Multi-point stud welding all-in-one machine

Abstract

The invention is suitable for the technical field of welding equipment, and provides a multi-point stud welding all-in-one machine which comprises a welding mechanical arm, a welding table, a connecting sleeve, a welding frame, a welding gun and an assembling mechanism and further comprises an exchange mechanism, a regulation and control mechanism and a limiting mechanism, the exchange mechanism comprises an exchange frame and a sliding assembly, and the exchange frame is composed of a left Z-shaped frame, a right Z-shaped frame and a U-shaped frame; the exchange mechanism is matched with the regulation and control mechanism and the limiting mechanism, so that the welding guns on the exchange mechanism can be driven to move downwards to the welding original point position accurately in a staggered mode, the staggered state that a single welding gun works and multiple welding guns are standby is formed, rapid welding of different studs can be achieved, the continuous welding requirement of the multiple-point-position and multi-specification studs of workpieces is met, and the welding efficiency is improved. The welding efficiency of the all-in-one machine is remarkably improved, nearby gun replacement of the mechanical arm can be achieved, the gun replacement work can be completed nearby a workpiece, the gun replacement time of the mechanical arm is greatly shortened, and unnecessary actions of return stroke gun replacement of the mechanical arm are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of welding equipment, and in particular relates to an integrated multi-point stud welding machine. Background Art

[0002] Multi-point stud welding is an efficient and reliable metal joining process widely used in automotive manufacturing, aerospace, rail transportation, engineering machinery and other fields. Its core principle is to melt the contact surface of the stud and the workpiece through arc or resistance heating, forming a metallurgical bond under the action of pressure, and realizing the rapid welding of multiple studs at preset positions on the workpiece.

[0003] Existing multi-point stud welding machines are usually composed of a welding robot arm, a welding gun, a gun-changing mechanism, and a welding platform. The welding robot arm is responsible for moving the welding gun in three-dimensional space to reach different welding points on the workpiece. The welding gun, as an actuator, selects the appropriate type (such as drawn arc type or energy storage type) according to parameters such as the stud diameter and material. The gun-changing mechanism is used to replace the corresponding welding gun when welding studs of different specifications to meet diverse welding needs.

[0004] However, there are still technical defects in its actual application: First, the gun changing process of the existing all-in-one machine needs to rely on the robotic arm to return to the fixed gun changing station to complete. During this process, the robotic arm needs to perform a series of actions such as return, gun changing, and then moving to the welding position. This not only increases the gun changing time, but also has a large amount of unnecessary action redundancy, which seriously restricts the improvement of welding efficiency; secondly, the movement and positioning of the welding gun mostly depends on the overall adjustment of the robotic arm. When the welding gun needs to be replaced, the new welding gun needs to be moved back to the welding origin position. The adjustment process takes a long time and is easily affected by the cumulative error of the robotic arm. The welding accuracy is affected, and it is difficult to take into account both positioning efficiency and accuracy.

[0005] Therefore, in view of the above situation, there is an urgent need to develop a multi-point stud welding all-in-one machine to overcome the shortcomings in current practical applications. Summary of the Invention

[0006] In view of the deficiencies in the prior art, an embodiment of the present invention aims to provide an integrated multi-point stud welding machine to solve the problems in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A multi-point stud welding machine includes a welding robot arm, the welding robot arm is mounted on one side of a welding table, a connecting sleeve is mounted on the tail end of the welding robot arm, the connecting sleeve is concentric with and fixedly connected to a welding frame, a plurality of welding guns for different welding requirements are equidistantly distributed circumferentially on the bottom of the welding frame, and an assembly mechanism is equidistantly distributed circumferentially on the upper surface of the welding frame, and further includes:

