes through the through hole of the seat sleeve 130 to be installed on the fixed support 100. The middle part of the main shaft component 200 along the length direction is received in the through hole of the seat sleeve 130, and both ends of the main shaft component 200 are exposed outside the seat sleeve 130.

[0044] The second driving component 600 includes a three-phase frequency conversion motor. The top of the second driving component 600 is fixedly installed below the fixed support 100, and the bottom of the second driving component 600 is fixedly installed on a certain plane, which can be the ground or a certain plane of the seam welder.

[0045] In some embodiments, the bottom plate 110 and the support plate 120 of the fixed support 100, as well as the housing of the second driving component 600, are all made of insulating materials, and the fixed support 100 and the second driving component 600 also remain insulated after being installed together to ensure the use safety.

[0046] In some embodiments, as Figure 7 shown, the main shaft assembly 200 includes a bushing 210, an outer shaft 220, an inner shaft 230, a sleeve 240, and a conductive disk 250. The bushing 210 is received in the through hole of the seat sleeve 130 and abuts against the seat sleeve 130 at one end. The bushing 210 has a through hole coaxial with itself, and a bearing is installed at each end of the through hole of the bushing 210. The outer shaft 220 is inserted into the through hole of the bushing 210 and is mated with the bearings in the bushing 210. A sprocket 260 is installed at one end of the outer shaft 220 extending out of the bushing 210. The sprocket 260 is connected to the output shaft of the second drive assembly 600 through a chain. The outer shaft 220 has a central hole coaxial with itself. The sleeve 240 is coaxially installed in the central hole of the outer shaft 220 by interference fit. One end of the sleeve 240 is exposed outside the outer shaft 220. The sleeve 240 has a through hole coaxial with itself. The conductive disk 250 is sleeved on one end of the sleeve 240 exposed outside the outer shaft 220. The conductive disk 250 is used to connect the current conduction assembly 700 to conduct current. The outer diameter of the conductive disk 250 is larger than the outer diameter of the sleeve 240. One end of the inner shaft 230 penetrates into the through hole of the sleeve 240 and is mated with the outer shaft 220. Driven by the second drive assembly 600, the bushing 210, the outer shaft 220, the sleeve 240, the inner shaft 230, and the conductive disk 250 of the main shaft assembly 200 can all rotate synchronously around their own axial directions.

[0047] In some embodiments, one end of the inner shaft 230 of the main shaft assembly 200 away from the outer shaft 220 is connected to the first drive assembly 500. The first drive assembly 500 is preferably a cylinder. The output shaft of the first drive assembly 500, that is, one end of the piston, is connected to one end of the inner shaft 230 away from the outer shaft 220, so that when the piston of the cylinder makes a reciprocating linear motion, it can also push the inner shaft 230 to make a reciprocating motion along the axial direction of the central hole of the outer shaft 220. Specifically, one end of the inner shaft 230 away from the outer shaft 220 is connected to the output shaft of the first drive assembly 500 through two thrust ball bearings. One thrust ball bearing is connected to the piston rod of the first drive assembly 500, and the other thrust ball bearing is connected to one end of the inner shaft 230, so that the inner shaft 230 can make a reciprocating motion along the axial direction of the outer shaft 220 while also rotating synchronously with the outer shaft 220.

[0048] A connecting rod assembly 300 and an electrode unit 400 are also installed at one end of the outer shaft 220 away from the first drive assembly 500. In some embodiments, as Figure 7As shown, a travel groove 221 parallel to the axial direction of the outer shaft 220 is provided on the shaft body of the outer shaft 220. The travel groove 221 communicates with the central hole of the outer shaft 220. One end of the connecting rod assembly 300 is rotatably connected to one end of the inner shaft 230 away from the first driving assembly 500, and the other end of the connecting rod assembly 300 is movably connected to the electrode unit 400.