[0009] A changing mechanism, wherein the changing mechanism is fixed at an equidistant circumferential distance to the bottom of the welding frame, the changing mechanism comprises a changing frame and a sliding assembly, the changing frame consists of a left Z-shaped frame, a right Z-shaped frame and a U-shaped frame, the left Z-shaped frame is fixed to the bottom of the welding frame, the right Z-shaped frame is fixed to one side of the left Z-shaped frame, and the end surfaces of the right Z-shaped frame and the left Z-shaped frame close to each other are both provided with Z-shaped slide grooves, the bottom of the right Z-shaped frame is fixedly connected to the bottom of the left Z-shaped frame through the U-shaped frame, the sliding assembly is located between the right Z-shaped frame and the left Z-shaped frame and slidably cooperates with the Z-shaped slide groove, the bottom of the sliding assembly is installed with a fixed frame, and a welding gun is installed on the fixed frame;

[0010] A limiting mechanism, which is installed at the bottom of the welding frame and located inside the multiple exchange mechanisms, and is vertically slidably engaged with one end of the sliding assembly;

[0011] A regulating mechanism, one end of which is mounted on a welding frame, the other end of which is located outside a plurality of exchange mechanisms and the welding frame, the inner wall of the other end of the regulating mechanism being in horizontal sliding cooperation with the assembly mechanism, and the bottom of the regulating mechanism being in sliding contact with a plurality of sliding components.

[0012] As a further technical solution of the present invention, the vertical distance between the bottom of the exchange rack and the bottom of the limiting mechanism is smaller than the vertical distance between the top of the exchange rack and the top of the limiting mechanism.

[0013] As a further technical solution of the present invention, the width of the gap between the right Z-shaped frame and the left Z-shaped frame is consistent with the width between the inner walls on both sides of the U-shaped frame, and the width of the gap between the right Z-shaped frame and the left Z-shaped frame is greater than the outer width of the welding gun.

[0014] As a further technical solution of the present invention, the sliding assembly includes a slide, a pulley and a ball bearing. The slide is located between the right Z-shaped frame and the left Z-shaped frame. Pullies are rotatably installed on both sides of the slide. The two pulleys are respectively slidably engaged with the Z-shaped slide grooves on the right Z-shaped frame and the left Z-shaped frame. One end of the slide is vertically slidably engaged with the limiting mechanism, and the upper surface of the other end of the slide is distributed with balls that slidably engage with the regulating mechanism.

[0015] As a further technical solution of the present invention, the regulating mechanism includes a rotating sleeve, a regulating protrusion, a groove, an internal gear, a driving gear and a regulating motor. The rotating sleeve is located on the outside of the welding frame and multiple replacement mechanisms. The inner wall of one end of the rotating sleeve is provided with grooves that horizontally slide with the assembly mechanism. An internal gear is also fixed on the inner wall of one end of the rotating sleeve. The internal gear is engaged with the driving gear fixed on the output end of the regulating motor. The regulating motor is fixed on the welding frame. A regulating protrusion is provided at the bottom of the rotating sleeve. The regulating protrusion is fixed to the bottom of the rotating sleeve in a single distribution state. The regulating protrusion and the bottom of the rotating sleeve are staggered and slidably matched with the ball bearings on multiple slides.

[0016] As a further technical solution of the present invention, the limiting mechanism includes a limiting column, a limiting slider, a connecting assembly and a return spring. The limiting column is vertically fixed to the bottom of the welding frame and is concentric with the welding frame. Linear slide grooves are circumferentially equidistantly distributed on the outer wall of the limiting column. The limiting slider is vertically slidably installed in the linear slide groove. A connecting assembly connected to one end of the slide is fixed on one side of the limiting slider, and a return spring connected to the bottom of the welding frame is installed on the top of the limiting slider.

[0017] As a further technical solution of the present invention, the connecting assembly includes a main slide, a secondary slide and a connecting slide. The main slide is horizontally fixed on one side of the limit slide. The secondary slide is horizontally slidably installed on one end of the main slide. The connecting slide is horizontally fixed on one end of the slide seat. One end of the connecting slide is horizontally slidably connected to the inner wall of the secondary slide.

[0018] As a further technical solution of the present invention, the assembly mechanism includes an assembly seat, an assembly rod, a connecting frame, a sliding ball, a pitch-adjusting screw and a collar. The assembly seat is circumferentially equidistantly installed on the top of the welding frame. The assembly rods are horizontally symmetrically installed on the assembly seat. The two assembly rods are horizontally slidably arranged on the assembly seat. One end of the two assembly rods is fixed with a sliding ball that slides with the groove, and the other end of the two assembly rods is fixedly connected to the connecting frame. The pitch-adjusting screw is horizontally arranged between the two assembly rods and is threadedly connected to the assembly seat. The tail end of the pitch-adjusting screw is fixed with a collar that is movably connected to the middle part of the connecting frame.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The control mechanism can drive multiple sliding components to move vertically in an staggered manner by rotating, that is, one sliding component is located at the bottom of the right Z-frame and the left Z-frame above it, and the other sliding components are all located at the top of their respective right Z-frames and left Z-frames. The multiple sliding components can drive the welding guns on them to move down in an staggered manner to the center point position at the bottom of the welding frame (the welding origin position of the welding all-in-one machine) by cooperating with the limiting mechanism and the welding frame, thereby forming a staggered state in which a single welding gun is working and multiple welding guns are on standby. In this way, not only can the welding guns with different welding requirements be quickly moved down to the welding origin position, and different studs can be quickly welded, and the continuous welding requirements of multiple points and multiple specifications of studs on the workpiece can be met, which significantly improves the welding efficiency of the all-in-one machine, but also the robot arm can change the gun nearby, so that it can complete the gun changing work near the workpiece, greatly shortening the gun changing time of the robot arm, reducing the unnecessary action of the robot arm returning to change the gun, avoiding the redundant action of traditional equipment returning to the fixed gun changing station to change the gun, and further improving the welding efficiency of the all-in-one machine.

[0021] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a multi-point stud welding integrated machine provided in an embodiment of the present invention.

[0023] Figure 2 for Figure 1 An enlarged view of the middle connecting sleeve and its lower structure.

[0024] Figure 3 for Figure 2 Schematic diagram of the structure of the connecting sleeve, regulating mechanism, changing mechanism, limiting mechanism and welding gun.

[0025] Figure 4 for Figure 2 Schematic diagram of the structure of the exchange mechanism, limit mechanism and welding gun.

[0026] Figure 5 for Figure 3 Structural side view of the central control mechanism.

[0027] Figure 6 for Figure 4 Schematic diagram of the structure with the central welding frame, replacement mechanism, limit mechanism and welding gun partially hidden.

[0028] Figure 7 for Figure 6 Bottom view of the structure.

[0029] Figure 8 for Figure 6 Schematic diagram of the structure of the exchange mechanism and the limit mechanism.

[0030] Figure 9 for Figure 8 Schematic diagram of the structure of the central exchange rack.

[0031] Figure 10 for Figure 8 Schematic diagram of the structure of the sliding component, spring and connecting component.

[0032] Figure 11 for Figure 10 Schematic diagram of the structure of the connected components.

[0033] Figure 12 for Figure 4 Schematic diagram of the structure of the assembly mechanism.

[0034] Reference numerals: 100 - welding robot arm, 200 - connecting sleeve, 300 - regulating mechanism, 310 - rotating sleeve, 320 - regulating protrusion, 330 - groove, 340 - internal gear, 350 - driving gear, 360 - regulating motor, 400 - switching mechanism, 410 - switching frame, 411 - left Z-shaped frame, 412 - right Z-shaped frame, 413 - U-shaped frame, 414 - Z-shaped slide, 420 - sliding assembly, 421 - slide seat, 422 - pulley, 42 3-ball, 500-limiting mechanism, 510-limiting column, 511-linear slide, 520-limiting slider, 530-connecting assembly, 531-main slide, 532-auxiliary slide, 533-connecting slide column, 540-return spring, 600-welding gun, 610-fixed bracket, 700-welding frame, 800-assembly mechanism, 810-assembly seat, 820-assembly rod, 830-connecting frame, 840-sliding ball, 850-pitch adjusting screw, 860-ring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0037] like Figures 1 to 12As shown, as an embodiment of the present invention, a multi-point stud welding integrated machine is provided, including a welding robot arm 100, which is installed on one side or the middle of the welding table to ensure that the welding area of ​​the workpiece on the welding table is within the adjustment range of the welding robot arm 100. A connecting sleeve 200 is installed at the tail end of the welding robot arm 100, and the connecting sleeve 200 is concentric with and fixedly connected to the welding frame 700. The bottom of the welding frame 700 is circumferentially and evenly distributed with welding guns 600 for different stud welding requirements. The upper surface of the welding frame 700 is circumferentially and evenly distributed with an assembly mechanism 800. It also includes:

[0038] The switching mechanism 400 is fixed at an equal distance in the circumferential direction at the bottom of the welding frame 700. The switching mechanism 400 includes a switching frame 410 and a sliding assembly 420. The switching frame 410 is composed of a left Z-shaped frame 411, a right Z-shaped frame 412 and a U-shaped frame 413. The left Z-shaped frame 411 is fixed to the bottom of the welding frame 700, the right Z-shaped frame 412 is fixed to one side of the left Z-shaped frame 411, and the right Z-shaped frame 413 is fixed to the left Z-shaped frame 411. 2 and the left Z-shaped frame 411 are provided with a Z-shaped groove 414 on the end surfaces thereof close to each other. The bottom of the right Z-shaped frame 412 is fixedly connected to the bottom of the left Z-shaped frame 411 via a U-shaped frame 413. The sliding assembly 420 is located between the right Z-shaped frame 412 and the left Z-shaped frame 411 and slidably cooperates with the Z-shaped groove 414. A fixing frame 610 is installed at the bottom of the sliding assembly 420, and a welding gun 600 is installed on the fixing frame 610.

[0039] A limiting mechanism 500 is installed at the bottom of the welding frame 700 and is located inside the multiple exchange mechanisms 400. The limiting mechanism 500 is vertically slidably engaged with one end of the sliding assembly 420;

[0040] A regulating mechanism 300, one end of which is mounted on the welding frame 700, and the other end of which is located outside the multiple exchange mechanisms 400 and the welding frame 700. The inner wall of the other end of the regulating mechanism 300 is in horizontal sliding engagement with the assembly mechanism 800, and the bottom of the regulating mechanism 300 is in sliding contact with the multiple sliding assemblies 420;

[0041] The assembly mechanism 800 can fix the regulating mechanism 300 stably outside the welding frame 700 and enable it to rotate around the axis of the welding frame 700. The regulating mechanism 300 can drive the multiple sliding assemblies 420 to move vertically in an interleaved manner by rotating, i.e., one sliding assembly 420 is located at the bottom of the right Z-shaped frame 412 and the left Z-shaped frame 411, and the other sliding assemblies 420 are located at the top of the respective right Z-shaped frame 412 and the left Z-shaped frame 411. The multiple sliding assemblies 420 can drive the respective welding guns 600 to move downward to the center point position (the welding origin position of the welding integrated machine) at the bottom of the welding frame 700 in an interleaved manner by cooperating with the limiting mechanism 500 and the welding frame 700, thereby forming an interleaved state of single welding gun 600 working and multiple welding guns 600 on standby. This not only enables the welding guns 600 with different welding requirements to be quickly moved downward to the welding origin position to realize rapid welding of different studs and meet the continuous welding requirements of multiple point positions and multiple specifications of studs on a workpiece, but also significantly improves the welding efficiency of the integrated machine. In addition, it can realize the nearby gun changing of the mechanical arm, so that the gun changing work can be completed near the workpiece, greatly shortening the gun changing time of the mechanical arm, reducing unnecessary actions of the mechanical arm returning to change the gun, avoiding the action redundancy of the traditional equipment returning to the fixed gun changing station to change the gun, and further improving the welding efficiency of the integrated machine.

[0042] In a preferred embodiment, the types of the welding guns 600 can be adaptively adjusted according to the diameter, material, and position of the workpiece to meet the rapid welding requirements of multiple point studs on the workpiece.