[0049] Please refer to Figure 7 and Figure 8 , specifically, in some embodiments, the connecting rod assembly 300 includes a guide rod 310, a connecting rod intermediate shaft 320, and an eccentric crank 330. One end of the guide rod 310 is fixedly connected to one end of the eccentric crank 330, the other end of the guide rod 310 is rotatably connected to one end of the connecting rod intermediate shaft 320, and the other end of the connecting rod intermediate shaft 320 passes through the travel groove 221 and enters the central hole of the outer shaft 220 to be connected to one end of the inner shaft 230 located in the central hole of the outer shaft 220. At the same time, the other end of the eccentric crank 330 is preferably hinged to the electrode unit 400.

[0050] In some embodiments, as Figure 2 , Figure 8 and Figure 9 shown, the electrode unit 400 includes an electrode 410, an electrode seat 420, a guide plate 430, and a fixing seat 440. Specifically, in a preferred embodiment, the electrode 410 is used to contact the cage bars and for seam welding. One end of the electrode 410 has an arc-shaped structure, and the other end of the electrode 410 is fixedly connected to one end in the length direction of the guide plate 430. The side of the guide plate 430 away from the electrode 410 is fixedly connected to the fixing seat 440. The fixing seat 440 is fixedly provided with a first rotating shaft 480 and a second rotating shaft (not shown in the figure) at intervals along the length direction of the electrode unit 400. The first rotating shaft 480 is preferably hinged to the eccentric crank 330 of the connecting rod assembly 300, and the second rotating shaft is rotatably connected to one end of the main shaft assembly 200 away from the first driving assembly 500. The electrode seat 420 is installed at one end of the main shaft assembly 200 close to the electrode unit 400 and contacts the electrode 410 for transmitting current to the electrode 410; the first rotating shaft 480 can rotate with the second rotating shaft as the rotation axis.

[0051] In this way, when the output end of the first driving assembly 500 makes a pushing action along the axial direction of the main shaft assembly 200, one end of the guide rod 310 of the connecting rod assembly 300 can move along the travel groove 221 of the outer shaft 220 in the main shaft assembly 200, and drive the eccentric crank 330 to push the fixing seat 440 so that the fixing seat 440 rotates 90 degrees around the rotating shaft. When the fixing seat 440 rotates 90 degrees, the guide plate 430 and the electrode 410 mounted on the fixing seat 440 both rotate 90 degrees together.

[0052] Through the above actions, the electrode unit 400 can be in a contracted state, as Figure 5 andFigure 6 As shown, when viewed axially from the main shaft assembly 200, the size of the rotated electrode unit 400 in the radial direction of the main shaft assembly 200 is greatly reduced. At this time, the electrode 410 is located on one side in the axial direction of the main shaft assembly 200, and the size of the electrode unit 400 in the radial direction of the main shaft assembly 200 is at the minimum value, so that it is convenient for the electrode mechanism 10 to extend into the interior of the circular cage rib through the central holes of the end plate, head plate and tail plate of the seam welder to perform seam welding operations inside or extend from the interior of the circular cage rib to the outside.

[0053] In some embodiments, as Figure 3 and Figure 8 shown, the electrode unit 400 further includes a limit seat 450. The limit seat 450 is connected to the fixed seat 440 and can move together with the fixed seat 440, the guide plate 430 and the electrode 410, and is used to enable the electrode unit 400 to rotate to an accurate preset position.

[0054] In this way, when the electrode unit 400 rotates from 0 degrees to 90 degrees to be in a contracted state or an expanded state, it can ensure that the electrode unit 400 has an accurate rotation angle.

[0055] In some embodiments, as Figure 9 shown, a plurality of oblong holes 431 are also spaced apart along the length direction of the guide plate 430. The fixed seat 440 can be selectively limited in one of the oblong holes 431 by a fixing member, so that the installation position of the guide plate 430 along its own length direction and the fixed seat 440 can be changed. When the fixed seat 440 is limited in different oblong holes 431, the electrode unit 400 has different sizes in the radial direction of the main shaft assembly 200.

[0056] In this way, the size of the electrode unit 400 in the radial direction of the main shaft assembly 200 can be adjusted, so that the size of the electrode unit 400 in the radial direction of the main shaft assembly 200 corresponds to the diameters of circular cage ribs of different specifications, so that the electrode mechanism 10 of the seam welder can perform seam welding operations on circular cage ribs of a variety of different diameters.