[0043] The vertical distance between the bottom of the regulating mechanism 500 and the bottom of the regulating frame 410 is less than the vertical distance between the top of the regulating mechanism 500 and the top of the regulating frame 410, which ensures that the welding head of the welding gun 600 can move horizontally from the welding origin to the outside during the upward movement of the welding gun 600, avoids collision between the welding gun 600 and the limiting mechanism 500 during the upward movement of the welding gun 600, and prolongs the service life of the welding gun 600.

[0044] The width of the gap between the right Z-shaped frame 412 and the left Z-shaped frame 411 is consistent with the width between the two inner walls of the U-shaped frame 413, and the width of the gap between the right Z-shaped frame 412 and the left Z-shaped frame 411 is greater than the outer width of the welding gun 600, which ensures that the welding gun 600 only enters the gap between the right Z-shaped frame 412 and the left Z-shaped frame 411 during the upward movement, avoids collision between the welding gun 600 and the right Z-shaped frame 412 and the left Z-shaped frame 411, and prolongs the service life of the welding gun 600.

[0045] The welding gun 600 includes a pull arc welding gun 600 and an energy storage welding gun 600, both of which have different discharge powers to meet the welding requirements of different specifications and different point columnar, and the welding gun 600 can adopt a bent pipe or a short pipe style.

[0046] As shown in Figures 2 to 10 As shown in FIG. 6, as a preferred embodiment of the present application, the sliding assembly 420 includes a sliding seat 421, a pulley 422 and a ball 423, the sliding seat 421 is located between the right Z-shaped frame 412 and the left Z-shaped frame 411, both sides of the sliding seat 421 are rotatably installed with the pulley 422, the two pulleys 422 are respectively in sliding cooperation with the Z-shaped sliding groove 414 on the right Z-shaped frame 412 and the left Z-shaped frame 411, one end of the sliding seat 421 is in vertical sliding cooperation with the limiting mechanism 500, and the upper surface of the other end of the sliding seat 421 is distributed with the ball 423 in sliding cooperation with the regulating mechanism 300.

[0047] The regulating mechanism 300 can drive the sliding seat 421 on the multiple exchange frames 410 to move vertically by rotating and sliding cooperation with the ball 423, that is, one sliding seat 421 is located at the bottom of the right Z-shaped frame 412 and the left Z-shaped frame 411, and the other sliding seats 421 are located at the top of the right Z-shaped frame 412 and the left Z-shaped frame 411, and the multiple sliding seats 421 can drive the respective welding guns 600 to move downward to the center point position (the welding origin of the welding machine) at the bottom of the welding frame 700 by cooperating with the limiting mechanism 500 and the welding frame 700, so as to form the staggered state of single welding gun 600 working and multiple welding guns 600 on standby, meet the continuous welding requirements of multiple point positions and multiple specifications of the workpiece, and greatly shorten the welding time, significantly improve the welding efficiency and welding quality of the machine.

[0048] In a preferred embodiment, the sliding seat 421 preferably adopts a square block structure.

[0049] As shown in Figures 2 to 10As shown, as a preferred embodiment of the present invention, the regulating mechanism 300 includes a rotating sleeve 310, a regulating protrusion 320, a groove 330, an internal gear 340, a driving gear 350 and a regulating motor 360. The rotating sleeve 310 is located outside the welding frame 700 and multiple exchange mechanisms 400. The inner wall of one end of the rotating sleeve 310 is provided with a groove 330 that horizontally slides with the assembly mechanism 800. The inner wall of one end of the rotating sleeve 310 is also fixed with an internal gear 340. The internal gear 340 is engaged with the driving gear 350 fixed on the output end of the regulating motor 360. The regulating motor 360 is fixed on the welding frame 700. The bottom of the rotating sleeve 310 is provided with a regulating protrusion 320. The regulating protrusion 320 is fixed to the bottom of the rotating sleeve 310 in a single distribution state. The regulating protrusion 320 and the bottom of the rotating sleeve 310 are staggered and slidably matched with the balls 423 on multiple slides 421.

[0050] The assembly mechanism 800 cooperates with the groove 330 to stably mount the rotating sleeve 310 on the outside of the welding frame 700 and ensure that it can rotate in a circular motion around the axis of the welding frame 700. The control motor 360 controls the rotation of the drive gear 350. The drive gear 350 drives the rotating sleeve 310 to rotate on the assembly mechanism 800 via the internal gear 340. The rotating sleeve 310 drives the control protrusion 320 to rotate synchronously. The control protrusion 320 rotates synchronously with the rotating sleeve 310 to slide with the slide seats 421 distributed at different positions.

[0051] When the regulating protrusion 320 is in sliding engagement with the slide 421, it can drive the slide 421 to move vertically along the layout trajectory of the right Z-shaped frame 412 and the left Z-shaped frame 411 by cooperating with the pulley 422 and the Z-shaped slide 414, thereby completing the designated exchange of the single welding gun 600, so that the welding gun 600 can be quickly moved down to the welding origin position, realizing rapid and continuous welding of the designated stud, meeting the continuous welding requirements of multi-point positions and multi-specification studs of the workpiece, and significantly improving the welding efficiency of the all-in-one machine;

[0052] The slide 421 that slides with the bottom of the rotating sleeve 310 can quickly rise to the bottom of the right Z-shaped frame 412 and the left Z-shaped frame 411 under the elastic control of the limiting mechanism 500 and be located on the outside of the limiting mechanism 500, thereby realizing the working mode of the integrated machine with a single welding gun 600 working and multiple welding guns 600 on standby.

[0053] In a preferred embodiment, the positions of the non-regulating protrusions 320 on the bottom of the rotating sleeve 310 are all smooth end surfaces and are at the same height. This ensures that the multiple slides 421 that slide with this position can be at the same height, so that the multiple welding guns 600 in the standby state are all at the same height.

[0054] like Figures 2 to 11 As shown, as a preferred embodiment of the present invention, the limiting mechanism 500 includes a limiting column 510, a limiting slider 520, a connecting assembly 530 and a return spring 540. The limiting column 510 is vertically fixed to the bottom of the welding frame 700 and is concentric with the welding frame 700. The outer wall of the limiting column 510 is circumferentially equidistantly distributed with linear slide grooves 511. The limiting slider 520 is vertically slidably installed in the linear slide groove 511. A connecting assembly 530 connected to one end of the slide 421 is fixed on one side of the limiting slider 520. A return spring 540 connected to the bottom of the welding frame 700 is installed on the top of the limiting slider 520.

[0055] The connecting assembly 530 includes a main slide 531, a secondary slide 532 and a connecting slide 533. The main slide 531 is horizontally fixed on one side of the limiting slider 520. The secondary slide 532 is horizontally slidably installed on one end of the main slide 531. The connecting slide 533 is horizontally fixed on one end of the slide seat 421. One end of the connecting slide 533 is horizontally slidably connected to the inner wall of the secondary slide 532.

[0056] The connecting assembly 530, by cooperating with the limiting column 510, the limiting slider 520, and the linear slide 511, can limit the rotation direction of the slide 421, so that it always moves horizontally along the layout trajectory of the right Z-shaped frame 412 and the left Z-shaped frame 411, thereby ensuring that the welding gun 600 always moves horizontally during the position change process, further ensuring that the welding head of the welding gun 600 can accurately reach the welding origin position, reducing its adjustment time, and improving the welding quality and welding efficiency of the all-in-one machine for the workpiece studs;

[0057] When the slider 421 is separated from the regulating protrusion 320, the return spring 540 can drive the limiting slider 520 to move upward through its own elastic force, and the limiting slider 520 drives the slider 421 to move upward through the connecting assembly 530, so that the slider 421 is always in contact with the regulating protrusion 320 or the bottom of the rotating sleeve 310, thereby ensuring that the welding gun 600 on the slider 421 can move up and down, thereby completing the single welding gun 600 working and multi-welding gun 600 standby working mode of the all-in-one machine, meeting the welding requirements of multi-point and multi-specification studs of the workpiece, and improving the practicality and applicability of the all-in-one machine.