[0057] In some embodiments, as Figure 9As shown, the electrode unit 400 further includes a positioning element 460. The positioning element 460 is limited in the installation gap between the guide plate 430 and the fixed seat 440 by a fixing member. One end of the guide plate 430 close to the positioning element 460 has multiple groups of keyway groups distributed at intervals along the length direction. Each group of keyway groups includes multiple keyways 432 distributed at intervals. One end of the positioning element 460 close to the guide plate 430 has a group of keys. The group of keys has multiple keys 461 distributed at intervals, and the number of the group of keys is less than the number of the keyways 432 in one group of keyway groups in the positioning element 460. One group of keys can be selectively engaged with any group of keyway groups of the guide plate 430, so that each key 461 is respectively engaged with a keyway 432.

[0058] In this way, by providing multiple groups of keyway groups and setting the number of keyways 432 in one group of keyway groups to be greater than the number of keys 461 in one group of keys, one group of keys can be selectively engaged with different groups of keyway groups, and the keys 461 in one group of keys can also be engaged with the keyways 432 at different positions in one group of keyway groups. Thus, the position where the guide plate 430 is limited to the positioning element 460 can be finely adjusted along the length direction of the guide plate 430, so that the size of the electrode unit 400 in the radial direction of the spindle assembly 200 can be slightly adjusted. At the same time, it cooperates with the slight stroke adjustment of the fixing member in the waist-shaped hole 431 to supplement the diameter of the worn electrode 410. In this way, the problem that the existing copper electrode wears quickly and needs to be frequently replaced can be overcome, and the durability of the electrode 410 can be greatly enhanced, and the service life can be extended.

[0059] In some embodiments, as Figure 10 shown, an elastic element 470, preferably a spring assembly, is further installed at one end of the fixed seat 440 of the electrode unit 400 away from the electrode 410. It can provide a small elastic movement space, prevent the electrode 410 from colliding with the cage bars during the rotary spot welding operation, and can elastically retract and avoid.

[0060] In some embodiments, as Figure 2 shown, the current conduction assembly 700 includes an external conductive busbar 710, a conduction module 720, and an intermediate conductive busbar 730; the external conductive busbar 710, the conduction module 720, and the intermediate conductive busbar 730 are all installed on the fixed support 100, and the external conductive busbar 710 is preferably electrically connected to the conduction module 720 through a flexible copper strip. The conduction module 720 is electrically connected to the intermediate conductive busbar 730 through the spindle assembly 200, and the intermediate conductive busbar 730 is also preferably electrically connected to the electrode seat 420 through a flexible copper strip, so as to conduct the external current to the electrode 410.

[0061] In some embodiments, as Figure 10As shown, the conduction module 720 includes a conductive plate 721, support columns 722, and carbon brushes 723. The conductive plate 721 preferably has a plate-like structure and is fixedly provided on the fixed support 100. The support columns 722 are preferably multiple cylindrical rod-like structures, arranged at intervals along a circular arc direction at a certain angle and surrounding the inner shaft 230 of the main shaft assembly 200. One end of each support column 722 is fixedly provided on the conductive plate 721, and the other end is connected to the carbon brush 723. Therefore, the carbon brushes 723 also correspond to multiple ones, and correspondingly elastically contact the conductive disk 250 of the main shaft assembly 200 at intervals along the circular arc direction. The arrangement of the carbon brushes 723 distributed at intervals along the circular arc direction facilitates user operation and observation. In this way, through the above arrangement, the low-voltage and high-current required by the electrode 410 are introduced by the external conductive busbar 710 and then conducted to the rotating conductive disk 250 and the sleeve 240 through the conduction module 720, and then conducted to the intermediate conductive busbar 730, and then conducted to the electrode seat 420 through the flexible copper strip, and finally conducted to the electrode 410.