[0058] like Figure 4 、 Figure 5 and Figure 12 As shown, as a preferred embodiment of the present invention, the assembly mechanism 800 includes an assembly seat 810, an assembly rod 820, a connecting frame 830, a sliding ball 840, a pitch-adjusting screw 850 and a collar 860. The assembly seat 810 is circumferentially equidistantly installed on the top of the welding frame 700. The assembly rods 820 are horizontally symmetrically installed on the assembly seat 810. The two assembly rods 820 are horizontally slidably arranged on the assembly seat 810. One end of the two assembly rods 820 is fixed with a sliding ball 840 that slides with the groove 330, and the other end of the two assembly rods 820 is fixedly connected to the connecting frame 830. The pitch-adjusting screw 850 is horizontally arranged between the two assembly rods 820 and is threadedly connected to the assembly seat 810. The tail end of the pitch-adjusting screw 850 is fixed with a collar 860 that is movably connected to the middle part of the connecting frame 830.

[0059] The pitch-adjusting screw 850 can drive the collar 860 to rotate synchronously and move horizontally by rotating on the assembly seat 810. The collar 860 drives the connecting frame 830 to move horizontally. The connecting frame 830 drives the two assembly rods 820 to move horizontally synchronously. The two assembly rods 820 drive their respective sliding balls 840 to move horizontally. The slider can release or restore the matching state with the groove 330 by moving horizontally, thereby completing the rapid disassembly and assembly of the rotating sleeve 310. By synchronously controlling the number of rotations of multiple pitch-adjusting screws 850, it can be ensured that the rotating sleeve 310 is concentric with the welding frame 700, thereby ensuring that it can effectively and fully drive multiple slides 421 to work, effectively completing the single welding gun 600 working and multi-welding gun 600 standby working mode of the all-in-one machine, meeting the welding requirements of multi-point and multi-specification studs of the workpiece, and improving the practicality and applicability of the all-in-one machine.

[0060] In a preferred embodiment, the pitch-adjusting screw 850 can also be replaced with an electrically controlled, pneumatically controlled or hydraulically controlled component. For example, the pitch-adjusting screw 850 can be replaced with a pneumatic telescopic cylinder. The control program set on the all-in-one machine can be used to synchronously control multiple pneumatic telescopic cylinders so that they output equal moving strokes, thereby completing the concentric fixation of the rotating sleeve 310.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-point stud welding machine, comprising a welding robot arm, the welding robot arm being mounted on one side of a welding table, a connecting sleeve being mounted on the tail end of the welding robot arm, the connecting sleeve being concentric with and fixedly connected to a welding frame, a plurality of welding guns for different welding requirements being equidistantly distributed circumferentially on the bottom of the welding frame, and an assembly mechanism being equidistantly distributed circumferentially on the upper surface of the welding frame, characterized in that: Also includes: A changing mechanism, wherein the changing mechanism is fixed at an equidistant circumferential distance to the bottom of the welding frame, the changing mechanism comprises a changing frame and a sliding assembly, the changing frame consists of a left Z-shaped frame, a right Z-shaped frame and a U-shaped frame, the left Z-shaped frame is fixed to the bottom of the welding frame, the right Z-shaped frame is fixed to one side of the left Z-shaped frame, and the end surfaces of the right Z-shaped frame and the left Z-shaped frame close to each other are both provided with Z-shaped slide grooves, the bottom of the right Z-shaped frame is fixedly connected to the bottom of the left Z-shaped frame through the U-shaped frame, the sliding assembly is located between the right Z-shaped frame and the left Z-shaped frame and slidably cooperates with the Z-shaped slide groove, the bottom of the sliding assembly is installed with a fixed frame, and a welding gun is installed on the fixed frame; A limiting mechanism, which is installed at the bottom of the welding frame and located inside the multiple exchange mechanisms, and is vertically slidably engaged with one end of the sliding assembly; A regulating mechanism, one end of which is mounted on a welding frame, the other end of which is located outside a plurality of exchange mechanisms and the welding frame, the inner wall of the other end of the regulating mechanism being in horizontal sliding cooperation with the assembly mechanism, and the bottom of the regulating mechanism being in sliding contact with a plurality of sliding components.