[0062] In some embodiments, the conduction module 720 further includes a carbon brush guiding and fixing frame 724, multiple compression springs 725, and a pressing adjustment screw 726. The carbon brush guiding and fixing frame 724 has a polygonal strip-like structure and simultaneously surrounds and is fixedly connected to the multiple support columns 722, and is used to keep the multiple support columns 722 fixed to prevent the multiple support columns 722 from spreading when the outer shaft 220 rotates and rubs against the carbon brushes 723, which may affect current conduction. The multiple compression springs are installed between the conductive disk 250 and the conductive plate 721. The pressing adjustment screw 726 is used to press and install the compression springs 725. The compression springs 725 can tightly press the carbon brushes 723 against the conductive disk 250 by means of the spring force, so that the current can be fully conducted into the rotating conductive disk 250 and the sleeve 240.

[0063] For the above electrode mechanism, when performing seam welding operations, the electrode unit 400 needs to be in an unfolded state. At this time, the output end of the first driving assembly 500 performs a pulling-back action in the opposite direction. One end of the guide rod 310 of the link assembly 300 returns in the opposite direction along the travel groove 221 of the outer shaft 220 in the main shaft assembly 200, and drives the eccentric rotating handle 330 to pull the fixed seat 440 so that the fixed seat 440 rotates 90 degrees in the opposite direction around the rotating shaft and returns to the initial position. Through the above actions, the electrode unit 400 can return to the unfolded state again, as Figure 3 and Figure 4As shown, when observing from the axial direction of the main shaft assembly 200 at this time, the electrode 410 is located on one side in the radial direction of the main shaft assembly 200, and the size of the electrode unit 400 in the radial direction of the main shaft assembly 200 is at the maximum value. At this time, the size of the electrode unit 400 in the radial direction of the main shaft assembly 200 is spatially suitable for serving as the pressure support on the corresponding type of cage bar resistance welding and as the negative electrode. The second driving assembly 600 starts to operate, driving the main shaft assembly 200 to rotate around its own axial direction, thereby driving the guide rod 310, eccentric rotating handle 330, fixed seat 440, guide plate 430, and electrode 410 installed on the main shaft assembly 200 to rotate together, enabling the electrode 410 to rotate around the circular cage bar as the negative electrode for seam welding operation. In some embodiments, the angular velocity of the rotation of the main shaft assembly 200 is matched with the rotation speed of the positive electrode medium through an encoder, so that the electrode 410 can accurately weld at the preset position of the circular cage bar.

[0064] In this way, after the electrode unit 400 rotates by 90 degrees, the size of the electrode unit 400 in the radial direction of the main shaft assembly 200 in the electrode mechanism 10 can be changed from a large size to a small size, so as to meet the requirement that the electrode mechanism 10 passes through the central through holes of the end plate, head plate, and tail plate of the circular cage bar, and uses the principle of resistance welding to provide a large-pressure support inside the circular cage bar while serving as the negative electrode to ensure the quality of the welded product.

[0065] It should be noted that although the electrode unit 400 of the above-mentioned electrode mechanism 10 can contract, thereby reducing the size of the electrode unit in the radial direction of the main shaft assembly so that the electrode mechanism 10 can pass through the central holes of the end plate and the head and tail plates of the circular cage bar and enter the inside of the circular cage bar for seam welding operation, it can also perform seam welding operation outside the circular cage bar, which is not limited herein.

[0066] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0067] The above-described embodiments only represent one implementation manner of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electrode mechanism, characterized in that, Including: A main shaft assembly, an electrode unit, a first driving assembly, and a connecting rod assembly. The electrode unit is movably connected to the main shaft assembly, and the electrode unit can synchronously rotate around the axial direction of the main shaft assembly following the main shaft assembly. The first driving assembly is connected to one end of the main shaft assembly away from the electrode unit and is drivingly connected to the electrode unit. The electrode unit includes a guide plate, an electrode installed at one end of the guide plate, and a fixed seat fixed to the guide plate. The fixed seat is fixedly provided with a first rotating shaft and a second rotating shaft at intervals along the length direction of the electrode unit. The first rotating shaft is hinged to one end of the connecting rod assembly, and the other end of the connecting rod assembly is drivingly connected to the first driving assembly. The second rotating shaft is rotatably connected to one end of the main shaft assembly away from the first driving assembly. The first rotating shaft can rotate around the second rotating shaft under the drive of the first driving assembly and drive the guide plate to rotate around a direction perpendicular to the axial direction of the main shaft assembly, so as to change the dimension of the electrode unit in the radial direction of the main shaft assembly, thereby switching the electrode unit between an unfolded state and a contracted state. When the electrode unit is in the unfolded state, the electrode is located on one side in the radial direction of the main shaft assembly, and the dimension of the electrode unit in the radial direction of the main shaft assembly is at the maximum value. When the electrode unit is in the contracted state, the electrode is located on one side in the axial direction of the main shaft assembly, and the dimension of the electrode unit in the radial direction of the main shaft assembly is at the minimum value.

2. The electrode mechanism according to claim 1, characterized in that, The connecting rod assembly includes a guide rod, a connecting rod intermediate shaft, and an eccentric rotating handle. One end of the guide rod is fixedly connected to one end of the eccentric rotating handle, the other end of the guide rod is rotatably connected to one end of the connecting rod intermediate shaft, the other end of the connecting rod intermediate shaft is connected to the first driving assembly, and the other end of the eccentric rotating handle is hinged to the electrode unit.

3. The electrode mechanism according to claim 1, wherein, The position where the guide plate is installed on the fixed seat can be changed along the length direction of the guide plate, so that the dimension of the electrode unit in the radial direction of the main shaft assembly is adjustable.

4. The electrode mechanism according to claim 3, characterized in that, The electrode unit further includes a positioning element, and the positioning element is limited in the installation gap between the guide plate and the fixed seat. One end of the guide plate close to the positioning element has multiple groups of key groove groups distributed at intervals along the length direction. Each group of key groove groups includes multiple key grooves distributed at intervals. One end of the positioning element close to the guide plate has a group of keys. One group of keys has multiple keys distributed at intervals. The number of keys in one group of keys is less than the number of key grooves in one group of key groove groups. One group of keys of the positioning element can be selectively engaged with any group of key groove groups of the guide plate, so that each key is respectively inserted into one key groove.

5. The electrode mechanism according to claim 4, characterized in that, An elastic element is installed at one end of the fixed seat along the length direction of the guide plate and away from the electrode, so that the electrode can elastically retract after being acted by an external force.

6. The electrode mechanism according to claim 3, characterized in that, The guiding plate is also provided with a plurality of oblong holes at intervals along its own length direction, and the fixing seat can be selectively limited in one of the oblong holes by a fixing member. When the fixing seat is limited in different oblong holes, the electrode unit has different dimensions in the radial direction of the main shaft assembly.

7. The electrode mechanism according to claim 1, wherein The electrode unit further includes a limiting seat, and the limiting seat is connected to the fixing seat and can move together with the fixing seat, the guiding plate and the electrode, so as to enable the electrode unit to rotate to an accurate preset position.

8. The electrode mechanism according to claim 1, wherein The main shaft assembly includes an outer shaft and an inner shaft. The outer shaft has a central hole coaxial with itself. The inner shaft is partially fitted to the outer shaft, and one end of the inner shaft is received in the central hole of the outer shaft. The electrode mechanism further includes a second driving assembly. The outer shaft is connected to the second driving assembly, and one end of the inner shaft away from the outer shaft is connected to the first driving assembly. The inner shaft can make a linear reciprocating motion relative to the outer shaft along the axial direction of the outer shaft and / or rotate synchronously with the outer shaft under the action of the first driving assembly and / or the second driving assembly.

9. The electrode mechanism according to claim 8, wherein, A stroke groove is formed in the shaft body of the outer shaft, and the stroke groove communicates with the central hole. One end of the connecting rod assembly passes through the stroke groove and is connected to one end of the inner shaft received in the central hole. The length direction of the stroke groove is parallel to the axial direction of the outer shaft, and the connecting rod assembly can make a reciprocating linear motion along the length direction of the stroke groove following the inner shaft.

10. A seam welder, characterized in that, Comprising the electrode mechanism according to any one of claims 1 to 9.

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