2. The multi-point stud welding integrated machine according to claim 1, characterized in that: The vertical distance between the bottom of the exchange rack and the bottom of the limiting mechanism is smaller than the vertical distance between the top of the exchange rack and the top of the limiting mechanism.

3. The multi-point stud welding integrated machine according to claim 1, characterized in that: The width of the gap between the right Z-shaped frame and the left Z-shaped frame is consistent with the width between the inner walls on both sides of the U-shaped frame, and the width of the gap between the right Z-shaped frame and the left Z-shaped frame is greater than the outer width of the welding gun.

4. The multi-point stud welding integrated machine according to claim 1, characterized in that: The sliding assembly includes a slide, a pulley and a ball bearing. The slide is located between the right Z-shaped frame and the left Z-shaped frame. Pulleys are rotatably installed on both sides of the slide. The two pulleys are respectively slidably engaged with the Z-shaped slide grooves on the right Z-shaped frame and the left Z-shaped frame. One end of the slide is vertically slidably engaged with the limiting mechanism, and the upper surface of the other end of the slide is distributed with balls slidably engaged with the regulating mechanism.

5. The multi-point stud welding integrated machine according to claim 4, characterized in that: The regulating mechanism includes a rotating sleeve, a regulating protrusion, a groove, an internal gear, a driving gear and a regulating motor. The rotating sleeve is located on the outside of the welding frame and multiple exchange mechanisms. Grooves that horizontally slide with the assembly mechanism are distributed on the inner wall of one end of the rotating sleeve. An internal gear is also fixed on the inner wall of one end of the rotating sleeve. The internal gear is engaged with the driving gear fixed on the output end of the regulating motor. The regulating motor is fixed on the welding frame. A regulating protrusion is provided at the bottom of the rotating sleeve. The regulating protrusion is fixed to the bottom of the rotating sleeve in a single distribution state. The regulating protrusion and the bottom of the rotating sleeve slide in an alternating manner with the ball bearings on multiple slides.

6. The multi-point stud welding integrated machine according to claim 4, characterized in that: The limiting mechanism includes a limiting column, a limiting slider, a connecting assembly and a return spring. The limiting column is vertically fixed to the bottom of the welding frame and is concentric with the welding frame. Linear slide grooves are circumferentially equidistantly distributed on the outer wall of the limiting column. The limiting slider is vertically slidably installed in the linear slide groove. A connecting assembly connected to one end of the slide is fixed on one side of the limiting slider. A return spring connected to the bottom of the welding frame is installed on the top of the limiting slider.

7. The multi-point stud welding integrated machine according to claim 6, characterized in that: The connecting assembly includes a main slide, a secondary slide and a connecting slide. The main slide is horizontally fixed on one side of the limit slide. The secondary slide is horizontally slidably installed on one end of the main slide. The connecting slide is horizontally fixed on one end of the slide seat. One end of the connecting slide is horizontally slidably connected to the inner wall of the secondary slide.

8. The multi-point stud welding integrated machine according to claim 1, characterized in that: The assembly mechanism includes an assembly seat, an assembly rod, a connecting frame, a sliding ball, a pitch-adjusting screw and a collar. The assembly seat is circumferentially equidistantly installed on the top of the welding frame. The assembly seat is horizontally symmetrically installed with assembly rods. The two assembly rods are horizontally slidably arranged on the assembly seat. One end of the two assembly rods is fixed with a sliding ball that slides with the groove, and the other end of the two assembly rods is fixedly connected to the connecting frame. The pitch-adjusting screw is horizontally arranged between the two assembly rods and is threadedly connected to the assembly seat. The tail end of the pitch-adjusting screw is fixed with a collar that is movably connected to the middle part of the connecting frame.

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